add multilabel feature

deploy/configs/inference_multilabel_cls.yaml

+Global:
+  infer_imgs: "./images/0517_2715693311.jpg"
+  inference_model_dir: "../inference/"
+  batch_size: 1
+  use_gpu: True
+  enable_mkldnn: False
+  cpu_num_threads: 10
+  enable_benchmark: True
+  use_fp16: False
+  ir_optim: True
+  use_tensorrt: False
+  gpu_mem: 8000
+  enable_profile: False
+PreProcess:
+  transform_ops:
+    - ResizeImage:
+        resize_short: 256
+    - CropImage:
+        size: 224
+    - NormalizeImage:
+        scale: 0.00392157
+        mean: [0.485, 0.456, 0.406]
+        std: [0.229, 0.224, 0.225]
+        order: ''
+        channel_num: 3
+    - ToCHWImage:
+PostProcess:
+  main_indicator: MultiLabelTopk
+  MultiLabelTopk:
+    topk: 5
+    class_id_map_file: None
+  SavePreLabel:
+    save_dir: ./pre_label/

deploy/python/postprocess.py

@@ -81,12 +81,14 @@ class Topk(object):
             class_id_map = None
         return class_id_map
 
-    def __call__(self, x, file_names=None):
+    def __call__(self, x, file_names=None, multilabel=False):
         if file_names is not None:
             assert x.shape[0] == len(file_names)
         y = []
         for idx, probs in enumerate(x):
-            index = probs.argsort(axis=0)[-self.topk:][::-1].astype("int32")
+            index = probs.argsort(axis=0)[-self.topk:][::-1].astype(
+                "int32") if not multilabel else np.where(
+                    probs >= 0.5)[0].astype("int32")
             clas_id_list = []
             score_list = []
             label_name_list = []
@@ -108,6 +110,14 @@ class Topk(object):
         return y
 
 
+class MultiLabelTopk(Topk):
+    def __init__(self, topk=1, class_id_map_file=None):
+        super().__init__()
+
+    def __call__(self, x, file_names=None):
+        return super().__call__(x, file_names, multilabel=True)
+
+
 class SavePreLabel(object):
     def __init__(self, save_dir):
         if save_dir is None:
@@ -128,23 +138,24 @@ class SavePreLabel(object):
         os.makedirs(output_dir, exist_ok=True)
         shutil.copy(image_file, output_dir)
 
+
 class Binarize(object):
-    def __init__(self, method = "round"):
+    def __init__(self, method="round"):
         self.method = method
         self.unit = np.array([[128, 64, 32, 16, 8, 4, 2, 1]]).T
 
     def __call__(self, x, file_names=None):
         if self.method == "round":
             x = np.round(x + 1).astype("uint8") - 1
-        
+
         if self.method == "sign":
             x = ((np.sign(x) + 1) / 2).astype("uint8")
 
         embedding_size = x.shape[1]
         assert embedding_size % 8 == 0, "The Binary index only support vectors with sizes multiple of 8"
-        
+
         byte = np.zeros([x.shape[0], embedding_size // 8], dtype=np.uint8)
         for i in range(embedding_size // 8):
-            byte[:, i:i+1] = np.dot(x[:, i * 8: (i + 1)* 8], self.unit)
+            byte[:, i:i + 1] = np.dot(x[:, i * 8:(i + 1) * 8], self.unit)
 
         return byte

deploy/python/predict_cls.py

@@ -71,7 +71,6 @@ class ClsPredictor(Predictor):
         output_names = self.paddle_predictor.get_output_names()
         output_tensor = self.paddle_predictor.get_output_handle(output_names[
             0])
-
         if self.benchmark:
             self.auto_logger.times.start()
         if not isinstance(images, (list, )):
@@ -119,7 +118,6 @@ def main(config):
                                                          ) == len(image_list):
             if len(batch_imgs) == 0:
                 continue
-
             batch_results = cls_predictor.predict(batch_imgs)
             for number, result_dict in enumerate(batch_results):
                 filename = batch_names[number]

