add sast code

configs/det/det_r50_vd_sast_icdar15.yml

+Global:
+  algorithm: SAST
+  use_gpu: true
+  epoch_num: 2000
+  log_smooth_window: 20
+  print_batch_step: 2
+  save_model_dir: ./output/det_sast/
+  save_epoch_step: 20
+  eval_batch_step: 5000
+  train_batch_size_per_card: 8
+  test_batch_size_per_card: 8
+  image_shape: [3, 512, 512]
+  reader_yml: ./configs/det/det_sast_icdar15_reader.yml
+  pretrain_weights: ./pretrain_models/ResNet50_vd_ssld_pretrained/
+  save_res_path: ./output/det_sast/predicts_sast.txt
+  checkpoints: 
+  save_inference_dir:
+
+Architecture:
+  function: ppocr.modeling.architectures.det_model,DetModel
+
+Backbone:
+  function: ppocr.modeling.backbones.det_resnet_vd_sast,ResNet
+  layers: 50
+
+Head:
+  function: ppocr.modeling.heads.det_sast_head,SASTHead
+  model_name: large
+  only_fpn_up: False
+#   with_cab: False
+  with_cab: True
+
+Loss:
+  function: ppocr.modeling.losses.det_sast_loss,SASTLoss
+
+Optimizer:
+  function: ppocr.optimizer,RMSProp
+  base_lr: 0.001
+  decay:
+    function: piecewise_decay
+    boundaries: [30000, 50000, 80000, 100000, 150000]
+    decay_rate: 0.3
+
+PostProcess:
+  function: ppocr.postprocess.sast_postprocess,SASTPostProcess
+  score_thresh: 0.5
+  sample_pts_num: 2
+  nms_thresh: 0.2
+  expand_scale: 1.0
+  shrink_ratio_of_width: 0.3
\ No newline at end of file

configs/det/det_r50_vd_sast_totaltext.yml

+Global:
+  algorithm: SAST
+  use_gpu: true
+  epoch_num: 2000
+  log_smooth_window: 20
+  print_batch_step: 2
+  save_model_dir: ./output/det_sast/
+  save_epoch_step: 20
+  eval_batch_step: 5000
+  train_batch_size_per_card: 8
+  test_batch_size_per_card: 1
+  image_shape: [3, 512, 512]
+  reader_yml: ./configs/det/det_sast_totaltext_reader.yml
+  pretrain_weights: ./pretrain_models/ResNet50_vd_ssld_pretrained/
+  save_res_path: ./output/det_sast/predicts_sast.txt
+  checkpoints:
+  save_inference_dir:
+
+Architecture:
+  function: ppocr.modeling.architectures.det_model,DetModel
+
+Backbone:
+  function: ppocr.modeling.backbones.det_resnet_vd_sast,ResNet
+  layers: 50
+
+Head:
+  function: ppocr.modeling.heads.det_sast_head,SASTHead
+  model_name: large
+  only_fpn_up: False
+  # with_cab: False
+  with_cab: True
+
+Loss:
+  function: ppocr.modeling.losses.det_sast_loss,SASTLoss
+
+Optimizer:
+  function: ppocr.optimizer,RMSProp
+  base_lr: 0.001
+  decay:
+    function: piecewise_decay
+    boundaries: [30000, 50000, 80000, 100000, 150000]
+    decay_rate: 0.3
+
+PostProcess:
+  function: ppocr.postprocess.sast_postprocess,SASTPostProcess
+  score_thresh: 0.5
+  sample_pts_num: 6
+  nms_thresh: 0.2
+  expand_scale: 1.2
+  shrink_ratio_of_width: 0.2
\ No newline at end of file

configs/det/det_sast_icdar15_reader.yml

+TrainReader:
+  reader_function: ppocr.data.det.dataset_traversal,TrainReader
+  process_function: ppocr.data.det.sast_process,SASTProcessTrain
+  num_workers: 8
+  img_set_dir: ./train_data/
+  label_file_path: [./train_data/icdar13/train_label_json.txt, ./train_data/icdar15/train_label_json.txt, ./train_data/icdar17_mlt_latin/train_label_json.txt, ./train_data/coco_text_icdar_4pts/train_label_json.txt]
+  data_ratio_list: [0.1, 0.45, 0.3, 0.15]
+  min_crop_side_ratio: 0.3
+  min_crop_size: 24
+  min_text_size: 4
+  max_text_size: 512
+
+EvalReader:
+  reader_function: ppocr.data.det.dataset_traversal,EvalTestReader
+  process_function: ppocr.data.det.sast_process,SASTProcessTest
+  img_set_dir: ./train_data/icdar2015/text_localization/
+  label_file_path: ./train_data/icdar2015/text_localization/test_icdar2015_label.txt
+  max_side_len: 1536
+  
+TestReader:
+  reader_function: ppocr.data.det.dataset_traversal,EvalTestReader
+  process_function: ppocr.data.det.sast_process,SASTProcessTest
+  infer_img: 
+  img_set_dir: ./train_data/icdar2015/text_localization/
+  label_file_path: ./train_data/icdar2015/text_localization/test_icdar2015_label.txt
+  do_eval: True

