[MOT] unify tracker for single class and multi-class MOT (#4491)

configs/datasets/mcmot.yml

+metric: MCMOT
+num_classes: 10
+# using VisDrone2019 MOT dataset with 10 classes as default, you can modify it for your needs.
+
+# for MCMOT training
+TrainDataset:
+  !MCMOTDataSet
+    dataset_dir: dataset/mot
+    image_lists: ['visdrone_mcmot.train']
+    data_fields: ['image', 'gt_bbox', 'gt_class', 'gt_ide']
+    label_list: label_list.txt
+
+# for MCMOT evaluation
+# If you want to change the MCMOT evaluation dataset, please modify 'data_root'
+EvalMOTDataset:
+  !MOTImageFolder
+    dataset_dir: dataset/mot
+    data_root: visdrone_mcmot/images/val
+    keep_ori_im: False # set True if save visualization images or video, or used in DeepSORT
+
+# for MCMOT video inference
+TestMOTDataset:
+  !MOTImageFolder
+    dataset_dir: dataset/mot
+    keep_ori_im: True # set True if save visualization images or video

configs/mot/fairmot/_base_/fairmot_dla34.yml

@@ -33,7 +33,6 @@ CenterNetHead:
 FairMOTEmbeddingHead:
   ch_head: 256
   ch_emb: 128
-  num_identifiers: 14455 # for mix dataset (Caltech, CityPersons, CUHK-SYSU, PRW, ETHZ and MOT16)
 
 CenterNetPostProcess:
   max_per_img: 500

configs/mot/mcfairmot/README.md

+English | [简体中文](README_cn.md)
+
+# MCFairMOT (Multi-class FairMOT)
+
+## Table of Contents
+- [Introduction](#Introduction)
+- [Model Zoo](#Model_Zoo)
+- [Getting Start](#Getting_Start)
+- [Citations](#Citations)
+
+## Introduction
+
+MCFairMOT is the Multi-class extended version of [FairMOT](https://arxiv.org/abs/2004.01888).
+
+## Model Zoo
+### MCFairMOT DLA-34 Results on VisDrone2019 Val Set
+| backbone       | input shape | MOTA | IDF1 |  IDS    |   FPS    | download | config |
+| :--------------| :------- | :----: | :----: | :---:  | :------: | :----: |:----: |
+| DLA-34         | 1088x608 |  24.3  |  41.6  |  2314  |    -     |[model](https://paddledet.bj.bcebos.com/models/mot/mcfairmot_dla34_30e_1088x608_visdrone.pdparams) | [config](./mcfairmot_dla34_30e_1088x608_visdrone.yml) |
+| HRNetV2-W18    | 1088x608 |  20.4  |  39.9  |  2603  |    -     |[model](https://paddledet.bj.bcebos.com/models/mot/mcfairmot_hrnetv2_w18_dlafpn_30e_1088x608_visdrone.pdparams) | [config](./mcfairmot_hrnetv2_w18_dlafpn_30e_1088x608_visdrone.yml) |
+
+**Notes:**
+ MOTA is the average MOTA of 10 catecories in the VisDrone2019 MOT dataset, and its value is also equal to the average MOTA of all the evaluated video sequences.
+
+
+## Getting Start
+
+### 1. Training
+Training MCFairMOT on 8 GPUs with following command
+```bash
+python -m paddle.distributed.launch --log_dir=./mcfairmot_dla34_30e_1088x608_visdrone/ --gpus 0,1,2,3,4,5,6,7 tools/train.py -c configs/mot/mcfairmot/mcfairmot_dla34_30e_1088x608_visdrone.yml
+```
+
+### 2. Evaluation
+Evaluating the track performance of MCFairMOT on val dataset in single GPU with following commands:
+```bash
+# use weights released in PaddleDetection model zoo
+CUDA_VISIBLE_DEVICES=0 python tools/eval_mot.py -c configs/mot/mcfairmot/mcfairmot_dla34_30e_1088x608_visdrone.yml -o weights=https://paddledet.bj.bcebos.com/models/mot/mcfairmot_dla34_30e_1088x608_visdrone.pdparams
+
+# use saved checkpoint in training
+CUDA_VISIBLE_DEVICES=0 python tools/eval_mot.py -c configs/mot/mcfairmot/mcfairmot_dla34_30e_1088x608_visdrone.yml -o weights=output/mcfairmot_dla34_30e_1088x608_visdrone/model_final.pdparams
+```
+**Notes:**
+ The default evaluation dataset is VisDrone2019 MOT val-set. If you want to change the evaluation dataset, please refer to the following code and modify `configs/datasets/mcmot.yml`：
+```
+EvalMOTDataset:
+  !MOTImageFolder
+    dataset_dir: dataset/mot
+    data_root: your_dataset/images/val
+    keep_ori_im: False # set True if save visualization images or video
+```
+
+### 3. Inference
+Inference a vidoe on single GPU with following command:
+```bash
+# inference on video and save a video
+CUDA_VISIBLE_DEVICES=0 python tools/infer_mot.py -c configs/mot/mcfairmot/mcfairmot_dla34_30e_1088x608_visdrone.yml -o weights=https://paddledet.bj.bcebos.com/models/mot/mcfairmot_dla34_30e_1088x608_visdrone.pdparams --video_file={your video name}.mp4  --save_videos
+```
+**Notes:**
+ Please make sure that [ffmpeg](https://ffmpeg.org/ffmpeg.html) is installed first, on Linux(Ubuntu) platform you can directly install it by the following command:`apt-get update && apt-get install -y ffmpeg`.
+
+
+### 4. Export model
+```bash
+CUDA_VISIBLE_DEVICES=0 python tools/export_model.py -c configs/mot/mcfairmot/mcfairmot_dla34_30e_1088x608_visdrone.yml -o weights=https://paddledet.bj.bcebos.com/models/mot/mcfairmot_dla34_30e_1088x608_visdrone.pdparams
+```
+
+### 5. Using exported model for python inference
+```bash
+python deploy/python/mot_jde_infer.py --model_dir=output_inference/mcfairmot_dla34_30e_1088x608_visdrone --video_file={your video name}.mp4 --device=GPU --save_mot_txts
+```
+**Notes:**
+The tracking model is used to predict the video, and does not support the prediction of a single image. The visualization video of the tracking results is saved by default. You can add `--save_mot_txts` to save the txt result file, or `--save_images` to save the visualization images.
+
+
+## Citations
+```
+@article{zhang2020fair,
+  title={FairMOT: On the Fairness of Detection and Re-Identification in Multiple Object Tracking},
+  author={Zhang, Yifu and Wang, Chunyu and Wang, Xinggang and Zeng, Wenjun and Liu, Wenyu},
+  journal={arXiv preprint arXiv:2004.01888},
+  year={2020}
+}
+
+@ARTICLE{9573394,
+  author={Zhu, Pengfei and Wen, Longyin and Du, Dawei and Bian, Xiao and Fan, Heng and Hu, Qinghua and Ling, Haibin},
+  journal={IEEE Transactions on Pattern Analysis and Machine Intelligence}, 
+  title={Detection and Tracking Meet Drones Challenge}, 
+  year={2021},
+  volume={},
+  number={},
+  pages={1-1},
+  doi={10.1109/TPAMI.2021.3119563}
+}
+```

configs/mot/mcfairmot/README_cn.md

+简体中文 | [English](README.md)
+
+# MCFairMOT (Multi-class FairMOT)
+
+## 内容
+- [简介](#简介)
+- [模型库](#模型库)
+- [快速开始](#快速开始)
+- [引用](#引用)
+
+## 内容
+
+MCFairMOT是[FairMOT](https://arxiv.org/abs/2004.01888)的多类别扩展版本。
+
+## 模型库
+
+### MCFairMOT DLA-34 在VisDrone2019 MOT val-set上结果
+|    骨干网络      |  输入尺寸 |  MOTA  |  IDF1  |  IDS   |   FPS   |  下载链接 | 配置文件 |
+| :--------------| :------- | :----: | :----: | :---:  | :------: | :----: |:----: |
+| DLA-34         | 1088x608 |  24.3  |  41.6  |  2314  |    -     |[下载链接](https://paddledet.bj.bcebos.com/models/mot/mcfairmot_dla34_30e_1088x608_visdrone.pdparams) | [配置文件](./mcfairmot_dla34_30e_1088x608_visdrone.yml) |
+| HRNetV2-W18    | 1088x608 |  20.4  |  39.9  |  2603  |    -     |[下载链接](https://paddledet.bj.bcebos.com/models/mot/mcfairmot_hrnetv2_w18_dlafpn_30e_1088x608_visdrone.pdparams) | [配置文件](./mcfairmot_hrnetv2_w18_dlafpn_30e_1088x608_visdrone.yml) |
+
+**注意:**
+ MOTA是VisDrone2019 MOT数据集10类目标的平均MOTA, 其值也等于所有评估的视频序列的平均MOTA。
+
+## 快速开始
+
+### 1. 训练
+使用8个GPU通过如下命令一键式启动训练
+```bash
+python -m paddle.distributed.launch --log_dir=./mcfairmot_dla34_30e_1088x608_visdrone/ --gpus 0,1,2,3,4,5,6,7 tools/train.py -c configs/mot/mcfairmot/mcfairmot_dla34_30e_1088x608_visdrone.yml
+```
+
+### 2. 评估
+使用单张GPU通过如下命令一键式启动评估
+```bash
+# 使用PaddleDetection发布的权重
+CUDA_VISIBLE_DEVICES=0 python tools/eval_mot.py -c configs/mot/mcfairmot/mcfairmot_dla34_30e_1088x608_visdrone.yml -o weights=https://paddledet.bj.bcebos.com/models/mot/mcfairmot_dla34_30e_1088x608_visdrone.pdparams
+
+# 使用训练保存的checkpoint
+CUDA_VISIBLE_DEVICES=0 python tools/eval_mot.py -c configs/mot/mcfairmot/mcfairmot_dla34_30e_1088x608_visdrone.yml -o weights=output/mcfairmot_dla34_30e_1088x608_visdrone/model_final.pdparams
+```
+**注意:**
+ 默认评估的是VisDrone2019 MOT val-set数据集, 如需换评估数据集可参照以下代码修改`configs/datasets/mcmot.yml`：
+```
+EvalMOTDataset:
+  !MOTImageFolder
+    dataset_dir: dataset/mot
+    data_root: your_dataset/images/val
+    keep_ori_im: False # set True if save visualization images or video
+```
+
+### 3. 预测
+使用单个GPU通过如下命令预测一个视频，并保存为视频
+```bash
+# 预测一个视频
+CUDA_VISIBLE_DEVICES=0 python tools/infer_mot.py -c configs/mot/mcfairmot/mcfairmot_dla34_30e_1088x608_visdrone.yml -o weights=https://paddledet.bj.bcebos.com/models/mot/mcfairmot_dla34_30e_1088x608_visdrone.pdparams --video_file={your video name}.mp4  --save_videos
+```
+**注意:**
+ 请先确保已经安装了[ffmpeg](https://ffmpeg.org/ffmpeg.html), Linux(Ubuntu)平台可以直接用以下命令安装：`apt-get update && apt-get install -y ffmpeg`。
+
+### 4. 导出预测模型
+```bash
+CUDA_VISIBLE_DEVICES=0 python tools/export_model.py -c configs/mot/mcfairmot/mcfairmot_dla34_30e_1088x608_visdrone.yml -o weights=https://paddledet.bj.bcebos.com/models/mot/mcfairmot_dla34_30e_1088x608_visdrone.pdparams
+```
+
+### 5. 用导出的模型基于Python去预测
+```bash
+python deploy/python/mot_jde_infer.py --model_dir=output_inference/mcfairmot_dla34_30e_1088x608_visdrone --video_file={your video name}.mp4 --device=GPU --save_mot_txts
+```
+**注意:**
+ 跟踪模型是对视频进行预测，不支持单张图的预测，默认保存跟踪结果可视化后的视频，可添加`--save_mot_txts`表示保存跟踪结果的txt文件，或`--save_images`表示保存跟踪结果可视化图片。
+
+
+## 引用
+```
+@article{zhang2020fair,
+  title={FairMOT: On the Fairness of Detection and Re-Identification in Multiple Object Tracking},
+  author={Zhang, Yifu and Wang, Chunyu and Wang, Xinggang and Zeng, Wenjun and Liu, Wenyu},
+  journal={arXiv preprint arXiv:2004.01888},
+  year={2020}
+}
+
+@ARTICLE{9573394,
+  author={Zhu, Pengfei and Wen, Longyin and Du, Dawei and Bian, Xiao and Fan, Heng and Hu, Qinghua and Ling, Haibin},
+  journal={IEEE Transactions on Pattern Analysis and Machine Intelligence}, 
+  title={Detection and Tracking Meet Drones Challenge}, 
+  year={2021},
+  volume={},
+  number={},
+  pages={1-1},
+  doi={10.1109/TPAMI.2021.3119563}
+}
+```

configs/mot/mcfairmot/mcfairmot_dla34_30e_1088x608_visdrone.yml

+_BASE_: [
+  '../fairmot/fairmot_dla34_30e_1088x608.yml',
+  '../../datasets/mcmot.yml'
+]
+
+pretrain_weights: https://paddledet.bj.bcebos.com/models/pretrained/fairmot_dla34_crowdhuman_pretrained.pdparams
+
+FairMOT:
+  detector: CenterNet
+  reid: FairMOTEmbeddingHead
+  loss: FairMOTLoss
+  tracker: JDETracker # multi-class tracker
+
+CenterNetHead:
+  regress_ltrb: False
+
+CenterNetPostProcess:
+  for_mot: True
+  regress_ltrb: False
+  max_per_img: 200
+
+JDETracker:
+  min_box_area: 0
+  vertical_ratio: 0 # no need to filter bboxes according to w/h
+  conf_thres: 0.4
+  tracked_thresh: 0.4
+  metric_type: cosine
+
+weights: output/mcfairmot_dla34_30e_1088x608_visdrone/model_final
+
+epoch: 30
+LearningRate:
+  base_lr: 0.0005
+  schedulers:
+  - !PiecewiseDecay
+    gamma: 0.1
+    milestones: [10, 20]
+    use_warmup: False
+
+OptimizerBuilder:
+  optimizer:
+    type: Adam
+  regularizer: NULL

configs/mot/mcfairmot/mcfairmot_hrnetv2_w18_dlafpn_30e_1088x608_visdrone.yml

+_BASE_: [
+  '../fairmot/fairmot_hrnetv2_w18_dlafpn_30e_1088x608.yml',
+  '../../datasets/mcmot.yml'
+]
+
+architecture: FairMOT
+pretrain_weights: https://paddledet.bj.bcebos.com/models/pretrained/HRNet_W18_C_pretrained.pdparams
+for_mot: True
+
+FairMOT:
+  detector: CenterNet
+  reid: FairMOTEmbeddingHead
+  loss: FairMOTLoss
+  tracker: JDETracker # multi-class tracker
+
+CenterNetHead:
+  regress_ltrb: False
+
+CenterNetPostProcess:
+  regress_ltrb: False
+  max_per_img: 200
+
+JDETracker:
+  min_box_area: 0
+  vertical_ratio: 0 # no need to filter bboxes according to w/h
+  conf_thres: 0.4
+  tracked_thresh: 0.4
+  metric_type: cosine
+
+weights: output/mcfairmot_hrnetv2_w18_dlafpn_30e_1088x608_visdrone/model_final
+
+epoch: 30
+LearningRate:
+  base_lr: 0.0005
+  schedulers:
+  - !PiecewiseDecay
+    gamma: 0.1
+    milestones: [10, 20]
+    use_warmup: False
+
+OptimizerBuilder:
+  optimizer:
+    type: Adam
+  regularizer: NULL
+
+TrainReader:
+  batch_size: 8

deploy/python/mot_jde_infer.py

@@ -17,18 +17,20 @@ import time
 import yaml
 import cv2
 import numpy as np
-import paddle
-from benchmark_utils import PaddleInferBenchmark
-from preprocess import preprocess
-
-from tracker import JDETracker
-from ppdet.modeling.mot import visualization as mot_vis
-from ppdet.modeling.mot.utils import Timer as MOTTimer
+from collections import defaultdict
 