deploy/shell/predict.sh

 # classification
 python3.7 python/predict_cls.py -c configs/inference_cls.yaml
 
+# multilabel_classification
+#python3.7 python/predict_cls.py -c configs/inference_multilabel_cls.yaml
+
 # feature extractor
 # python3.7 python/predict_rec.py -c configs/inference_rec.yaml
 

docs/zh_CN/advanced_tutorials/multilabel/multilabel.md

@@ -25,58 +25,66 @@ tar -xf NUS-SCENE-dataset.tar
 cd ../../
 ```
 
-## 二、环境准备
+## 二、模型训练
 
-### 2.1 下载预训练模型
+```shell
+export CUDA_VISIBLE_DEVICES=0,1,2,3
+python3 -m paddle.distributed.launch \
+    --gpus="0,1,2,3" \
+    tools/train.py \
+        -c ./ppcls/configs/quick_start/professional/MobileNetV1_multilabel.yaml
+```
+
+训练10epoch之后，验证集最好的正确率应该在0.95左右。
 
-本例展示基于ResNet50_vd模型的多标签分类流程，因此首先下载ResNet50_vd的预训练模型
+## 三、模型评估
 
 ```bash
-mkdir pretrained
-cd pretrained
-wget https://paddle-imagenet-models-name.bj.bcebos.com/dygraph/ResNet50_vd_pretrained.pdparams
-cd ../
+python3 tools/eval.py \
+    -c ./ppcls/configs/quick_start/professional/MobileNetV1_multilabel.yaml \
+    -o Arch.pretrained="./output/MobileNetV1/best_model"
 ```
 
-## 三、模型训练
+## 四、模型预测
 
-```shell
-export CUDA_VISIBLE_DEVICES=0
-python -m paddle.distributed.launch \
-    --gpus="0" \
-    tools/train.py \
-        -c ./configs/quick_start/ResNet50_vd_multilabel.yaml
+```bash
+python3 tools/infer.py \
+    -c ./ppcls/configs/quick_start/professional/MobileNetV1_multilabel.yaml \
+    -o Arch.pretrained="./output/MobileNetV1/best_model"
+```
+
+得到类似下面的输出：
+```  
+[{'class_ids': [6, 13, 17, 23, 26, 30], 'scores': [0.95683, 0.5567, 0.55211, 0.99088, 0.5943, 0.78767], 'file_name': './deploy/images/0517_2715693311.jpg', 'label_names': []}]
 ```
 
-训练10epoch之后，验证集最好的正确率应该在0.72左右。
+## 五、基于预测引擎预测
 
-## 四、模型评估
+### 5.1 导出inference model
 
 ```bash
-python tools/eval.py \
-    -c ./configs/quick_start/ResNet50_vd_multilabel.yaml \
-    -o pretrained_model="./output/ResNet50_vd/best_model/ppcls" \
-    -o load_static_weights=False
+python3 tools/export_model.py \
+    -c ./ppcls/configs/quick_start/professional/MobileNetV1_multilabel.yaml \
+    -o Arch.pretrained="./output/MobileNetV1/best_model"
 ```
+inference model的路径默认在当前路径下`./inference`
 
-评估指标采用mAP，验证集的mAP应该在0.57左右。
+### 5.2 基于预测引擎预测
 
-## 五、模型预测
+首先进入deploy目录下：
 
 ```bash
-python tools/infer/infer.py \
-    -i "./dataset/NUS-WIDE-SCENE/NUS-SCENE-dataset/images/0199_434752251.jpg" \
-    --model ResNet50_vd \
-    --pretrained_model "./output/ResNet50_vd/best_model/ppcls" \
-    --use_gpu True \
-    --load_static_weights False \
-    --multilabel True \
-    --class_num 33
+cd ./deploy
+```
+
+通过预测引擎推理预测：
+
+```
+python3 python/predict_cls.py \
+     -c configs/inference_multilabel_cls.yaml
 ```
 