configs/det/det_sast_totaltext_reader.yml

+TrainReader:
+  reader_function: ppocr.data.det.dataset_traversal,TrainReader
+  process_function: ppocr.data.det.sast_process,SASTProcessTrain
+  num_workers: 8
+  img_set_dir: ./train_data/
+  label_file_path: [./train_data/art_latin_icdar_14pt/train_no_tt_test/train_label_json.txt, ./train_data/total_text_icdar_14pt/train/train_label_json.txt]
+  data_ratio_list: [0.5, 0.5]
+  min_crop_side_ratio: 0.3
+  min_crop_size: 24
+  min_text_size: 4
+  max_text_size: 512
+
+EvalReader:
+  reader_function: ppocr.data.det.dataset_traversal,EvalTestReader
+  process_function: ppocr.data.det.sast_process,SASTProcessTest
+  img_set_dir: ./train_data/afs/
+  label_file_path: ./train_data/afs/total_text/test_label_json.txt
+  max_side_len: 768
+  
+TestReader:
+  reader_function: ppocr.data.det.dataset_traversal,EvalTestReader
+  process_function: ppocr.data.det.sast_process,SASTProcessTest
+  infer_img: 
+  max_side_len: 768

ppocr/data/det/dataset_traversal.py

@@ -31,6 +31,11 @@ class TrainReader(object):
     def __init__(self, params):
         self.num_workers = params['num_workers']
         self.label_file_path = params['label_file_path']
+        print(self.label_file_path)
+        self.use_mul_data = False
+        if isinstance(self.label_file_path, list):
+            self.use_mul_data = True
+            self.data_ratio_list = params['data_ratio_list']
         self.batch_size = params['train_batch_size_per_card']
         assert 'process_function' in params,\
             "absence process_function in Reader"
@@ -43,7 +48,7 @@ class TrainReader(object):
             img_num = len(label_infor_list)
             img_id_list = list(range(img_num))
             random.shuffle(img_id_list)
-            if sys.platform == "win32":
+            if sys.platform == "win32" and self.num_workers != 1:
                 print("multiprocess is not fully compatible with Windows."
                       "num_workers will be 1.")
                 self.num_workers = 1
@@ -54,8 +59,59 @@ class TrainReader(object):
                     continue
                 yield outs
 
+        def sample_iter_reader_mul():
+            batch_size = 1000
+            data_source_list = self.label_file_path
+            batch_size_list = list(map(int, [max(1.0, batch_size * x) for x in self.data_ratio_list]))
+            print(self.data_ratio_list, batch_size_list)
+
+            data_filename_list, data_size_list, fetch_record_list = [], [], []
+            for data_source in data_source_list:
+                image_files = open(data_source, "rb").readlines()
+                random.shuffle(image_files)
+                data_filename_list.append(image_files)
+                data_size_list.append(len(image_files))
+                fetch_record_list.append(0)
+
+            image_batch, poly_batch = [], []
+            # get a batch of img_fns and poly_fns
+            for i in range(0, len(batch_size_list)):
+                bs = batch_size_list[i]
+                ds = data_size_list[i]
+                image_names = data_filename_list[i]
+                fetch_record = fetch_record_list[i]
+                data_path = data_source_list[i]
+                for j in range(fetch_record, fetch_record + bs):
+                    index = j % ds
+                    image_batch.append(image_names[index])
+
+                if (fetch_record + bs) > ds:
+                    fetch_record_list[i] = 0
+                    random.shuffle(data_filename_list[i])
+                else:
+                    fetch_record_list[i] = fetch_record + bs
+
+            if sys.platform == "win32":
+                print("multiprocess is not fully compatible with Windows."
+                      "num_workers will be 1.")
+                self.num_workers = 1
+
+            for label_infor in image_batch:
+                outs = self.process(label_infor)
+                if outs is None:
+                    continue
+                yield outs
+
         def batch_iter_reader():
             batch_outs = []
+            if self.use_mul_data:
+                print("Sample date from multiple datasets!")
+                for outs in sample_iter_reader_mul():
+                    batch_outs.append(outs)
+                    if len(batch_outs) == self.batch_size:
+                        yield batch_outs
+                        batch_outs = []                
+            else:
                 for outs in sample_iter_reader():
                     batch_outs.append(outs)
                     if len(batch_outs) == self.batch_size:

ppocr/modeling/architectures/det_model.py

@@ -97,6 +97,24 @@ class DetModel(object):
                     'shrink_mask':shrink_mask,\
                     'threshold_map':threshold_map,\
                     'threshold_mask':threshold_mask}
+            elif self.algorithm == "SAST":
+                input_score = fluid.layers.data(
+                    name='score', shape=[1, 128, 128], dtype='float32')
+                input_border = fluid.layers.data(
+                    name='border', shape=[5, 128, 128], dtype='float32')
+                input_mask = fluid.layers.data(
+                    name='mask', shape=[1, 128, 128], dtype='float32')
+                input_tvo = fluid.layers.data(
+                    # name='tvo', shape=[5, 128, 128], dtype='float32')
+                    name='tvo', shape=[9, 128, 128], dtype='float32')
+                input_tco = fluid.layers.data(
+                    name='tco', shape=[3, 128, 128], dtype='float32')
+                feed_list = [image, input_score, input_border, input_mask, input_tvo, input_tco]
+                labels = {'input_score': input_score,\
+                    'input_border': input_border,\
+                    'input_mask': input_mask,\
+                    'input_tvo': input_tvo,\
+                    'input_tco': input_tco}
             loader = fluid.io.DataLoader.from_generator(
                 feed_list=feed_list,
                 capacity=64,

