[dev] add s2anet (#2432)

* Add S2ANet model for Oriented Object Detection.

configs/datasets/dota.yml

+metric: COCO
+num_classes: 15
+
+TrainDataset:
+  !COCODataSet
+    image_dir: trainval_split/images
+    anno_path: trainval_split/s2anet_trainval_paddle_coco.json
+    dataset_dir: /paddle/dataset/DOTA_1024_s2anet
+    data_fields: ['image', 'gt_bbox', 'gt_class', 'is_crowd', 'gt_rbox']
+
+EvalDataset:
+  !COCODataSet
+    image_dir: trainval_split/images
+    anno_path: trainval_split/s2anet_trainval_paddle_coco.json
+    dataset_dir: /paddle/dataset/DOTA_1024_s2anet/
+
+TestDataset:
+  !ImageFolder
+    anno_path: trainval_split/s2anet_trainval_paddle_coco.json
+    dataset_dir: /paddle/dataset/DOTA_1024_s2anet/

configs/dota/README.md

+# S2ANet模型
+
+## 内容
+- [简介](#简介)
+- [DOTA数据集](#DOTA数据集)
+- [模型库](#模型库)
+- [训练说明](#训练说明)
+
+## 简介
+
+[S2ANet](https://arxiv.org/pdf/2008.09397.pdf)是用于检测旋转框的模型，要求使用PaddlePaddle 2.0.1(可使用pip安装) 或适当的[develop版本](https://www.paddlepaddle.org.cn/documentation/docs/zh/develop/install/Tables.html#whl-release)。
+
+
+## DOTA数据集
+[DOTA Dataset]是航空影像中物体检测的数据集，包含2806张图像，每张图像4000*4000分辨率。
+
+|  数据版本  |  类别数  |   图像数   |  图像尺寸  |    实例数    |     标注方式     |
+|:--------:|:-------:|:---------:|:---------:| :---------:| :------------: |
+|   v1.0   |   15    |   2806    | 800~4000  |   118282    |   OBB + HBB     |
+|   v1.5   |   16    |   2806    | 800~4000  |   400000    |   OBB + HBB     |
+
+注：OBB标注方式是指标注任意四边形；顶点按顺时针顺序排列。HBB标注方式是指标注示例的外接矩形。
+
+DOTA数据集中总共有2806张图像，其中1411张图像作为训练集，458张图像作为评估集，剩余937张图像作为测试集。
+
+如果需要切割图像数据，请参考[DOTA_devkit](https://github.com/CAPTAIN-WHU/DOTA_devkit) 。
+
+设置`crop_size=1024, stride=824, gap=200`参数切割数据后，训练集15749张图像，评估集5297张图像，测试集10833张图像。
+
+## 模型库
+
+### S2ANet模型
+
+|     模型     | GPU个数  |  Conv类型  |   mAP    |   模型下载   |   配置文件   |
+|:-----------:|:-------:|:----------:|:--------:| :----------:| :---------: |
+|   S2ANet    |    8    |   Conv     |   71.42  |  [model](https://paddledet.bj.bcebos.com/models/s2anet_conv_1x_dota.pdparams) | [config](https://github.com/PaddlePaddle/PaddleDetection/tree/develop/configs/dota/s2anet_conv_1x_dota.yml)                   |
+
+**注意：**这里使用`multiclass_nms`，与原作者使用nms略有不同，精度相比原始论文中高0.15 (71.27-->71.42)。
+
+## 训练说明
+
+### 1. 旋转框IOU计算OP
+
+旋转框IOU计算OP[ext_op](../../ppdet/ext_op)是参考Paddle[自定义外部算子](https://www.paddlepaddle.org.cn/documentation/docs/zh/guides/07_new_op/new_custom_op.html) 的方式开发。
+
+若使用旋转框IOU计算OP，需要环境满足：
+- PaddlePaddle >= 2.0.1
+- GCC == 8.2
+
+推荐使用docker镜像[paddle:2.0.1-gpu-cuda10.1-cudnn7](registry.baidubce.com/paddlepaddle/paddle:2.0.1-gpu-cuda10.1-cudnn7)。
+
+执行如下命令下载镜像并启动容器：
+```
+sudo nvidia-docker run -it --name paddle_s2anet -v $PWD:/paddle --network=host registry.baidubce.com/paddlepaddle/paddle:2.0.1-gpu-cuda10.1-cudnn7 /bin/bash
+```
+
+进入容器后，安装必要的python包：
+```
+python3.7 -m pip install Cython wheel tqdm opencv-python==4.2.0.32 scipy  PyYAML shapely pycocotools
+```
+
+镜像中paddle2.0.1已安装好，进入python3.7，执行如下代码检查paddle安装是否正常：
+```
+import paddle
+print(paddle.__version__)
+paddle.utils.run_check()
+```
+
+进入到`ext_op`文件夹，安装：
+```
+python3.7 setup.py install
+```
+
+安装完成后，测试自定义op是否可以正常编译以及计算结果：
+```
+cd PaddleDetecetion/ppdet/ext_op
+python3.7 test.py
+```
+
+### 2. 数据格式
+DOTA 数据集中实例是按照任意四边形标注，在进行训练模型前，需要参考[DOTA2COCO](https://github.com/CAPTAIN-WHU/DOTA_devkit/blob/master/DOTA2COCO.py) 转换成`[xc, yc, bow_w, bow_h, angle]`格式，并以coco数据格式存储。
+
+## 评估
+
+执行如下命令，会在`output_dir`文件夹下将每个图像预测结果保存到同文件夹名的txt文本中。
+```
+python3.7 tools/infer.py -c configs/dota/s2anet_1x_dota.yml -o weights=./weights/s2anet_1x_dota.pdparams  --infer_dir=dota_test_images --draw_threshold=0.05 --save_txt=True --output_dir=output
+```
+
+
+请参考[DOTA_devkit](https://github.com/CAPTAIN-WHU/DOTA_devkit) 生成评估文件，评估文件格式请参考[DOTA Test](http://captain.whu.edu.cn/DOTAweb/tasks.html) ，生成zip文件，每个类一个txt文件，txt文件中每行格式为：`image_id score x1 y1 x2 y2 x3 y3 x4 y4`，提交服务器进行评估。
+
+## 预测部署
+
+Paddle中`multiclass_nms`算子的输入支持四边形输入，因此部署时可以不不需要依赖旋转框IOU计算算子。
+
+```bash
+# 预测
+CUDA_VISIBLE_DEVICES=0 python tools/infer.py -c configs/dota/s2anet_1x_dota.yml -o weights=model.pdparams --infer_img=demo/P0072__1.0__0___0.png --use_gpu=True
+```
+
+
+## Citations
+```
+@article{han2021align,  
+  author={J. {Han} and J. {Ding} and J. {Li} and G. -S. {Xia}},  
+  journal={IEEE Transactions on Geoscience and Remote Sensing},  
+  title={Align Deep Features for Oriented Object Detection},  
+  year={2021},
+  pages={1-11},  
+  doi={10.1109/TGRS.2021.3062048}}
+
+@inproceedings{xia2018dota,
+  title={DOTA: A large-scale dataset for object detection in aerial images},
+  author={Xia, Gui-Song and Bai, Xiang and Ding, Jian and Zhu, Zhen and Belongie, Serge and Luo, Jiebo and Datcu, Mihai and Pelillo, Marcello and Zhang, Liangpei},
+  booktitle={Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition},
+  pages={3974--3983},
+  year={2018}
+}
+```

configs/dota/_base_/s2anet.yml

+architecture: S2ANet
+pretrain_weights: https://paddledet.bj.bcebos.com/models/pretrained/ResNet50_cos_pretrained.pdparams
+weights: output/s2anet_r50_fpn_1x_dota/model_final.pdparams
+
+
+# Model Achitecture
+S2ANet:
+  backbone: ResNet
+  neck: FPN
+  s2anet_head: S2ANetHead
+  s2anet_bbox_post_process: S2ANetBBoxPostProcess
+
+ResNet:
+  depth: 50
+  norm_type: bn
+  return_idx: [1,2,3]
+  num_stages: 4
+
+FPN:
+  in_channels: [256, 512, 1024]
+  out_channel: 256
+  spatial_scales: [0.25, 0.125, 0.0625]
+  has_extra_convs: True
+  extra_stage: 2
+  relu_before_extra_convs: False
+
+S2ANetHead:
+  anchor_strides: [8, 16, 32, 64, 128]
+  anchor_scales: [4]
+  anchor_ratios: [1.0]
+  anchor_assign: RBoxAssigner
+  stacked_convs: 2
+  feat_in: 256
+  feat_out: 256
+  num_classes: 15
+  align_conv_type: 'AlignConv'  # AlignConv Conv
+  align_conv_size: 3
+  use_sigmoid_cls: True
+
+RBoxAssigner:
+  pos_iou_thr: 0.5
+  neg_iou_thr: 0.4
+  min_iou_thr: 0.0
+  ignore_iof_thr: -2
+
+S2ANetBBoxPostProcess:
+  nms_pre: 2000
+  min_bbox_size: 0.0
+  nms:
+    name: MultiClassNMS
+    keep_top_k: -1
+    score_threshold: 0.05
+    nms_threshold: 0.1

configs/dota/_base_/s2anet_optimizer_1x.yml

+epoch: 12
+
+LearningRate:
+  base_lr: 0.01
+  schedulers:
+  - !PiecewiseDecay
+    gamma: 0.1
+    milestones: [7, 10]
+  - !LinearWarmup
+    start_factor: 0.3333333333333333
+    steps: 500
+
+OptimizerBuilder:
+  optimizer:
+    momentum: 0.9
+    type: Momentum
+  regularizer:
+    factor: 0.0001
+    type: L2
+  clip_grad_by_norm: 35

configs/dota/_base_/s2anet_reader.yml

+worker_num: 0
+TrainReader:
+  sample_transforms:
+  - Decode: {}
+  - Rbox2Poly: {}
+  # Resize can process rbox
+  - Resize: {target_size: [1024, 1024], interp: 2, keep_ratio: False}
+  - RandomFlip: {prob: 0.5}
+  - NormalizeImage: {is_scale: true, mean: [0.485,0.456,0.406], std: [0.229, 0.224,0.225]}
+  - Permute: {}
+  batch_transforms:
+  - RboxPadBatch: {pad_to_stride: 32, pad_gt: true}
+  batch_size: 1
+  shuffle: true
+  drop_last: true
+
+
+EvalReader:
+  sample_transforms:
+  - Decode: {}
+  - Resize: {interp: 2, target_size: [1024, 1024], keep_ratio: True}
+  - NormalizeImage: {is_scale: true, mean: [0.485,0.456,0.406], std: [0.229, 0.224,0.225]}
+  - Permute: {}
+  batch_transforms:
+  - RboxPadBatch: {pad_to_stride: 32, pad_gt: false}
+  batch_size: 1
+  shuffle: false
+  drop_last: false
+  drop_empty: false
+
+
+TestReader:
+  sample_transforms:
+  - Decode: {}
+  - Resize: {interp: 2, target_size: [1024, 1024], keep_ratio: True}
+  - NormalizeImage: {is_scale: true, mean: [0.485,0.456,0.406], std: [0.229, 0.224,0.225]}
+  - Permute: {}
+  batch_transforms:
+  - RboxPadBatch: {pad_to_stride: 32, pad_gt: false}
+  batch_size: 1
+  shuffle: false
+  drop_last: false

configs/dota/s2anet_1x_dota.yml

+_BASE_: [
+  '../datasets/dota.yml',
+  '../runtime.yml',
+  '_base_/s2anet_optimizer_1x.yml',
+  '_base_/s2anet.yml',
+  '_base_/s2anet_reader.yml',
+]
+weights: output/s2anet_1x_dota/model_final

configs/dota/s2anet_conv_1x_dota.yml

+_BASE_: [
+  '../datasets/dota_debug.yml',
+  '../runtime.yml',
+  '_base_/s2anet_optimizer_1x.yml',
+  '_base_/s2anet.yml',
+  '_base_/s2anet_reader.yml',
+]
+weights: output/s2anet_1x_dota/model_final
+S2ANetHead:
+  anchor_strides: [ 8, 16, 32, 64, 128 ]
+  anchor_scales: [ 4 ]
+  anchor_ratios: [ 1.0 ]
+  anchor_assign: RBoxAssigner
+  stacked_convs: 2
+  feat_in: 256
+  feat_out: 256
+  num_classes: 15
+  align_conv_type: 'Conv'  # AlignConv Conv
+  align_conv_size: 3
+  use_sigmoid_cls: True

docs/tutorials/GETTING_STARTED_cn.md

@@ -52,6 +52,7 @@ python tools/infer.py -c configs/faster_rcnn/faster_rcnn_r50_fpn_1x_coco.yml --i
 |    --draw_threshold      |      infer     |  可视化时分数阈值  |  0.5  |  例如`--draw_threshold=0.7`  |
 |      --infer_dir         |       infer     |  用于预测的图片文件夹路径  |  None  |    `--infer_img`和`--infer_dir`必须至少设置一个 |
 |      --infer_img         |       infer     |  用于预测的图片路径  |  None  |  `--infer_img`和`--infer_dir`必须至少设置一个，`infer_img`具有更高优先级  |
+|      --save_txt          |       infer     |  是否在文件夹下将图片的预测结果保存到文本文件中        |  False  |  可选  |
 