 得到类似下面的输出：
-```    
-    class id: 3, probability: 0.6025
-    class id: 23, probability: 0.5491
-    class id: 32, probability: 0.7006
-```
\ No newline at end of file
+```
+0517_2715693311.jpg:    class id(s): [6, 13, 17, 23, 26, 30], score(s): [0.96, 0.56, 0.55, 0.99, 0.59, 0.79], label_name(s): []
+```

ppcls/configs/quick_start/MobileNetV1_multilabel.yaml

+# global configs
+Global:
+  checkpoints: null
+  pretrained_model: null
+  output_dir: ./output/
+  device: gpu
+  save_interval: 1
+  eval_during_train: True
+  eval_interval: 1
+  epochs: 10
+  print_batch_step: 10
+  use_visualdl: False
+  # used for static mode and model export
+  image_shape: [3, 224, 224]
+  save_inference_dir: ./inference
+  use_multilabel: True
+# model architecture
+Arch:
+  name: MobileNetV1
+  class_num: 33
+  pretrained: True
+
+# loss function config for traing/eval process
+Loss:
+  Train:
+    - MultiLabelLoss:
+        weight: 1.0
+  Eval:
+    - MultiLabelLoss:
+        weight: 1.0
+
+
+Optimizer:
+  name: Momentum
+  momentum: 0.9
+  lr:
+    name: Cosine
+    learning_rate: 0.1
+  regularizer:
+    name: 'L2'
+    coeff: 0.00004
+
+
+# data loader for train and eval
+DataLoader:
+  Train:
+    dataset:
+      name: MultiLabelDataset
+      image_root: ./dataset/NUS-SCENE-dataset/images/
+      cls_label_path: ./dataset/NUS-SCENE-dataset/multilabel_train_list.txt
+      transform_ops:
+        - DecodeImage:
+            to_rgb: True
+            channel_first: False
+        - RandCropImage:
+            size: 224
+        - RandFlipImage:
+            flip_code: 1
+        - NormalizeImage:
+            scale: 1.0/255.0
+            mean: [0.485, 0.456, 0.406]
+            std: [0.229, 0.224, 0.225]
+            order: ''
+
+    sampler:
+      name: DistributedBatchSampler
+      batch_size: 64
+      drop_last: False
+      shuffle: True
+    loader:
+      num_workers: 4
+      use_shared_memory: True
+
+  Eval:
+    dataset: 
+      name: MultiLabelDataset
+      image_root: ./dataset/NUS-SCENE-dataset/images/
+      cls_label_path: ./dataset/NUS-SCENE-dataset/multilabel_test_list.txt
+      transform_ops:
+        - DecodeImage:
+            to_rgb: True
+            channel_first: False
+        - ResizeImage:
+            resize_short: 256
+        - CropImage:
+            size: 224
+        - NormalizeImage:
+            scale: 1.0/255.0
+            mean: [0.485, 0.456, 0.406]
+            std: [0.229, 0.224, 0.225]
+            order: ''
+    sampler:
+      name: DistributedBatchSampler
+      batch_size: 256
+      drop_last: False
+      shuffle: False
+    loader:
+      num_workers: 4
+      use_shared_memory: True
+
+Infer:
+  infer_imgs: dataset/NUS-SCENE-dataset/images/0001_109549716.jpg
+  batch_size: 10
+  transforms:
+    - DecodeImage:
+        to_rgb: True
+        channel_first: False
+    - ResizeImage:
+        resize_short: 256
+    - CropImage:
+        size: 224
+    - NormalizeImage:
+        scale: 1.0/255.0
+        mean: [0.485, 0.456, 0.406]
+        std: [0.229, 0.224, 0.225]
+        order: ''
+    - ToCHWImage:
+  PostProcess:
+    name: MutiLabelTopk
+    topk: 5
+    class_id_map_file: None
+
+Metric:
+  Train:
+    - HammingDistance:
+    - AccuracyScore:
+  Eval:
+    - HammingDistance:
+    - AccuracyScore:

ppcls/configs/quick_start/professional/MobileNetV1_multilabel.yaml

+# global configs
+Global:
+  checkpoints: null
+  pretrained_model: null
+  output_dir: ./output/
+  device: gpu
+  save_interval: 1
+  eval_during_train: True
+  eval_interval: 1
+  epochs: 10
+  print_batch_step: 10
+  use_visualdl: False
+  # used for static mode and model export
+  image_shape: [3, 224, 224]
+  save_inference_dir: ./inference
+  use_multilabel: True
+# model architecture
+Arch:
+  name: MobileNetV1
+  class_num: 33
+  pretrained: True
+
+# loss function config for traing/eval process
+Loss:
+  Train:
+    - MultiLabelLoss:
+        weight: 1.0
+  Eval:
+    - MultiLabelLoss:
+        weight: 1.0
+
+
+Optimizer:
+  name: Momentum
+  momentum: 0.9
+  lr:
+    name: Cosine
+    learning_rate: 0.1
+  regularizer:
+    name: 'L2'
+    coeff: 0.00004
+
+
+# data loader for train and eval
+DataLoader:
+  Train:
+    dataset:
+      name: MultiLabelDataset
+      image_root: ./dataset/NUS-SCENE-dataset/images/
+      cls_label_path: ./dataset/NUS-SCENE-dataset/multilabel_train_list.txt
+      transform_ops:
+        - DecodeImage:
+            to_rgb: True
+            channel_first: False
+        - RandCropImage:
+            size: 224
+        - RandFlipImage:
+            flip_code: 1
+        - NormalizeImage:
+            scale: 1.0/255.0
+            mean: [0.485, 0.456, 0.406]
+            std: [0.229, 0.224, 0.225]
+            order: ''
+
+    sampler:
+      name: DistributedBatchSampler
+      batch_size: 64
+      drop_last: False
+      shuffle: True
+    loader:
+      num_workers: 4
+      use_shared_memory: True
+
+  Eval:
+    dataset: 
+      name: MultiLabelDataset
+      image_root: ./dataset/NUS-SCENE-dataset/images/
+      cls_label_path: ./dataset/NUS-SCENE-dataset/multilabel_test_list.txt
+      transform_ops:
+        - DecodeImage:
+            to_rgb: True
+            channel_first: False
+        - ResizeImage:
+            resize_short: 256
+        - CropImage:
+            size: 224
+        - NormalizeImage:
+            scale: 1.0/255.0
+            mean: [0.485, 0.456, 0.406]
+            std: [0.229, 0.224, 0.225]
+            order: ''
+    sampler:
+      name: DistributedBatchSampler
+      batch_size: 256
+      drop_last: False
+      shuffle: False
+    loader:
+      num_workers: 4
+      use_shared_memory: True
+
+Infer:
+  infer_imgs: ./deploy/images/0517_2715693311.jpg
+  batch_size: 10
+  transforms:
+    - DecodeImage:
+        to_rgb: True
+        channel_first: False
+    - ResizeImage:
+        resize_short: 256
+    - CropImage:
+        size: 224
+    - NormalizeImage:
+        scale: 1.0/255.0
+        mean: [0.485, 0.456, 0.406]
+        std: [0.229, 0.224, 0.225]
+        order: ''
+    - ToCHWImage:
+  PostProcess:
+    name: MultiLabelTopk
+    topk: 5
+    class_id_map_file: None
+
+Metric:
+  Train:
+    - HammingDistance:
+    - AccuracyScore:
+  Eval:
+    - HammingDistance:
+    - AccuracyScore:

ppcls/data/dataloader/multilabel_dataset.py

@@ -33,7 +33,7 @@ class MultiLabelDataset(CommonDataset):
         with open(self._cls_path) as fd:
             lines = fd.readlines()
             for l in lines:
-                l = l.strip().split(" ")
+                l = l.strip().split("\t")
                 self.images.append(os.path.join(self._img_root, l[0]))
 
                 labels = l[1].split(',')
@@ -44,13 +44,14 @@ class MultiLabelDataset(CommonDataset):
 