ppocr/modeling/backbones/det_resnet_vd_sast.py

+#copyright (c) 2020 PaddlePaddle Authors. All Rights Reserve.
+#
+#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.fluid as fluid
+from paddle.fluid.param_attr import ParamAttr
+
+__all__ = ["ResNet"]
+
+
+class ResNet(object):
+    def __init__(self, params):
+        """
+        the Resnet backbone network for detection module.
+        Args:
+            params(dict): the super parameters for network build
+        """
+        self.layers = params['layers']
+        supported_layers = [18, 34, 50, 101, 152]
+        assert self.layers in supported_layers, \
+            "supported layers are {} but input layer is {}".format(supported_layers, self.layers)
+        self.is_3x3 = True
+
+    def __call__(self, input):
+        layers = self.layers
+        is_3x3 = self.is_3x3
+        # if layers == 18:
+        #     depth = [2, 2, 2, 2]
+        # elif layers == 34 or layers == 50:
+        #     depth = [3, 4, 6, 3]
+        # elif layers == 101:
+        #     depth = [3, 4, 23, 3]
+        # elif layers == 152:
+        #     depth = [3, 8, 36, 3]
+        # elif layers == 200:
+        #     depth = [3, 12, 48, 3]
+        # num_filters = [64, 128, 256, 512]
+        # outs = []
+
+        if layers == 18:
+            depth = [2, 2, 2, 2]#, 3, 3]
+        elif layers == 34 or layers == 50:
+            #depth = [3, 4, 6, 3]#,  3, 3]
+            depth = [3, 4, 6, 3, 3]#, 3]
+        elif layers == 101:
+            depth = [3, 4, 23, 3]#,  3, 3]
+        elif layers == 152:
+            depth = [3, 8, 36, 3]#,  3, 3]
+        num_filters = [64, 128, 256, 512, 512]#, 512]
+        blocks = {}
+
+        idx = 'block_0'
+        blocks[idx] = input
+
+        if is_3x3 == False:
+            conv = self.conv_bn_layer(
+                input=input,
+                num_filters=64,
+                filter_size=7,
+                stride=2,
+                act='relu')
+        else:
+            conv = self.conv_bn_layer(
+                input=input,
+                num_filters=32,
+                filter_size=3,
+                stride=2,
+                act='relu',
+                name='conv1_1')
+            conv = self.conv_bn_layer(
+                input=conv,
+                num_filters=32,
+                filter_size=3,
+                stride=1,
+                act='relu',
+                name='conv1_2')
+            conv = self.conv_bn_layer(
+                input=conv,
+                num_filters=64,
+                filter_size=3,
+                stride=1,
+                act='relu',
+                name='conv1_3')
+        idx = 'block_1'
+        blocks[idx] = conv
+
+        conv = fluid.layers.pool2d(
+            input=conv,
+            pool_size=3,
+            pool_stride=2,
+            pool_padding=1,
+            pool_type='max')
+
+        if layers >= 50:
+            for block in range(len(depth)):
+                for i in range(depth[block]):
+                    if layers in [101, 152, 200] and block == 2:
+                        if i == 0:
+                            conv_name = "res" + str(block + 2) + "a"
+                        else:
+                            conv_name = "res" + str(block + 2) + "b" + str(i)
+                    else:
+                        conv_name = "res" + str(block + 2) + chr(97 + i)
+                    conv = self.bottleneck_block(
+                        input=conv,
+                        num_filters=num_filters[block],
+                        stride=2 if i == 0 and block != 0 else 1,
+                        if_first=block == i == 0,
+                        name=conv_name)
+                # outs.append(conv)
+                idx = 'block_' + str(block + 2)
+                blocks[idx] = conv
+        else:
+            for block in range(len(depth)):
+                for i in range(depth[block]):
+                    conv_name = "res" + str(block + 2) + chr(97 + i)
+                    conv = self.basic_block(
+                        input=conv,
+                        num_filters=num_filters[block],
+                        stride=2 if i == 0 and block != 0 else 1,
+                        if_first=block == i == 0,
+                        name=conv_name)
+                # outs.append(conv)
+                idx = 'block_' + str(block + 2)
+                blocks[idx] = conv
+        # return outs
+        return blocks
+
+    def conv_bn_layer(self,