 ## 使用示例
 

ppdet/data/source/coco.py

@@ -102,14 +102,26 @@ class COCODataSet(DetDataset):
                     else:
                         if not any(np.array(inst['bbox'])):
                             continue
-                    x1, y1, box_w, box_h = inst['bbox']
-                    x2 = x1 + box_w
-                    y2 = y1 + box_h
+
+                    # read rbox anno or not
+                    is_rbox_anno = True if len(inst['bbox']) == 5 else False
+                    if is_rbox_anno:
+                        xc, yc, box_w, box_h, angle = inst['bbox']
+                        x1 = xc - box_w / 2.0
+                        y1 = yc - box_h / 2.0
+                        x2 = x1 + box_w
+                        y2 = y1 + box_h
+                    else:
+                        x1, y1, box_w, box_h = inst['bbox']
+                        x2 = x1 + box_w
+                        y2 = y1 + box_h
                     eps = 1e-5
                     if inst['area'] > 0 and x2 - x1 > eps and y2 - y1 > eps:
                         inst['clean_bbox'] = [
                             round(float(x), 3) for x in [x1, y1, x2, y2]
                         ]
+                        if is_rbox_anno:
+                            inst['clean_rbox'] = [xc, yc, box_w, box_h, angle]
                         bboxes.append(inst)
                     else:
                         logger.warning(
@@ -122,6 +134,9 @@ class COCODataSet(DetDataset):
                     continue
 
                 gt_bbox = np.zeros((num_bbox, 4), dtype=np.float32)
+                if is_rbox_anno:
+                    gt_rbox = np.zeros((num_bbox, 5), dtype=np.float32)
+                gt_theta = np.zeros((num_bbox, 1), dtype=np.int32)
                 gt_class = np.zeros((num_bbox, 1), dtype=np.int32)
                 is_crowd = np.zeros((num_bbox, 1), dtype=np.int32)
                 difficult = np.zeros((num_bbox, 1), dtype=np.int32)
@@ -132,6 +147,9 @@ class COCODataSet(DetDataset):
                     catid = box['category_id']
                     gt_class[i][0] = self.catid2clsid[catid]
                     gt_bbox[i, :] = box['clean_bbox']
+                    # xc, yc, w, h, theta
+                    if is_rbox_anno:
+                        gt_rbox[i, :] = box['clean_rbox']
                     is_crowd[i][0] = box['iscrowd']
                     # check RLE format 
                     if 'segmentation' in box and box['iscrowd'] == 1:
@@ -150,12 +168,22 @@ class COCODataSet(DetDataset):
                     'w': im_w,
                 } if 'image' in self.data_fields else {}
 
-                gt_rec = {
-                    'is_crowd': is_crowd,
-                    'gt_class': gt_class,
-                    'gt_bbox': gt_bbox,
-                    'gt_poly': gt_poly,
-                }
+                if is_rbox_anno:
+                    gt_rec = {
+                        'is_crowd': is_crowd,
+                        'gt_class': gt_class,
+                        'gt_bbox': gt_bbox,
+                        'gt_rbox': gt_rbox,
+                        'gt_poly': gt_poly,
+                    }
+                else:
+                    gt_rec = {
+                        'is_crowd': is_crowd,
+                        'gt_class': gt_class,
+                        'gt_bbox': gt_bbox,
+                        'gt_poly': gt_poly,
+                    }
+
                 for k, v in gt_rec.items():
                     if k in self.data_fields:
                         coco_rec[k] = v

ppdet/data/transform/batch_operators.py

@@ -31,12 +31,8 @@ from ppdet.utils.logger import setup_logger
 logger = setup_logger(__name__)
 
 __all__ = [
-    'PadBatch',
-    'BatchRandomResize',
-    'Gt2YoloTarget',
-    'Gt2FCOSTarget',
-    'Gt2TTFTarget',
-    'Gt2Solov2Target',
+    'PadBatch', 'BatchRandomResize', 'Gt2YoloTarget', 'Gt2FCOSTarget',
+    'Gt2TTFTarget', 'Gt2Solov2Target', 'RboxPadBatch'
 ]
 
 
@@ -739,3 +735,155 @@ class Gt2Solov2Target(BaseOperator):
                 data['grid_order{}'.format(idx)] = gt_grid_order
 
         return samples
+
+
+@register_op
+class RboxPadBatch(BaseOperator):
+    """
+    Pad a batch of samples so they can be divisible by a stride.
+    The layout of each image should be 'CHW'. And convert poly to rbox.
+    Args:
+        pad_to_stride (int): If `pad_to_stride > 0`, pad zeros to ensure
+            height and width is divisible by `pad_to_stride`.
+    """
+
+    def __init__(self, pad_to_stride=0, pad_gt=False):
+        super(RboxPadBatch, self).__init__()
+        self.pad_to_stride = pad_to_stride
+        self.pad_gt = pad_gt
+
+    def poly_to_rbox(self, polys):
+        """
+        poly:[x0,y0,x1,y1,x2,y2,x3,y3]
+        to
+        rotated_boxes:[x_ctr,y_ctr,w,h,angle]
+        """
+        rotated_boxes = []
+        for poly in polys:
+            poly = np.array(poly[:8], dtype=np.float32)
+
+            pt1 = (poly[0], poly[1])
+            pt2 = (poly[2], poly[3])
+            pt3 = (poly[4], poly[5])
+            pt4 = (poly[6], poly[7])
+
+            edge1 = np.sqrt((pt1[0] - pt2[0]) * (pt1[0] - pt2[0]) + (pt1[
+                1] - pt2[1]) * (pt1[1] - pt2[1]))
+            edge2 = np.sqrt((pt2[0] - pt3[0]) * (pt2[0] - pt3[0]) + (pt2[
+                1] - pt3[1]) * (pt2[1] - pt3[1]))
+
+            width = max(edge1, edge2)
+            height = min(edge1, edge2)
+
+            angle = 0
+            if edge1 > edge2:
+                angle = np.arctan2(
+                    np.float(pt2[1] - pt1[1]), np.float(pt2[0] - pt1[0]))
+            elif edge2 >= edge1:
+                angle = np.arctan2(
+                    np.float(pt4[1] - pt1[1]), np.float(pt4[0] - pt1[0]))
+
+            def norm_angle(angle, range=[-np.pi / 4, np.pi]):
+                return (angle - range[0]) % range[1] + range[0]
+
+            angle = norm_angle(angle)
+
+            x_ctr = np.float(pt1[0] + pt3[0]) / 2.0
+            y_ctr = np.float(pt1[1] + pt3[1]) / 2.0
+            rotated_box = np.array([x_ctr, y_ctr, width, height, angle])
+            rotated_boxes.append(rotated_box)
+        ret_rotated_boxes = np.array(rotated_boxes)
+        assert ret_rotated_boxes.shape[1] == 5
+        return ret_rotated_boxes
+
+    def __call__(self, samples, context=None):
+        """
+        Args:
+            samples (list): a batch of sample, each is dict.
+        """
+        coarsest_stride = self.pad_to_stride
+
+        max_shape = np.array([data['image'].shape for data in samples]).max(
+            axis=0)
+        if coarsest_stride > 0:
+            max_shape[1] = int(
+                np.ceil(max_shape[1] / coarsest_stride) * coarsest_stride)
+            max_shape[2] = int(
+                np.ceil(max_shape[2] / coarsest_stride) * coarsest_stride)
+
+        for data in samples:
+            im = data['image']
+            im_c, im_h, im_w = im.shape[:]
+            padding_im = np.zeros(
+                (im_c, max_shape[1], max_shape[2]), dtype=np.float32)
+            padding_im[:, :im_h, :im_w] = im
+            data['image'] = padding_im
+            if 'semantic' in data and data['semantic'] is not None:
+                semantic = data['semantic']
+                padding_sem = np.zeros(
+                    (1, max_shape[1], max_shape[2]), dtype=np.float32)
+                padding_sem[:, :im_h, :im_w] = semantic
+                data['semantic'] = padding_sem
+            if 'gt_segm' in data and data['gt_segm'] is not None:
+                gt_segm = data['gt_segm']
+                padding_segm = np.zeros(
+                    (gt_segm.shape[0], max_shape[1], max_shape[2]),
+                    dtype=np.uint8)
+                padding_segm[:, :im_h, :im_w] = gt_segm
+                data['gt_segm'] = padding_segm
+        if self.pad_gt:
+            gt_num = []
+            if 'gt_poly' in data and data['gt_poly'] is not None and len(data[
+                    'gt_poly']) > 0:
+                pad_mask = True
+            else:
+                pad_mask = False
+
+            if pad_mask:
+                poly_num = []
+                poly_part_num = []
+                point_num = []
+            for data in samples:
+                gt_num.append(data['gt_bbox'].shape[0])
+                if pad_mask:
+                    poly_num.append(len(data['gt_poly']))
+                    for poly in data['gt_poly']:
+                        poly_part_num.append(int(len(poly)))
+                        for p_p in poly:
+                            point_num.append(int(len(p_p) / 2))
+            gt_num_max = max(gt_num)
+
+            for i, sample in enumerate(samples):
+                assert 'gt_rbox' in sample
+                assert 'gt_rbox2poly' in sample
+                gt_box_data = -np.ones([gt_num_max, 4], dtype=np.float32)
+                gt_class_data = -np.ones([gt_num_max], dtype=np.int32)
+                is_crowd_data = np.ones([gt_num_max], dtype=np.int32)
+
+                if pad_mask:
+                    poly_num_max = max(poly_num)
+                    poly_part_num_max = max(poly_part_num)
+                    point_num_max = max(point_num)
+                    gt_masks_data = -np.ones(
+                        [poly_num_max, poly_part_num_max, point_num_max, 2],
+                        dtype=np.float32)
+
+                gt_num = sample['gt_bbox'].shape[0]
+                gt_box_data[0:gt_num, :] = sample['gt_bbox']
+                gt_class_data[0:gt_num] = np.squeeze(sample['gt_class'])
+                is_crowd_data[0:gt_num] = np.squeeze(sample['is_crowd'])
+                if pad_mask:
+                    for j, poly in enumerate(sample['gt_poly']):
+                        for k, p_p in enumerate(poly):
+                            pp_np = np.array(p_p).reshape(-1, 2)
+                            gt_masks_data[j, k, :pp_np.shape[0], :] = pp_np
+                    sample['gt_poly'] = gt_masks_data
+                sample['gt_bbox'] = gt_box_data
+                sample['gt_class'] = gt_class_data
+                sample['is_crowd'] = is_crowd_data
+                # ploy to rbox
+                polys = sample['gt_rbox2poly']
+                rbox = self.poly_to_rbox(polys)
+                sample['gt_rbox'] = rbox
+
+        return samples

ppdet/data/transform/operators.py

@@ -536,6 +536,17 @@ class RandomFlip(BaseOperator):
         bbox[:, 2] = width - oldx1
         return bbox
 
