Multi scale (#9837)

* update for multi scale

* update for multi scale

* update for multi scale

* rm notes

configs/rec/PP-OCRv4/ch_PP-OCRv4_rec.yml

@@ -73,7 +73,8 @@ Metric:
 
 Train:
   dataset:
-    name: SimpleDataSet
+    name: MultiScaleDataSet
+    ds_width: false
     data_dir: ./train_data/
     ext_op_transform_idx: 1
     label_file_list:
@@ -90,8 +91,6 @@ Train:
     - RecAug:
     - MultiLabelEncode:
         gtc_encode: NRTRLabelEncode
-    - RecResizeImg:
-        image_shape: [3, 48, 320]
     - KeepKeys:
         keep_keys:
         - image
@@ -99,11 +98,18 @@ Train:
         - label_gtc
         - length
         - valid_ratio
+  sampler:
+    name: MultiScaleSampler
+    scales: [[320, 32], [320, 48], [320, 64]]
+    first_bs: &bs 128
+    fix_bs: false
+    divided_factor: [8, 16] # w, h
+    is_training: True
   loader:
     shuffle: true
-    batch_size_per_card: 128
+    batch_size_per_card: *bs
     drop_last: true
-    num_workers: 4
+    num_workers: 8
 Eval:
   dataset:
     name: SimpleDataSet
@@ -115,9 +121,13 @@ Eval:
         img_mode: BGR
         channel_first: false
     - MultiLabelEncode:
+        max_text_length: 100
+        character_dict_path: ppocr/utils/ppocr_keys_v1.txt
+        use_space_char: True
         gtc_encode: NRTRLabelEncode
     - RecResizeImg:
         image_shape: [3, 48, 320]
+        eval_mode: True
     - KeepKeys:
         keep_keys:
         - image
@@ -128,5 +138,5 @@ Eval:
   loader:
     shuffle: false
     drop_last: false
-    batch_size_per_card: 128
+    batch_size_per_card: 1
     num_workers: 4

configs/rec/PP-OCRv4/ch_PP-OCRv4_rec_hgnet.yml

@@ -72,9 +72,9 @@ Metric:
 
 Train:
   dataset:
-    name: SimpleDataSet
+    name: MultiScaleDataSet
+    ds_width: false
     data_dir: ./train_data/
-    ext_op_transform_idx: 1
     label_file_list:
     - ./train_data/train_list.txt
     transforms:
@@ -89,8 +89,6 @@ Train:
     - RecAug:
     - MultiLabelEncode:
         gtc_encode: NRTRLabelEncode
-    - RecResizeImg:
-        image_shape: [3, 48, 320]
     - KeepKeys:
         keep_keys:
         - image
@@ -98,6 +96,14 @@ Train:
         - label_gtc
         - length
         - valid_ratio
+  sampler:
+    name: MultiScaleSampler
+    scales: [[320, 32], [320, 48], [320, 64]]
+    # divide_factor: to ensure the width and height dimensions can be devided by downsampling multiple
+    first_bs: &bs 128
+    fix_bs: false
+    divided_factor: [8, 16] # w, h
+    is_training: True
   loader:
     shuffle: true
     batch_size_per_card: 128
@@ -114,9 +120,13 @@ Eval:
         img_mode: BGR
         channel_first: false
     - MultiLabelEncode:
+        max_text_length: 100
+        character_dict_path: ppocr/utils/ppocr_keys_v1.txt
+        use_space_char: True
         gtc_encode: NRTRLabelEncode
     - RecResizeImg:
         image_shape: [3, 48, 320]
+        eval_mode: True
     - KeepKeys:
         keep_keys:
         - image

ppocr/data/__init__.py

@@ -33,10 +33,11 @@ from paddle.io import Dataset, DataLoader, BatchSampler, DistributedBatchSampler
 import paddle.distributed as dist
 
 from ppocr.data.imaug import transform, create_operators
-from ppocr.data.simple_dataset import SimpleDataSet
+from ppocr.data.simple_dataset import SimpleDataSet, MultiScaleDataSet
 from ppocr.data.lmdb_dataset import LMDBDataSet, LMDBDataSetSR, LMDBDataSetTableMaster
 from ppocr.data.pgnet_dataset import PGDataSet
 from ppocr.data.pubtab_dataset import PubTabDataSet
+from ppocr.data.multi_scale_sampler import MultiScaleSampler
 