+                      input,
+                      num_filters,
+                      filter_size,
+                      stride=1,
+                      groups=1,
+                      act=None,
+                      name=None):
+        conv = fluid.layers.conv2d(
+            input=input,
+            num_filters=num_filters,
+            filter_size=filter_size,
+            stride=stride,
+            padding=(filter_size - 1) // 2,
+            groups=groups,
+            act=None,
+            param_attr=ParamAttr(name=name + "_weights"),
+            bias_attr=False)
+        if name == "conv1":
+            bn_name = "bn_" + name
+        else:
+            bn_name = "bn" + name[3:]
+        return fluid.layers.batch_norm(
+            input=conv,
+            act=act,
+            param_attr=ParamAttr(name=bn_name + '_scale'),
+            bias_attr=ParamAttr(bn_name + '_offset'),
+            moving_mean_name=bn_name + '_mean',
+            moving_variance_name=bn_name + '_variance')
+
+    def conv_bn_layer_new(self,
+                          input,
+                          num_filters,
+                          filter_size,
+                          stride=1,
+                          groups=1,
+                          act=None,
+                          name=None):
+        pool = fluid.layers.pool2d(
+            input=input,
+            pool_size=2,
+            pool_stride=2,
+            pool_padding=0,
+            pool_type='avg',
+            ceil_mode=True)
+
+        conv = fluid.layers.conv2d(
+            input=pool,
+            num_filters=num_filters,
+            filter_size=filter_size,
+            stride=1,
+            padding=(filter_size - 1) // 2,
+            groups=groups,
+            act=None,
+            param_attr=ParamAttr(name=name + "_weights"),
+            bias_attr=False)
+        if name == "conv1":
+            bn_name = "bn_" + name
+        else:
+            bn_name = "bn" + name[3:]
+        return fluid.layers.batch_norm(
+            input=conv,
+            act=act,
+            param_attr=ParamAttr(name=bn_name + '_scale'),
+            bias_attr=ParamAttr(bn_name + '_offset'),
+            moving_mean_name=bn_name + '_mean',
+            moving_variance_name=bn_name + '_variance')
+
+    def shortcut(self, input, ch_out, stride, name, if_first=False):
+        ch_in = input.shape[1]
+        if ch_in != ch_out or stride != 1:
+            if if_first:
+                return self.conv_bn_layer(input, ch_out, 1, stride, name=name)
+            else:
+                return self.conv_bn_layer_new(
+                    input, ch_out, 1, stride, name=name)
+        elif if_first:
+            return self.conv_bn_layer(input, ch_out, 1, stride, name=name)
+        else:
+            return input
+
+    def bottleneck_block(self, input, num_filters, stride, name, if_first):
+        conv0 = self.conv_bn_layer(
+            input=input,
+            num_filters=num_filters,
+            filter_size=1,
+            act='relu',
+            name=name + "_branch2a")
+        conv1 = self.conv_bn_layer(
+            input=conv0,
+            num_filters=num_filters,
+            filter_size=3,
+            stride=stride,
+            act='relu',
+            name=name + "_branch2b")
+        conv2 = self.conv_bn_layer(
+            input=conv1,
+            num_filters=num_filters * 4,
+            filter_size=1,
+            act=None,
+            name=name + "_branch2c")
+
+        short = self.shortcut(
+            input,
+            num_filters * 4,
+            stride,
+            if_first=if_first,
+            name=name + "_branch1")
+
+        return fluid.layers.elementwise_add(x=short, y=conv2, act='relu')
+
+    def basic_block(self, input, num_filters, stride, name, if_first):
+        conv0 = self.conv_bn_layer(
+            input=input,
+            num_filters=num_filters,
+            filter_size=3,
+            act='relu',
+            stride=stride,
+            name=name + "_branch2a")
+        conv1 = self.conv_bn_layer(
+            input=conv0,
+            num_filters=num_filters,
+            filter_size=3,
+            act=None,
+            name=name + "_branch2b")
+        short = self.shortcut(
+            input,
+            num_filters,
+            stride,
+            if_first=if_first,
+            name=name + "_branch1")
+        return fluid.layers.elementwise_add(x=short, y=conv1, act='relu')