+    def apply_rbox(self, bbox, width):
+        oldx1 = bbox[:, 0].copy()
+        oldx2 = bbox[:, 2].copy()
+        oldx3 = bbox[:, 4].copy()
+        oldx4 = bbox[:, 6].copy()
+        bbox[:, 0] = width - oldx2
+        bbox[:, 2] = width - oldx1
+        bbox[:, 4] = width - oldx3
+        bbox[:, 6] = width - oldx4
+        return bbox
+
     def apply(self, sample, context=None):
         """Filp the image and bounding box.
         Operators:
@@ -567,6 +578,10 @@ class RandomFlip(BaseOperator):
             if 'gt_segm' in sample and sample['gt_segm'].any():
                 sample['gt_segm'] = sample['gt_segm'][:, :, ::-1]
 
+            if 'gt_rbox2poly' in sample and sample['gt_rbox2poly'].any():
+                sample['gt_rbox2poly'] = self.apply_bbox(sample['gt_rbox2poly'],
+                                                         width)
+
             sample['flipped'] = True
             sample['image'] = im
         return sample
@@ -704,6 +719,16 @@ class Resize(BaseOperator):
                                                 [im_scale_x, im_scale_y],
                                                 [resize_w, resize_h])
 
+        # apply rbox
+        if 'gt_rbox2poly' in sample:
+            if np.array(sample['gt_rbox2poly']).shape[1] != 8:
+                logger.warn(
+                    "gt_rbox2poly's length shoule be 8, but actually is {}".
+                    format(len(sample['gt_rbox2poly'])))
+            sample['gt_rbox2poly'] = self.apply_bbox(sample['gt_rbox2poly'],
+                                                     [im_scale_x, im_scale_y],
+                                                     [resize_w, resize_h])
+
         # apply polygon
         if 'gt_poly' in sample and len(sample['gt_poly']) > 0:
             sample['gt_poly'] = self.apply_segm(sample['gt_poly'], im_shape[:2],
@@ -1933,3 +1958,113 @@ class Poly2Mask(BaseOperator):
         ]
         sample['gt_segm'] = np.asarray(masks).astype(np.uint8)
         return sample
+
+
+@register_op
+class Rbox2Poly(BaseOperator):
+    """
+    Convert rbbox format to poly format.
+    """
+
+    def __init__(self):
+        super(Rbox2Poly, self).__init__()
+
+    def apply(self, sample, context=None):
+        assert 'gt_rbox' in sample
+        assert sample['gt_rbox'].shape[1] == 5
+        rrect = sample['gt_rbox']
+        bbox_num = rrect.shape[0]
+        x_ctr = rrect[:, 0]
+        y_ctr = rrect[:, 1]
+        width = rrect[:, 2]
+        height = rrect[:, 3]
+        angle = rrect[:, 4]
+        tl_x, tl_y, br_x, br_y = -width / 2, -height / 2, width / 2, height / 2
+        # rect 2x4
+        rect = np.array([[tl_x, br_x, br_x, tl_x], [tl_y, tl_y, br_y, br_y]])
+        R = np.array([[np.cos(angle), -np.sin(angle)],
+                      [np.sin(angle), np.cos(angle)]])
+
+        poly = []
+        for i in range(R.shape[2]):
+            tmp_r = R[:, :, i].reshape(2, 2)
+            poly.append(tmp_r.dot(rect[:, :, i]))
+
+        # poly:[M, 2, 4]
+        poly = np.array(poly)
+        coor_x = poly[:, 0, :4] + x_ctr.reshape(bbox_num, 1)
+        coor_y = poly[:, 1, :4] + y_ctr.reshape(bbox_num, 1)
+        poly = np.stack(
+            [
+                coor_x[:, 0], coor_y[:, 0], coor_x[:, 1], coor_y[:, 1],
+                coor_x[:, 2], coor_y[:, 2], coor_x[:, 3], coor_y[:, 3]
+            ],
+            axis=1)
+        x1 = x_ctr - width / 2.0
+        y1 = y_ctr - height / 2.0
+        x2 = x_ctr + width / 2.0
+        y2 = y_ctr + height / 2.0
+        sample['gt_bbox'] = np.stack([x1, y1, x2, y2], axis=1)
+        sample['gt_rbox2poly'] = poly
+        return sample
+
+
+@register_op
+class Poly2Rbox(BaseOperator):
+    """
+    Convert poly format to rbbox format.
+    """
+
+    def __init__(self):
+        super(Poly2Rbox, self).__init__()
+
+    def poly_to_rbox(self, polys):
+        """
+        poly:[x0,y0,x1,y1,x2,y2,x3,y3]
+        to
+        rotated_boxes:[x_ctr,y_ctr,w,h,angle]
+        """
+        rotated_boxes = []
+        for poly in polys:
+            poly = np.array(poly[:8], dtype=np.float32)
+
+            pt1 = (poly[0], poly[1])
+            pt2 = (poly[2], poly[3])
+            pt3 = (poly[4], poly[5])
+            pt4 = (poly[6], poly[7])
+
+            edge1 = np.sqrt((pt1[0] - pt2[0]) * (pt1[0] - pt2[0]) + (pt1[
+                1] - pt2[1]) * (pt1[1] - pt2[1]))
+            edge2 = np.sqrt((pt2[0] - pt3[0]) * (pt2[0] - pt3[0]) + (pt2[
+                1] - pt3[1]) * (pt2[1] - pt3[1]))
+
+            width = max(edge1, edge2)
+            height = min(edge1, edge2)
+
+            angle = 0
+            if edge1 > edge2:
+                angle = np.arctan2(
+                    np.float(pt2[1] - pt1[1]), np.float(pt2[0] - pt1[0]))
+            elif edge2 >= edge1:
+                angle = np.arctan2(
+                    np.float(pt4[1] - pt1[1]), np.float(pt4[0] - pt1[0]))
+
+            def norm_angle(angle, range=[-np.pi / 4, np.pi]):
+                return (angle - range[0]) % range[1] + range[0]
+
+            angle = norm_angle(angle)
+
+            x_ctr = np.float(pt1[0] + pt3[0]) / 2
+            y_ctr = np.float(pt1[1] + pt3[1]) / 2
+            rotated_box = np.array([x_ctr, y_ctr, width, height, angle])
+            rotated_boxes.append(rotated_box)
+        ret_rotated_boxes = np.array(rotated_boxes)
+        assert ret_rotated_boxes.shape[1] == 5
+        return ret_rotated_boxes
+
+    def apply(self, sample, context=None):
+        assert 'gt_rbox2poly' in sample
+        poly = sample['gt_rbox2poly']
+        rbox = self.poly_to_rbox(poly)
+        sample['gt_rbox'] = rbox
+        return sample

ppdet/engine/export_utils.py

@@ -31,6 +31,7 @@ TRT_MIN_SUBGRAPH = {
     'SSD': 60,
     'RCNN': 40,
     'RetinaNet': 40,
+    'S2ANet': 40,
     'EfficientDet': 40,
     'Face': 3,
     'TTFNet': 3,

ppdet/engine/trainer.py

@@ -31,7 +31,7 @@ from paddle.static import InputSpec
 
 from ppdet.core.workspace import create
 from ppdet.utils.checkpoint import load_weight, load_pretrain_weight
-from ppdet.utils.visualizer import visualize_results
+from ppdet.utils.visualizer import visualize_results, save_result
 from ppdet.metrics import Metric, COCOMetric, VOCMetric, WiderFaceMetric, get_infer_results
 from ppdet.data.source.category import get_categories
 import ppdet.utils.stats as stats
@@ -333,7 +333,11 @@ class Trainer(object):
     def evaluate(self):
         self._eval_with_loader(self.loader)
 
-    def predict(self, images, draw_threshold=0.5, output_dir='output'):
+    def predict(self,
+                images,
+                draw_threshold=0.5,
+                output_dir='output',
+                save_txt=False):
         self.dataset.set_images(images)
         loader = create('TestReader')(self.dataset, 0)
 
@@ -369,6 +373,7 @@ class Trainer(object):
                         if 'mask' in batch_res else None
                 segm_res = batch_res['segm'][start:end] \
                         if 'segm' in batch_res else None
+
                 image = visualize_results(image, bbox_res, mask_res, segm_res,
                                           int(outs['im_id']), catid2name,
                                           draw_threshold)
@@ -380,6 +385,9 @@ class Trainer(object):
                 logger.info("Detection bbox results save in {}".format(
                     save_name))
                 image.save(save_name, quality=95)
+                if save_txt:
+                    save_path = os.path.splitext(save_name)[0] + '.txt'
+                    save_result(save_path, bbox_res, catid2name, draw_threshold)
                 start = end
 
     def _get_save_image_name(self, output_dir, image_path):

ppdet/ext_op/README.md

+# 自定义OP编译
+旋转框IOU计算OP是参考[自定义外部算子](https://www.paddlepaddle.org.cn/documentation/docs/zh/guides/07_new_op/new_custom_op.html) 。
+
+## 1. 环境依赖
+- Paddle >= 2.0.1
+- gcc 8.2
+
+## 2. 安装
+```
+python3.7 setup.py install
+```
+
+按照如下方式使用
+```
+# 引入自定义op
+from rbox_iou_ops import rbox_iou
+
+paddle.set_device('gpu:0')
+paddle.disable_static()
+
+rbox1 = np.random.rand(13000, 5)
+rbox2 = np.random.rand(7, 5)
+
+pd_rbox1 = paddle.to_tensor(rbox1)
+pd_rbox2 = paddle.to_tensor(rbox2)
+
+iou = rbox_iou(pd_rbox1, pd_rbox2)
+print('iou', iou)
+```
+
+## 3. 单元测试
+单元测试`test.py`文件中，通过对比python实现的结果和测试自定义op结果。
+
+由于python计算细节与cpp计算细节略有区别，误差区间设置为0.02。
+```
+python3.7 test.py
+```
+提示`rbox_iou OP compute right!`说明OP测试通过。