+import paddle
 from paddle.inference import Config
 from paddle.inference import create_predictor
+
+from preprocess import preprocess
 from utils import argsparser, Timer, get_current_memory_mb
 from infer import Detector, get_test_images, print_arguments, PredictConfig
+from benchmark_utils import PaddleInferBenchmark
+
+from ppdet.modeling.mot.tracker import JDETracker
+from ppdet.modeling.mot.visualization import plot_tracking_dict
+from ppdet.modeling.mot.utils import MOTTimer, write_mot_results
 
 # Global dictionary
 MOT_SUPPORT_MODELS = {
@@ -80,13 +82,17 @@ class JDE_Detector(Detector):
             enable_mkldnn=enable_mkldnn)
         assert batch_size == 1, "The JDE Detector only supports batch size=1 now"
         assert pred_config.tracker, "Tracking model should have tracker"
+        self.num_classes = len(pred_config.labels)
+
         tp = pred_config.tracker
         min_box_area = tp['min_box_area'] if 'min_box_area' in tp else 200
         vertical_ratio = tp['vertical_ratio'] if 'vertical_ratio' in tp else 1.6
         conf_thres = tp['conf_thres'] if 'conf_thres' in tp else 0.
         tracked_thresh = tp['tracked_thresh'] if 'tracked_thresh' in tp else 0.7
         metric_type = tp['metric_type'] if 'metric_type' in tp else 'euclidean'
+
         self.tracker = JDETracker(
+            num_classes=self.num_classes,
             min_box_area=min_box_area,
             vertical_ratio=vertical_ratio,
             conf_thres=conf_thres,
@@ -94,13 +100,13 @@ class JDE_Detector(Detector):
             metric_type=metric_type)
 
     def postprocess(self, pred_dets, pred_embs, threshold):
-        online_targets = self.tracker.update(pred_dets, pred_embs)
-        if online_targets == []:
-            # First few frames, the model may have no tracking results but have
-            # detection results，use the detection results instead, and set id -1.
-            return [pred_dets[0][:4]], [pred_dets[0][4]], [-1]
-        online_tlwhs, online_ids = [], []
-        online_scores = []
+        online_targets_dict = self.tracker.update(pred_dets, pred_embs)
+
+        online_tlwhs = defaultdict(list)
+        online_scores = defaultdict(list)
+        online_ids = defaultdict(list)
+        for cls_id in range(self.num_classes):
+            online_targets = online_targets_dict[cls_id]
             for t in online_targets:
                 tlwh = t.tlwh
                 tid = t.track_id
@@ -110,9 +116,9 @@ class JDE_Detector(Detector):
                 if self.tracker.vertical_ratio > 0 and tlwh[2] / tlwh[
                         3] > self.tracker.vertical_ratio:
                     continue
-            online_tlwhs.append(tlwh)
-            online_ids.append(tid)
-            online_scores.append(tscore)
+                online_tlwhs[cls_id].append(tlwh)
+                online_ids[cls_id].append(tid)
+                online_scores[cls_id].append(tscore)
         return online_tlwhs, online_scores, online_ids
 
     def predict(self, image_list, threshold=0.5, warmup=0, repeats=1):
@@ -121,7 +127,7 @@ class JDE_Detector(Detector):
             image_list (list): list of image
             threshold (float): threshold of predicted box' score
         Returns:
-            online_tlwhs, online_scores, online_ids (np.ndarray)
+            online_tlwhs, online_scores, online_ids (dict[np.array])
         '''
         self.det_times.preprocess_time_s.start()
         inputs = self.preprocess(image_list)
@@ -157,38 +163,12 @@ class JDE_Detector(Detector):
         return online_tlwhs, online_scores, online_ids
 
 
-def write_mot_results(filename, results, data_type='mot'):
-    if data_type in ['mot', 'mcmot', 'lab']:
-        save_format = '{frame},{id},{x1},{y1},{w},{h},{score},-1,-1,-1\n'
-    elif data_type == 'kitti':
-        save_format = '{frame} {id} pedestrian 0 0 -10 {x1} {y1} {x2} {y2} -10 -10 -10 -1000 -1000 -1000 -10\n'
-    else:
-        raise ValueError(data_type)
-
-    with open(filename, 'w') as f:
-        for frame_id, tlwhs, tscores, track_ids in results:
-            if data_type == 'kitti':
-                frame_id -= 1
-            for tlwh, score, track_id in zip(tlwhs, tscores, track_ids):
-                x1, y1, w, h = tlwh
-                x2, y2 = x1 + w, y1 + h
-                line = save_format.format(
-                    frame=frame_id,
-                    id=track_id,
-                    x1=x1,
-                    y1=y1,
-                    x2=x2,
-                    y2=y2,
-                    w=w,
-                    h=h,
-                    score=score)
-                f.write(line)
-
-
 def predict_image(detector, image_list):
     results = []
+    num_classes = detector.num_classes
+    data_type = 'mcmot' if num_classes > 1 else 'mot'
     image_list.sort()
-    for i, img_file in enumerate(image_list):
+    for frame_id, img_file in enumerate(image_list):
         frame = cv2.imread(img_file)
         if FLAGS.run_benchmark:
             detector.predict([frame], FLAGS.threshold, warmup=10, repeats=10)
@@ -196,12 +176,12 @@ def predict_image(detector, image_list):
             detector.cpu_mem += cm
             detector.gpu_mem += gm
             detector.gpu_util += gu
-            print('Test iter {}, file name:{}'.format(i, img_file))
+            print('Test iter {}, file name:{}'.format(frame_id, img_file))
         else:
             online_tlwhs, online_scores, online_ids = detector.predict(
                 [frame], FLAGS.threshold)
-            online_im = mot_vis.plot_tracking(
-                frame, online_tlwhs, online_ids, online_scores, frame_id=i)
+            online_im = plot_tracking_dict(frame, num_classes, online_tlwhs,
+                                           online_ids, online_scores, frame_id)
             if FLAGS.save_images:
                 if not os.path.exists(FLAGS.output_dir):
                     os.makedirs(FLAGS.output_dir)
@@ -233,7 +213,9 @@ def predict_video(detector, camera_id):
         writer = cv2.VideoWriter(out_path, fourcc, fps, (width, height))
     frame_id = 0
     timer = MOTTimer()
-    results = []
+    results = defaultdict(list)  # support single class and multi classes
+    num_classes = detector.num_classes
+    data_type = 'mcmot' if num_classes > 1 else 'mot'
     while (1):
         ret, frame = capture.read()
         if not ret:
@@ -243,10 +225,14 @@ def predict_video(detector, camera_id):
             [frame], FLAGS.threshold)
         timer.toc()
 
-        results.append((frame_id + 1, online_tlwhs, online_scores, online_ids))
+        for cls_id in range(num_classes):
+            results[cls_id].append((frame_id + 1, online_tlwhs[cls_id],
+                                    online_scores[cls_id], online_ids[cls_id]))
+
         fps = 1. / timer.average_time
-        im = mot_vis.plot_tracking(
+        im = plot_tracking_dict(
             frame,
+            num_classes,
             online_tlwhs,
             online_ids,
             online_scores,
@@ -261,14 +247,6 @@ def predict_video(detector, camera_id):
         else:
             writer.write(im)
 
-        if FLAGS.save_mot_txt_per_img:
-            save_dir = os.path.join(FLAGS.output_dir, video_name.split('.')[-2])
-            if not os.path.exists(save_dir):
-                os.makedirs(save_dir)
-            result_filename = os.path.join(save_dir,
-                                           '{:05d}.txt'.format(frame_id))
-            write_mot_results(result_filename, [results[-1]])
-
         frame_id += 1
         print('detect frame: %d' % (frame_id))
         if camera_id != -1:
@@ -278,7 +256,8 @@ def predict_video(detector, camera_id):
     if FLAGS.save_mot_txts:
         result_filename = os.path.join(FLAGS.output_dir,
                                        video_name.split('.')[-2] + '.txt')
-        write_mot_results(result_filename, results)
+
+        write_mot_results(result_filename, results, data_type, num_classes)
 
     if FLAGS.save_images:
         save_dir = os.path.join(FLAGS.output_dir, video_name.split('.')[-2])

deploy/python/mot_keypoint_unite_infer.py

@@ -15,23 +15,23 @@
 import os
 import cv2
 import math
+import copy
 import numpy as np
+from collections import defaultdict
 import paddle
-import copy
 
-from mot_keypoint_unite_utils import argsparser
-from keypoint_infer import KeyPoint_Detector, PredictConfig_KeyPoint
+from utils import get_current_memory_mb
+from infer import Detector, PredictConfig, print_arguments, get_test_images
 from visualize import draw_pose
-from benchmark_utils import PaddleInferBenchmark
-from utils import Timer
 
-from tracker import JDETracker
-from mot_jde_infer import JDE_Detector, write_mot_results
-from infer import Detector, PredictConfig, print_arguments, get_test_images
-from ppdet.modeling.mot import visualization as mot_vis
-from ppdet.modeling.mot.utils import Timer as FPSTimer
-from utils import get_current_memory_mb
+from mot_keypoint_unite_utils import argsparser
+from keypoint_infer import KeyPoint_Detector, PredictConfig_KeyPoint
 from det_keypoint_unite_infer import predict_with_given_det, bench_log
+from mot_jde_infer import JDE_Detector
+
+from ppdet.modeling.mot.visualization import plot_tracking_dict
+from ppdet.modeling.mot.utils import MOTTimer as FPSTimer
+from ppdet.modeling.mot.utils import write_mot_results
 
 # Global dictionary
 KEYPOINT_SUPPORT_MODELS = {
@@ -56,6 +56,9 @@ def mot_keypoint_unite_predict_image(mot_model,
                                      keypoint_model,
                                      image_list,
                                      keypoint_batch_size=1):
+    num_classes = mot_model.num_classes
+    assert num_classes == 1, 'Only one category mot model supported for uniting keypoint deploy.'
+    data_type = 'mot'
     image_list.sort()
     for i, img_file in enumerate(image_list):
         frame = cv2.imread(img_file)
@@ -104,9 +107,13 @@ def mot_keypoint_unite_predict_image(mot_model,
                 if KEYPOINT_SUPPORT_MODELS[keypoint_arch] == 'keypoint_topdown'
                 else None)
 
-            online_im = mot_vis.plot_tracking(
-                im, online_tlwhs, online_ids, online_scores, frame_id=i)
-
+            online_im = plot_tracking_dict(
+                im,
+                num_classes,
+                online_tlwhs,
+                online_ids,
+                online_scores,
+                frame_id=i)
             if FLAGS.save_images:
                 if not os.path.exists(FLAGS.output_dir):
                     os.makedirs(FLAGS.output_dir)
@@ -143,7 +150,13 @@ def mot_keypoint_unite_predict_video(mot_model,
     timer_mot = FPSTimer()
     timer_kp = FPSTimer()
     timer_mot_kp = FPSTimer()
-    mot_results = []
+
+    # support single class and multi classes, but should be single class here
+    mot_results = defaultdict(list)
+    num_classes = mot_model.num_classes
+    assert num_classes == 1, 'Only one category mot model supported for uniting keypoint deploy.'
+    data_type = 'mot'
+
     while (1):
         ret, frame = capture.read()
         if not ret:
@@ -153,15 +166,15 @@ def mot_keypoint_unite_predict_video(mot_model,
         online_tlwhs, online_scores, online_ids = mot_model.predict(
             [frame], FLAGS.mot_threshold)
         timer_mot.toc()
-        mot_results.append(
-            (frame_id + 1, online_tlwhs, online_scores, online_ids))
+        mot_results[0].append(
+            (frame_id + 1, online_tlwhs[0], online_scores[0], online_ids[0]))
         mot_fps = 1. / timer_mot.average_time
 
         timer_kp.tic()
 
         keypoint_arch = keypoint_model.pred_config.arch
         if KEYPOINT_SUPPORT_MODELS[keypoint_arch] == 'keypoint_topdown':
-            results = convert_mot_to_det(online_tlwhs, online_scores)
+            results = convert_mot_to_det(online_tlwhs[0], online_scores[0])
             keypoint_results = predict_with_given_det(
                 frame, results, keypoint_model, keypoint_batch_size,
                 FLAGS.mot_threshold, FLAGS.keypoint_threshold,
@@ -184,8 +197,9 @@ def mot_keypoint_unite_predict_video(mot_model,
             if KEYPOINT_SUPPORT_MODELS[keypoint_arch] == 'keypoint_topdown' else
             None)
 
-        online_im = mot_vis.plot_tracking(
+        online_im = plot_tracking_dict(
             im,
+            num_classes,
             online_tlwhs,
             online_ids,
             online_scores,
@@ -212,7 +226,7 @@ def mot_keypoint_unite_predict_video(mot_model,
     if FLAGS.save_mot_txts:
         result_filename = os.path.join(FLAGS.output_dir,
                                        video_name.split('.')[-2] + '.txt')
-        write_mot_results(result_filename, mot_results)
+        write_mot_results(result_filename, mot_results, data_type, num_classes)
 
     if FLAGS.save_images:
         save_dir = os.path.join(FLAGS.output_dir, video_name.split('.')[-2])

deploy/python/mot_sde_infer.py

@@ -22,7 +22,7 @@ from benchmark_utils import PaddleInferBenchmark
 from preprocess import preprocess
 from tracker import DeepSORTTracker
 from ppdet.modeling.mot import visualization as mot_vis
-from ppdet.modeling.mot.utils import Timer as MOTTimer
+from ppdet.modeling.mot.utils import MOTTimer
 
 from paddle.inference import Config
 from paddle.inference import create_predictor

deploy/python/tracker/__init__.py

@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from . import jde_tracker
 from . import deepsort_tracker
 