ppocr/modeling/heads/det_sast_head.py

+#copyright (c) 2020 PaddlePaddle Authors. All Rights Reserve.
+#
+#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.fluid as fluid
+from ..common_functions import conv_bn_layer, deconv_bn_layer
+from collections import OrderedDict
+
+
+class SASTHead(object):
+    """
+    SAST: 
+        see arxiv: https://
+    args:
+        params(dict): the super parameters for network build
+    """
+
+    def __init__(self, params):
+        self.model_name = params['model_name']
+        self.with_cab = params['with_cab']
+
+    def FPN_Up_Fusion(self, blocks):
+        """
+        blocks{}: contain block_2, block_3, block_4, block_5, block_6, block_7 with
+                1/4, 1/8, 1/16, 1/32, 1/64, 1/128 resolution.
+        """
+        f = [blocks['block_6'], blocks['block_5'], blocks['block_4'], blocks['block_3'], blocks['block_2']]
+        num_outputs = [256, 256, 192, 192, 128]
+        g = [None, None, None, None, None]
+        h = [None, None, None, None, None] 
+        for i in range(5):
+            h[i] = conv_bn_layer(input=f[i], num_filters=num_outputs[i],
+                                filter_size=1, stride=1, act=None, name='fpn_up_h'+str(i))
+
+        for i in range(4):
+            if i == 0:
+                g[i] = deconv_bn_layer(input=h[i], num_filters=num_outputs[i + 1], act=None, name='fpn_up_g0')
+                print("g[{}] shape: {}".format(i, g[i].shape))
+            else:
+                g[i] = fluid.layers.elementwise_add(x=g[i - 1], y=h[i])
+                g[i] = fluid.layers.relu(g[i])
+                #g[i] = conv_bn_layer(input=g[i], num_filters=num_outputs[i],
+                #                    filter_size=1, stride=1, act='relu')
+                g[i] = conv_bn_layer(input=g[i], num_filters=num_outputs[i],
+                                    filter_size=3, stride=1, act='relu', name='fpn_up_g%d_1'%i)
+                g[i] = deconv_bn_layer(input=g[i], num_filters=num_outputs[i + 1], act=None, name='fpn_up_g%d_2'%i)
+                print("g[{}] shape: {}".format(i, g[i].shape))
+
+        g[4] = fluid.layers.elementwise_add(x=g[3], y=h[4])
+        g[4] = fluid.layers.relu(g[4])
+        g[4] = conv_bn_layer(input=g[4], num_filters=num_outputs[4],
+                            filter_size=3, stride=1, act='relu', name='fpn_up_fusion_1')
+        g[4] = conv_bn_layer(input=g[4], num_filters=num_outputs[4],
+                            filter_size=1, stride=1, act=None, name='fpn_up_fusion_2')
+        
+        return g[4]
+
+    def FPN_Down_Fusion(self, blocks):
+        """
+        blocks{}: contain block_2, block_3, block_4, block_5, block_6, block_7 with
+                1/4, 1/8, 1/16, 1/32, 1/64, 1/128 resolution.
+        """
+        f = [blocks['block_0'], blocks['block_1'], blocks['block_2']]
+        num_outputs = [32, 64, 128]
+        g = [None, None, None]
+        h = [None, None, None] 
+        for i in range(3):
+            h[i] = conv_bn_layer(input=f[i], num_filters=num_outputs[i],
+                                filter_size=3, stride=1, act=None, name='fpn_down_h'+str(i))
+        for i in range(2):
+            if i == 0:
+                g[i] = conv_bn_layer(input=h[i], num_filters=num_outputs[i+1], filter_size=3, stride=2, act=None, name='fpn_down_g0')
+            else:
+                g[i] = fluid.layers.elementwise_add(x=g[i - 1], y=h[i])
+                g[i] = fluid.layers.relu(g[i])
+                g[i] = conv_bn_layer(input=g[i], num_filters=num_outputs[i], filter_size=3, stride=1, act='relu', name='fpn_down_g%d_1'%i)
+                g[i] = conv_bn_layer(input=g[i], num_filters=num_outputs[i+1], filter_size=3, stride=2, act=None, name='fpn_down_g%d_2'%i)
+            print("g[{}] shape: {}".format(i, g[i].shape)) 
+        g[2] = fluid.layers.elementwise_add(x=g[1], y=h[2])
+        g[2] = fluid.layers.relu(g[2])
+        g[2] = conv_bn_layer(input=g[2], num_filters=num_outputs[2],
+                            filter_size=3, stride=1, act='relu', name='fpn_down_fusion_1')
+        g[2] = conv_bn_layer(input=g[2], num_filters=num_outputs[2],
+                            filter_size=1, stride=1, act=None, name='fpn_down_fusion_2')
+        return g[2]
+
+    def SAST_Header1(self, f_common):
+        """Detector header."""
+        #f_score
+        f_score = conv_bn_layer(input=f_common, num_filters=64, filter_size=1, stride=1, act='relu', name='f_score1')
+        f_score = conv_bn_layer(input=f_score, num_filters=64, filter_size=3, stride=1, act='relu', name='f_score2')
+        f_score = conv_bn_layer(input=f_score, num_filters=128, filter_size=1, stride=1, act='relu', name='f_score3')
+        f_score = conv_bn_layer(input=f_score, num_filters=1, filter_size=3, stride=1, name='f_score4')
+        f_score = fluid.layers.sigmoid(f_score)
+        print("f_score shape: {}".format(f_score.shape))
+
+        #f_boder
+        f_border = conv_bn_layer(input=f_common, num_filters=64, filter_size=1, stride=1, act='relu', name='f_border1')
+        f_border = conv_bn_layer(input=f_border, num_filters=64, filter_size=3, stride=1, act='relu', name='f_border2')
+        f_border = conv_bn_layer(input=f_border, num_filters=128, filter_size=1, stride=1, act='relu', name='f_border3')
+        f_border = conv_bn_layer(input=f_border, num_filters=4, filter_size=3, stride=1, name='f_border4')
+        print("f_border shape: {}".format(f_border.shape))
+        
+        return f_score, f_border
+
+    def SAST_Header2(self, f_common):
+        """Detector header.""" 
+        #f_tvo