ppdet/ext_op/rbox_iou_op.cc

+/* 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. */
+
+#include "paddle/extension.h"
+
+#include <vector>
+
+std::vector<paddle::Tensor> RboxIouCPUForward(const paddle::Tensor& rbox1, const paddle::Tensor& rbox2);
+std::vector<paddle::Tensor> RboxIouCUDAForward(const paddle::Tensor& rbox1, const paddle::Tensor& rbox2);
+
+
+#define CHECK_INPUT_SAME(x1, x2) PD_CHECK(x1.place() == x2.place(), "input must be smae pacle.")
+std::vector<paddle::Tensor> RboxIouForward(const paddle::Tensor& rbox1, const paddle::Tensor& rbox2) {
+    CHECK_INPUT_SAME(rbox1, rbox2);
+    if (rbox1.place() == paddle::PlaceType::kCPU) {
+        return RboxIouCPUForward(rbox1, rbox2);
+    }
+    else if (rbox1.place() == paddle::PlaceType::kGPU) {
+        return RboxIouCUDAForward(rbox1, rbox2);
+    }
+}
+
+std::vector<std::vector<int64_t>> InferShape(std::vector<int64_t> rbox1_shape, std::vector<int64_t> rbox2_shape) {
+    return {{rbox1_shape[0], rbox2_shape[0]}};
+}
+
+std::vector<paddle::DataType> InferDtype(paddle::DataType t1, paddle::DataType t2) {
+    return {t1};
+}
+
+PD_BUILD_OP(rbox_iou)
+    .Inputs({"RBOX1", "RBOX2"})
+    .Outputs({"Output"})
+    .SetKernelFn(PD_KERNEL(RboxIouForward))
+    .SetInferShapeFn(PD_INFER_SHAPE(InferShape))
+    .SetInferDtypeFn(PD_INFER_DTYPE(InferDtype));

ppdet/ext_op/rbox_iou_op.cu

+/* 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. */
+
+
+#include <cassert>
+#include <cmath>
+
+#ifdef __CUDACC__
+// Designates functions callable from the host (CPU) and the device (GPU)
+#define HOST_DEVICE __host__ __device__
+#define HOST_DEVICE_INLINE HOST_DEVICE __forceinline__
+#else
+#include <algorithm>
+#define HOST_DEVICE
+#define HOST_DEVICE_INLINE HOST_DEVICE inline
+#endif
+
+#include "paddle/extension.h"
+
+#include <vector>
+
+namespace {
+
+template <typename T>
+struct RotatedBox {
+  T x_ctr, y_ctr, w, h, a;
+};
+
+template <typename T>
+struct Point {
+  T x, y;
+  HOST_DEVICE_INLINE Point(const T& px = 0, const T& py = 0) : x(px), y(py) {}
+  HOST_DEVICE_INLINE Point operator+(const Point& p) const {
+    return Point(x + p.x, y + p.y);
+  }
+  HOST_DEVICE_INLINE Point& operator+=(const Point& p) {
+    x += p.x;
+    y += p.y;
+    return *this;
+  }
+  HOST_DEVICE_INLINE Point operator-(const Point& p) const {
+    return Point(x - p.x, y - p.y);
+  }
+  HOST_DEVICE_INLINE Point operator*(const T coeff) const {
+    return Point(x * coeff, y * coeff);
+  }
+};
+
+template <typename T>
+HOST_DEVICE_INLINE T dot_2d(const Point<T>& A, const Point<T>& B) {
+  return A.x * B.x + A.y * B.y;
+}
+
+template <typename T>
+HOST_DEVICE_INLINE T cross_2d(const Point<T>& A, const Point<T>& B) {
+  return A.x * B.y - B.x * A.y;
+}
+
+template <typename T>
+HOST_DEVICE_INLINE void get_rotated_vertices(
+    const RotatedBox<T>& box,
+    Point<T> (&pts)[4]) {
+  // M_PI / 180. == 0.01745329251
+  //double theta = box.a * 0.01745329251;
+  //MODIFIED
+  double theta = box.a;
+  T cosTheta2 = (T)cos(theta) * 0.5f;
+  T sinTheta2 = (T)sin(theta) * 0.5f;
+
+  // y: top --> down; x: left --> right
+  pts[0].x = box.x_ctr - sinTheta2 * box.h - cosTheta2 * box.w;
+  pts[0].y = box.y_ctr + cosTheta2 * box.h - sinTheta2 * box.w;
+  pts[1].x = box.x_ctr + sinTheta2 * box.h - cosTheta2 * box.w;
+  pts[1].y = box.y_ctr - cosTheta2 * box.h - sinTheta2 * box.w;
+  pts[2].x = 2 * box.x_ctr - pts[0].x;
+  pts[2].y = 2 * box.y_ctr - pts[0].y;
+  pts[3].x = 2 * box.x_ctr - pts[1].x;
+  pts[3].y = 2 * box.y_ctr - pts[1].y;
+}
+
+template <typename T>
+HOST_DEVICE_INLINE int get_intersection_points(
+    const Point<T> (&pts1)[4],
+    const Point<T> (&pts2)[4],
+    Point<T> (&intersections)[24]) {
+  // Line vector
+  // A line from p1 to p2 is: p1 + (p2-p1)*t, t=[0,1]
+  Point<T> vec1[4], vec2[4];
+  for (int i = 0; i < 4; i++) {
+    vec1[i] = pts1[(i + 1) % 4] - pts1[i];
+    vec2[i] = pts2[(i + 1) % 4] - pts2[i];
+  }
+
+  // Line test - test all line combos for intersection
+  int num = 0; // number of intersections
+  for (int i = 0; i < 4; i++) {
+    for (int j = 0; j < 4; j++) {
+      // Solve for 2x2 Ax=b
+      T det = cross_2d<T>(vec2[j], vec1[i]);
+
+      // This takes care of parallel lines
+      if (fabs(det) <= 1e-14) {
+        continue;
+      }
+
+      auto vec12 = pts2[j] - pts1[i];
+
+      T t1 = cross_2d<T>(vec2[j], vec12) / det;
+      T t2 = cross_2d<T>(vec1[i], vec12) / det;
+
+      if (t1 >= 0.0f && t1 <= 1.0f && t2 >= 0.0f && t2 <= 1.0f) {
+        intersections[num++] = pts1[i] + vec1[i] * t1;
+      }
+    }
+  }
+
+  // Check for vertices of rect1 inside rect2
+  {
+    const auto& AB = vec2[0];
+    const auto& DA = vec2[3];
+    auto ABdotAB = dot_2d<T>(AB, AB);
+    auto ADdotAD = dot_2d<T>(DA, DA);
+    for (int i = 0; i < 4; i++) {
+      // assume ABCD is the rectangle, and P is the point to be judged
+      // P is inside ABCD iff. P's projection on AB lies within AB
+      // and P's projection on AD lies within AD
+
+      auto AP = pts1[i] - pts2[0];
+
+      auto APdotAB = dot_2d<T>(AP, AB);
+      auto APdotAD = -dot_2d<T>(AP, DA);
+
+      if ((APdotAB >= 0) && (APdotAD >= 0) && (APdotAB <= ABdotAB) &&
+          (APdotAD <= ADdotAD)) {
+        intersections[num++] = pts1[i];
+      }
+    }
+  }
+
+  // Reverse the check - check for vertices of rect2 inside rect1
+  {
+    const auto& AB = vec1[0];
+    const auto& DA = vec1[3];
+    auto ABdotAB = dot_2d<T>(AB, AB);
+    auto ADdotAD = dot_2d<T>(DA, DA);
+    for (int i = 0; i < 4; i++) {
+      auto AP = pts2[i] - pts1[0];
+
+      auto APdotAB = dot_2d<T>(AP, AB);
+      auto APdotAD = -dot_2d<T>(AP, DA);
+
+      if ((APdotAB >= 0) && (APdotAD >= 0) && (APdotAB <= ABdotAB) &&
+          (APdotAD <= ADdotAD)) {
+        intersections[num++] = pts2[i];
+      }
+    }
+  }
+
+  return num;
+}
+
+template <typename T>
+HOST_DEVICE_INLINE int convex_hull_graham(
+    const Point<T> (&p)[24],
+    const int& num_in,
+    Point<T> (&q)[24],
+    bool shift_to_zero = false) {
+  assert(num_in >= 2);
+
+  // Step 1:
+  // Find point with minimum y
+  // if more than 1 points have the same minimum y,
+  // pick the one with the minimum x.
+  int t = 0;
+  for (int i = 1; i < num_in; i++) {
+    if (p[i].y < p[t].y || (p[i].y == p[t].y && p[i].x < p[t].x)) {
+      t = i;
+    }
+  }
+  auto& start = p[t]; // starting point
+
+  // Step 2:
+  // Subtract starting point from every points (for sorting in the next step)
+  for (int i = 0; i < num_in; i++) {
+    q[i] = p[i] - start;
+  }
+
+  // Swap the starting point to position 0
+  auto tmp = q[0];
+  q[0] = q[t];
+  q[t] = tmp;
+
+  // Step 3:
+  // Sort point 1 ~ num_in according to their relative cross-product values
+  // (essentially sorting according to angles)
+  // If the angles are the same, sort according to their distance to origin
+  T dist[24];
+  for (int i = 0; i < num_in; i++) {
+    dist[i] = dot_2d<T>(q[i], q[i]);
+  }
+
+#ifdef __CUDACC__
+  // CUDA version
+  // In the future, we can potentially use thrust
+  // for sorting here to improve speed (though not guaranteed)
+  for (int i = 1; i < num_in - 1; i++) {
+    for (int j = i + 1; j < num_in; j++) {
+      T crossProduct = cross_2d<T>(q[i], q[j]);
+      if ((crossProduct < -1e-6) ||
+          (fabs(crossProduct) < 1e-6 && dist[i] > dist[j])) {
+        auto q_tmp = q[i];
+        q[i] = q[j];
+        q[j] = q_tmp;
+        auto dist_tmp = dist[i];
+        dist[i] = dist[j];
+        dist[j] = dist_tmp;
+      }
+    }
+  }
+#else
+  // CPU version
+  std::sort(
+      q + 1, q + num_in, [](const Point<T>& A, const Point<T>& B) -> bool {
+        T temp = cross_2d<T>(A, B);
+        if (fabs(temp) < 1e-6) {
+          return dot_2d<T>(A, A) < dot_2d<T>(B, B);
+        } else {
+          return temp > 0;
+        }
+      });
+#endif
+
+  // Step 4:
+  // Make sure there are at least 2 points (that don't overlap with each other)
+  // in the stack
+  int k; // index of the non-overlapped second point
+  for (k = 1; k < num_in; k++) {
+    if (dist[k] > 1e-8) {
+      break;
+    }
+  }