-from .jde_tracker import *
 from .deepsort_tracker import *

deploy/python/tracker/jde_tracker.py

-# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-"""
-This code is borrow from https://github.com/Zhongdao/Towards-Realtime-MOT/blob/master/tracker/multitracker.py
-"""
-import numpy as np
-from ppdet.modeling.mot.matching import jde_matching as matching
-from ppdet.modeling.mot.motion import KalmanFilter
-from ppdet.modeling.mot.tracker.base_jde_tracker import TrackState, BaseTrack, STrack
-from ppdet.modeling.mot.tracker.base_jde_tracker import joint_stracks, sub_stracks, remove_duplicate_stracks
-
-__all__ = ['JDETracker']
-
-
-class JDETracker(object):
-    """
-    JDE tracker
-
-    Args:
-        det_thresh (float): threshold of detection score
-        track_buffer (int): buffer for tracker
-        min_box_area (int): min box area to filter out low quality boxes
-        vertical_ratio (float): w/h, the vertical ratio of the bbox to filter
-            bad results, set 1.6 default for pedestrian tracking. If set -1 
-            means no need to filter bboxes.
-        tracked_thresh (float): linear assignment threshold of tracked 
-            stracks and detections
-        r_tracked_thresh (float): linear assignment threshold of 
-            tracked stracks and unmatched detections
-        unconfirmed_thresh (float): linear assignment threshold of 
-            unconfirmed stracks and unmatched detections
-        motion (object): KalmanFilter instance
-        conf_thres (float): confidence threshold for tracking
-        metric_type (str): either "euclidean" or "cosine", the distance metric 
-            used for measurement to track association.
-    """
-
-    def __init__(self,
-                 det_thresh=0.3,
-                 track_buffer=30,
-                 min_box_area=200,
-                 vertical_ratio=1.6,
-                 tracked_thresh=0.7,
-                 r_tracked_thresh=0.5,
-                 unconfirmed_thresh=0.7,
-                 motion='KalmanFilter',
-                 conf_thres=0,
-                 metric_type='euclidean'):
-        self.det_thresh = det_thresh
-        self.track_buffer = track_buffer
-        self.min_box_area = min_box_area
-        self.vertical_ratio = vertical_ratio
-
-        self.tracked_thresh = tracked_thresh
-        self.r_tracked_thresh = r_tracked_thresh
-        self.unconfirmed_thresh = unconfirmed_thresh
-        self.motion = KalmanFilter()
-        self.conf_thres = conf_thres
-        self.metric_type = metric_type
-
-        self.frame_id = 0
-        self.tracked_stracks = []
-        self.lost_stracks = []
-        self.removed_stracks = []
-
-        self.max_time_lost = 0
-        # max_time_lost will be calculated: int(frame_rate / 30.0 * track_buffer)
-
-    def update(self, pred_dets, pred_embs):
-        """
-        Processes the image frame and finds bounding box(detections).
-        Associates the detection with corresponding tracklets and also handles
-            lost, removed, refound and active tracklets.
-
-        Args:
-            pred_dets (Tensor): Detection results of the image, shape is [N, 5].
-            pred_embs (Tensor): Embedding results of the image, shape is [N, 512].
-
-        Return:
-            output_stracks (list): The list contains information regarding the
-                online_tracklets for the recieved image tensor.
-        """
-        self.frame_id += 1
-        activated_starcks = []
-        # for storing active tracks, for the current frame
-        refind_stracks = []
-        # Lost Tracks whose detections are obtained in the current frame
-        lost_stracks = []
-        # The tracks which are not obtained in the current frame but are not 
-        # removed. (Lost for some time lesser than the threshold for removing)
-        removed_stracks = []
-
-        remain_inds = np.nonzero(pred_dets[:, 4] > self.conf_thres)
-        if len(remain_inds) == 0:
-            pred_dets = np.zeros([0, 1])
-            pred_embs = np.zeros([0, 1])
-        else:
-            pred_dets = pred_dets[remain_inds]
-            pred_embs = pred_embs[remain_inds]
-
-        # Filter out the image with box_num = 0. pred_dets = [[0.0, 0.0, 0.0 ,0.0]]
-        empty_pred = True if len(pred_dets) == 1 and np.sum(
-            pred_dets) == 0.0 else False
-        """ Step 1: Network forward, get detections & embeddings"""
-        if len(pred_dets) > 0 and not empty_pred:
-            detections = [
-                STrack(STrack.tlbr_to_tlwh(tlbrs[:4]), tlbrs[4], f, 30)
-                for (tlbrs, f) in zip(pred_dets, pred_embs)
-            ]
-        else:
-            detections = []
-        ''' Add newly detected tracklets to tracked_stracks'''
-        unconfirmed = []
-        tracked_stracks = []  # type: list[STrack]
-        for track in self.tracked_stracks:
-            if not track.is_activated:
-                # previous tracks which are not active in the current frame are added in unconfirmed list
-                unconfirmed.append(track)
-            else:
-                # Active tracks are added to the local list 'tracked_stracks'
-                tracked_stracks.append(track)
-        """ Step 2: First association, with embedding"""
-        # Combining currently tracked_stracks and lost_stracks
-        strack_pool = joint_stracks(tracked_stracks, self.lost_stracks)
-        # Predict the current location with KF
-        STrack.multi_predict(strack_pool, self.motion)
-
-        dists = matching.embedding_distance(
-            strack_pool, detections, metric=self.metric_type)
-        dists = matching.fuse_motion(self.motion, dists, strack_pool,
-                                     detections)
-        # The dists is the list of distances of the detection with the tracks in strack_pool
-        matches, u_track, u_detection = matching.linear_assignment(
-            dists, thresh=self.tracked_thresh)
-        # The matches is the array for corresponding matches of the detection with the corresponding strack_pool
-
-        for itracked, idet in matches:
-            # itracked is the id of the track and idet is the detection
-            track = strack_pool[itracked]
-            det = detections[idet]
-            if track.state == TrackState.Tracked:
-                # If the track is active, add the detection to the track
-                track.update(detections[idet], self.frame_id)
-                activated_starcks.append(track)
-            else:
-                # We have obtained a detection from a track which is not active,
-                # hence put the track in refind_stracks list
-                track.re_activate(det, self.frame_id, new_id=False)
-                refind_stracks.append(track)
-
-        # None of the steps below happen if there are no undetected tracks.
-        """ Step 3: Second association, with IOU"""
-        detections = [detections[i] for i in u_detection]
-        # detections is now a list of the unmatched detections
-        r_tracked_stracks = []
-        # This is container for stracks which were tracked till the previous
-        # frame but no detection was found for it in the current frame.
-
-        for i in u_track:
-            if strack_pool[i].state == TrackState.Tracked:
-                r_tracked_stracks.append(strack_pool[i])
-        dists = matching.iou_distance(r_tracked_stracks, detections)
-        matches, u_track, u_detection = matching.linear_assignment(
-            dists, thresh=self.r_tracked_thresh)
-        # matches is the list of detections which matched with corresponding
-        # tracks by IOU distance method.
-
-        for itracked, idet in matches:
-            track = r_tracked_stracks[itracked]
-            det = detections[idet]
-            if track.state == TrackState.Tracked:
-                track.update(det, self.frame_id)
-                activated_starcks.append(track)
-            else:
-                track.re_activate(det, self.frame_id, new_id=False)
-                refind_stracks.append(track)
-        # Same process done for some unmatched detections, but now considering IOU_distance as measure
-
-        for it in u_track:
-            track = r_tracked_stracks[it]
-            if not track.state == TrackState.Lost:
-                track.mark_lost()
-                lost_stracks.append(track)
-        # If no detections are obtained for tracks (u_track), the tracks are added to lost_tracks list and are marked lost
-        '''Deal with unconfirmed tracks, usually tracks with only one beginning frame'''
-        detections = [detections[i] for i in u_detection]
-        dists = matching.iou_distance(unconfirmed, detections)
-        matches, u_unconfirmed, u_detection = matching.linear_assignment(
-            dists, thresh=self.unconfirmed_thresh)
-        for itracked, idet in matches:
-            unconfirmed[itracked].update(detections[idet], self.frame_id)
-            activated_starcks.append(unconfirmed[itracked])
-
-        # The tracks which are yet not matched
-        for it in u_unconfirmed:
-            track = unconfirmed[it]
-            track.mark_removed()
-            removed_stracks.append(track)
-
-        # after all these confirmation steps, if a new detection is found, it is initialized for a new track
-        """ Step 4: Init new stracks"""
-        for inew in u_detection:
-            track = detections[inew]
-            if track.score < self.det_thresh:
-                continue
-            track.activate(self.motion, self.frame_id)
-            activated_starcks.append(track)
-        """ Step 5: Update state"""
-        # If the tracks are lost for more frames than the threshold number, the tracks are removed.
-        for track in self.lost_stracks:
-            if self.frame_id - track.end_frame > self.max_time_lost:
-                track.mark_removed()
-                removed_stracks.append(track)
-
-        # Update the self.tracked_stracks and self.lost_stracks using the updates in this step.
-        self.tracked_stracks = [
-            t for t in self.tracked_stracks if t.state == TrackState.Tracked
-        ]
-        self.tracked_stracks = joint_stracks(self.tracked_stracks,
-                                             activated_starcks)
-        self.tracked_stracks = joint_stracks(self.tracked_stracks,
-                                             refind_stracks)
-
-        self.lost_stracks = sub_stracks(self.lost_stracks, self.tracked_stracks)
-        self.lost_stracks.extend(lost_stracks)
-        self.lost_stracks = sub_stracks(self.lost_stracks, self.removed_stracks)
-        self.removed_stracks.extend(removed_stracks)
-        self.tracked_stracks, self.lost_stracks = remove_duplicate_stracks(
-            self.tracked_stracks, self.lost_stracks)
-        # get scores of lost tracks
-        output_stracks = [
-            track for track in self.tracked_stracks if track.is_activated
-        ]
-
-        return output_stracks

ppdet/data/source/category.py

@@ -90,9 +90,12 @@ def get_categories(metric_type, anno_file=None, arch=None):
     elif metric_type.lower() in ['mot', 'motdet', 'reid']:
         return _mot_category()
 
-    elif metric_type.lower() in ['kitti', 'bdd100k']:
+    elif metric_type.lower() in ['kitti', 'bdd100kmot']:
         return _mot_category(category='car')
 
+    elif metric_type.lower() in ['mcmot']:
+        return _visdrone_category()
+
     else:
         raise ValueError("unknown metric type {}".format(metric_type))
 
@@ -825,3 +828,21 @@ def _oid19_category():
     }
 
     return clsid2catid, catid2name
+
+
+def _visdrone_category():
+    clsid2catid = {i: i for i in range(10)}
+
+    catid2name = {
+        0: 'pedestrian',
+        1: 'people',
+        2: 'bicycle',
+        3: 'car',
+        4: 'van',
+        5: 'truck',
+        6: 'tricycle',
+        7: 'awning-tricycle',
+        8: 'bus',
+        9: 'motor'
+    }
+    return clsid2catid, catid2name

ppdet/data/source/mot.py

@@ -17,7 +17,7 @@ import sys
 import cv2
 import glob
 import numpy as np
-from collections import OrderedDict
+from collections import OrderedDict, defaultdict
 try:
     from collections.abc import Sequence
 except Exception:
@@ -32,7 +32,8 @@ logger = setup_logger(__name__)
 @serializable
 class MOTDataSet(DetDataset):
     """
-    Load dataset with MOT format.
+    Load dataset with MOT format, only support single class MOT.
+
     Args:
         dataset_dir (str): root directory for dataset.
         image_lists (str|list): mot data image lists, muiti-source mot dataset.
@@ -152,18 +153,17 @@ class MOTDataSet(DetDataset):
             self.tid_start_index[k] = last_index
             last_index += v
 
-        self.total_identities = int(last_index + 1)
+        self.num_identities_dict = defaultdict(int)
+        self.num_identities_dict[0] = int(last_index + 1) # single class
         self.num_imgs_each_data = [len(x) for x in self.img_files.values()]
         self.total_imgs = sum(self.num_imgs_each_data)
 
-        logger.info('=' * 80)
         logger.info('MOT dataset summary: ')
         logger.info(self.tid_num)
-        logger.info('total images: {}'.format(self.total_imgs))
-        logger.info('image start index: {}'.format(self.img_start_index))
-        logger.info('total identities: {}'.format(self.total_identities))
-        logger.info('identity start index: {}'.format(self.tid_start_index))
-        logger.info('=' * 80)
+        logger.info('Total images: {}'.format(self.total_imgs))
+        logger.info('Image start index: {}'.format(self.img_start_index))
+        logger.info('Total identities: {}'.format(self.num_identities_dict[0]))
+        logger.info('Identity start index: {}'.format(self.tid_start_index))
 
         records = []
         cname2cid = mot_label()
@@ -222,9 +222,223 @@ class MOTDataSet(DetDataset):
         self.roidbs, self.cname2cid = records, cname2cid
 
 
-def mot_label():
-    labels_map = {'person': 0}
-    return labels_map
+@register
+@serializable
+class MCMOTDataSet(DetDataset):
+    """
+    Load dataset with MOT format, support multi-class MOT.
+
+    Args:
+        dataset_dir (str): root directory for dataset.
+        image_lists (list(str)): mcmot data image lists, muiti-source mcmot dataset.
+        data_fields (list): key name of data dictionary, at least have 'image'.
+        label_list (str): if use_default_label is False, will load
+            mapping between category and class index.
+        sample_num (int): number of samples to load, -1 means all.
+
+    Notes:
+        MCMOT datasets root directory following this:
+            dataset/mot
+            |——————image_lists
+            |        |——————visdrone_mcmot.train  
+            |        |——————visdrone_mcmot.val   
+            visdrone_mcmot
+            |——————images
+            |        └——————train
+            |        └——————val
+            └——————labels_with_ids
+                        └——————train
+    """
+    def __init__(self,
+                 dataset_dir=None,
+                 image_lists=[],
+                 data_fields=['image'],
+                 label_list=None,
+                 sample_num=-1):
+        super(MCMOTDataSet, self).__init__(
+            dataset_dir=dataset_dir,
+            data_fields=data_fields,
+            sample_num=sample_num)
+        self.dataset_dir = dataset_dir
+        self.image_lists = image_lists
+        if isinstance(self.image_lists, str):
+            self.image_lists = [self.image_lists]
+        self.label_list = label_list
+        self.roidbs = None
+        self.cname2cid = None
+
+    def get_anno(self):
+        if self.image_lists == []:
+            return
+        # only used to get categories and metric
+        return os.path.join(self.dataset_dir, 'image_lists',
+                            self.image_lists[0])
+
+    def parse_dataset(self):
+        self.img_files = OrderedDict()
+        self.img_start_index = OrderedDict()
+        self.label_files = OrderedDict()
+        self.tid_num = OrderedDict()
+        self.tid_start_idx_of_cls_ids = defaultdict(dict)  # for MCMOT
+
+        img_index = 0
+        for data_name in self.image_lists:
+            # check every data image list
+            image_lists_dir = os.path.join(self.dataset_dir, 'image_lists')
+            assert os.path.isdir(image_lists_dir), \
+                "The {} is not a directory.".format(image_lists_dir)
+
+            list_path = os.path.join(image_lists_dir, data_name)
+            assert os.path.exists(list_path), \
+                "The list path {} does not exist.".format(list_path)
+
+            # record img_files, filter out empty ones
+            with open(list_path, 'r') as file:
+                self.img_files[data_name] = file.readlines()
+                self.img_files[data_name] = [
+                    os.path.join(self.dataset_dir, x.strip())
+                    for x in self.img_files[data_name]
+                ]
+                self.img_files[data_name] = list(
+                    filter(lambda x: len(x) > 0, self.img_files[data_name]))
+
+                self.img_start_index[data_name] = img_index
+                img_index += len(self.img_files[data_name])
+
+            # record label_files
+            self.label_files[data_name] = [
+                x.replace('images', 'labels_with_ids').replace(
+                    '.png', '.txt').replace('.jpg', '.txt')
+                for x in self.img_files[data_name]
+            ]
+
+        for data_name, label_paths in self.label_files.items():
+            # using max_ids_dict rather than max_index
+            max_ids_dict = defaultdict(int)
+            for lp in label_paths:
+                lb = np.loadtxt(lp)
+                if len(lb) < 1:
+                    continue
+                lb = lb.reshape(-1, 6)
+                for item in lb:
+                    if item[1] > max_ids_dict[int(item[0])]:
+                        # item[0]: cls_id
+                        # item[1]: track id
+                        max_ids_dict[int(item[0])] = int(item[1])
+            # track id number
+            self.tid_num[data_name] = max_ids_dict
+
+        last_idx_dict = defaultdict(int)
+        for i, (k, v) in enumerate(self.tid_num.items()):  # each sub dataset
+            for cls_id, id_num in v.items():  # v is a max_ids_dict
+                self.tid_start_idx_of_cls_ids[k][cls_id] = last_idx_dict[cls_id]
+                last_idx_dict[cls_id] += id_num
+
+        self.num_identities_dict = defaultdict(int)
+        for k, v in last_idx_dict.items():
+            self.num_identities_dict[k] = int(v)  # total ids of each category
+
+        self.num_imgs_each_data = [len(x) for x in self.img_files.values()]
+        self.total_imgs = sum(self.num_imgs_each_data)
+
+        # cname2cid and cid2cname 
+        cname2cid = {}
+        if self.label_list:
+            # if use label_list for multi source mix dataset, 
+            # please make sure label_list in the first sub_dataset at least.
+            sub_dataset = self.image_lists[0].split('.')[0]
+            label_path = os.path.join(self.dataset_dir, sub_dataset,
+                                      self.label_list)
+            if not os.path.exists(label_path):
+                raise ValueError("label_list {} does not exists".format(
+                    label_path))
+            with open(label_path, 'r') as fr:
+                label_id = 0
+                for line in fr.readlines():
+                    cname2cid[line.strip()] = label_id
+                    label_id += 1
+        else:
+            cname2cid = visdrone_mcmot_label()
+        cid2cname = dict([(v, k) for (k, v) in cname2cid.items()])
+
+        logger.info('MCMOT dataset summary: ')
+        logger.info(self.tid_num)
+        logger.info('Total images: {}'.format(self.total_imgs))
+        logger.info('Image start index: {}'.format(self.img_start_index))
+
+        logger.info('Total identities of each category: ')
+        self.num_identities_dict = sorted(
+            self.num_identities_dict.items(), key=lambda x: x[0])
+        total_IDs_all_cats = 0
+        for (k, v) in self.num_identities_dict:
+            logger.info('Category {} [{}] has {} IDs.'.format(k, cid2cname[k],
+                                                              v))
+            total_IDs_all_cats += v
+        logger.info('Total identities of all categories: {}'.format(
+            total_IDs_all_cats))
+
+        logger.info('Identity start index of each category: ')
+        for k, v in self.tid_start_idx_of_cls_ids.items():
+            sorted_v = sorted(v.items(), key=lambda x: x[0])
+            for (cls_id, start_idx) in sorted_v:
+                logger.info('Start index of dataset {} category {:d} is {:d}'
+                            .format(k, cls_id, start_idx))
+
+        records = []
+        for img_index in range(self.total_imgs):
+            for i, (k, v) in enumerate(self.img_start_index.items()):
+                if img_index >= v:
+                    data_name = list(self.label_files.keys())[i]
+                    start_index = v
+            img_file = self.img_files[data_name][img_index - start_index]
+            lbl_file = self.label_files[data_name][img_index - start_index]
+
+            if not os.path.exists(img_file):
+                logger.warning('Illegal image file: {}, and it will be ignored'.
+                               format(img_file))
+                continue
+            if not os.path.isfile(lbl_file):
+                logger.warning('Illegal label file: {}, and it will be ignored'.
+                               format(lbl_file))
+                continue
+
+            labels = np.loadtxt(lbl_file, dtype=np.float32).reshape(-1, 6)
+            # each row in labels (N, 6) is [gt_class, gt_identity, cx, cy, w, h]
+
+            cx, cy = labels[:, 2], labels[:, 3]
+            w, h = labels[:, 4], labels[:, 5]
+            gt_bbox = np.stack((cx, cy, w, h)).T.astype('float32')
+            gt_class = labels[:, 0:1].astype('int32')
+            gt_score = np.ones((len(labels), 1)).astype('float32')
+            gt_ide = labels[:, 1:2].astype('int32')
+            for i, _ in enumerate(gt_ide):
+                if gt_ide[i] > -1:
+                    cls_id = int(gt_class[i])
+                    start_idx = self.tid_start_idx_of_cls_ids[data_name][cls_id]
+                    gt_ide[i] += start_idx
+
+            mot_rec = {
+                'im_file': img_file,
+                'im_id': img_index,
+            } if 'image' in self.data_fields else {}
+
+            gt_rec = {
+                'gt_class': gt_class,
+                'gt_score': gt_score,
+                'gt_bbox': gt_bbox,
+                'gt_ide': gt_ide,
+            }
+
+            for k, v in gt_rec.items():
+                if k in self.data_fields:
+                    mot_rec[k] = v
+
+            records.append(mot_rec)
+            if self.sample_num > 0 and img_index >= self.sample_num:
+                break
+        assert len(records) > 0, 'not found any mot record in %s' % (
+            self.image_lists)
+        self.roidbs, self.cname2cid = records, cname2cid
 