+        f_tvo = conv_bn_layer(input=f_common, num_filters=64, filter_size=1, stride=1, act='relu', name='f_tvo1')
+        f_tvo = conv_bn_layer(input=f_tvo, num_filters=64, filter_size=3, stride=1, act='relu', name='f_tvo2')
+        f_tvo = conv_bn_layer(input=f_tvo, num_filters=128, filter_size=1, stride=1, act='relu', name='f_tvo3')
+        f_tvo = conv_bn_layer(input=f_tvo, num_filters=8, filter_size=3, stride=1, name='f_tvo4')
+        print("f_tvo shape: {}".format(f_tvo.shape))
+
+        #f_tco
+        f_tco = conv_bn_layer(input=f_common, num_filters=64, filter_size=1, stride=1, act='relu', name='f_tco1')
+        f_tco = conv_bn_layer(input=f_tco, num_filters=64, filter_size=3, stride=1, act='relu', name='f_tco2')
+        f_tco = conv_bn_layer(input=f_tco, num_filters=128, filter_size=1, stride=1, act='relu', name='f_tco3')
+        f_tco = conv_bn_layer(input=f_tco, num_filters=2, filter_size=3, stride=1, name='f_tco4')
+        print("f_tco shape: {}".format(f_tco.shape))
+        
+        return f_tvo, f_tco
+
+    def cross_attention(self, f_common):
+        """
+        """
+        f_shape = fluid.layers.shape(f_common)
+        f_theta = conv_bn_layer(input=f_common, num_filters=128, filter_size=1, stride=1, act='relu', name='f_theta')
+        f_phi = conv_bn_layer(input=f_common, num_filters=128, filter_size=1, stride=1, act='relu', name='f_phi')
+        f_g = conv_bn_layer(input=f_common, num_filters=128, filter_size=1, stride=1, act='relu', name='f_g')
+        ### horizon
+        fh_theta = f_theta
+        fh_phi = f_phi
+        fh_g = f_g
+        #flatten
+        fh_theta = fluid.layers.transpose(fh_theta, [0, 2, 3, 1])
+        fh_theta = fluid.layers.reshape(fh_theta, [f_shape[0] * f_shape[2], f_shape[3], 128])
+        fh_phi = fluid.layers.transpose(fh_phi, [0, 2, 3, 1])
+        fh_phi = fluid.layers.reshape(fh_phi, [f_shape[0] * f_shape[2], f_shape[3], 128])
+        fh_g = fluid.layers.transpose(fh_g, [0, 2, 3, 1])
+        fh_g = fluid.layers.reshape(fh_g, [f_shape[0] * f_shape[2], f_shape[3], 128])
+        #correlation
+        fh_attn = fluid.layers.matmul(fh_theta, fluid.layers.transpose(fh_phi, [0, 2, 1]))
+        #scale
+        fh_attn = fh_attn / (128 ** 0.5)
+        fh_attn = fluid.layers.softmax(fh_attn)
+        #weighted sum
+        fh_weight = fluid.layers.matmul(fh_attn, fh_g)
+        fh_weight = fluid.layers.reshape(fh_weight, [f_shape[0], f_shape[2], f_shape[3], 128])
+        print("fh_weight: {}".format(fh_weight.shape))
+        fh_weight = fluid.layers.transpose(fh_weight, [0, 3, 1, 2])
+        fh_weight = conv_bn_layer(input=fh_weight, num_filters=128, filter_size=1, stride=1, name='fh_weight')
+        #short cut
+        fh_sc = conv_bn_layer(input=f_common, num_filters=128, filter_size=1, stride=1, name='fh_sc')
+        f_h = fluid.layers.relu(fh_weight + fh_sc)
+        ######
+        #vertical
+        fv_theta = fluid.layers.transpose(f_theta, [0, 1, 3, 2])
+        fv_phi = fluid.layers.transpose(f_phi, [0, 1, 3, 2])
+        fv_g = fluid.layers.transpose(f_g, [0, 1, 3, 2])
+        #flatten
+        fv_theta = fluid.layers.transpose(fv_theta, [0, 2, 3, 1])
+        fv_theta = fluid.layers.reshape(fv_theta, [f_shape[0] * f_shape[3], f_shape[2], 128])
+        fv_phi = fluid.layers.transpose(fv_phi, [0, 2, 3, 1])
+        fv_phi = fluid.layers.reshape(fv_phi, [f_shape[0] * f_shape[3], f_shape[2], 128])
+        fv_g = fluid.layers.transpose(fv_g, [0, 2, 3, 1])
+        fv_g = fluid.layers.reshape(fv_g, [f_shape[0] * f_shape[3], f_shape[2], 128])
+        #correlation
+        fv_attn = fluid.layers.matmul(fv_theta, fluid.layers.transpose(fv_phi, [0, 2, 1]))
+        #scale
+        fv_attn = fv_attn / (128 ** 0.5)
+        fv_attn = fluid.layers.softmax(fv_attn)
+        #weighted sum
+        fv_weight = fluid.layers.matmul(fv_attn, fv_g)
+        fv_weight = fluid.layers.reshape(fv_weight, [f_shape[0], f_shape[3], f_shape[2], 128])
+        print("fv_weight: {}".format(fv_weight.shape))
+        fv_weight = fluid.layers.transpose(fv_weight, [0, 3, 2, 1])
+        fv_weight = conv_bn_layer(input=fv_weight, num_filters=128, filter_size=1, stride=1, name='fv_weight')
+        #short cut
+        fv_sc = conv_bn_layer(input=f_common, num_filters=128, filter_size=1, stride=1, name='fv_sc')
+        f_v = fluid.layers.relu(fv_weight + fv_sc)
+        ######
+        f_attn = fluid.layers.concat([f_h, f_v], axis=1)
+        f_attn = conv_bn_layer(input=f_attn, num_filters=128, filter_size=1, stride=1, act='relu', name='f_attn')  
+        return f_attn
+        
+    def __call__(self, blocks, with_cab=False):
+        for k, v in blocks.items():
+            print(k, v.shape)
+
+        #down fpn
+        f_down = self.FPN_Down_Fusion(blocks)
+        print("f_down shape: {}".format(f_down.shape))
+        #up fpn
+        f_up = self.FPN_Up_Fusion(blocks)
+        print("f_up shape: {}".format(f_up.shape))
+        #fusion
+        f_common = fluid.layers.elementwise_add(x=f_down, y=f_up)
+        f_common = fluid.layers.relu(f_common)
+        print("f_common: {}".format(f_common.shape))
+        
+        if self.with_cab:
+            print('enhence f_common with CAB.')
+            f_common = self.cross_attention(f_common)
+            
+        f_score, f_border= self.SAST_Header1(f_common)
+        f_tvo, f_tco = self.SAST_Header2(f_common)
+
+        predicts = OrderedDict()
+        predicts['f_score'] = f_score
+        predicts['f_border'] = f_border
+        predicts['f_tvo'] = f_tvo
+        predicts['f_tco'] = f_tco
+        return predicts
\ No newline at end of file