+  if (k == num_in) {
+    // We reach the end, which means the convex hull is just one point
+    q[0] = p[t];
+    return 1;
+  }
+  q[1] = q[k];
+  int m = 2; // 2 points in the stack
+  // Step 5:
+  // Finally we can start the scanning process.
+  // When a non-convex relationship between the 3 points is found
+  // (either concave shape or duplicated points),
+  // we pop the previous point from the stack
+  // until the 3-point relationship is convex again, or
+  // until the stack only contains two points
+  for (int i = k + 1; i < num_in; i++) {
+    while (m > 1 && cross_2d<T>(q[i] - q[m - 2], q[m - 1] - q[m - 2]) >= 0) {
+      m--;
+    }
+    q[m++] = q[i];
+  }
+
+  // Step 6 (Optional):
+  // In general sense we need the original coordinates, so we
+  // need to shift the points back (reverting Step 2)
+  // But if we're only interested in getting the area/perimeter of the shape
+  // We can simply return.
+  if (!shift_to_zero) {
+    for (int i = 0; i < m; i++) {
+      q[i] += start;
+    }
+  }
+
+  return m;
+}
+
+template <typename T>
+HOST_DEVICE_INLINE T polygon_area(const Point<T> (&q)[24], const int& m) {
+  if (m <= 2) {
+    return 0;
+  }
+
+  T area = 0;
+  for (int i = 1; i < m - 1; i++) {
+    area += fabs(cross_2d<T>(q[i] - q[0], q[i + 1] - q[0]));
+  }
+
+  return area / 2.0;
+}
+
+template <typename T>
+HOST_DEVICE_INLINE T rboxes_intersection(
+    const RotatedBox<T>& box1,
+    const RotatedBox<T>& box2) {
+  // There are up to 4 x 4 + 4 + 4 = 24 intersections (including dups) returned
+  // from rotated_rect_intersection_pts
+  Point<T> intersectPts[24], orderedPts[24];
+
+  Point<T> pts1[4];
+  Point<T> pts2[4];
+  get_rotated_vertices<T>(box1, pts1);
+  get_rotated_vertices<T>(box2, pts2);
+
+  int num = get_intersection_points<T>(pts1, pts2, intersectPts);
+
+  if (num <= 2) {
+    return 0.0;
+  }
+
+  // Convex Hull to order the intersection points in clockwise order and find
+  // the contour area.
+  int num_convex = convex_hull_graham<T>(intersectPts, num, orderedPts, true);
+  return polygon_area<T>(orderedPts, num_convex);
+}
+
+} // namespace
+
+template <typename T>
+HOST_DEVICE_INLINE T
+rbox_iou_single(T const* const box1_raw, T const* const box2_raw) {
+  // shift center to the middle point to achieve higher precision in result
+  RotatedBox<T> box1, box2;
+  auto center_shift_x = (box1_raw[0] + box2_raw[0]) / 2.0;
+  auto center_shift_y = (box1_raw[1] + box2_raw[1]) / 2.0;
+  box1.x_ctr = box1_raw[0] - center_shift_x;
+  box1.y_ctr = box1_raw[1] - center_shift_y;
+  box1.w = box1_raw[2];
+  box1.h = box1_raw[3];
+  box1.a = box1_raw[4];
+  box2.x_ctr = box2_raw[0] - center_shift_x;
+  box2.y_ctr = box2_raw[1] - center_shift_y;
+  box2.w = box2_raw[2];
+  box2.h = box2_raw[3];
+  box2.a = box2_raw[4];
+
+  const T area1 = box1.w * box1.h;
+  const T area2 = box2.w * box2.h;
+  if (area1 < 1e-14 || area2 < 1e-14) {
+    return 0.f;
+  }
+
+  const T intersection = rboxes_intersection<T>(box1, box2);
+  const T iou = intersection / (area1 + area2 - intersection);
+  return iou;
+}
+
+
+// 2D block with 32 * 16 = 512 threads per block
+const int BLOCK_DIM_X = 32;
+const int BLOCK_DIM_Y = 16;
+
+/**
+   Computes ceil(a / b)
+*/
+template <typename T>
+__host__ __device__ __forceinline__ T CeilDiv0(T a, T b) {
+  return (a + b - 1) / b;
+}
+
+static inline int CeilDiv(const int a, const int b) {
+  return (a + b -1)  / b;
+}
+
+template <typename T>
+__global__ void rbox_iou_cuda_kernel(
+    const int rbox1_num,
+    const int rbox2_num,
+    const T* rbox1_data_ptr,
+    const T* rbox2_data_ptr,
+    T* output_data_ptr) {
+
+  // get row_start and col_start
+  const int rbox1_block_idx = blockIdx.x * blockDim.x;
+  const int rbox2_block_idx = blockIdx.y * blockDim.y;
+
+  const int rbox1_thread_num = min(rbox1_num - rbox1_block_idx, blockDim.x);
+  const int rbox2_thread_num = min(rbox2_num - rbox2_block_idx, blockDim.y);
+
+  __shared__ T block_boxes1[BLOCK_DIM_X * 5];
+  __shared__ T block_boxes2[BLOCK_DIM_Y * 5];
+
+
+  // It's safe to copy using threadIdx.x since BLOCK_DIM_X >= BLOCK_DIM_Y
+  if (threadIdx.x < rbox1_thread_num && threadIdx.y == 0) {
+    block_boxes1[threadIdx.x * 5 + 0] =
+        rbox1_data_ptr[(rbox1_block_idx + threadIdx.x) * 5 + 0];
+    block_boxes1[threadIdx.x * 5 + 1] =
+        rbox1_data_ptr[(rbox1_block_idx + threadIdx.x) * 5 + 1];
+    block_boxes1[threadIdx.x * 5 + 2] =
+        rbox1_data_ptr[(rbox1_block_idx + threadIdx.x) * 5 + 2];
+    block_boxes1[threadIdx.x * 5 + 3] =
+        rbox1_data_ptr[(rbox1_block_idx + threadIdx.x) * 5 + 3];
+    block_boxes1[threadIdx.x * 5 + 4] =
+        rbox1_data_ptr[(rbox1_block_idx + threadIdx.x) * 5 + 4];
+  }
+
+  // threadIdx.x < BLOCK_DIM_Y=rbox2_thread_num, just use same condition as above: threadIdx.y == 0
+  if (threadIdx.x < rbox2_thread_num && threadIdx.y == 0) {
+    block_boxes2[threadIdx.x * 5 + 0] =
+        rbox2_data_ptr[(rbox2_block_idx + threadIdx.x) * 5 + 0];
+    block_boxes2[threadIdx.x * 5 + 1] =
+        rbox2_data_ptr[(rbox2_block_idx + threadIdx.x) * 5 + 1];
+    block_boxes2[threadIdx.x * 5 + 2] =
+        rbox2_data_ptr[(rbox2_block_idx + threadIdx.x) * 5 + 2];
+    block_boxes2[threadIdx.x * 5 + 3] =
+        rbox2_data_ptr[(rbox2_block_idx + threadIdx.x) * 5 + 3];
+    block_boxes2[threadIdx.x * 5 + 4] =
+        rbox2_data_ptr[(rbox2_block_idx + threadIdx.x) * 5 + 4];
+  }
+
+  // sync
+  __syncthreads();
+
+  if (threadIdx.x < rbox1_thread_num && threadIdx.y < rbox2_thread_num) {
+    int offset = (rbox1_block_idx + threadIdx.x) * rbox2_num + rbox2_block_idx + threadIdx.y;
+    output_data_ptr[offset] = rbox_iou_single<T>(block_boxes1 + threadIdx.x * 5, block_boxes2 + threadIdx.y * 5);
+  }
+}
+
+#define CHECK_INPUT_GPU(x) PD_CHECK(x.place() == paddle::PlaceType::kGPU, #x " must be a GPU Tensor.")
+
+std::vector<paddle::Tensor> RboxIouCUDAForward(const paddle::Tensor& rbox1, const paddle::Tensor& rbox2) {
+    CHECK_INPUT_GPU(rbox1);
+    CHECK_INPUT_GPU(rbox2);
+
+    auto rbox1_num = rbox1.shape()[0];
+    auto rbox2_num = rbox2.shape()[0];
+
+    auto output = paddle::Tensor(paddle::PlaceType::kGPU);
+    output.reshape({rbox1_num, rbox2_num});
+
+    const int blocks_x = CeilDiv(rbox1_num, BLOCK_DIM_X);
+    const int blocks_y = CeilDiv(rbox2_num, BLOCK_DIM_Y);
+
+    dim3 blocks(blocks_x, blocks_y);
+    dim3 threads(BLOCK_DIM_X, BLOCK_DIM_Y);
+
+    PD_DISPATCH_FLOATING_TYPES(
+        rbox1.type(),
+        "rbox_iou_cuda_kernel",
+        ([&] {
+            rbox_iou_cuda_kernel<data_t><<<blocks, threads, 0, rbox1.stream()>>>(
+                rbox1_num,
+                rbox2_num,
+                rbox1.data<data_t>(),
+                rbox2.data<data_t>(),
+                output.mutable_data<data_t>());
+        }));
+
+    return {output};
+}
+
+
+template <typename T>
+void rbox_iou_cpu_kernel(
+    const int rbox1_num,
+    const int rbox2_num,
+    const T* rbox1_data_ptr,
+    const T* rbox2_data_ptr,
+    T* output_data_ptr) {
+
+    int i, j;
+    for (i = 0; i < rbox1_num; i++) {
+        for (j = 0; j < rbox2_num; j++) {
+		int offset = i * rbox2_num + j;
+		output_data_ptr[offset] = rbox_iou_single<T>(rbox1_data_ptr + i * 5, rbox2_data_ptr + j * 5);
+        }
+    }
+}
+
+
+#define CHECK_INPUT_CPU(x) PD_CHECK(x.place() == paddle::PlaceType::kCPU, #x " must be a CPU Tensor.")
+
+std::vector<paddle::Tensor> RboxIouCPUForward(const paddle::Tensor& rbox1, const paddle::Tensor& rbox2) {
+    CHECK_INPUT_CPU(rbox1);
+    CHECK_INPUT_CPU(rbox2);
+
+    auto rbox1_num = rbox1.shape()[0];
+    auto rbox2_num = rbox2.shape()[0];
+
+    auto output = paddle::Tensor(paddle::PlaceType::kCPU);
+    output.reshape({rbox1_num, rbox2_num});
+
+    PD_DISPATCH_FLOATING_TYPES(
+        rbox1.type(),
+        "rbox_iou_cpu_kernel",
+        ([&] {
+            rbox_iou_cpu_kernel<data_t>(
+                rbox1_num,
+                rbox2_num,
+                rbox1.data<data_t>(),
+                rbox2.data<data_t>(),
+                output.mutable_data<data_t>());
+        }));
+    
+    return {output};
+}