 
 @register
@@ -382,3 +596,24 @@ def video2frames(video_path, outpath, frame_rate, **kargs):
 
     sys.stdout.flush()
     return out_full_path
+
+
+def mot_label():
+    labels_map = {'person': 0}
+    return labels_map
+
+
+def visdrone_mcmot_label():
+    labels_map = {
+        'pedestrian': 0,
+        'people': 1,
+        'bicycle': 2,
+        'car': 3,
+        'van': 4,
+        'truck': 5,
+        'tricycle': 6,
+        'awning-tricycle': 7,
+        'bus': 8,
+        'motor': 9,
+    }
+    return labels_map

ppdet/data/transform/mot_operators.py

@@ -556,6 +556,11 @@ class Gt2FairMOTTarget(Gt2TTFTarget):
             index_mask = np.zeros((self.max_objs, ), dtype=np.int32)
             reid = np.zeros((self.max_objs, ), dtype=np.int64)
             bbox_xys = np.zeros((self.max_objs, 4), dtype=np.float32)
+            if self.num_classes > 1:
+                # each category corresponds to a set of track ids
+                cls_tr_ids = np.zeros(
+                    (self.num_classes, output_h, output_w), dtype=np.int64)
+                cls_id_map = np.full((output_h, output_w), -1, dtype=np.int64)
 
             gt_bbox = sample['gt_bbox']
             gt_class = sample['gt_class']
@@ -598,6 +603,10 @@ class Gt2FairMOTTarget(Gt2TTFTarget):
                     index_mask[k] = 1
                     reid[k] = ide
                     bbox_xys[k] = bbox_xy
+                    if self.num_classes > 1:
+                        cls_id_map[ct_int[1], ct_int[0]] = cls_id
+                        cls_tr_ids[cls_id][ct_int[1]][ct_int[0]] = ide - 1
+                        # track id start from 0
 
             sample['heatmap'] = heatmap
             sample['index'] = index
@@ -605,6 +614,9 @@ class Gt2FairMOTTarget(Gt2TTFTarget):
             sample['size'] = bbox_size
             sample['index_mask'] = index_mask
             sample['reid'] = reid
+            if self.num_classes > 1:
+                sample['cls_id_map'] = cls_id_map
+                sample['cls_tr_ids'] = cls_tr_ids
             sample['bbox_xys'] = bbox_xys
             sample.pop('is_crowd', None)
             sample.pop('difficult', None)

ppdet/engine/tracker.py

@@ -21,14 +21,15 @@ import cv2
 import glob
 import paddle
 import numpy as np
+from collections import defaultdict
 
 from ppdet.core.workspace import create
 from ppdet.utils.checkpoint import load_weight, load_pretrain_weight
 from ppdet.modeling.mot.utils import Detection, get_crops, scale_coords, clip_box
-from ppdet.modeling.mot.utils import Timer, load_det_results
-from ppdet.modeling.mot import visualization as mot_vis
+from ppdet.modeling.mot.utils import MOTTimer, load_det_results, write_mot_results, save_vis_results
 
 from ppdet.metrics import Metric, MOTMetric, KITTIMOTMetric
+from ppdet.metrics import MCMOTMetric
 import ppdet.utils.stats as stats
 
 from .callbacks import Callback, ComposeCallback
@@ -74,6 +75,8 @@ class Tracker(object):
 
         if self.cfg.metric == 'MOT':
             self._metrics = [MOTMetric(), ]
+        elif self.cfg.metric == 'MCMOT':
+            self._metrics = [MCMOTMetric(self.cfg.num_classes), ]
         elif self.cfg.metric == 'KITTI':
             self._metrics = [KITTIMOTMetric(), ]
         else:
@@ -121,43 +124,49 @@ class Tracker(object):
         tracker = self.model.tracker
         tracker.max_time_lost = int(frame_rate / 30.0 * tracker.track_buffer)
 
-        timer = Timer()
-        results = []
+        timer = MOTTimer()
         frame_id = 0
         self.status['mode'] = 'track'
         self.model.eval()
+        results = defaultdict(list)  # support single class and multi classes
+
         for step_id, data in enumerate(dataloader):
             self.status['step_id'] = step_id
             if frame_id % 40 == 0:
                 logger.info('Processing frame {} ({:.2f} fps)'.format(
                     frame_id, 1. / max(1e-5, timer.average_time)))
-
             # forward
             timer.tic()
             pred_dets, pred_embs = self.model(data)
-            online_targets = self.model.tracker.update(pred_dets, pred_embs)
 
-            online_tlwhs, online_scores, online_ids = [], [], []
+            pred_dets, pred_embs = pred_dets.numpy(), pred_embs.numpy()
+            online_targets_dict = self.model.tracker.update(pred_dets,
+                                                            pred_embs)
+            online_tlwhs = defaultdict(list)
+            online_scores = defaultdict(list)
+            online_ids = defaultdict(list)
+            for cls_id in range(self.cfg.num_classes):
+                online_targets = online_targets_dict[cls_id]
                 for t in online_targets:
                     tlwh = t.tlwh
                     tid = t.track_id
                     tscore = t.score
-                if tscore < draw_threshold: continue
                     if tlwh[2] * tlwh[3] <= tracker.min_box_area: continue
                     if tracker.vertical_ratio > 0 and tlwh[2] / tlwh[
                             3] > tracker.vertical_ratio:
                         continue
-                online_tlwhs.append(tlwh)
-                online_ids.append(tid)
-                online_scores.append(tscore)
-            timer.toc()
-
+                    online_tlwhs[cls_id].append(tlwh)
+                    online_ids[cls_id].append(tid)
+                    online_scores[cls_id].append(tscore)
                 # save results
-            results.append(
-                (frame_id + 1, online_tlwhs, online_scores, online_ids))
-            self.save_results(data, frame_id, online_ids, online_tlwhs,
+                results[cls_id].append(
+                    (frame_id + 1, online_tlwhs[cls_id], online_scores[cls_id],
+                     online_ids[cls_id]))
+
+            timer.toc()
+            save_vis_results(data, frame_id, online_ids, online_tlwhs,
                              online_scores, timer.average_time, show_image,
-                              save_dir)
+                             save_dir, self.cfg.num_classes)
             frame_id += 1
 
         return results, frame_id, timer.average_time, timer.calls
@@ -174,7 +183,7 @@ class Tracker(object):
             if not os.path.exists(save_dir): os.makedirs(save_dir)
         use_detector = False if not self.model.detector else True
 
-        timer = Timer()
+        timer = MOTTimer()
         results = []
         frame_id = 0
         self.status['mode'] = 'track'
@@ -284,9 +293,9 @@ class Tracker(object):
             # save results
             results.append(
                 (frame_id + 1, online_tlwhs, online_scores, online_ids))
-            self.save_results(data, frame_id, online_ids, online_tlwhs,
+            save_vis_results(data, frame_id, online_ids, online_tlwhs,
                              online_scores, timer.average_time, show_image,
-                              save_dir)
+                             save_dir, self.cfg.num_classes)
             frame_id += 1
 
         return results, frame_id, timer.average_time, timer.calls
@@ -305,37 +314,39 @@ class Tracker(object):
         if not os.path.exists(output_dir): os.makedirs(output_dir)
         result_root = os.path.join(output_dir, 'mot_results')
         if not os.path.exists(result_root): os.makedirs(result_root)
-        assert data_type in ['mot', 'kitti'], \
-            "data_type should be 'mot' or 'kitti'"
+        assert data_type in ['mot', 'mcmot', 'kitti'], \
+            "data_type should be 'mot', 'mcmot' or 'kitti'"
         assert model_type in ['JDE', 'DeepSORT', 'FairMOT'], \
             "model_type should be 'JDE', 'DeepSORT' or 'FairMOT'"
 
         # run tracking
-
         n_frame = 0
         timer_avgs, timer_calls = [], []
         for seq in seqs:
-            if not os.path.isdir(os.path.join(data_root, seq)):
+            infer_dir = os.path.join(data_root, seq)
+            if not os.path.exists(infer_dir) or not os.path.isdir(infer_dir):
+                logger.warning("Seq {} error, {} has no images.".format(
+                    seq, infer_dir))
                 continue
-            infer_dir = os.path.join(data_root, seq, 'img1')
+            if os.path.exists(os.path.join(infer_dir, 'img1')):
+                infer_dir = os.path.join(infer_dir, 'img1')
+
+            frame_rate = 30
             seqinfo = os.path.join(data_root, seq, 'seqinfo.ini')
-            if not os.path.exists(seqinfo) or not os.path.exists(
-                    infer_dir) or not os.path.isdir(infer_dir):
-                continue
+            if os.path.exists(seqinfo):
+                meta_info = open(seqinfo).read()
+                frame_rate = int(meta_info[meta_info.find('frameRate') + 10:
+                                           meta_info.find('\nseqLength')])
 
             save_dir = os.path.join(output_dir, 'mot_outputs',
                                     seq) if save_images or save_videos else None
             logger.info('start seq: {}'.format(seq))
 
-            images = self.get_infer_images(infer_dir)
-            self.dataset.set_images(images)
-
+            self.dataset.set_images(self.get_infer_images(infer_dir))
             dataloader = create('EvalMOTReader')(self.dataset, 0)
 
             result_filename = os.path.join(result_root, '{}.txt'.format(seq))
-            meta_info = open(seqinfo).read()
-            frame_rate = int(meta_info[meta_info.find('frameRate') + 10:
-                                       meta_info.find('\nseqLength')])
+
             with paddle.no_grad():
                 if model_type in ['JDE', 'FairMOT']:
                     results, nf, ta, tc = self._eval_seq_jde(
@@ -355,7 +366,8 @@ class Tracker(object):
                 else:
                     raise ValueError(model_type)
 
-            self.write_mot_results(result_filename, results, data_type)
+            write_mot_results(result_filename, results, data_type,
+                              self.cfg.num_classes)
             n_frame += nf
             timer_avgs.append(ta)
             timer_calls.append(tc)
@@ -427,8 +439,8 @@ class Tracker(object):
         if not os.path.exists(output_dir): os.makedirs(output_dir)
         result_root = os.path.join(output_dir, 'mot_results')
         if not os.path.exists(result_root): os.makedirs(result_root)
-        assert data_type in ['mot', 'kitti'], \
-            "data_type should be 'mot' or 'kitti'"
+        assert data_type in ['mot', 'mcmot', 'kitti'], \
+            "data_type should be 'mot', 'mcmot' or 'kitti'"
         assert model_type in ['JDE', 'DeepSORT', 'FairMOT'], \
             "model_type should be 'JDE', 'DeepSORT' or 'FairMOT'"
 
@@ -478,7 +490,8 @@ class Tracker(object):
             else:
                 raise ValueError(model_type)
 
-        self.write_mot_results(result_filename, results, data_type)
+        write_mot_results(result_filename, results, data_type,
+                          self.cfg.num_classes)
 
         if save_videos:
             output_video_path = os.path.join(save_dir, '..',
@@ -487,52 +500,3 @@ class Tracker(object):
                 save_dir, output_video_path)
             os.system(cmd_str)
             logger.info('Save video in {}'.format(output_video_path))
-
-    def write_mot_results(self, filename, results, data_type='mot'):
-        if data_type in ['mot', 'mcmot', 'lab']:
-            save_format = '{frame},{id},{x1},{y1},{w},{h},{score},-1,-1,-1\n'
-        elif data_type == 'kitti':
-            save_format = '{frame} {id} car 0 0 -10 {x1} {y1} {x2} {y2} -10 -10 -10 -1000 -1000 -1000 -10\n'
-        else:
-            raise ValueError(data_type)
-
-        with open(filename, 'w') as f:
-            for frame_id, tlwhs, tscores, track_ids in results:
-                if data_type == 'kitti':
-                    frame_id -= 1
-                for tlwh, score, track_id in zip(tlwhs, tscores, track_ids):
-                    if track_id < 0:
-                        continue
-                    x1, y1, w, h = tlwh
-                    x2, y2 = x1 + w, y1 + h
-                    line = save_format.format(
-                        frame=frame_id,
-                        id=track_id,
-                        x1=x1,
-                        y1=y1,
-                        x2=x2,
-                        y2=y2,
-                        w=w,
-                        h=h,
-                        score=score)
-                    f.write(line)
-        logger.info('MOT results save in {}'.format(filename))
-
-    def save_results(self, data, frame_id, online_ids, online_tlwhs,
-                     online_scores, average_time, show_image, save_dir):
-        if show_image or save_dir is not None:
-            assert 'ori_image' in data
-            img0 = data['ori_image'].numpy()[0]
-            online_im = mot_vis.plot_tracking(
-                img0,
-                online_tlwhs,
-                online_ids,
-                online_scores,
-                frame_id=frame_id,
-                fps=1. / average_time)
-        if show_image:
-            cv2.imshow('online_im', online_im)
-        if save_dir is not None:
-            cv2.imwrite(
-                os.path.join(save_dir, '{:05d}.jpg'.format(frame_id)),
-                online_im)

ppdet/engine/trainer.py

@@ -41,7 +41,7 @@ from ppdet.data.source.category import get_categories
 import ppdet.utils.stats as stats
 from ppdet.utils import profiler
 
-from .callbacks import Callback, ComposeCallback, LogPrinter, Checkpointer, WiferFaceEval, VisualDLWriter,SniperProposalsGenerator
+from .callbacks import Callback, ComposeCallback, LogPrinter, Checkpointer, WiferFaceEval, VisualDLWriter, SniperProposalsGenerator
 from .export_utils import _dump_infer_config, _prune_input_spec
 
 from ppdet.utils.logger import setup_logger
@@ -77,11 +77,12 @@ class Trainer(object):
 
         if cfg.architecture == 'JDE' and self.mode == 'train':
             cfg['JDEEmbeddingHead'][
-                'num_identifiers'] = self.dataset.total_identities
+                'num_identities'] = self.dataset.num_identities_dict[0]
+            # JDE only support single class MOT now.
 
         if cfg.architecture == 'FairMOT' and self.mode == 'train':
-            cfg['FairMOTEmbeddingHead'][
-                'num_identifiers'] = self.dataset.total_identities
+            cfg['FairMOTEmbeddingHead']['num_identities_dict'] = self.dataset.num_identities_dict
+            # FairMOT support single class and multi-class MOT now.
 