ppocr/modeling/losses/det_sast_loss.py

+#copyright (c) 2020 PaddlePaddle Authors. All Rights Reserve.
+#
+#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.fluid as fluid
+
+
+class SASTLoss(object):
+    """
+    SAST Loss function
+    """
+
+    def __init__(self, params=None):
+        super(SASTLoss, self).__init__()
+
+    def __call__(self, predicts, labels):
+        """
+        tcl_pos: N x 128 x 3
+        tcl_mask: N x 128 x 1
+        tcl_label: N x X list or LoDTensor
+        """
+                
+        f_score = predicts['f_score']
+        f_border = predicts['f_border']
+        f_tvo = predicts['f_tvo']
+        f_tco = predicts['f_tco']
+
+        l_score = labels['input_score']
+        l_border = labels['input_border']
+        l_mask = labels['input_mask']
+        l_tvo = labels['input_tvo']
+        l_tco = labels['input_tco']
+
+        #score_loss
+        intersection = fluid.layers.reduce_sum(f_score * l_score * l_mask)
+        union = fluid.layers.reduce_sum(f_score * l_mask) + fluid.layers.reduce_sum(l_score * l_mask)
+        score_loss = 1.0 - 2 * intersection / (union + 1e-5)
+
+        #border loss
+        l_border_split, l_border_norm = fluid.layers.split(l_border, num_or_sections=[4, 1], dim=1)
+        f_border_split = f_border
+        l_border_norm_split = fluid.layers.expand(x=l_border_norm, expand_times=[1, 4, 1, 1])
+        l_border_score = fluid.layers.expand(x=l_score, expand_times=[1, 4, 1, 1])   
+        l_border_mask = fluid.layers.expand(x=l_mask, expand_times=[1, 4, 1, 1])   
+        border_diff = l_border_split - f_border_split
+        abs_border_diff = fluid.layers.abs(border_diff) 
+        border_sign = abs_border_diff < 1.0
+        border_sign = fluid.layers.cast(border_sign, dtype='float32')
+        border_sign.stop_gradient = True
+        border_in_loss = 0.5 * abs_border_diff * abs_border_diff * border_sign + \
+                    (abs_border_diff - 0.5) * (1.0 - border_sign)
+        border_out_loss = l_border_norm_split * border_in_loss
+        border_loss = fluid.layers.reduce_sum(border_out_loss * l_border_score * l_border_mask) / \
+                    (fluid.layers.reduce_sum(l_border_score * l_border_mask) + 1e-5)
+
+        #tvo_loss
+        l_tvo_split, l_tvo_norm = fluid.layers.split(l_tvo, num_or_sections=[8, 1], dim=1)
+        f_tvo_split = f_tvo
+        l_tvo_norm_split = fluid.layers.expand(x=l_tvo_norm, expand_times=[1, 8, 1, 1])
+        l_tvo_score = fluid.layers.expand(x=l_score, expand_times=[1, 8, 1, 1])   
+        l_tvo_mask = fluid.layers.expand(x=l_mask, expand_times=[1, 8, 1, 1])   
+        #
+        tvo_geo_diff = l_tvo_split - f_tvo_split
+        abs_tvo_geo_diff = fluid.layers.abs(tvo_geo_diff) 
+        tvo_sign = abs_tvo_geo_diff < 1.0
+        tvo_sign = fluid.layers.cast(tvo_sign, dtype='float32')
+        tvo_sign.stop_gradient = True
+        tvo_in_loss = 0.5 * abs_tvo_geo_diff * abs_tvo_geo_diff * tvo_sign + \
+                    (abs_tvo_geo_diff - 0.5) * (1.0 - tvo_sign)
+        tvo_out_loss = l_tvo_norm_split * tvo_in_loss
+        tvo_loss = fluid.layers.reduce_sum(tvo_out_loss * l_tvo_score * l_tvo_mask) / \
+                    (fluid.layers.reduce_sum(l_tvo_score * l_tvo_mask) + 1e-5)
+
+        #tco_loss
+        l_tco_split, l_tco_norm = fluid.layers.split(l_tco, num_or_sections=[2, 1], dim=1)
+        f_tco_split = f_tco
+        l_tco_norm_split = fluid.layers.expand(x=l_tco_norm, expand_times=[1, 2, 1, 1])
+        l_tco_score = fluid.layers.expand(x=l_score, expand_times=[1, 2, 1, 1])   
+        l_tco_mask = fluid.layers.expand(x=l_mask, expand_times=[1, 2, 1, 1])   
+        #
+        tco_geo_diff = l_tco_split - f_tco_split
+        abs_tco_geo_diff = fluid.layers.abs(tco_geo_diff) 
+        tco_sign = abs_tco_geo_diff < 1.0
+        tco_sign = fluid.layers.cast(tco_sign, dtype='float32')
+        tco_sign.stop_gradient = True
+        tco_in_loss = 0.5 * abs_tco_geo_diff * abs_tco_geo_diff * tco_sign + \
+                    (abs_tco_geo_diff - 0.5) * (1.0 - tco_sign)
+        tco_out_loss = l_tco_norm_split * tco_in_loss
+        tco_loss = fluid.layers.reduce_sum(tco_out_loss * l_tco_score * l_tco_mask) / \
+                    (fluid.layers.reduce_sum(l_tco_score * l_tco_mask) + 1e-5)
+
+
+        # total loss
+        tvo_lw, tco_lw = 1.5, 1.5
+        score_lw, border_lw = 1.0, 1.0
+        total_loss = score_loss * score_lw + border_loss * border_lw + \
+                    tvo_loss * tvo_lw + tco_loss * tco_lw
+                    
+        losses = {'total_loss':total_loss, "score_loss":score_loss,\
+            "border_loss":border_loss, 'tvo_loss':tvo_loss, 'tco_loss':tco_loss}
+        return losses
\ No newline at end of file