ppdet/ext_op/setup.py

+from paddle.utils.cpp_extension import CppExtension, CUDAExtension, setup
+
+if __name__ == "__main__":
+    setup(
+        name='rbox_iou_ops',
+        ext_modules=CUDAExtension(sources=['rbox_iou_op.cc', 'rbox_iou_op.cu']))

ppdet/ext_op/test.py

+import numpy as np
+import os
+import sys
+import cv2
+import time
+import shapely
+from shapely.geometry import Polygon
+import paddle
+
+paddle.set_device('gpu:0')
+paddle.disable_static()
+
+try:
+    from rbox_iou_ops import rbox_iou
+except Exception as e:
+    print('import custom_ops error', e)
+    sys.exit(-1)
+
+# generate random data
+rbox1 = np.random.rand(13000, 5)
+rbox2 = np.random.rand(7, 5)
+
+# x1 y1 w h [0, 0.5]
+rbox1[:, 0:4] = rbox1[:, 0:4] * 0.45 + 0.001
+rbox2[:, 0:4] = rbox2[:, 0:4] * 0.45 + 0.001
+
+# generate rbox
+rbox1[:, 4] = rbox1[:, 4] - 0.5
+rbox2[:, 4] = rbox2[:, 4] - 0.5
+
+print('rbox1', rbox1.shape, 'rbox2', rbox2.shape)
+
+# to paddle tensor
+pd_rbox1 = paddle.to_tensor(rbox1)
+pd_rbox2 = paddle.to_tensor(rbox2)
+
+iou = rbox_iou(pd_rbox1, pd_rbox2)
+start_time = time.time()
+print('paddle time:', time.time() - start_time)
+print('iou is', iou.cpu().shape)
+
+
+# get gt
+def rbox2poly_single(rrect, get_best_begin_point=False):
+    """
+    rrect:[x_ctr,y_ctr,w,h,angle]
+    to
+    poly:[x0,y0,x1,y1,x2,y2,x3,y3]
+    """
+    x_ctr, y_ctr, width, height, angle = rrect[:5]
+    tl_x, tl_y, br_x, br_y = -width / 2, -height / 2, width / 2, height / 2
+    # rect 2x4
+    rect = np.array([[tl_x, br_x, br_x, tl_x], [tl_y, tl_y, br_y, br_y]])
+    R = np.array([[np.cos(angle), -np.sin(angle)],
+                  [np.sin(angle), np.cos(angle)]])
+    # poly
+    poly = R.dot(rect)
+    x0, x1, x2, x3 = poly[0, :4] + x_ctr
+    y0, y1, y2, y3 = poly[1, :4] + y_ctr
+    poly = np.array([x0, y0, x1, y1, x2, y2, x3, y3], dtype=np.float32)
+    return poly
+
+
+def intersection(g, p):
+    """
+    Intersection.
+    """
+
+    g = g[:8].reshape((4, 2))
+    p = p[:8].reshape((4, 2))
+
+    a = g
+    b = p
+
+    use_filter = True
+    if use_filter:
+        # step1:
+        inter_x1 = np.maximum(np.min(a[:, 0]), np.min(b[:, 0]))
+        inter_x2 = np.minimum(np.max(a[:, 0]), np.max(b[:, 0]))
+        inter_y1 = np.maximum(np.min(a[:, 1]), np.min(b[:, 1]))
+        inter_y2 = np.minimum(np.max(a[:, 1]), np.max(b[:, 1]))
+        if inter_x1 >= inter_x2 or inter_y1 >= inter_y2:
+            return 0.
+        x1 = np.minimum(np.min(a[:, 0]), np.min(b[:, 0]))
+        x2 = np.maximum(np.max(a[:, 0]), np.max(b[:, 0]))
+        y1 = np.minimum(np.min(a[:, 1]), np.min(b[:, 1]))
+        y2 = np.maximum(np.max(a[:, 1]), np.max(b[:, 1]))
+        if x1 >= x2 or y1 >= y2 or (x2 - x1) < 2 or (y2 - y1) < 2:
+            return 0.
+
+    g = Polygon(g)
+    p = Polygon(p)
+    #g = g.buffer(0)
+    #p = p.buffer(0)
+    if not g.is_valid or not p.is_valid:
+        return 0
+
+    inter = Polygon(g).intersection(Polygon(p)).area
+    union = g.area + p.area - inter
+    if union == 0:
+        return 0
+    else:
+        return inter / union
+
+
+# rbox_iou by python
+def rbox_overlaps(anchors, gt_bboxes, use_cv2=False):
+    """
+
+    Args:
+        anchors: [NA, 5]  x1,y1,x2,y2,angle
+        gt_bboxes: [M, 5]  x1,y1,x2,y2,angle
+
+    Returns:
+
+    """
+    assert anchors.shape[1] == 5
+    assert gt_bboxes.shape[1] == 5
+
+    gt_bboxes_ploy = [rbox2poly_single(e) for e in gt_bboxes]
+    anchors_ploy = [rbox2poly_single(e) for e in anchors]
+
+    num_gt, num_anchors = len(gt_bboxes_ploy), len(anchors_ploy)
+    iou = np.zeros((num_gt, num_anchors), dtype=np.float32)
+
+    start_time = time.time()
+    for i in range(num_gt):
+        for j in range(num_anchors):
+            try:
+                iou[i, j] = intersection(gt_bboxes_ploy[i], anchors_ploy[j])
+            except Exception as e:
+                print('cur gt_bboxes_ploy[i]', gt_bboxes_ploy[i],
+                      'anchors_ploy[j]', anchors_ploy[j], e)
+    iou = iou.T
+    print('intersection  all sp_time', time.time() - start_time)
+    return iou
+
+
+# make coor as int
+ploy_rbox1 = rbox1
+ploy_rbox2 = rbox2
+ploy_rbox1[:, 0:4] = rbox1[:, 0:4] * 1024
+ploy_rbox2[:, 0:4] = rbox2[:, 0:4] * 1024
+
+start_time = time.time()
+iou_py = rbox_overlaps(ploy_rbox1, ploy_rbox2, use_cv2=False)
+print('rbox time', time.time() - start_time)
+print(iou_py.shape)
+
+iou_pd = iou.cpu().numpy()
+sum_abs_diff = np.sum(np.abs(iou_pd - iou_py))
+print('sum of abs diff', sum_abs_diff)
+if sum_abs_diff < 0.02:
+    print("rbox_iou OP compute right!")

ppdet/metrics/coco_utils.py

@@ -21,7 +21,7 @@ import sys
 import numpy as np
 import itertools
 
-from ppdet.metrics.json_results import get_det_res, get_seg_res, get_solov2_segm_res
+from ppdet.metrics.json_results import get_det_res, get_det_poly_res, get_seg_res, get_solov2_segm_res
 from ppdet.metrics.map_utils import draw_pr_curve
 
 from ppdet.utils.logger import setup_logger
@@ -45,8 +45,12 @@ def get_infer_results(outs, catid, bias=0):
 
     infer_res = {}
     if 'bbox' in outs:
-        infer_res['bbox'] = get_det_res(
-            outs['bbox'], outs['bbox_num'], im_id, catid, bias=bias)
+        if len(outs['bbox']) > 0 and len(outs['bbox'][0]) > 6:
+            infer_res['bbox'] = get_det_poly_res(
+                outs['bbox'], outs['bbox_num'], im_id, catid, bias=bias)
+        else:
+            infer_res['bbox'] = get_det_res(
+                outs['bbox'], outs['bbox_num'], im_id, catid, bias=bias)
 
     if 'mask' in outs:
         # mask post process

ppdet/metrics/json_results.py

@@ -43,6 +43,54 @@ def get_det_res(bboxes, bbox_nums, image_id, label_to_cat_id_map, bias=0):
     return det_res
 
 
+def get_det_poly_res(bboxes, bbox_nums, image_id, label_to_cat_id_map, bias=0):
+    det_res = []
+    k = 0
+    for i in range(len(bbox_nums)):
+        cur_image_id = int(image_id[i][0])
+        det_nums = bbox_nums[i]
+        for j in range(det_nums):
+            dt = bboxes[k]
+            k = k + 1
+            num_id, score, x1, y1, x2, y2, x3, y3, x4, y4 = dt.tolist()
+            if int(num_id) < 0:
+                continue
+            category_id = int(num_id)
+            rbox = [x1, y1, x2, y2, x3, y3, x4, y4]
+            dt_res = {
+                'image_id': cur_image_id,
+                'category_id': category_id,
+                'bbox': rbox,
+                'score': score
+            }
+            det_res.append(dt_res)
+    return det_res
+
+
+def get_det_poly_res(bboxes, bbox_nums, image_id, label_to_cat_id_map, bias=0):
+    det_res = []
+    k = 0
+    for i in range(len(bbox_nums)):
+        cur_image_id = int(image_id[i][0])
+        det_nums = bbox_nums[i]
+        for j in range(det_nums):
+            dt = bboxes[k]
+            k = k + 1
+            num_id, score, x1, y1, x2, y2, x3, y3, x4, y4 = dt.tolist()
+            if int(num_id) < 0:
+                continue
+            category_id = int(num_id)
+            rbox = [x1, y1, x2, y2, x3, y3, x4, y4]
+            dt_res = {
+                'image_id': cur_image_id,
+                'category_id': category_id,
+                'bbox': rbox,
+                'score': score
+            }
+            det_res.append(dt_res)
+    return det_res
+
+
 def get_seg_res(masks, bboxes, mask_nums, image_id, label_to_cat_id_map):
     import pycocotools.mask as mask_util
     seg_res = []

ppdet/modeling/architectures/__init__.py

@@ -14,6 +14,7 @@ from . import ssd
 from . import fcos
 from . import solov2
 from . import ttfnet
+from . import s2anet
 
 from .meta_arch import *
 from .faster_rcnn import *
@@ -24,3 +25,4 @@ from .ssd import *
 from .fcos import *
 from .solov2 import *
 from .ttfnet import *
+from .s2anet import *

ppdet/modeling/architectures/s2anet.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 paddle
+from ppdet.core.workspace import register, create
+from .meta_arch import BaseArch
+import numpy as np
+
+__all__ = ['S2ANet']
+
+
+@register
+class S2ANet(BaseArch):
+    __category__ = 'architecture'
+    __inject__ = [
+        's2anet_head',
+        's2anet_bbox_post_process',
+    ]
+
+    def __init__(self, backbone, neck, s2anet_head, s2anet_bbox_post_process):
+        """
+        S2ANet, see https://arxiv.org/pdf/2008.09397.pdf
+
+        Args:
+            backbone (object): backbone instance
+            neck (object): `FPN` instance
+            s2anet_head (object): `S2ANetHead` instance
+            s2anet_bbox_post_process (object): `S2ANetBBoxPostProcess` instance
+        """
+        super(S2ANet, self).__init__()
+        self.backbone = backbone
+        self.neck = neck
+        self.s2anet_head = s2anet_head
+        self.s2anet_bbox_post_process = s2anet_bbox_post_process
+
+    @classmethod
+    def from_config(cls, cfg, *args, **kwargs):
+        backbone = create(cfg['backbone'])
+        kwargs = {'input_shape': backbone.out_shape}
+        neck = cfg['neck'] and create(cfg['neck'], **kwargs)
+
+        out_shape = neck and neck.out_shape or backbone.out_shape
+        kwargs = {'input_shape': out_shape}
+        s2anet_head = create(cfg['s2anet_head'], **kwargs)
+        s2anet_bbox_post_process = create(cfg['s2anet_bbox_post_process'],
+                                          **kwargs)
+
+        return {
+            'backbone': backbone,
+            'neck': neck,
+            "s2anet_head": s2anet_head,
+            "s2anet_bbox_post_process": s2anet_bbox_post_process,
+        }
+
+    def _forward(self):
+        body_feats = self.backbone(self.inputs)
+        if self.neck is not None:
+            body_feats = self.neck(body_feats)
+        self.s2anet_head(body_feats)
+        if self.training:
+            loss = self.s2anet_head.get_loss(self.inputs)
+            total_loss = paddle.add_n(list(loss.values()))
+            loss.update({'loss': total_loss})
+            return loss
+        else:
+            im_shape = self.inputs['im_shape']
+            scale_factor = self.inputs['scale_factor']
+            nms_pre = self.s2anet_bbox_post_process.nms_pre
+            pred_scores, pred_bboxes = self.s2anet_head.get_prediction(nms_pre)
+
+            # post_process
+            pred_cls_score_bbox, bbox_num, index = self.s2anet_bbox_post_process.get_prediction(
+                pred_scores, pred_bboxes, im_shape, scale_factor)
+
+            # output
+            output = {'bbox': pred_cls_score_bbox, 'bbox_num': bbox_num}
+            return output
+
+    def get_loss(self, ):
+        loss = self._forward()
+        return loss
+
+    def get_pred(self):
+        output = self._forward()
+        return output

ppdet/modeling/bbox_utils.py

@@ -16,6 +16,7 @@ import math
 import paddle
 import paddle.nn.functional as F
 import math
+import numpy as np
 