         # build model
         if 'model' not in self.cfg:
@@ -202,8 +203,7 @@ class Trainer(object):
                         output_eval=output_eval,
                         bias=bias,
                         IouType=IouType,
-                        save_prediction_only=save_prediction_only
-                    )
+                        save_prediction_only=save_prediction_only)
                 ]
         elif self.cfg.metric == 'RBOX':
             # TODO: bias should be unified
@@ -516,7 +516,8 @@ class Trainer(object):
             results.append(outs)
         # sniper
         if type(self.dataset) == SniperCOCODataSet:
-            results = self.dataset.anno_cropper.aggregate_chips_detections(results)
+            results = self.dataset.anno_cropper.aggregate_chips_detections(
+                results)
 
         for outs in results:
             batch_res = get_infer_results(outs, clsid2catid)

ppdet/metrics/__init__.py

@@ -22,4 +22,8 @@ __all__ = metrics.__all__ + keypoint_metrics.__all__
 
 from . import mot_metrics
 from .mot_metrics import *
-__all__ = __all__ + mot_metrics.__all__
+__all__ = metrics.__all__ + mot_metrics.__all__
+
+from . import mcmot_metrics
+from .mcmot_metrics import *
+__all__ = metrics.__all__ + mcmot_metrics.__all__
\ No newline at end of file

ppdet/metrics/mcmot_metrics.py

+# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved. 
+#   
+# Licensed under the Apache License, Version 2.0 (the "License");   
+# you may not use this file except in compliance with the License.  
+# You may obtain a copy of the License at   
+#   
+#     http://www.apache.org/licenses/LICENSE-2.0    
+#   
+# Unless required by applicable law or agreed to in writing, software   
+# distributed under the License is distributed on an "AS IS" BASIS, 
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  
+# See the License for the specific language governing permissions and   
+# limitations under the License.
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import os
+import copy
+import sys
+import math
+from collections import defaultdict
+from motmetrics.math_util import quiet_divide
+
+import numpy as np
+import pandas as pd
+
+import paddle
+import paddle.nn.functional as F
+from .metrics import Metric
+import motmetrics as mm
+import openpyxl
+metrics = mm.metrics.motchallenge_metrics
+mh = mm.metrics.create()
+from ppdet.utils.logger import setup_logger
+logger = setup_logger(__name__)
+
+__all__ = ['MCMOTEvaluator', 'MCMOTMetric']
+
+METRICS_LIST = [
+    'num_frames', 'num_matches', 'num_switches', 'num_transfer', 'num_ascend',
+    'num_migrate', 'num_false_positives', 'num_misses', 'num_detections',
+    'num_objects', 'num_predictions', 'num_unique_objects', 'mostly_tracked',
+    'partially_tracked', 'mostly_lost', 'num_fragmentations', 'motp', 'mota',
+    'precision', 'recall', 'idfp', 'idfn', 'idtp', 'idp', 'idr', 'idf1'
+]
+
+NAME_MAP = {
+    'num_frames': 'num_frames',
+    'num_matches': 'num_matches',
+    'num_switches': 'IDs',
+    'num_transfer': 'IDt',
+    'num_ascend': 'IDa',
+    'num_migrate': 'IDm',
+    'num_false_positives': 'FP',
+    'num_misses': 'FN',
+    'num_detections': 'num_detections',
+    'num_objects': 'num_objects',
+    'num_predictions': 'num_predictions',
+    'num_unique_objects': 'GT',
+    'mostly_tracked': 'MT',
+    'partially_tracked': 'partially_tracked',
+    'mostly_lost': 'ML',
+    'num_fragmentations': 'FM',
+    'motp': 'MOTP',
+    'mota': 'MOTA',
+    'precision': 'Prcn',
+    'recall': 'Rcll',
+    'idfp': 'idfp',
+    'idfn': 'idfn',
+    'idtp': 'idtp',
+    'idp': 'IDP',
+    'idr': 'IDR',
+    'idf1': 'IDF1'
+}
+
+
+def parse_accs_metrics(seq_acc, index_name, verbose=False):
+    """
+    Parse the evaluation indicators of multiple MOTAccumulator 
+    """
+    mh = mm.metrics.create()
+    summary = MCMOTEvaluator.get_summary(seq_acc, index_name, METRICS_LIST)
+    summary.loc['OVERALL', 'motp'] = (summary['motp'] * summary['num_detections']).sum() / \
+                                     summary.loc['OVERALL', 'num_detections']
+    if verbose:
+        strsummary = mm.io.render_summary(
+            summary, formatters=mh.formatters, namemap=NAME_MAP)
+        print(strsummary)
+
+    return summary
+
+
+def seqs_overall_metrics(summary_df, verbose=False):
+    """
+    Calculate overall metrics for multiple sequences
+    """
+    add_col = [
+        'num_frames', 'num_matches', 'num_switches', 'num_transfer',
+        'num_ascend', 'num_migrate', 'num_false_positives', 'num_misses',
+        'num_detections', 'num_objects', 'num_predictions',
+        'num_unique_objects', 'mostly_tracked', 'partially_tracked',
+        'mostly_lost', 'num_fragmentations', 'idfp', 'idfn', 'idtp'
+    ]
+    calc_col = ['motp', 'mota', 'precision', 'recall', 'idp', 'idr', 'idf1']
+    calc_df = summary_df.copy()
+
+    overall_dic = {}
+    for col in add_col:
+        overall_dic[col] = calc_df[col].sum()
+
+    for col in calc_col:
+        overall_dic[col] = getattr(MCMOTMetricOverall, col + '_overall')(
+            calc_df, overall_dic)
+
+    overall_df = pd.DataFrame(overall_dic, index=['overall_calc'])
+    calc_df = pd.concat([calc_df, overall_df])
+
+    if verbose:
+        mh = mm.metrics.create()
+        str_calc_df = mm.io.render_summary(
+            calc_df, formatters=mh.formatters, namemap=NAME_MAP)
+        print(str_calc_df)
+
+    return calc_df
+
+
+class MCMOTMetricOverall(object):
+    def motp_overall(summary_df, overall_dic):
+        motp = quiet_divide((summary_df['motp'] *
+                             summary_df['num_detections']).sum(),
+                            overall_dic['num_detections'])
+        return motp
+
+    def mota_overall(summary_df, overall_dic):
+        del summary_df
+        mota = 1. - quiet_divide(
+            (overall_dic['num_misses'] + overall_dic['num_switches'] +
+             overall_dic['num_false_positives']), overall_dic['num_objects'])
+        return mota
+
+    def precision_overall(summary_df, overall_dic):
+        del summary_df
+        precision = quiet_divide(overall_dic['num_detections'], (
+            overall_dic['num_false_positives'] + overall_dic['num_detections']))
+        return precision
+
+    def recall_overall(summary_df, overall_dic):
+        del summary_df
+        recall = quiet_divide(overall_dic['num_detections'],
+                              overall_dic['num_objects'])
+        return recall
+
+    def idp_overall(summary_df, overall_dic):
+        del summary_df
+        idp = quiet_divide(overall_dic['idtp'],
+                           (overall_dic['idtp'] + overall_dic['idfp']))
+        return idp
+
+    def idr_overall(summary_df, overall_dic):
+        del summary_df
+        idr = quiet_divide(overall_dic['idtp'],
+                           (overall_dic['idtp'] + overall_dic['idfn']))
+        return idr
+
+    def idf1_overall(summary_df, overall_dic):
+        del summary_df
+        idf1 = quiet_divide(2. * overall_dic['idtp'], (
+            overall_dic['num_objects'] + overall_dic['num_predictions']))
+        return idf1
+
+
+def read_mcmot_results_union(filename, is_gt, is_ignore):
+    results_dict = dict()
+    if os.path.isfile(filename):
+        all_result = np.loadtxt(filename, delimiter=',')
+        if all_result.shape[0] == 0 or all_result.shape[1] < 7:
+            return results_dict
+        if is_ignore:
+            return results_dict
+        if is_gt:
+            # only for test use
+            all_result = all_result[all_result[:, 7] != 0]
+            all_result[:, 7] = all_result[:, 7] - 1
+
+        if all_result.shape[0] == 0:
+            return results_dict
+
+        class_unique = np.unique(all_result[:, 7])
+
+        last_max_id = 0
+        result_cls_list = []
+        for cls in class_unique:
+            result_cls_split = all_result[all_result[:, 7] == cls]
+            result_cls_split[:, 1] = result_cls_split[:, 1] + last_max_id
+            # make sure track id different between every category
+            last_max_id = max(np.unique(result_cls_split[:, 1])) + 1
+            result_cls_list.append(result_cls_split)
+
+        results_con = np.concatenate(result_cls_list)
+
+        for line in range(len(results_con)):
+            linelist = results_con[line]
+            fid = int(linelist[0])
+            if fid < 1:
+                continue
+            results_dict.setdefault(fid, list())
+
+            if is_gt:
+                score = 1
+            else:
+                score = float(linelist[6])
+
+            tlwh = tuple(map(float, linelist[2:6]))
+            target_id = int(linelist[1])
+            cls = int(linelist[7])
+
+            results_dict[fid].append((tlwh, target_id, cls, score))
+
+        return results_dict
+
+
+def read_mcmot_results(filename, is_gt, is_ignore):
+    results_dict = dict()
+    if os.path.isfile(filename):
+        with open(filename, 'r') as f:
+            for line in f.readlines():
+                linelist = line.strip().split(',')
+                if len(linelist) < 7:
+                    continue
+                fid = int(linelist[0])
+                if fid < 1:
+                    continue
+                cid = int(linelist[7])
+                if is_gt:
+                    score = 1
+                    # only for test use
+                    cid -= 1
+                else:
+                    score = float(linelist[6])
+
+                cls_result_dict = results_dict.setdefault(cid, dict())
+                cls_result_dict.setdefault(fid, list())
+
+                tlwh = tuple(map(float, linelist[2:6]))
+                target_id = int(linelist[1])
+                cls_result_dict[fid].append((tlwh, target_id, score))
+    return results_dict
+
+
+def read_results(filename,
+                 data_type,
+                 is_gt=False,
+                 is_ignore=False,
+                 multi_class=False,
+                 union=False):
+    if data_type in ['mcmot', 'lab']:
+        if multi_class:
+            if union:
+                # The results are evaluated by union all the categories.
+                # Track IDs between different categories cannot be duplicate.
+                read_fun = read_mcmot_results_union
+            else:
+                # The results are evaluated separately by category.
+                read_fun = read_mcmot_results
+        else:
+            raise ValueError('multi_class: {}, MCMOT should have cls_id.'.
+                             format(multi_class))
+    else:
+        raise ValueError('Unknown data type: {}'.format(data_type))
+
+    return read_fun(filename, is_gt, is_ignore)
+
+
+def unzip_objs(objs):
+    if len(objs) > 0:
+        tlwhs, ids, scores = zip(*objs)
+    else:
+        tlwhs, ids, scores = [], [], []
+    tlwhs = np.asarray(tlwhs, dtype=float).reshape(-1, 4)
+    return tlwhs, ids, scores
+
+
+def unzip_objs_cls(objs):
+    if len(objs) > 0:
+        tlwhs, ids, cls, scores = zip(*objs)
+    else:
+        tlwhs, ids, cls, scores = [], [], [], []
+    tlwhs = np.asarray(tlwhs, dtype=float).reshape(-1, 4)
+    ids = np.array(ids)
+    cls = np.array(cls)
+    scores = np.array(scores)
+    return tlwhs, ids, cls, scores
+
+
+class MCMOTEvaluator(object):
+    def __init__(self, data_root, seq_name, data_type, num_classes):
+        self.data_root = data_root
+        self.seq_name = seq_name
+        self.data_type = data_type
+        self.num_classes = num_classes
+
+        self.load_annotations()
+        self.reset_accumulator()
+
+        self.class_accs = []
+
+    def load_annotations(self):
+        assert self.data_type == 'mcmot'
+        self.gt_filename = os.path.join(self.data_root, '../', '../',
+                                        'sequences',
+                                        '{}.txt'.format(self.seq_name))
+
+    def reset_accumulator(self):
+        import motmetrics as mm
+        mm.lap.default_solver = 'lap'
+        self.acc = mm.MOTAccumulator(auto_id=True)
+
+    def eval_frame_dict(self, trk_objs, gt_objs, rtn_events=False, union=False):
+        import motmetrics as mm
+        mm.lap.default_solver = 'lap'
+        if union:
+            trk_tlwhs, trk_ids, trk_cls = unzip_objs_cls(trk_objs)[:3]
+            gt_tlwhs, gt_ids, gt_cls = unzip_objs_cls(gt_objs)[:3]
+
+            # get distance matrix
+            iou_distance = mm.distances.iou_matrix(
+                gt_tlwhs, trk_tlwhs, max_iou=0.5)
+
+            # Set the distance between objects of different categories to nan
+            gt_cls_len = len(gt_cls)
+            trk_cls_len = len(trk_cls)
+            # When the number of GT or Trk is 0, iou_distance dimension is (0,0)
+            if gt_cls_len != 0 and trk_cls_len != 0:
+                gt_cls = gt_cls.reshape(gt_cls_len, 1)
+                gt_cls = np.repeat(gt_cls, trk_cls_len, axis=1)
+                trk_cls = trk_cls.reshape(1, trk_cls_len)
+                trk_cls = np.repeat(trk_cls, gt_cls_len, axis=0)
+                iou_distance = np.where(gt_cls == trk_cls, iou_distance, np.nan)
+
+        else:
+            trk_tlwhs, trk_ids = unzip_objs(trk_objs)[:2]
+            gt_tlwhs, gt_ids = unzip_objs(gt_objs)[:2]
+
+            # get distance matrix
+            iou_distance = mm.distances.iou_matrix(
+                gt_tlwhs, trk_tlwhs, max_iou=0.5)
+
+        self.acc.update(gt_ids, trk_ids, iou_distance)
+
+        if rtn_events and iou_distance.size > 0 and hasattr(self.acc,
+                                                            'mot_events'):
+            events = self.acc.mot_events  # only supported by https://github.com/longcw/py-motmetrics
+        else:
+            events = None
+        return events
+
+    def eval_file(self, result_filename):
+        # evaluation of each category
+        gt_frame_dict = read_results(
+            self.gt_filename,
+            self.data_type,
+            is_gt=True,
+            multi_class=True,
+            union=False)
+        result_frame_dict = read_results(
+            result_filename,
+            self.data_type,
+            is_gt=False,
+            multi_class=True,
+            union=False)
+
+        for cid in range(self.num_classes):
+            self.reset_accumulator()
+            cls_result_frame_dict = result_frame_dict.setdefault(cid, dict())
+            cls_gt_frame_dict = gt_frame_dict.setdefault(cid, dict())
+
+            # only labeled frames will be evaluated
+            frames = sorted(list(set(cls_gt_frame_dict.keys())))
+
+            for frame_id in frames:
+                trk_objs = cls_result_frame_dict.get(frame_id, [])
+                gt_objs = cls_gt_frame_dict.get(frame_id, [])
+                self.eval_frame_dict(trk_objs, gt_objs, rtn_events=False)
+
+            self.class_accs.append(self.acc)
+
+        return self.class_accs
+
+    @staticmethod
+    def get_summary(accs,
+                    names,
+                    metrics=('mota', 'num_switches', 'idp', 'idr', 'idf1',
+                             'precision', 'recall')):
+        import motmetrics as mm
+        mm.lap.default_solver = 'lap'
+
+        names = copy.deepcopy(names)
+        if metrics is None:
+            metrics = mm.metrics.motchallenge_metrics
+        metrics = copy.deepcopy(metrics)
+
+        mh = mm.metrics.create()
+        summary = mh.compute_many(
+            accs, metrics=metrics, names=names, generate_overall=True)
+
+        return summary
+
+    @staticmethod
+    def save_summary(summary, filename):
+        import pandas as pd
+        writer = pd.ExcelWriter(filename)
+        summary.to_excel(writer)
+        writer.save()
+
+
+class MCMOTMetric(Metric):
+    def __init__(self, num_classes, save_summary=False):
+        self.num_classes = num_classes
+        self.save_summary = save_summary
+        self.MCMOTEvaluator = MCMOTEvaluator
+        self.result_root = None
+        self.reset()
+
+        self.seqs_overall = defaultdict(list)
+
+    def reset(self):
+        self.accs = []
+        self.seqs = []
+
+    def update(self, data_root, seq, data_type, result_root, result_filename):
+        evaluator = self.MCMOTEvaluator(data_root, seq, data_type,
+                                        self.num_classes)
+        seq_acc = evaluator.eval_file(result_filename)
+        self.accs.append(seq_acc)
+        self.seqs.append(seq)
+        self.result_root = result_root
+
+        cls_index_name = [
+            '{}_{}'.format(seq, i) for i in range(self.num_classes)
+        ]
+        summary = parse_accs_metrics(seq_acc, cls_index_name)
+        summary.rename(
+            index={'OVERALL': '{}_OVERALL'.format(seq)}, inplace=True)
+        for row in range(len(summary)):
+            self.seqs_overall[row].append(summary.iloc[row:row + 1])
+
+    def accumulate(self):
+        self.cls_summary_list = []
+        for row in range(self.num_classes):
+            seqs_cls_df = pd.concat(self.seqs_overall[row])
+            seqs_cls_summary = seqs_overall_metrics(seqs_cls_df)
+            cls_summary_overall = seqs_cls_summary.iloc[-1:].copy()
+            cls_summary_overall.rename(
+                index={'overall_calc': 'overall_calc_{}'.format(row)},
+                inplace=True)
+            self.cls_summary_list.append(cls_summary_overall)
+
+    def log(self):
+        seqs_summary = seqs_overall_metrics(
+            pd.concat(self.seqs_overall[self.num_classes]), verbose=True)
+        class_summary = seqs_overall_metrics(
+            pd.concat(self.cls_summary_list), verbose=True)
+
+    def get_results(self):
+        return 1