     def __getitem__(self, idx):
         try:
-            img = cv2.imread(self.images[idx])
-            img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
+            with open(self.images[idx], 'rb') as f:
+                img = f.read()
             if self._transform_ops:
                 img = transform(img, self._transform_ops)
             img = img.transpose((2, 0, 1))
             label = np.array(self.labels[idx]).astype("float32")
             return (img, label)
+
         except Exception as ex:
             logger.error("Exception occured when parse line: {} with msg: {}".
                          format(self.images[idx], ex))

ppcls/data/postprocess/__init__.py

@@ -16,7 +16,7 @@ import importlib
 
 from . import topk
 
-from .topk import Topk
+from .topk import Topk, MultiLabelTopk
 
 
 def build_postprocess(config):

ppcls/data/postprocess/topk.py

@@ -45,15 +45,17 @@ class Topk(object):
             class_id_map = None
         return class_id_map
 
-    def __call__(self, x, file_names=None):
+    def __call__(self, x, file_names=None, multilabel=False):
         assert isinstance(x, paddle.Tensor)
         if file_names is not None:
             assert x.shape[0] == len(file_names)
-        x = F.softmax(x, axis=-1)
+        x = F.softmax(x, axis=-1) if not multilabel else F.sigmoid(x)
         x = x.numpy()
         y = []
         for idx, probs in enumerate(x):
-            index = probs.argsort(axis=0)[-self.topk:][::-1].astype("int32")
+            index = probs.argsort(axis=0)[-self.topk:][::-1].astype(
+                "int32") if not multilabel else np.where(
+                    probs >= 0.5)[0].astype("int32")
             clas_id_list = []
             score_list = []
             label_name_list = []
@@ -73,3 +75,11 @@ class Topk(object):
                 result["label_names"] = label_name_list
             y.append(result)
         return y
+
+
+class MultiLabelTopk(Topk):
+    def __init__(self, topk=1, class_id_map_file=None):
+        super().__init__()
+
+    def __call__(self, x, file_names=None):
+        return super().__call__(x, file_names, multilabel=True)

ppcls/engine/engine.py

@@ -355,7 +355,8 @@ class Engine(object):
 
     def export(self):
         assert self.mode == "export"
-        model = ExportModel(self.config["Arch"], self.model)
+        use_multilabel = self.config["Global"].get("use_multilabel", False)
+        model = ExportModel(self.config["Arch"], self.model, use_multilabel)
         if self.config["Global"]["pretrained_model"] is not None:
             load_dygraph_pretrain(model.base_model,
                                   self.config["Global"]["pretrained_model"])
@@ -388,10 +389,9 @@ class ExportModel(nn.Layer):
     ExportModel: add softmax onto the model
     """
 
-    def __init__(self, config, model):
+    def __init__(self, config, model, use_multilabel):
         super().__init__()
         self.base_model = model
-
         # we should choose a final model to export
         if isinstance(self.base_model, DistillationModel):
             self.infer_model_name = config["infer_model_name"]
@@ -402,10 +402,13 @@ class ExportModel(nn.Layer):
         if self.infer_output_key == "features" and isinstance(self.base_model,
                                                               RecModel):
             self.base_model.head = IdentityHead()
-        if config.get("infer_add_softmax", True):
-            self.softmax = nn.Softmax(axis=-1)
+        if use_multilabel:
+            self.out_act = nn.Sigmoid()
         else:
-            self.softmax = None
+            if config.get("infer_add_softmax", True):
+                self.out_act = nn.Softmax(axis=-1)
+            else:
+                self.out_act = None
 
     def eval(self):
         self.training = False
@@ -421,6 +424,6 @@ class ExportModel(nn.Layer):
             x = x[self.infer_model_name]
         if self.infer_output_key is not None:
             x = x[self.infer_output_key]
-        if self.softmax is not None:
-            x = self.softmax(x)
+        if self.out_act is not None:
+            x = self.out_act(x)
         return x

ppcls/engine/evaluation/classification.py

@@ -52,7 +52,8 @@ def classification_eval(evaler, epoch_id=0):
         time_info["reader_cost"].update(time.time() - tic)
         batch_size = batch[0].shape[0]
         batch[0] = paddle.to_tensor(batch[0]).astype("float32")
-        batch[1] = batch[1].reshape([-1, 1]).astype("int64")
+        if not evaler.config["Global"].get("use_multilabel", False):
+            batch[1] = batch[1].reshape([-1, 1]).astype("int64")
         # image input
         out = evaler.model(batch[0])
         # calc loss