 
 def bbox2delta(src_boxes, tgt_boxes, weights):
@@ -260,3 +261,147 @@ def bbox_iou(box1, box2, giou=False, diou=False, ciou=False, eps=1e-9):
                 return iou - (rho2 / c2 + v * alpha)
     else:
         return iou
+
+
+def rect2rbox(bboxes):
+    """
+    :param bboxes: shape (n, 4) (xmin, ymin, xmax, ymax)
+    :return: dbboxes: shape (n, 5) (x_ctr, y_ctr, w, h, angle)
+    """
+    bboxes = bboxes.reshape(-1, 4)
+    num_boxes = bboxes.shape[0]
+
+    x_ctr = (bboxes[:, 2] + bboxes[:, 0]) / 2.0
+    y_ctr = (bboxes[:, 3] + bboxes[:, 1]) / 2.0
+    edges1 = np.abs(bboxes[:, 2] - bboxes[:, 0])
+    edges2 = np.abs(bboxes[:, 3] - bboxes[:, 1])
+    angles = np.zeros([num_boxes], dtype=bboxes.dtype)
+
+    inds = edges1 < edges2
+
+    rboxes = np.stack((x_ctr, y_ctr, edges1, edges2, angles), axis=1)
+    rboxes[inds, 2] = edges2[inds]
+    rboxes[inds, 3] = edges1[inds]
+    rboxes[inds, 4] = np.pi / 2.0
+    return rboxes
+
+
+def delta2rbox(Rrois,
+               deltas,
+               means=[0, 0, 0, 0, 0],
+               stds=[1, 1, 1, 1, 1],
+               wh_ratio_clip=1e-6):
+    """
+    :param Rrois: (cx, cy, w, h, theta)
+    :param deltas: (dx, dy, dw, dh, dtheta)
+    :param means:
+    :param stds:
+    :param wh_ratio_clip:
+    :return:
+    """
+    means = paddle.to_tensor(means)
+    stds = paddle.to_tensor(stds)
+    deltas = paddle.reshape(deltas, [-1, deltas.shape[-1]])
+    denorm_deltas = deltas * stds + means
+
+    dx = denorm_deltas[:, 0]
+    dy = denorm_deltas[:, 1]
+    dw = denorm_deltas[:, 2]
+    dh = denorm_deltas[:, 3]
+    dangle = denorm_deltas[:, 4]
+
+    max_ratio = np.abs(np.log(wh_ratio_clip))
+    dw = paddle.clip(dw, min=-max_ratio, max=max_ratio)
+    dh = paddle.clip(dh, min=-max_ratio, max=max_ratio)
+
+    Rroi_x = Rrois[:, 0]
+    Rroi_y = Rrois[:, 1]
+    Rroi_w = Rrois[:, 2]
+    Rroi_h = Rrois[:, 3]
+    Rroi_angle = Rrois[:, 4]
+
+    gx = dx * Rroi_w * paddle.cos(Rroi_angle) - dy * Rroi_h * paddle.sin(
+        Rroi_angle) + Rroi_x
+    gy = dx * Rroi_w * paddle.sin(Rroi_angle) + dy * Rroi_h * paddle.cos(
+        Rroi_angle) + Rroi_y
+    gw = Rroi_w * dw.exp()
+    gh = Rroi_h * dh.exp()
+    ga = np.pi * dangle + Rroi_angle
+    ga = (ga + np.pi / 4) % np.pi - np.pi / 4
+    ga = paddle.to_tensor(ga)
+
+    gw = paddle.to_tensor(gw, dtype='float32')
+    gh = paddle.to_tensor(gh, dtype='float32')
+    bboxes = paddle.stack([gx, gy, gw, gh, ga], axis=-1)
+    return bboxes
+
+
+def rbox2delta(proposals, gt, means=[0, 0, 0, 0, 0], stds=[1, 1, 1, 1, 1]):
+    """
+
+    Args:
+        proposals:
+        gt:
+        means: 1x5
+        stds: 1x5
+
+    Returns:
+
+    """
+    proposals = proposals.astype(np.float64)
+
+    PI = np.pi
+
+    gt_widths = gt[..., 2]
+    gt_heights = gt[..., 3]
+    gt_angle = gt[..., 4]
+
+    proposals_widths = proposals[..., 2]
+    proposals_heights = proposals[..., 3]
+    proposals_angle = proposals[..., 4]
+
+    coord = gt[..., 0:2] - proposals[..., 0:2]
+    dx = (np.cos(proposals[..., 4]) * coord[..., 0] + np.sin(proposals[..., 4])
+          * coord[..., 1]) / proposals_widths
+    dy = (-np.sin(proposals[..., 4]) * coord[..., 0] + np.cos(proposals[..., 4])
+          * coord[..., 1]) / proposals_heights
+    dw = np.log(gt_widths / proposals_widths)
+    dh = np.log(gt_heights / proposals_heights)
+    da = (gt_angle - proposals_angle)
+
+    da = (da + PI / 4) % PI - PI / 4
+    da /= PI
+
+    deltas = np.stack([dx, dy, dw, dh, da], axis=-1)
+    means = np.array(means, dtype=deltas.dtype)
+    stds = np.array(stds, dtype=deltas.dtype)
+    deltas = (deltas - means) / stds
+    deltas = deltas.astype(np.float32)
+    return deltas
+
+
+def bbox_decode(bbox_preds,
+                anchors,
+                means=[0, 0, 0, 0, 0],
+                stds=[1, 1, 1, 1, 1]):
+    """decode bbox from deltas
+    Args:
+        bbox_preds: [N,H,W,5]
+        anchors: [H*W,5]
+    return:
+        bboxes: [N,H,W,5]
+    """
+    means = paddle.to_tensor(means)
+    stds = paddle.to_tensor(stds)
+    num_imgs, H, W, _ = bbox_preds.shape
+    bboxes_list = []
+    for img_id in range(num_imgs):
+        bbox_pred = bbox_preds[img_id]
+        # bbox_pred.shape=[5,H,W]
+        bbox_delta = bbox_pred
+        anchors = paddle.to_tensor(anchors)
+        bboxes = delta2rbox(
+            anchors, bbox_delta, means, stds, wh_ratio_clip=1e-6)
+        bboxes = paddle.reshape(bboxes, [H, W, 5])
+        bboxes_list.append(bboxes)
+    return paddle.stack(bboxes_list, axis=0)
\ No newline at end of file

ppdet/modeling/heads/__init__.py

@@ -22,6 +22,7 @@ from . import solov2_head
 from . import ttf_head
 from . import cascade_head
 from . import face_head
+from . import s2anet_head
 
 from .bbox_head import *
 from .mask_head import *
@@ -33,3 +34,4 @@ from .solov2_head import *
 from .ttf_head import *
 from .cascade_head import *
 from .face_head import *
+from .s2anet_head import *

ppdet/modeling/post_process.py

@@ -218,3 +218,128 @@ class FCOSPostProcess(object):
                                     centerness, scale_factor)
         bbox_pred, bbox_num, _ = self.nms(bboxes, score)
         return bbox_pred, bbox_num
+
+
+@register
+class S2ANetBBoxPostProcess(object):
+    __inject__ = ['nms']
+
+    def __init__(self, nms_pre=2000, min_bbox_size=0, nms=None):
+        super(S2ANetBBoxPostProcess, self).__init__()
+        self.nms_pre = nms_pre
+        self.min_bbox_size = min_bbox_size
+        self.nms = nms
+        self.origin_shape_list = []
+
+    def rbox2poly(self, rrect, get_best_begin_point=True):
+        """
+        rrect: [N, 5] [x_ctr,y_ctr,w,h,angle]
+        to
+        poly:[x0,y0,x1,y1,x2,y2,x3,y3]
+        """
+        bbox_num = rrect.shape[0]
+        x_ctr = rrect[:, 0]
+        y_ctr = rrect[:, 1]
+        width = rrect[:, 2]
+        height = rrect[:, 3]
+        angle = rrect[:, 4]
+
+        tl_x, tl_y, br_x, br_y = -width / 2, -height / 2, width / 2, height / 2
+        # rect 2x4
+        rect = np.array([[tl_x, br_x, br_x, tl_x], [tl_y, tl_y, br_y, br_y]])
+        R = np.array([[np.cos(angle), -np.sin(angle)],
+                      [np.sin(angle), np.cos(angle)]])
+
+        # R:[2,2,M]  rect:[2,4,M]
+        #poly = R.dot(rect)
+        poly = []
+        for i in range(R.shape[2]):
+            poly.append(R[:, :, i].dot(rect[:, :, i]))
+        # poly:[M, 2, 4]
+        poly = np.array(poly)
+        coor_x = poly[:, 0, :4] + x_ctr.reshape(bbox_num, 1)
+        coor_y = poly[:, 1, :4] + y_ctr.reshape(bbox_num, 1)
+        poly = np.stack(
+            [
+                coor_x[:, 0], coor_y[:, 0], coor_x[:, 1], coor_y[:, 1],
+                coor_x[:, 2], coor_y[:, 2], coor_x[:, 3], coor_y[:, 3]
+            ],
+            axis=1)
+        if get_best_begin_point:
+            poly_lst = [get_best_begin_point_single(e) for e in poly]
+            poly = np.array(poly_lst)
+        return poly
+
+    def get_prediction(self, pred_scores, pred_bboxes, im_shape, scale_factor):
+        """
+        pred_scores : [N, M]  score
+        pred_bboxes : [N, 5]  xc, yc, w, h, a
+        im_shape : [N, 2]  im_shape
+        scale_factor : [N, 2]  scale_factor
+        """
+        # TODO: support bs>1
+        pred_ploys = self.rbox2poly(pred_bboxes.numpy(), False)
+        pred_ploys = paddle.to_tensor(pred_ploys)
+        pred_ploys = paddle.reshape(
+            pred_ploys, [1, pred_ploys.shape[0], pred_ploys.shape[1]])
+
+        pred_scores = paddle.to_tensor(pred_scores)
+        # pred_scores [NA, 16] --> [16, NA]
+        pred_scores = paddle.transpose(pred_scores, [1, 0])
+        pred_scores = paddle.reshape(
+            pred_scores, [1, pred_scores.shape[0], pred_scores.shape[1]])
+        pred_cls_score_bbox, bbox_num, index = self.nms(pred_ploys, pred_scores)
+
+        # post process scale
+        # result [n, 10]
+        if bbox_num > 0:
+            pred_bbox, bbox_num = self.post_process(pred_cls_score_bbox[:, 2:],
+                                                    bbox_num, im_shape[0],
+                                                    scale_factor[0])
+
+            pred_cls_score_bbox = paddle.concat(
+                [pred_cls_score_bbox[:, 0:2], pred_bbox], axis=1)
+        else:
+            pred_cls_score_bbox = paddle.to_tensor(
+                np.array(
+                    [[-1, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]],
+                    dtype='float32'))
+            bbox_num = paddle.to_tensor(np.array([1], dtype='int32'))
+        return pred_cls_score_bbox, bbox_num, index
+
+    def post_process(self, bboxes, bbox_num, im_shape, scale_factor):
+        """
+        Rescale, clip and filter the bbox from the output of NMS to
+        get final prediction.
+
+        Args:
+            bboxes(Tensor): bboxes [N, 8]
+            bbox_num(Tensor): bbox_num
+            im_shape(Tensor): [1 2]
+            scale_factor(Tensor): [1 2]
+        Returns:
+            bbox_pred(Tensor): The output is the prediction with shape [N, 8]
+                               including labels, scores and bboxes. The size of
+                               bboxes are corresponding to the original image.
+        """
+
+        origin_shape = paddle.floor(im_shape / scale_factor + 0.5)
+
+        origin_h = origin_shape[0]
+        origin_w = origin_shape[1]
+
+        bboxes[:, 0::2] = bboxes[:, 0::2] / scale_factor[0]
+        bboxes[:, 1::2] = bboxes[:, 1::2] / scale_factor[1]
+
+        zeros = paddle.zeros_like(origin_h)
+        x1 = paddle.maximum(paddle.minimum(bboxes[:, 0], origin_w), zeros)
+        y1 = paddle.maximum(paddle.minimum(bboxes[:, 1], origin_h), zeros)
+        x2 = paddle.maximum(paddle.minimum(bboxes[:, 2], origin_w), zeros)
+        y2 = paddle.maximum(paddle.minimum(bboxes[:, 3], origin_h), zeros)
+        x3 = paddle.maximum(paddle.minimum(bboxes[:, 4], origin_w), zeros)
+        y3 = paddle.maximum(paddle.minimum(bboxes[:, 5], origin_h), zeros)
+        x4 = paddle.maximum(paddle.minimum(bboxes[:, 6], origin_w), zeros)
+        y4 = paddle.maximum(paddle.minimum(bboxes[:, 7], origin_h), zeros)
+        bbox = paddle.stack([x1, y1, x2, y2, x3, y3, x4, y4], axis=-1)
+        bboxes = (bbox, bbox_num)
+        return bboxes

ppdet/modeling/proposal_generator/target_layer.py

-# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved. 
+# 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.  
@@ -11,12 +11,12 @@
 # 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.
-
+import sys
 import paddle
-
 from ppdet.core.workspace import register, serializable
-
 from .target import rpn_anchor_target, generate_proposal_target, generate_mask_target
+from ppdet.modeling import bbox_utils
+import numpy as np
 