ppdet/modeling/architectures/centernet.py

@@ -79,7 +79,7 @@ class CenterNet(BaseArch):
     def get_pred(self):
         head_out = self._forward()
         if self.for_mot:
-            bbox, bbox_inds = self.post_process(
+            bbox, bbox_inds, topk_clses = self.post_process(
                 head_out['heatmap'],
                 head_out['size'],
                 head_out['offset'],
@@ -88,10 +88,11 @@ class CenterNet(BaseArch):
             output = {
                 "bbox": bbox,
                 "bbox_inds": bbox_inds,
+                "topk_clses": topk_clses,
                 "neck_feat": head_out['neck_feat']
             }
         else:
-            bbox, bbox_num = self.post_process(
+            bbox, bbox_num, _ = self.post_process(
                 head_out['heatmap'],
                 head_out['size'],
                 head_out['offset'],

ppdet/modeling/architectures/fairmot.py

@@ -86,13 +86,9 @@ class FairMOT(BaseArch):
             loss.update({'reid_loss': reid_loss})
             return loss
         else:
-            embedding = self.reid(neck_feat, self.inputs)
-            bbox_inds = det_outs['bbox_inds']
-            embedding = paddle.transpose(embedding, [0, 2, 3, 1])
-            embedding = paddle.reshape(embedding,
-                                       [-1, paddle.shape(embedding)[-1]])
-            pred_embs = paddle.gather(embedding, bbox_inds)
-            pred_dets = det_outs['bbox']
+            pred_dets, pred_embs = self.reid(
+                neck_feat, self.inputs, det_outs['bbox'], det_outs['bbox_inds'],
+                det_outs['topk_clses'])
             return pred_dets, pred_embs
 
     def get_pred(self):

ppdet/modeling/heads/centernet_head.py

@@ -59,7 +59,7 @@ class CenterNetHead(nn.Layer):
     """
     Args:
         in_channels (int): the channel number of input to CenterNetHead.
-        num_classes (int): the number of classes, 80 by default.
+        num_classes (int): the number of classes, 80 (COCO dataset) by default.
         head_planes (int): the channel number in all head, 256 by default.
         heatmap_weight (float): the weight of heatmap loss, 1 by default.
         regress_ltrb (bool): whether to regress left/top/right/bottom or
@@ -83,6 +83,7 @@ class CenterNetHead(nn.Layer):
                  offset_weight=1,
                  iou_weight=0):
         super(CenterNetHead, self).__init__()
+        self.regress_ltrb = regress_ltrb
         self.weights = {
             'heatmap': heatmap_weight,
             'size': size_weight,
@@ -196,7 +197,14 @@ class CenterNetHead(nn.Layer):
         pos_num = size_mask.sum()
         size_mask.stop_gradient = True
         if self.size_loss == 'L1':
+            if self.regress_ltrb:
                 size_target = inputs['size']
+                # shape: [bs, max_per_img, 4]
+            else:
+                size_target = inputs['size'][:, :, 0:2] + inputs['size'][:, :,
+                                                                         2:]
+                # shape: [bs, max_per_img, 2]
+
             size_target.stop_gradient = True
             size_loss = F.l1_loss(
                 pos_size * size_mask, size_target * size_mask, reduction='sum')

ppdet/modeling/mot/tracker/base_jde_tracker.py

@@ -11,11 +11,9 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-"""
-This code is borrow from https://github.com/Zhongdao/Towards-Realtime-MOT/blob/master/tracker/multitracker.py
-"""
 
 import numpy as np
+from collections import defaultdict
 from collections import deque, OrderedDict
 from ..matching import jde_matching as matching
 from ppdet.core.workspace import register, serializable
@@ -40,7 +38,7 @@ class TrackState(object):
 @register
 @serializable
 class BaseTrack(object):
-    _count = 0
+    _count_dict = defaultdict(int)  # support single class and multi classes
 
     track_id = 0
     is_activated = False
@@ -62,9 +60,23 @@ class BaseTrack(object):
         return self.frame_id
 
     @staticmethod
-    def next_id():
-        BaseTrack._count += 1
-        return BaseTrack._count
+    def next_id(cls_id):
+        BaseTrack._count_dict[cls_id] += 1
+        return BaseTrack._count_dict[cls_id]
+
+    # @even: reset track id
+    @staticmethod
+    def init_count(num_classes):
+        """
+        Initiate _count for all object classes
+        :param num_classes:
+        """
+        for cls_id in range(num_classes):
+            BaseTrack._count_dict[cls_id] = 0
+
+    @staticmethod
+    def reset_track_count(cls_id):
+        BaseTrack._count_dict[cls_id] = 0
 
     def activate(self, *args):
         raise NotImplementedError
@@ -85,7 +97,15 @@ class BaseTrack(object):
 @register
 @serializable
 class STrack(BaseTrack):
-    def __init__(self, tlwh, score, temp_feat, buffer_size=30):
+    def __init__(self,
+                 tlwh,
+                 score,
+                 temp_feat,
+                 num_classes,
+                 cls_id,
+                 buff_size=30):
+        # object class id
+        self.cls_id = cls_id
         # wait activate
         self._tlwh = np.asarray(tlwh, dtype=np.float)
         self.kalman_filter = None
@@ -93,20 +113,21 @@ class STrack(BaseTrack):
         self.is_activated = False
 
         self.score = score
-        self.tracklet_len = 0
+        self.track_len = 0
 
         self.smooth_feat = None
         self.update_features(temp_feat)
-        self.features = deque([], maxlen=buffer_size)
+        self.features = deque([], maxlen=buff_size)
         self.alpha = 0.9
 
     def update_features(self, feat):
+        # L2 normalizing
         feat /= np.linalg.norm(feat)
         self.curr_feat = feat
         if self.smooth_feat is None:
             self.smooth_feat = feat
         else:
-            self.smooth_feat = self.alpha * self.smooth_feat + (1 - self.alpha
+            self.smooth_feat = self.alpha * self.smooth_feat + (1.0 - self.alpha
                                                                 ) * feat
         self.features.append(feat)
         self.smooth_feat /= np.linalg.norm(self.smooth_feat)
@@ -119,54 +140,60 @@ class STrack(BaseTrack):
                                                                 self.covariance)
 
     @staticmethod
-    def multi_predict(stracks, kalman_filter):
-        if len(stracks) > 0:
-            multi_mean = np.asarray([st.mean.copy() for st in stracks])
-            multi_covariance = np.asarray([st.covariance for st in stracks])
-            for i, st in enumerate(stracks):
+    def multi_predict(tracks, kalman_filter):
+        if len(tracks) > 0:
+            multi_mean = np.asarray([track.mean.copy() for track in tracks])
+            multi_covariance = np.asarray(
+                [track.covariance for track in tracks])
+            for i, st in enumerate(tracks):
                 if st.state != TrackState.Tracked:
                     multi_mean[i][7] = 0
             multi_mean, multi_covariance = kalman_filter.multi_predict(
                 multi_mean, multi_covariance)
             for i, (mean, cov) in enumerate(zip(multi_mean, multi_covariance)):
-                stracks[i].mean = mean
-                stracks[i].covariance = cov
+                tracks[i].mean = mean
+                tracks[i].covariance = cov
+
+    def reset_track_id(self):
+        self.reset_track_count(self.cls_id)
 
     def activate(self, kalman_filter, frame_id):
-        """Start a new tracklet"""
+        """Start a new track"""
         self.kalman_filter = kalman_filter
-        self.track_id = self.next_id()
+        # update track id for the object class
+        self.track_id = self.next_id(self.cls_id)
         self.mean, self.covariance = self.kalman_filter.initiate(
             self.tlwh_to_xyah(self._tlwh))
 
-        self.tracklet_len = 0
-        self.state = TrackState.Tracked
-        if frame_id == 1:
+        self.track_len = 0
+        self.state = TrackState.Tracked  # set flag 'tracked'
+
+        if frame_id == 1:  # to record the first frame's detection result
             self.is_activated = True
+
         self.frame_id = frame_id
         self.start_frame = frame_id
 
     def re_activate(self, new_track, frame_id, new_id=False):
         self.mean, self.covariance = self.kalman_filter.update(
             self.mean, self.covariance, self.tlwh_to_xyah(new_track.tlwh))
-
         self.update_features(new_track.curr_feat)
-        self.tracklet_len = 0
+        self.track_len = 0
         self.state = TrackState.Tracked
         self.is_activated = True
         self.frame_id = frame_id
-        if new_id:
-            self.track_id = self.next_id()
+        if new_id:  # update track id for the object class
+            self.track_id = self.next_id(self.cls_id)
 
     def update(self, new_track, frame_id, update_feature=True):
         self.frame_id = frame_id
-        self.tracklet_len += 1
+        self.track_len += 1
 
         new_tlwh = new_track.tlwh
         self.mean, self.covariance = self.kalman_filter.update(
             self.mean, self.covariance, self.tlwh_to_xyah(new_tlwh))
-        self.state = TrackState.Tracked
-        self.is_activated = True
+        self.state = TrackState.Tracked  # set flag 'tracked'
+        self.is_activated = True  # set flag 'activated'
 
         self.score = new_track.score
         if update_feature:
@@ -174,12 +201,12 @@ class STrack(BaseTrack):
 
     @property
     def tlwh(self):
-        """
-        Get current position in bounding box format `(top left x, top left y,
+        """Get current position in bounding box format `(top left x, top left y,
                 width, height)`.
         """
         if self.mean is None:
             return self._tlwh.copy()
+
         ret = self.mean[:4].copy()
         ret[2] *= ret[3]
         ret[:2] -= ret[2:] / 2
@@ -187,8 +214,7 @@ class STrack(BaseTrack):
 
     @property
     def tlbr(self):
-        """
-        Convert bounding box to format `(min x, min y, max x, max y)`, i.e.,
+        """Convert bounding box to format `(min x, min y, max x, max y)`, i.e.,
         `(top left, bottom right)`.
         """
         ret = self.tlwh.copy()
@@ -197,8 +223,7 @@ class STrack(BaseTrack):
 
     @staticmethod
     def tlwh_to_xyah(tlwh):
-        """
-        Convert bounding box to format `(center x, center y, aspect ratio,
+        """Convert bounding box to format `(center x, center y, aspect ratio,
         height)`, where the aspect ratio is `width / height`.
         """
         ret = np.asarray(tlwh).copy()
@@ -222,8 +247,8 @@ class STrack(BaseTrack):
         return ret
 
     def __repr__(self):
-        return 'OT_{}_({}-{})'.format(self.track_id, self.start_frame,
-                                      self.end_frame)
+        return 'OT_({}-{})_({}-{})'.format(self.cls_id, self.track_id,
+                                           self.start_frame, self.end_frame)
 
 
 def joint_stracks(tlista, tlistb):

ppdet/modeling/mot/tracker/jde_tracker.py

@@ -12,13 +12,16 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 """
-This code is borrow from https://github.com/Zhongdao/Towards-Realtime-MOT/blob/master/tracker/multitracker.py
+This code is based on https://github.com/Zhongdao/Towards-Realtime-MOT/blob/master/tracker/multitracker.py
 """
 
+import numpy as np
+from collections import defaultdict
 import paddle
 
 from ..matching import jde_matching as matching
-from .base_jde_tracker import TrackState, BaseTrack, STrack
+from ..motion import KalmanFilter
+from .base_jde_tracker import TrackState, STrack
 from .base_jde_tracker import joint_stracks, sub_stracks, remove_duplicate_stracks
 
 from ppdet.core.workspace import register, serializable
@@ -31,30 +34,32 @@ __all__ = ['JDETracker']
 @register
 @serializable
 class JDETracker(object):
-    __inject__ = ['motion']
+    __shared__ = ['num_classes']
     """
-    JDE tracker
+    JDE tracker, support single class and multi classes
 
     Args:
+        num_classes (int): the number of classes
         det_thresh (float): threshold of detection score
         track_buffer (int): buffer for tracker
         min_box_area (int): min box area to filter out low quality boxes
         vertical_ratio (float): w/h, the vertical ratio of the bbox to filter
-            bad results, set 1.6 default for pedestrian tracking. If set -1 
-            means no need to filter bboxes.
+            bad results. If set <0 means no need to filter bboxes，usually set
+            1.6 for pedestrian tracking.
         tracked_thresh (float): linear assignment threshold of tracked 
             stracks and detections
         r_tracked_thresh (float): linear assignment threshold of 
             tracked stracks and unmatched detections
         unconfirmed_thresh (float): linear assignment threshold of 
             unconfirmed stracks and unmatched detections
-        motion (object): KalmanFilter instance
+        motion (str): motion model, KalmanFilter as default
         conf_thres (float): confidence threshold for tracking
         metric_type (str): either "euclidean" or "cosine", the distance metric 
             used for measurement to track association.
     """
 
     def __init__(self,
+                 num_classes=1,
                  det_thresh=0.3,
                  track_buffer=30,
                  min_box_area=200,
@@ -65,6 +70,7 @@ class JDETracker(object):
                  motion='KalmanFilter',
                  conf_thres=0,
                  metric_type='euclidean'):
+        self.num_classes = num_classes
         self.det_thresh = det_thresh
         self.track_buffer = track_buffer
         self.min_box_area = min_box_area
@@ -73,14 +79,15 @@ class JDETracker(object):
         self.tracked_thresh = tracked_thresh
         self.r_tracked_thresh = r_tracked_thresh
         self.unconfirmed_thresh = unconfirmed_thresh
-        self.motion = motion
+        if motion == 'KalmanFilter':
+            self.motion = KalmanFilter()
         self.conf_thres = conf_thres
         self.metric_type = metric_type
 
         self.frame_id = 0
-        self.tracked_stracks = []
-        self.lost_stracks = []
-        self.removed_stracks = []
+        self.tracked_tracks_dict = defaultdict(list)  # dict(list[STrack])
+        self.lost_tracks_dict = defaultdict(list)  # dict(list[STrack])
+        self.removed_tracks_dict = defaultdict(list)  # dict(list[STrack])
 
         self.max_time_lost = 0
         # max_time_lost will be calculated: int(frame_rate / 30.0 * track_buffer)
@@ -92,175 +99,176 @@ class JDETracker(object):
             lost, removed, refound and active tracklets.
 