ppcls/engine/train/train.py

@@ -36,8 +36,8 @@ def train_epoch(trainer, epoch_id, print_batch_step):
                 paddle.to_tensor(batch[0]['label'])
             ]
         batch_size = batch[0].shape[0]
-        batch[1] = batch[1].reshape([-1, 1]).astype("int64")
-
+        if not trainer.config["Global"].get("use_multilabel", False):
+            batch[1] = batch[1].reshape([-1, 1]).astype("int64")
         trainer.global_step += 1
         # image input
         if trainer.amp:

ppcls/loss/__init__.py

@@ -20,6 +20,7 @@ from .distanceloss import DistanceLoss
 from .distillationloss import DistillationCELoss
 from .distillationloss import DistillationGTCELoss
 from .distillationloss import DistillationDMLLoss
+from .multilabelloss import MultiLabelLoss
 
 
 class CombinedLoss(nn.Layer):

ppcls/loss/multilabelloss.py

+import paddle
+import paddle.nn as nn
+import paddle.nn.functional as F
+
+
+class MultiLabelLoss(nn.Layer):
+    """
+    Multi-label loss
+    """
+
+    def __init__(self, epsilon=None):
+        super().__init__()
+        if epsilon is not None and (epsilon <= 0 or epsilon >= 1):
+            epsilon = None
+        self.epsilon = epsilon
+
+    def _labelsmoothing(self, target, class_num):
+        if target.ndim == 1 or target.shape[-1] != class_num:
+            one_hot_target = F.one_hot(target, class_num)
+        else:
+            one_hot_target = target
+        soft_target = F.label_smooth(one_hot_target, epsilon=self.epsilon)
+        soft_target = paddle.reshape(soft_target, shape=[-1, class_num])
+        return soft_target
+
+    def _binary_crossentropy(self, input, target, class_num):
+        if self.epsilon is not None:
+            target = self._labelsmoothing(target, class_num)
+            cost = F.binary_cross_entropy_with_logits(
+                logit=input, label=target)
+        else:
+            cost = F.binary_cross_entropy_with_logits(
+                logit=input, label=target)
+
+        return cost
+
+    def forward(self, x, target):
+        if isinstance(x, dict):
+            x = x["logits"]
+        class_num = x.shape[-1]
+        loss = self._binary_crossentropy(x, target, class_num)
+        loss = loss.mean()
+        return {"MultiLabelLoss": loss}

ppcls/metric/__init__.py

@@ -19,6 +19,8 @@ from collections import OrderedDict
 from .metrics import TopkAcc, mAP, mINP, Recallk, Precisionk
 from .metrics import DistillationTopkAcc
 from .metrics import GoogLeNetTopkAcc
+from .metrics import HammingDistance, AccuracyScore
+
 
 class CombinedMetrics(nn.Layer):
     def __init__(self, config_list):
@@ -32,7 +34,8 @@ class CombinedMetrics(nn.Layer):
             metric_name = list(config)[0]
             metric_params = config[metric_name]
             if metric_params is not None:
-                self.metric_func_list.append(eval(metric_name)(**metric_params))
+                self.metric_func_list.append(
+                    eval(metric_name)(**metric_params))
             else:
                 self.metric_func_list.append(eval(metric_name)())
 
@@ -42,6 +45,7 @@ class CombinedMetrics(nn.Layer):
             metric_dict.update(metric_func(*args, **kwargs))
         return metric_dict
 