 
 @register
@@ -176,3 +176,170 @@ class MaskAssigner(object):
 
         # mask_rois, mask_rois_num, tgt_classes, tgt_masks, mask_index, tgt_weights
         return outs
+
+
+@register
+class RBoxAssigner(object):
+    """
+    assigner of rbox
+    Args:
+        pos_iou_thr (float): threshold of pos samples
+        neg_iou_thr (float): threshold of neg samples
+        min_iou_thr (float): the min threshold of samples
+        ignore_iof_thr (int): the ignored threshold
+    """
+
+    def __init__(self,
+                 pos_iou_thr=0.5,
+                 neg_iou_thr=0.4,
+                 min_iou_thr=0.0,
+                 ignore_iof_thr=-2):
+        super(RBoxAssigner, self).__init__()
+
+        self.pos_iou_thr = pos_iou_thr
+        self.neg_iou_thr = neg_iou_thr
+        self.min_iou_thr = min_iou_thr
+        self.ignore_iof_thr = ignore_iof_thr
+
+    def anchor_valid(self, anchors):
+        """
+
+        Args:
+            anchor: M x 4
+
+        Returns:
+
+        """
+        if anchors.ndim == 3:
+            anchors = anchors.reshape(-1, anchor.shape[-1])
+        assert anchors.ndim == 2
+        anchor_num = anchors.shape[0]
+        anchor_valid = np.ones((anchor_num), np.uint8)
+        anchor_inds = np.arange(anchor_num)
+        return anchor_inds
+
+    def assign_anchor(self,
+                      anchors,
+                      gt_bboxes,
+                      gt_lables,
+                      pos_iou_thr,
+                      neg_iou_thr,
+                      min_iou_thr=0.0,
+                      ignore_iof_thr=-2):
+        """
+
+        Args:
+            anchors:
+            gt_bboxes:[M, 5] rc,yc,w,h,angle
+            gt_lables:
+
+        Returns:
+
+        """
+        assert anchors.shape[1] == 4 or anchors.shape[1] == 5
+        assert gt_bboxes.shape[1] == 4 or gt_bboxes.shape[1] == 5
+        anchors_xc_yc = anchors
+        gt_bboxes_xc_yc = gt_bboxes
+
+        # calc rbox iou
+        anchors_xc_yc = anchors_xc_yc.astype(np.float32)
+        gt_bboxes_xc_yc = gt_bboxes_xc_yc.astype(np.float32)
+        anchors_xc_yc = paddle.to_tensor(anchors_xc_yc, place=paddle.CPUPlace())
+        gt_bboxes_xc_yc = paddle.to_tensor(
+            gt_bboxes_xc_yc, place=paddle.CPUPlace())
+
+        try:
+            from rbox_iou_ops import rbox_iou
+        except Exception as e:
+            print('import custom_ops error', e)
+            sys.exit(-1)
+
+        iou = rbox_iou(gt_bboxes_xc_yc, anchors_xc_yc)
+        iou = iou.numpy()
+        iou = iou.T
+
+        # every gt's anchor's index
+        gt_bbox_anchor_inds = iou.argmax(axis=0)
+        gt_bbox_anchor_iou = iou[gt_bbox_anchor_inds, np.arange(iou.shape[1])]
+        gt_bbox_anchor_iou_inds = np.where(iou == gt_bbox_anchor_iou)[0]
+
+        # every anchor's gt bbox's index
+        anchor_gt_bbox_inds = iou.argmax(axis=1)
+        anchor_gt_bbox_iou = iou[np.arange(iou.shape[0]), anchor_gt_bbox_inds]
+
+        # (1) set labels=-2 as default
+        labels = np.ones((iou.shape[0], ), dtype=np.int32) * ignore_iof_thr
+
+        # (2) assign ignore
+        labels[anchor_gt_bbox_iou < min_iou_thr] = ignore_iof_thr
+
+        # (3) assign neg_ids -1
+        assign_neg_ids1 = anchor_gt_bbox_iou >= min_iou_thr
+        assign_neg_ids2 = anchor_gt_bbox_iou < neg_iou_thr
+        assign_neg_ids = np.logical_and(assign_neg_ids1, assign_neg_ids2)
+        labels[assign_neg_ids] = -1
+
+        # anchor_gt_bbox_iou_inds
+        # (4) assign max_iou as pos_ids >=0
+        anchor_gt_bbox_iou_inds = anchor_gt_bbox_inds[gt_bbox_anchor_iou_inds]
+        # gt_bbox_anchor_iou_inds = np.logical_and(gt_bbox_anchor_iou_inds, anchor_gt_bbox_iou >= min_iou_thr)
+        labels[gt_bbox_anchor_iou_inds] = gt_lables[anchor_gt_bbox_iou_inds]
+
+        # (5) assign >= pos_iou_thr as pos_ids
+        iou_pos_iou_thr_ids = anchor_gt_bbox_iou >= pos_iou_thr
+        iou_pos_iou_thr_ids_box_inds = anchor_gt_bbox_inds[iou_pos_iou_thr_ids]
+        labels[iou_pos_iou_thr_ids] = gt_lables[iou_pos_iou_thr_ids_box_inds]
+        return anchor_gt_bbox_inds, anchor_gt_bbox_iou, labels
+
+    def __call__(self, anchors, gt_bboxes, gt_labels, is_crowd):
+
+        assert anchors.ndim == 2
+        assert anchors.shape[1] == 5
+        assert gt_bboxes.ndim == 2
+        assert gt_bboxes.shape[1] == 5
+
+        pos_iou_thr = self.pos_iou_thr
+        neg_iou_thr = self.neg_iou_thr
+        min_iou_thr = self.min_iou_thr
+        ignore_iof_thr = self.ignore_iof_thr
+
+        anchor_num = anchors.shape[0]
+        anchors_inds = self.anchor_valid(anchors)
+        anchors = anchors[anchors_inds]
+        gt_bboxes = gt_bboxes
+        is_crowd_slice = is_crowd
+        not_crowd_inds = np.where(is_crowd_slice == 0)
+
+        # Step1: match anchor and gt_bbox
+        anchor_gt_bbox_inds, anchor_gt_bbox_iou, labels = self.assign_anchor(
+            anchors, gt_bboxes,
+            gt_labels.reshape(-1), pos_iou_thr, neg_iou_thr, min_iou_thr,
+            ignore_iof_thr)
+
+        # Step2: sample anchor
+        pos_inds = np.where(labels >= 0)[0]
+        neg_inds = np.where(labels == -1)[0]
+
+        # Step3: make output
+        anchors_num = anchors.shape[0]
+        bbox_targets = np.zeros_like(anchors)
+        bbox_weights = np.zeros_like(anchors)
+        pos_labels = np.ones(anchors_num, dtype=np.int32) * -1
+        pos_labels_weights = np.zeros(anchors_num, dtype=np.float32)
+
+        pos_sampled_anchors = anchors[pos_inds]
+        #print('ancho target pos_inds', pos_inds, len(pos_inds))
+        pos_sampled_gt_boxes = gt_bboxes[anchor_gt_bbox_inds[pos_inds]]
+        if len(pos_inds) > 0:
+            pos_bbox_targets = bbox_utils.rbox2delta(pos_sampled_anchors,
+                                                     pos_sampled_gt_boxes)
+            bbox_targets[pos_inds, :] = pos_bbox_targets
+            bbox_weights[pos_inds, :] = 1.0
+
+            pos_labels[pos_inds] = labels[pos_inds]
+            pos_labels_weights[pos_inds] = 1.0
+
+        if len(neg_inds) > 0:
+            pos_labels_weights[neg_inds] = 1.0
+        return (pos_labels, pos_labels_weights, bbox_targets, bbox_weights,
+                pos_inds, neg_inds)

ppdet/utils/visualizer.py

@@ -20,8 +20,9 @@ from __future__ import unicode_literals
 import numpy as np
 from PIL import Image, ImageDraw
 import cv2
-
 from .colormap import colormap
+from ppdet.utils.logger import setup_logger
+logger = setup_logger(__name__)
 
 __all__ = ['visualize_results']
 
@@ -86,21 +87,32 @@ def draw_bbox(image, im_id, catid2name, bboxes, threshold):
         if score < threshold:
             continue
 
-        xmin, ymin, w, h = bbox
-        xmax = xmin + w
-        ymax = ymin + h
-
         if catid not in catid2color:
             idx = np.random.randint(len(color_list))
             catid2color[catid] = color_list[idx]
         color = tuple(catid2color[catid])
 
         # draw bbox
-        draw.line(
-            [(xmin, ymin), (xmin, ymax), (xmax, ymax), (xmax, ymin),
-             (xmin, ymin)],
-            width=2,
-            fill=color)
+        if len(bbox) == 4:
+            # draw bbox
+            xmin, ymin, w, h = bbox
+            xmax = xmin + w
+            ymax = ymin + h
+            draw.line(
+                [(xmin, ymin), (xmin, ymax), (xmax, ymax), (xmax, ymin),
+                 (xmin, ymin)],
+                width=2,
+                fill=color)
+        elif len(bbox) == 8:
+            x1, y1, x2, y2, x3, y3, x4, y4 = bbox
+            draw.line(
+                [(x1, y1), (x2, y2), (x3, y3), (x4, y4), (x1, y1)],
+                width=2,
+                fill=color)
+            xmin = min(x1, x2, x3, x4)
+            ymin = min(y1, y2, y3, y4)
+        else:
+            logger.error('the shape of bbox must be [M, 4] or [M, 8]!')
 
         # draw label
         text = "{} {:.2f}".format(catid2name[catid], score)
@@ -112,6 +124,23 @@ def draw_bbox(image, im_id, catid2name, bboxes, threshold):
     return image
 
 
+def save_result(save_path, bbox_res, catid2name, threshold):
+    """
+    save result as txt
+    """
+    with open(save_path, 'w') as f:
+        for dt in bbox_res:
+            catid, bbox, score = dt['category_id'], dt['bbox'], dt['score']
+            if score < threshold:
+                continue
+            # each bbox result as a line
+            # for rbox: classname score x1 y1 x2 y2 x3 y3 x4 y4
+            # for bbox: classname score x1 y1 w h
+            bbox_pred = '{} {} '.format(catid2name[catid], score) + ' '.join(
+                [str(e) for e in bbox])
+            f.write(bbox_pred + '\n')
+
+
 def draw_segm(image,
               im_id,
               catid2name,

tools/infer.py

@@ -71,6 +71,11 @@ def parse_args():
         type=str,
         default="vdl_log_dir/image",
         help='VisualDL logging directory for image.')
+    parser.add_argument(
+        "--save_txt",
+        type=bool,
+        default=False,
+        help="whether to record the data to VisualDL.")
     args = parser.parse_args()
     return args
 
@@ -120,7 +125,8 @@ def run(FLAGS, cfg):
     trainer.predict(
         images,
         draw_threshold=FLAGS.draw_threshold,
-        output_dir=FLAGS.output_dir)
+        output_dir=FLAGS.output_dir,
+        save_txt=FLAGS.save_txt)
 
 
 def main():