 __all__ = ['build_dataloader', 'transform', 'create_operators']
 
@@ -55,7 +56,7 @@ def build_dataloader(config, mode, device, logger, seed=None):
 
     support_dict = [
         'SimpleDataSet', 'LMDBDataSet', 'PGDataSet', 'PubTabDataSet',
-        'LMDBDataSetSR', 'LMDBDataSetTableMaster'
+        'LMDBDataSetSR', 'LMDBDataSetTableMaster', 'MultiScaleDataSet'
     ]
     module_name = config[mode]['dataset']['name']
     assert module_name in support_dict, Exception(
@@ -76,6 +77,11 @@ def build_dataloader(config, mode, device, logger, seed=None):
 
     if mode == "Train":
         # Distribute data to multiple cards
+        if 'sampler' in config[mode]:
+            config_sampler = config[mode]['sampler']
+            sampler_name = config_sampler.pop("name")
+            batch_sampler = eval(sampler_name)(dataset, **config_sampler)
+        else:
             batch_sampler = DistributedBatchSampler(
                 dataset=dataset,
                 batch_size=batch_size,

ppocr/data/imaug/__init__.py

@@ -73,7 +73,7 @@ def create_operators(op_param_list, global_config=None):
                           dict) and len(operator) == 1, "yaml format error"
         op_name = list(operator)[0]
         param = {} if operator[op_name] is None else operator[op_name]
-        if global_config is not None:
+        if global_config is not None and "max_text_length" not in param:
             param.update(global_config)
         op = eval(op_name)(**param)
         ops.append(op)

ppocr/data/imaug/rec_img_aug.py

@@ -219,17 +219,20 @@ class RecResizeImg(object):
     def __init__(self,
                  image_shape,
                  infer_mode=False,
+                 eval_mode=False,
                  character_dict_path='./ppocr/utils/ppocr_keys_v1.txt',
                  padding=True,
                  **kwargs):
         self.image_shape = image_shape
         self.infer_mode = infer_mode
+        self.eval_mode = eval_mode
         self.character_dict_path = character_dict_path
         self.padding = padding
 
     def __call__(self, data):
         img = data['image']
-        if self.infer_mode and self.character_dict_path is not None:
+        if self.eval_mode or (self.infer_mode and
+                              self.character_dict_path is not None):
             norm_img, valid_ratio = resize_norm_img_chinese(img,
                                                             self.image_shape)
         else:

ppocr/data/multi_scale_sampler.py

+from paddle.io import Sampler
+import paddle.distributed as dist
+
+import numpy as np
+import random
+import math
+
+
+class MultiScaleSampler(Sampler):
+    def __init__(self,
+                 data_source,
+                 scales,
+                 first_bs=128,
+                 fix_bs=True,
+                 divided_factor=[8, 16],
+                 is_training=True,
+                 ratio_wh=0.8,
+                 max_w=480.,
+                 seed=None):
+        """
+            multi scale samper
+            Args:
+                data_source(dataset)
+                scales(list): several scales for image resolution
+                first_bs(int): batch size for the first scale in scales
+                divided_factor(list[w, h]): ImageNet models down-sample images by a factor, ensure that width and height dimensions are multiples are multiple of devided_factor.
+                is_training(boolean): mode 
+        """
+        # min. and max. spatial dimensions
+        self.data_source = data_source
+        self.data_idx_order_list = np.array(data_source.data_idx_order_list)
+        self.ds_width = data_source.ds_width
+        self.seed = data_source.seed
+        if self.ds_width:
+            self.wh_ratio = data_source.wh_ratio
+            self.wh_ratio_sort = data_source.wh_ratio_sort
+        self.n_data_samples = len(self.data_source)
+        self.ratio_wh = ratio_wh
+        self.max_w = max_w
+
+        if isinstance(scales[0], list):
+            width_dims = [i[0] for i in scales]
+            height_dims = [i[1] for i in scales]
+        elif isinstance(scales[0], int):
+            width_dims = scales
+            height_dims = scales
+        base_im_w = width_dims[0]
+        base_im_h = height_dims[0]
+        base_batch_size = first_bs
+
+        # Get the GPU and node related information
+        num_replicas = dist.get_world_size()
+        rank = dist.get_rank()
+        # adjust the total samples to avoid batch dropping
+        num_samples_per_replica = int(
+            math.ceil(self.n_data_samples * 1.0 / num_replicas))
+
+        img_indices = [idx for idx in range(self.n_data_samples)]
+
+        self.shuffle = False
+        if is_training:
+            # compute the spatial dimensions and corresponding batch size
+            # ImageNet models down-sample images by a factor of 32.
+            # Ensure that width and height dimensions are multiples are multiple of 32.
+            width_dims = [
+                int((w // divided_factor[0]) * divided_factor[0])
+                for w in width_dims
+            ]
+            height_dims = [
+                int((h // divided_factor[1]) * divided_factor[1])
+                for h in height_dims
+            ]
+
+            img_batch_pairs = list()
+            base_elements = base_im_w * base_im_h * base_batch_size
+            for (h, w) in zip(height_dims, width_dims):
+                if fix_bs:
+                    batch_size = base_batch_size
+                else:
+                    batch_size = int(max(1, (base_elements / (h * w))))
+                img_batch_pairs.append((w, h, batch_size))
+            self.img_batch_pairs = img_batch_pairs
+            self.shuffle = True
+        else:
+            self.img_batch_pairs = [(base_im_w, base_im_h, base_batch_size)]
+
+        self.img_indices = img_indices
+        self.n_samples_per_replica = num_samples_per_replica
+        self.epoch = 0
+        self.rank = rank
+        self.num_replicas = num_replicas
+
+        self.batch_list = []
+        self.current = 0
+        indices_rank_i = self.img_indices[self.rank:len(self.img_indices):
+                                          self.num_replicas]
+        while self.current < self.n_samples_per_replica:
+            curr_w, curr_h, curr_bsz = random.choice(self.img_batch_pairs)
+
+            end_index = min(self.current + curr_bsz, self.n_samples_per_replica)
+
+            batch_ids = indices_rank_i[self.current:end_index]
+            n_batch_samples = len(batch_ids)
+            if n_batch_samples != curr_bsz:
+                batch_ids += indices_rank_i[:(curr_bsz - n_batch_samples)]
+            self.current += curr_bsz
+
+            if len(batch_ids) > 0:
+                batch = [curr_w, curr_h, len(batch_ids)]
+                self.batch_list.append(batch)
+        self.length = len(self.batch_list)
+        self.batchs_in_one_epoch = self.iter()
+        self.batchs_in_one_epoch_id = [
+            i for i in range(len(self.batchs_in_one_epoch))
+        ]
+
+    def __iter__(self):
+        if self.seed is None:
+            random.seed(self.epoch)
+            self.epoch += 1
+        else:
+            random.seed(self.seed)
+        random.shuffle(self.batchs_in_one_epoch_id)
+        for batch_tuple_id in self.batchs_in_one_epoch_id:
+            yield self.batchs_in_one_epoch[batch_tuple_id]
+
+    def iter(self):
+        if self.shuffle:
+            if self.seed is not None:
+                random.seed(self.seed)
+            else:
+                random.seed(self.epoch)
+            if not self.ds_width:
+                random.shuffle(self.img_indices)
+            random.shuffle(self.img_batch_pairs)
+            indices_rank_i = self.img_indices[self.rank:len(self.img_indices):
+                                              self.num_replicas]
+        else:
+            indices_rank_i = self.img_indices[self.rank:len(self.img_indices):
+                                              self.num_replicas]
+
+        start_index = 0
+        batchs_in_one_epoch = []
+        for batch_tuple in self.batch_list:
+            curr_w, curr_h, curr_bsz = batch_tuple
+            end_index = min(start_index + curr_bsz, self.n_samples_per_replica)
+            batch_ids = indices_rank_i[start_index:end_index]
+            n_batch_samples = len(batch_ids)
+            if n_batch_samples != curr_bsz:
+                batch_ids += indices_rank_i[:(curr_bsz - n_batch_samples)]
+            start_index += curr_bsz
+
+            if len(batch_ids) > 0:
+                if self.ds_width:
+                    wh_ratio_current = self.wh_ratio[self.wh_ratio_sort[
+                        batch_ids]]
+                    ratio_current = wh_ratio_current.mean()
+                    ratio_current = ratio_current if ratio_current * curr_h < self.max_w else self.max_w / curr_h
+                else:
+                    ratio_current = None
+                batch = [(curr_w, curr_h, b_id, ratio_current)
+                         for b_id in batch_ids]
+                # yield batch
+                batchs_in_one_epoch.append(batch)
+        return batchs_in_one_epoch
+
+    def set_epoch(self, epoch: int):
+        self.epoch = epoch
+
+    def __len__(self):
+        return self.length