+
 def build_metrics(config):
     metrics_list = CombinedMetrics(copy.deepcopy(config))
     return metrics_list

ppcls/metric/metrics.py

@@ -15,6 +15,12 @@
 import numpy as np
 import paddle
 import paddle.nn as nn
+import paddle.nn.functional as F
+
+from sklearn.metrics import hamming_loss
+from sklearn.metrics import accuracy_score as accuracy_metric
+from sklearn.metrics import multilabel_confusion_matrix
+from sklearn.preprocessing import binarize
 
 
 class TopkAcc(nn.Layer):
@@ -198,7 +204,7 @@ class Precisionk(nn.Layer):
             equal_flag = paddle.logical_and(equal_flag,
                                             keep_mask.astype('bool'))
         equal_flag = paddle.cast(equal_flag, 'float32')
-        
+
         Ns = paddle.arange(gallery_img_id.shape[0]) + 1
         equal_flag_cumsum = paddle.cumsum(equal_flag, axis=1)
         Precision_at_k = (paddle.mean(equal_flag_cumsum, axis=0) / Ns).numpy()
@@ -232,3 +238,71 @@ class GoogLeNetTopkAcc(TopkAcc):
 
     def forward(self, x, label):
         return super().forward(x[0], label)
+
+
+class MutiLabelMetric(object):
+    def __init__(self):
+        pass
+
+    def _multi_hot_encode(self, logits, threshold=0.5):
+        return binarize(logits, threshold=threshold)
+
+    def __call__(self, output):
+        output = F.sigmoid(output)
+        preds = self._multi_hot_encode(logits=output.numpy(), threshold=0.5)
+        return preds
+
+
+class HammingDistance(MutiLabelMetric):
+    """
+    Soft metric based label for multilabel classification
+    Returns:
+        The smaller the return value is, the better model is.
+    """
+
+    def __init__(self):
+        super().__init__()
+
+    def __call__(self, output, target):
+        preds = super().__call__(output)
+        metric_dict = dict()
+        metric_dict["HammingDistance"] = paddle.to_tensor(
+            hamming_loss(target, preds))
+        return metric_dict
+
+
+class AccuracyScore(MutiLabelMetric):
+    """
+    Hard metric for multilabel classification
+    Args:
+        base: ["sample", "label"], default="sample"
+            if "sample", return metric score based sample,
+            if "label", return metric score based label.
+    Returns:
+        accuracy:
+    """
+
+    def __init__(self, base="label"):
+        super().__init__()
+        assert base in ["sample", "label"
+                        ], 'must be one of ["sample", "label"]'
+        self.base = base
+
+    def __call__(self, output, target):
+        preds = super().__call__(output)
+        metric_dict = dict()
+        if self.base == "sample":
+            accuracy = accuracy_metric(target, preds)
+        elif self.base == "label":
+            mcm = multilabel_confusion_matrix(target, preds)
+            tns = mcm[:, 0, 0]
+            fns = mcm[:, 1, 0]
+            tps = mcm[:, 1, 1]
+            fps = mcm[:, 0, 1]
+            accuracy = (sum(tps) + sum(tns)) / (
+                sum(tps) + sum(tns) + sum(fns) + sum(fps))
+            precision = sum(tps) / (sum(tps) + sum(fps))
+            recall = sum(tps) / (sum(tps) + sum(fns))
+            F1 = 2 * (accuracy * recall) / (accuracy + recall)
+        metric_dict["AccuracyScore"] = paddle.to_tensor(accuracy)
+        return metric_dict

tools/train.sh

@@ -4,4 +4,4 @@
 # python3.7 tools/train.py -c ./ppcls/configs/ImageNet/ResNet/ResNet50.yaml
 
 # for multi-cards train
-python3.7 -m paddle.distributed.launch --gpus="0,1,2,3" tools/train.py -c ./ppcls/configs/ImageNet/ResNet/ResNet50.yaml
\ No newline at end of file
+python3.7 -m paddle.distributed.launch --gpus="0,1,2,3" tools/train.py -c ./ppcls/configs/ImageNet/ResNet/ResNet50.yaml

train.sh

+#!/usr/bin/env bash
+
+# for single card train
+# python3.7 tools/train.py -c ./ppcls/configs/ImageNet/ResNet/ResNet50.yaml
+
+# for multi-cards train
+python3.7 -m paddle.distributed.launch --gpus="0" tools/train.py -c ./MobileNetV2.yaml