         Args:
-            pred_dets (Tensor): Detection results of the image, shape is [N, 5].
-            pred_embs (Tensor): Embedding results of the image, shape is [N, 512].
+            pred_dets (np.array): Detection results of the image, the shape is
+                [N, 6], means 'x0, y0, x1, y1, score, cls_id'.
+            pred_embs (np.array): Embedding results of the image, the shape is
+                [N, 128] or [N, 512].
 
         Return:
-            output_stracks (list): The list contains information regarding the
-                online_tracklets for the recieved image tensor.
+            output_stracks_dict (dict(list)): The list contains information
+                regarding the online_tracklets for the recieved image tensor.
         """
         self.frame_id += 1
-        activated_starcks = []
-        # for storing active tracks, for the current frame
-        refind_stracks = []
-        # Lost Tracks whose detections are obtained in the current frame
-        lost_stracks = []
-        # The tracks which are not obtained in the current frame but are not 
-        # removed. (Lost for some time lesser than the threshold for removing)
-        removed_stracks = []
+        if self.frame_id == 1:
+            STrack.init_count(self.num_classes)
+        activated_tracks_dict = defaultdict(list)
+        refined_tracks_dict = defaultdict(list)
+        lost_tracks_dict = defaultdict(list)
+        removed_tracks_dict = defaultdict(list)
+        output_tracks_dict = defaultdict(list)
 
-        remain_inds = paddle.nonzero(pred_dets[:, 4] > self.conf_thres)
-        if remain_inds.shape[0] == 0:
-            pred_dets = paddle.zeros([0, 1])
-            pred_embs = paddle.zeros([0, 1])
-        else:
-            pred_dets = paddle.gather(pred_dets, remain_inds)
-            pred_embs = paddle.gather(pred_embs, remain_inds)
+        pred_dets_dict = defaultdict(list)
+        pred_embs_dict = defaultdict(list)
+
+        # unify single and multi classes detection and embedding results
+        for cls_id in range(self.num_classes):
+            cls_idx = (pred_dets[:, 5:] == cls_id).squeeze(-1)
+            pred_dets_dict[cls_id] = pred_dets[cls_idx]
+            pred_embs_dict[cls_id] = pred_embs[cls_idx]
 
-        # Filter out the image with box_num = 0. pred_dets = [[0.0, 0.0, 0.0 ,0.0]]
-        empty_pred = True if len(pred_dets) == 1 and paddle.sum(
-            pred_dets) == 0.0 else False
-        """ Step 1: Network forward, get detections & embeddings"""
-        if len(pred_dets) > 0 and not empty_pred:
-            pred_dets = pred_dets.numpy()
-            pred_embs = pred_embs.numpy()
+        for cls_id in range(self.num_classes):
+            """ Step 1: Get detections by class"""
+            pred_dets_cls = pred_dets_dict[cls_id]
+            pred_embs_cls = pred_embs_dict[cls_id]
+            remain_inds = (pred_dets_cls[:, 4:5] > self.conf_thres).squeeze(-1)
+            if remain_inds.sum() > 0:
+                pred_dets_cls = pred_dets_cls[remain_inds]
+                pred_embs_cls = pred_embs_cls[remain_inds]
                 detections = [
-                STrack(STrack.tlbr_to_tlwh(tlbrs[:4]), tlbrs[4], f, 30)
-                for (tlbrs, f) in zip(pred_dets, pred_embs)
+                    STrack(
+                        STrack.tlbr_to_tlwh(tlbrs[:4]), tlbrs[4], f,
+                        self.num_classes, cls_id, 30)
+                    for (tlbrs, f) in zip(pred_dets_cls, pred_embs_cls)
                 ]
             else:
                 detections = []
             ''' Add newly detected tracklets to tracked_stracks'''
-        unconfirmed = []
-        tracked_stracks = []  # type: list[STrack]
-        for track in self.tracked_stracks:
+            unconfirmed_dict = defaultdict(list)
+            tracked_tracks_dict = defaultdict(list)
+            for track in self.tracked_tracks_dict[cls_id]:
                 if not track.is_activated:
                     # previous tracks which are not active in the current frame are added in unconfirmed list
-                unconfirmed.append(track)
+                    unconfirmed_dict[cls_id].append(track)
                 else:
                     # Active tracks are added to the local list 'tracked_stracks'
-                tracked_stracks.append(track)
+                    tracked_tracks_dict[cls_id].append(track)
             """ Step 2: First association, with embedding"""
-        # Combining currently tracked_stracks and lost_stracks
-        strack_pool = joint_stracks(tracked_stracks, self.lost_stracks)
-        # Predict the current location with KF
-        STrack.multi_predict(strack_pool, self.motion)
+            # building tracking pool for the current frame
+            track_pool_dict = defaultdict(list)
+            track_pool_dict[cls_id] = joint_stracks(
+                tracked_tracks_dict[cls_id], self.lost_tracks_dict[cls_id])
+
+            # Predict the current location with KalmanFilter
+            STrack.multi_predict(track_pool_dict[cls_id], self.motion)
 
             dists = matching.embedding_distance(
-            strack_pool, detections, metric=self.metric_type)
-        dists = matching.fuse_motion(self.motion, dists, strack_pool,
-                                     detections)
-        # The dists is the list of distances of the detection with the tracks in strack_pool
+                track_pool_dict[cls_id], detections, metric=self.metric_type)
+            dists = matching.fuse_motion(self.motion, dists,
+                                         track_pool_dict[cls_id], detections)
             matches, u_track, u_detection = matching.linear_assignment(
                 dists, thresh=self.tracked_thresh)
-        # The matches is the array for corresponding matches of the detection with the corresponding strack_pool
 
-        for itracked, idet in matches:
-            # itracked is the id of the track and idet is the detection
-            track = strack_pool[itracked]
+            for i_tracked, idet in matches:
+                # i_tracked is the id of the track and idet is the detection
+                track = track_pool_dict[cls_id][i_tracked]
                 det = detections[idet]
                 if track.state == TrackState.Tracked:
                     # If the track is active, add the detection to the track
                     track.update(detections[idet], self.frame_id)
-                activated_starcks.append(track)
+                    activated_tracks_dict[cls_id].append(track)
                 else:
                     # We have obtained a detection from a track which is not active,
                     # hence put the track in refind_stracks list
                     track.re_activate(det, self.frame_id, new_id=False)
-                refind_stracks.append(track)
+                    refined_tracks_dict[cls_id].append(track)
 
             # None of the steps below happen if there are no undetected tracks.
             """ Step 3: Second association, with IOU"""
             detections = [detections[i] for i in u_detection]
-        # detections is now a list of the unmatched detections
             r_tracked_stracks = []
-        # This is container for stracks which were tracked till the previous
-        # frame but no detection was found for it in the current frame.
-
             for i in u_track:
-            if strack_pool[i].state == TrackState.Tracked:
-                r_tracked_stracks.append(strack_pool[i])
+                if track_pool_dict[cls_id][i].state == TrackState.Tracked:
+                    r_tracked_stracks.append(track_pool_dict[cls_id][i])
+
             dists = matching.iou_distance(r_tracked_stracks, detections)
             matches, u_track, u_detection = matching.linear_assignment(
                 dists, thresh=self.r_tracked_thresh)
-        # matches is the list of detections which matched with corresponding
-        # tracks by IOU distance method.
 
-        for itracked, idet in matches:
-            track = r_tracked_stracks[itracked]
+            for i_tracked, idet in matches:
+                track = r_tracked_stracks[i_tracked]
                 det = detections[idet]
                 if track.state == TrackState.Tracked:
                     track.update(det, self.frame_id)
-                activated_starcks.append(track)
+                    activated_tracks_dict[cls_id].append(track)
                 else:
                     track.re_activate(det, self.frame_id, new_id=False)
-                refind_stracks.append(track)
-        # Same process done for some unmatched detections, but now considering IOU_distance as measure
+                    refined_tracks_dict[cls_id].append(track)
 
             for it in u_track:
                 track = r_tracked_stracks[it]
                 if not track.state == TrackState.Lost:
                     track.mark_lost()
-                lost_stracks.append(track)
-        # If no detections are obtained for tracks (u_track), the tracks are added to lost_tracks list and are marked lost
+                    lost_tracks_dict[cls_id].append(track)
             '''Deal with unconfirmed tracks, usually tracks with only one beginning frame'''
             detections = [detections[i] for i in u_detection]
-        dists = matching.iou_distance(unconfirmed, detections)
+            dists = matching.iou_distance(unconfirmed_dict[cls_id], detections)
             matches, u_unconfirmed, u_detection = matching.linear_assignment(
                 dists, thresh=self.unconfirmed_thresh)
-        for itracked, idet in matches:
-            unconfirmed[itracked].update(detections[idet], self.frame_id)
-            activated_starcks.append(unconfirmed[itracked])
-
-        # The tracks which are yet not matched
+            for i_tracked, idet in matches:
+                unconfirmed_dict[cls_id][i_tracked].update(detections[idet],
+                                                           self.frame_id)
+                activated_tracks_dict[cls_id].append(unconfirmed_dict[cls_id][
+                    i_tracked])
             for it in u_unconfirmed:
-            track = unconfirmed[it]
+                track = unconfirmed_dict[cls_id][it]
                 track.mark_removed()
-            removed_stracks.append(track)
-
-        # after all these confirmation steps, if a new detection is found, it is initialized for a new track
+                removed_tracks_dict[cls_id].append(track)
             """ Step 4: Init new stracks"""
             for inew in u_detection:
                 track = detections[inew]
                 if track.score < self.det_thresh:
                     continue
                 track.activate(self.motion, self.frame_id)
-            activated_starcks.append(track)
+                activated_tracks_dict[cls_id].append(track)
             """ Step 5: Update state"""
-        # If the tracks are lost for more frames than the threshold number, the tracks are removed.
-        for track in self.lost_stracks:
+            for track in self.lost_tracks_dict[cls_id]:
                 if self.frame_id - track.end_frame > self.max_time_lost:
                     track.mark_removed()
-                removed_stracks.append(track)
+                    removed_tracks_dict[cls_id].append(track)
 
-        # Update the self.tracked_stracks and self.lost_stracks using the updates in this step.
-        self.tracked_stracks = [
-            t for t in self.tracked_stracks if t.state == TrackState.Tracked
+            self.tracked_tracks_dict[cls_id] = [
+                t for t in self.tracked_tracks_dict[cls_id]
+                if t.state == TrackState.Tracked
             ]
-        self.tracked_stracks = joint_stracks(self.tracked_stracks,
-                                             activated_starcks)
-        self.tracked_stracks = joint_stracks(self.tracked_stracks,
-                                             refind_stracks)
+            self.tracked_tracks_dict[cls_id] = joint_stracks(
+                self.tracked_tracks_dict[cls_id], activated_tracks_dict[cls_id])
+            self.tracked_tracks_dict[cls_id] = joint_stracks(
+                self.tracked_tracks_dict[cls_id], refined_tracks_dict[cls_id])
+            self.lost_tracks_dict[cls_id] = sub_stracks(
+                self.lost_tracks_dict[cls_id], self.tracked_tracks_dict[cls_id])
+            self.lost_tracks_dict[cls_id].extend(lost_tracks_dict[cls_id])
+            self.lost_tracks_dict[cls_id] = sub_stracks(
+                self.lost_tracks_dict[cls_id], self.removed_tracks_dict[cls_id])
+            self.removed_tracks_dict[cls_id].extend(removed_tracks_dict[cls_id])
+            self.tracked_tracks_dict[cls_id], self.lost_tracks_dict[
+                cls_id] = remove_duplicate_stracks(
+                    self.tracked_tracks_dict[cls_id],
+                    self.lost_tracks_dict[cls_id])
 
-        self.lost_stracks = sub_stracks(self.lost_stracks, self.tracked_stracks)
-        self.lost_stracks.extend(lost_stracks)
-        self.lost_stracks = sub_stracks(self.lost_stracks, self.removed_stracks)
-        self.removed_stracks.extend(removed_stracks)
-        self.tracked_stracks, self.lost_stracks = remove_duplicate_stracks(
-            self.tracked_stracks, self.lost_stracks)
             # get scores of lost tracks
-        output_stracks = [
-            track for track in self.tracked_stracks if track.is_activated
+            output_tracks_dict[cls_id] = [
+                track for track in self.tracked_tracks_dict[cls_id]
+                if track.is_activated
             ]
 
             logger.debug('===========Frame {}=========='.format(self.frame_id))
             logger.debug('Activated: {}'.format(
-            [track.track_id for track in activated_starcks]))
+                [track.track_id for track in activated_tracks_dict[cls_id]]))
             logger.debug('Refind: {}'.format(
-            [track.track_id for track in refind_stracks]))
+                [track.track_id for track in refined_tracks_dict[cls_id]]))
             logger.debug('Lost: {}'.format(
-            [track.track_id for track in lost_stracks]))
+                [track.track_id for track in lost_tracks_dict[cls_id]]))
             logger.debug('Removed: {}'.format(
-            [track.track_id for track in removed_stracks]))
+                [track.track_id for track in removed_tracks_dict[cls_id]]))
 
-        return output_stracks
+        return output_tracks_dict

ppdet/modeling/mot/utils.py

@@ -17,10 +17,13 @@ import cv2
 import time
 import paddle
 import numpy as np
+from .visualization import plot_tracking_dict
 
 __all__ = [
-    'Timer',
+    'MOTTimer',
     'Detection',
+    'write_mot_results',
+    'save_vis_results',
     'load_det_results',
     'preprocess_reid',
     'get_crops',
@@ -29,7 +32,7 @@ __all__ = [
 ]
 
 
-class Timer(object):
+class MOTTimer(object):
     """
     This class used to compute and print the current FPS while evaling.
     """
@@ -106,6 +109,68 @@ class Detection(object):
         return ret
 
 
+def write_mot_results(filename, results, data_type='mot', num_classes=1):
+    # support single and multi classes
+    if data_type in ['mot', 'mcmot']:
+        save_format = '{frame},{id},{x1},{y1},{w},{h},{score},{cls_id},-1,-1\n'
+    elif data_type == 'kitti':
+        save_format = '{frame} {id} car 0 0 -10 {x1} {y1} {x2} {y2} -10 -10 -10 -1000 -1000 -1000 -10\n'
+    else:
+        raise ValueError(data_type)
+
+    f = open(filename, 'w')
+    for cls_id in range(num_classes):
+        for frame_id, tlwhs, tscores, track_ids in results[cls_id]:
+            for tlwh, score, track_id in zip(tlwhs, tscores, track_ids):
+                if track_id < 0: continue
+                if data_type == 'kitti':
+                    frame_id -= 1
+                elif data_type == 'mot':
+                    cls_id = -1
+                elif data_type == 'mcmot':
+                    cls_id = cls_id
+
+                x1, y1, w, h = tlwh
+                line = save_format.format(
+                    frame=frame_id,
+                    id=track_id,
+                    x1=x1,
+                    y1=y1,
+                    w=w,
+                    h=h,
+                    score=score,
+                    cls_id=cls_id)
+                f.write(line)
+    print('MOT results save in {}'.format(filename))
+
+
+def save_vis_results(data,
+                     frame_id,
+                     online_ids,
+                     online_tlwhs,
+                     online_scores,
+                     average_time,
+                     show_image,
+                     save_dir,
+                     num_classes=1):
+    if show_image or save_dir is not None:
+        assert 'ori_image' in data
+        img0 = data['ori_image'].numpy()[0]
+        online_im = plot_tracking_dict(
+            img0,
+            num_classes,
+            online_tlwhs,
+            online_ids,
+            online_scores,
+            frame_id=frame_id,
+            fps=1. / average_time)
+    if show_image:
+        cv2.imshow('online_im', online_im)
+    if save_dir is not None:
+        cv2.imwrite(
+            os.path.join(save_dir, '{:05d}.jpg'.format(frame_id)), online_im)
+
+
 def load_det_results(det_file, num_frames):
     assert os.path.exists(det_file) and os.path.isfile(det_file), \
         '{} is not exist or not a file.'.format(det_file)

ppdet/modeling/mot/visualization.py

@@ -16,28 +16,12 @@ import cv2
 import numpy as np
 
 
-def tlwhs_to_tlbrs(tlwhs):
-    tlbrs = np.copy(tlwhs)
-    if len(tlbrs) == 0:
-        return tlbrs
-    tlbrs[:, 2] += tlwhs[:, 0]
-    tlbrs[:, 3] += tlwhs[:, 1]
-    return tlbrs
-
-
 def get_color(idx):
     idx = idx * 3
     color = ((37 * idx) % 255, (17 * idx) % 255, (29 * idx) % 255)
     return color
 