ppocr/data/simple_dataset.py

@@ -12,6 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import numpy as np
+import cv2
+import math
 import os
 import json
 import random
@@ -163,3 +165,96 @@ class SimpleDataSet(Dataset):
 
     def __len__(self):
         return len(self.data_idx_order_list)
+
+
+class MultiScaleDataSet(SimpleDataSet):
+    def __init__(self, config, mode, logger, seed=None):
+        super(MultiScaleDataSet, self).__init__(config, mode, logger, seed)
+        self.ds_width = config[mode]['dataset'].get('ds_width', False)
+        if self.ds_width:
+            self.wh_aware()
+
+    def wh_aware(self):
+        data_line_new = []
+        wh_ratio = []
+        for lins in self.data_lines:
+            data_line_new.append(lins)
+            lins = lins.decode('utf-8')
+            name, label, w, h = lins.strip("\n").split(self.delimiter)
+            wh_ratio.append(float(w) / float(h))
+
+        self.data_lines = data_line_new
+        self.wh_ratio = np.array(wh_ratio)
+        self.wh_ratio_sort = np.argsort(self.wh_ratio)
+        self.data_idx_order_list = list(range(len(self.data_lines)))
+
+    def resize_norm_img(self, data, imgW, imgH, padding=True):
+        img = data['image']
+        h = img.shape[0]
+        w = img.shape[1]
+        if not padding:
+            resized_image = cv2.resize(
+                img, (imgW, imgH), interpolation=cv2.INTER_LINEAR)
+            resized_w = imgW
+        else:
+            ratio = w / float(h)
+            if math.ceil(imgH * ratio) > imgW:
+                resized_w = imgW
+            else:
+                resized_w = int(math.ceil(imgH * ratio))
+            resized_image = cv2.resize(img, (resized_w, imgH))
+        resized_image = resized_image.astype('float32')
+
+        resized_image = resized_image.transpose((2, 0, 1)) / 255
+        resized_image -= 0.5
+        resized_image /= 0.5
+        padding_im = np.zeros((3, imgH, imgW), dtype=np.float32)
+        padding_im[:, :, :resized_w] = resized_image
+        valid_ratio = min(1.0, float(resized_w / imgW))
+        data['image'] = padding_im
+        data['valid_ratio'] = valid_ratio
+        return data
+
+    def __getitem__(self, properties):
+        # properites is a tuple, contains (width, height, index)
+        img_height = properties[1]
+        idx = properties[2]
+        if self.ds_width and properties[3] is not None:
+            wh_ratio = properties[3]
+            img_width = img_height * (1 if int(round(wh_ratio)) == 0 else
+                                      int(round(wh_ratio)))
+            file_idx = self.wh_ratio_sort[idx]
+        else:
+            file_idx = self.data_idx_order_list[idx]
+            img_width = properties[0]
+            wh_ratio = None
+
+        data_line = self.data_lines[file_idx]
+        try:
+            data_line = data_line.decode('utf-8')
+            substr = data_line.strip("\n").split(self.delimiter)
+            file_name = substr[0]
+            file_name = self._try_parse_filename_list(file_name)
+            label = substr[1]
+            img_path = os.path.join(self.data_dir, file_name)
+            data = {'img_path': img_path, 'label': label}
+            if not os.path.exists(img_path):
+                raise Exception("{} does not exist!".format(img_path))
+            with open(data['img_path'], 'rb') as f:
+                img = f.read()
+                data['image'] = img
+            data['ext_data'] = self.get_ext_data()
+            outs = transform(data, self.ops[:-1])
+            if outs is not None:
+                outs = self.resize_norm_img(outs, img_width, img_height)
+                outs = transform(outs, self.ops[-1:])
+        except:
+            self.logger.error(
+                "When parsing line {}, error happened with msg: {}".format(
+                    data_line, traceback.format_exc()))
+            outs = None
+        if outs is None:
+            # during evaluation, we should fix the idx to get same results for many times of evaluation.
+            rnd_idx = (idx + 1) % self.__len__()
+            return self.__getitem__([img_width, img_height, rnd_idx, wh_ratio])
+        return outs