 
-def resize_image(image, max_size=800):
-    if max(image.shape[:2]) > max_size:
-        scale = float(max_size) / max(image.shape[:2])
-        image = cv2.resize(image, None, fx=scale, fy=scale)
-    return image
-
-
 def plot_tracking(image,
                   tlwhs,
                   obj_ids,
@@ -92,44 +76,67 @@ def plot_tracking(image,
     return im
 
 
-def plot_trajectory(image, tlwhs, track_ids):
-    image = image.copy()
-    for one_tlwhs, track_id in zip(tlwhs, track_ids):
-        color = get_color(int(track_id))
-        for tlwh in one_tlwhs:
-            x1, y1, w, h = tuple(map(int, tlwh))
-            cv2.circle(
-                image, (int(x1 + 0.5 * w), int(y1 + h)), 2, color, thickness=2)
-    return image
-
-
-def plot_detections(image, tlbrs, scores=None, color=(255, 0, 0), ids=None):
-    im = np.copy(image)
-    text_scale = max(1, image.shape[1] / 800.)
-    thickness = 2 if text_scale > 1.3 else 1
-    for i, det in enumerate(tlbrs):
-        x1, y1, x2, y2 = np.asarray(det[:4], dtype=np.int)
-        if len(det) >= 7:
-            label = 'det' if det[5] > 0 else 'trk'
-            if ids is not None:
-                text = '{}# {:.2f}: {:d}'.format(label, det[6], ids[i])
+def plot_tracking_dict(image,
+                       num_classes,
+                       tlwhs_dict,
+                       obj_ids_dict,
+                       scores_dict,
+                       frame_id=0,
+                       fps=0.,
+                       ids2=None):
+    im = np.ascontiguousarray(np.copy(image))
+    im_h, im_w = im.shape[:2]
+
+    top_view = np.zeros([im_w, im_w, 3], dtype=np.uint8) + 255
+
+    text_scale = max(1, image.shape[1] / 1600.)
+    text_thickness = 2
+    line_thickness = max(1, int(image.shape[1] / 500.))
+
+    radius = max(5, int(im_w / 140.))
+
+    for cls_id in range(num_classes):
+        tlwhs = tlwhs_dict[cls_id]
+        obj_ids = obj_ids_dict[cls_id]
+        scores = scores_dict[cls_id]
         cv2.putText(
             im,
-                    text, (x1, y1 + 30),
+            'frame: %d fps: %.2f num: %d' % (frame_id, fps, len(tlwhs)),
+            (0, int(15 * text_scale)),
             cv2.FONT_HERSHEY_PLAIN,
-                    text_scale, (0, 255, 255),
-                    thickness=thickness)
+            text_scale, (0, 0, 255),
+            thickness=2)
+
+        for i, tlwh in enumerate(tlwhs):
+            x1, y1, w, h = tlwh
+            intbox = tuple(map(int, (x1, y1, x1 + w, y1 + h)))
+            obj_id = int(obj_ids[i])
+            if num_classes == 1:
+                id_text = '{}'.format(int(obj_id))
             else:
-                text = '{}# {:.2f}'.format(label, det[6])
+                id_text = 'class{}_id{}'.format(cls_id, int(obj_id))
+
+            _line_thickness = 1 if obj_id <= 0 else line_thickness
+            color = get_color(abs(obj_id))
+            cv2.rectangle(
+                im,
+                intbox[0:2],
+                intbox[2:4],
+                color=color,
+                thickness=line_thickness)
+            cv2.putText(
+                im,
+                id_text, (intbox[0], intbox[1] + 10),
+                cv2.FONT_HERSHEY_PLAIN,
+                text_scale, (0, 0, 255),
+                thickness=text_thickness)
 
             if scores is not None:
-            text = '{:.2f}'.format(scores[i])
+                text = '{:.2f}'.format(float(scores[i]))
                 cv2.putText(
                     im,
-                text, (x1, y1 + 30),
+                    text, (intbox[0], intbox[1] - 10),
                     cv2.FONT_HERSHEY_PLAIN,
                     text_scale, (0, 255, 255),
-                thickness=thickness)
-
-        cv2.rectangle(im, (x1, y1), (x2, y2), color, 2)
+                    thickness=text_thickness)
     return im

ppdet/modeling/post_process.py

@@ -422,7 +422,6 @@ class CenterNetPostProcess(TTFBox):
         regress_ltrb (bool): whether to regress left/top/right/bottom or
             width/height for a box, true by default.
         for_mot (bool): whether return other features used in tracking model.
-
     """
 
     __shared__ = ['down_ratio', 'for_mot']
@@ -440,9 +439,9 @@ class CenterNetPostProcess(TTFBox):
 
     def __call__(self, hm, wh, reg, im_shape, scale_factor):
         heat = self._simple_nms(hm)
-        scores, inds, clses, ys, xs = self._topk(heat)
+        scores, inds, topk_clses, ys, xs = self._topk(heat)
         scores = paddle.tensor.unsqueeze(scores, [1])
-        clses = paddle.tensor.unsqueeze(clses, [1])
+        clses = paddle.tensor.unsqueeze(topk_clses, [1])
 
         reg_t = paddle.transpose(reg, [0, 2, 3, 1])
         # Like TTFBox, batch size is 1.
@@ -493,10 +492,10 @@ class CenterNetPostProcess(TTFBox):
         bboxes = paddle.divide(bboxes, scale_expand)
         if self.for_mot:
             results = paddle.concat([bboxes, scores, clses], axis=1)
-            return results, inds
+            return results, inds, topk_clses
         else:
             results = paddle.concat([clses, scores, bboxes], axis=1)
-            return results, paddle.shape(results)[0:1]
+            return results, paddle.shape(results)[0:1], topk_clses
 
 
 @register

ppdet/modeling/reid/fairmot_embedding_head.py

@@ -26,21 +26,27 @@ __all__ = ['FairMOTEmbeddingHead']
 
 @register
 class FairMOTEmbeddingHead(nn.Layer):
+    __shared__ = ['num_classes']
     """
     Args:
         in_channels (int): the channel number of input to FairMOTEmbeddingHead.
         ch_head (int): the channel of features before fed into embedding, 256 by default.
         ch_emb (int): the channel of the embedding feature, 128 by default.
-        num_identifiers (int): the number of identifiers, 14455 by default.
-
+        num_identities_dict (dict): the number of identities of each category,
+            support single class and multi-calss, {0: 14455} as default. 
     """
 
     def __init__(self,
                  in_channels,
                  ch_head=256,
                  ch_emb=128,
-                 num_identifiers=14455):
+                 num_classes=1,
+                 num_identities_dict={0: 14455}):
         super(FairMOTEmbeddingHead, self).__init__()
+        assert num_classes >= 1
+        self.num_classes = num_classes
+        self.ch_emb = ch_emb
+        self.num_identities_dict = num_identities_dict
         self.reid = nn.Sequential(
             ConvLayer(
                 in_channels, ch_head, kernel_size=3, padding=1, bias=True),
@@ -50,15 +56,27 @@ class FairMOTEmbeddingHead(nn.Layer):
         param_attr = paddle.ParamAttr(initializer=KaimingUniform())
         bound = 1 / math.sqrt(ch_emb)
         bias_attr = paddle.ParamAttr(initializer=Uniform(-bound, bound))
+        self.reid_loss = nn.CrossEntropyLoss(ignore_index=-1, reduction='sum')
+
+        if num_classes == 1:
+            nID = self.num_identities_dict[0] # single class
             self.classifier = nn.Linear(
                 ch_emb,
-            num_identifiers,
+                nID,
                 weight_attr=param_attr,
                 bias_attr=bias_attr)
-        self.reid_loss = nn.CrossEntropyLoss(ignore_index=-1, reduction='sum')
-        # When num_identifiers is 1, emb_scale is set as 1
+            # When num_identities(nID) is 1, emb_scale is set as 1
             self.emb_scale = math.sqrt(2) * math.log(
-            num_identifiers - 1) if num_identifiers > 1 else 1
+                nID - 1) if nID > 1 else 1
+        else:
+            self.classifiers = dict()
+            self.emb_scale_dict = dict()
+            for cls_id, nID in self.num_identities_dict.items():
+                self.classifiers[str(cls_id)] = nn.Linear(
+                    ch_emb, nID, weight_attr=param_attr, bias_attr=bias_attr)
+                # When num_identities(nID) is 1, emb_scale is set as 1
+                self.emb_scale_dict[str(cls_id)] = math.sqrt(2) * math.log(
+                    nID - 1) if nID > 1 else 1
 
     @classmethod
     def from_config(cls, cfg, input_shape):
@@ -66,14 +84,56 @@ class FairMOTEmbeddingHead(nn.Layer):
             input_shape = input_shape[0]
         return {'in_channels': input_shape.channels}
 
-    def forward(self, feat, inputs):
+    def process_by_class(self, det_outs, embedding, bbox_inds, topk_clses):
+        pred_dets, pred_embs = [], []
+        for cls_id in range(self.num_classes):
+            inds_masks = topk_clses == cls_id
+            inds_masks = paddle.cast(inds_masks, 'float32')
+
+            pos_num = inds_masks.sum().numpy()
+            if pos_num == 0:
+                continue
+
+            cls_inds_mask = inds_masks > 0
+
+            bbox_mask = paddle.nonzero(cls_inds_mask)
+            cls_det_outs = paddle.gather_nd(det_outs, bbox_mask)
+            pred_dets.append(cls_det_outs)
+
+            cls_inds = paddle.masked_select(bbox_inds, cls_inds_mask)
+            cls_inds = cls_inds.unsqueeze(-1)
+            cls_embedding = paddle.gather_nd(embedding, cls_inds)
+            pred_embs.append(cls_embedding)
+
+        return paddle.concat(pred_dets), paddle.concat(pred_embs)
+
+    def forward(self,
+                feat,
+                inputs,
+                det_outs=None,
+                bbox_inds=None,
+                topk_clses=None):
         reid_feat = self.reid(feat)
         if self.training:
+            if self.num_classes == 1:
                 loss = self.get_loss(reid_feat, inputs)
+            else:
+                loss = self.get_mc_loss(reid_feat, inputs)
             return loss
         else:
+            assert det_outs is not None and bbox_inds is not None
             reid_feat = F.normalize(reid_feat)
-            return reid_feat
+            embedding = paddle.transpose(reid_feat, [0, 2, 3, 1])
+            embedding = paddle.reshape(embedding, [-1, self.ch_emb])
+            # embedding shape: [bs * h * w, ch_emb]
+
+            if self.num_classes == 1:
+                pred_dets = det_outs
+                pred_embs = paddle.gather(embedding, bbox_inds)
+            else:
+                pred_dets, pred_embs = self.process_by_class(
+                    det_outs, embedding, bbox_inds, topk_clses)
+            return pred_dets, pred_embs
 
     def get_loss(self, feat, inputs):
         index = inputs['index']
@@ -113,3 +173,56 @@ class FairMOTEmbeddingHead(nn.Layer):
             loss = loss / count
 
         return loss
+
+    def get_mc_loss(self, feat, inputs):
+        # feat.shape = [bs, ch_emb, h, w]
+        assert 'cls_id_map' in inputs and 'cls_tr_ids' in inputs
+        index = inputs['index']
+        mask = inputs['index_mask']
+        cls_id_map = inputs['cls_id_map']  # [bs, h, w]
+        cls_tr_ids = inputs['cls_tr_ids']  # [bs, num_classes, h, w]
+
+        feat = paddle.transpose(feat, perm=[0, 2, 3, 1])
+        feat_n, feat_h, feat_w, feat_c = feat.shape
+        feat = paddle.reshape(feat, shape=[feat_n, -1, feat_c])
+
+        index = paddle.unsqueeze(index, 2)
+        batch_inds = list()
+        for i in range(feat_n):
+            batch_ind = paddle.full(
+                shape=[1, index.shape[1], 1], fill_value=i, dtype='int64')
+            batch_inds.append(batch_ind)
+        batch_inds = paddle.concat(batch_inds, axis=0)
+        index = paddle.concat(x=[batch_inds, index], axis=2)
+        feat = paddle.gather_nd(feat, index=index)
+
+        mask = paddle.unsqueeze(mask, axis=2)
+        mask = paddle.expand_as(mask, feat)
+        mask.stop_gradient = True
+        feat = paddle.masked_select(feat, mask > 0)
+        feat = paddle.reshape(feat, shape=[-1, feat_c])
+
+        reid_losses = 0
+        for cls_id, id_num in self.num_identities_dict.items():
+            # target
+            cur_cls_tr_ids = paddle.reshape(
+                cls_tr_ids[:, cls_id, :, :], shape=[feat_n, -1])  # [bs, h*w]
+            cls_id_target = paddle.gather_nd(cur_cls_tr_ids, index=index)
+            mask = inputs['index_mask']
+            cls_id_target = paddle.masked_select(cls_id_target, mask > 0)
+            cls_id_target.stop_gradient = True
+
+            # feat
+            cls_id_feat = self.emb_scale_dict[str(cls_id)] * F.normalize(feat)
+            cls_id_pred = self.classifiers[str(cls_id)](cls_id_feat)
+
+            loss = self.reid_loss(cls_id_pred, cls_id_target)
+            valid = (cls_id_target != self.reid_loss.ignore_index)
+            valid.stop_gradient = True
+            count = paddle.sum((paddle.cast(valid, dtype=np.int32)))
+            count.stop_gradient = True
+            if count > 0:
+                loss = loss / count
+            reid_losses += loss
+
+        return reid_losses

ppdet/modeling/reid/jde_embedding_head.py

@@ -49,7 +49,7 @@ class JDEEmbeddingHead(nn.Layer):
     JDEEmbeddingHead
     Args:
         num_classes(int): Number of classes. Only support one class tracking.
-        num_identifiers(int): Number of identifiers.
+        num_identities(int): Number of identities.
         anchor_levels(int): Number of anchor levels, same as FPN levels.
         anchor_scales(int): Number of anchor scales on each FPN level.
         embedding_dim(int): Embedding dimension. Default: 512.
@@ -60,7 +60,7 @@ class JDEEmbeddingHead(nn.Layer):
     def __init__(
             self,
             num_classes=1,
-            num_identifiers=14455,  # defined by dataset.total_identities when training
+            num_identities=14455,  # dataset.num_identities_dict[0]
             anchor_levels=3,
             anchor_scales=4,
             embedding_dim=512,
@@ -68,7 +68,7 @@ class JDEEmbeddingHead(nn.Layer):
             jde_loss='JDELoss'):
         super(JDEEmbeddingHead, self).__init__()
         self.num_classes = num_classes
-        self.num_identifiers = num_identifiers
+        self.num_identities = num_identities
         self.anchor_levels = anchor_levels
         self.anchor_scales = anchor_scales
         self.embedding_dim = embedding_dim
@@ -76,7 +76,7 @@ class JDEEmbeddingHead(nn.Layer):
         self.jde_loss = jde_loss
 
         self.emb_scale = math.sqrt(2) * math.log(
-            self.num_identifiers - 1) if self.num_identifiers > 1 else 1
+            self.num_identities - 1) if self.num_identities > 1 else 1
 
         self.identify_outputs = []
         self.loss_params_cls = []
@@ -106,7 +106,7 @@ class JDEEmbeddingHead(nn.Layer):
             'classifier',
             nn.Linear(
                 self.embedding_dim,
-                self.num_identifiers,
+                self.num_identities,
                 weight_attr=ParamAttr(
                     learning_rate=1., initializer=Normal(
                         mean=0.0, std=0.01)),