ppocr/optimizer.py

@@ -36,17 +36,28 @@ def AdamDecay(params, parameter_list=None):
     l2_decay = params.get("l2_decay", 0.0)
 
     if 'decay' in params:
+        supported_decay_mode = ["cosine_decay", "piecewise_decay"]
         params = params['decay']
         decay_mode = params['function']
+        assert decay_mode in supported_decay_mode, "Supported decay mode is {}, but got {}".format(
+            supported_decay_mode, decay_mode)
+
+        if decay_mode == "cosine_decay":
             step_each_epoch = params['step_each_epoch']
             total_epoch = params['total_epoch']
-        if decay_mode == "cosine_decay":
             base_lr = fluid.layers.cosine_decay(
                 learning_rate=base_lr,
                 step_each_epoch=step_each_epoch,
                 epochs=total_epoch)
-        else:
-            logger.info("Only support Cosine decay currently")
+        elif decay_mode == "piecewise_decay":
+            boundaries = params["boundaries"]
+            decay_rate = params["decay_rate"]
+            values = [
+                base_lr * decay_rate**idx
+                for idx in range(len(boundaries) + 1)
+            ]
+            base_lr = fluid.layers.piecewise_decay(boundaries, values)
+
     optimizer = fluid.optimizer.Adam(
         learning_rate=base_lr,
         beta1=beta1,
@@ -54,3 +65,44 @@ def AdamDecay(params, parameter_list=None):
         regularization=L2Decay(regularization_coeff=l2_decay),
         parameter_list=parameter_list)
     return optimizer
+
+
+def RMSProp(params, parameter_list=None):
+    """
+    define optimizer function
+    args:
+        params(dict): the super parameters
+        parameter_list (list): list of Variable names to update to minimize loss
+    return:
+    """
+    base_lr = params.get("base_lr", 0.001)
+    l2_decay = params.get("l2_decay", 0.00005)
+
+    if 'decay' in params:
+        supported_decay_mode = ["cosine_decay", "piecewise_decay"]
+        params = params['decay']
+        decay_mode = params['function']
+        assert decay_mode in supported_decay_mode, "Supported decay mode is {}, but got {}".format(
+            supported_decay_mode, decay_mode)
+
+        if decay_mode == "cosine_decay":
+            step_each_epoch = params['step_each_epoch']
+            total_epoch = params['total_epoch']
+            base_lr = fluid.layers.cosine_decay(
+                learning_rate=base_lr,
+                step_each_epoch=step_each_epoch,
+                epochs=total_epoch)
+        elif decay_mode == "piecewise_decay":
+            boundaries = params["boundaries"]
+            decay_rate = params["decay_rate"]
+            values = [
+                base_lr * decay_rate**idx
+                for idx in range(len(boundaries) + 1)
+            ]
+            base_lr = fluid.layers.piecewise_decay(boundaries, values)
+
+    optimizer = fluid.optimizer.RMSProp(
+        learning_rate=base_lr,
+        regularization=fluid.regularizer.L2Decay(regularization_coeff=l2_decay))
+        
+    return optimizer
\ No newline at end of file

ppocr/postprocess/sast_postprocess.py

+# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import os
+import sys
+__dir__ = os.path.dirname(__file__)
+sys.path.append(__dir__)
+sys.path.append(os.path.join(__dir__, '..'))
+
+import numpy as np
+from .locality_aware_nms import nms_locality
+# import lanms
+import cv2
+import time
+
+
+class SASTPostProcess(object):
+    """
+    The post process for SAST.
+    """
+
+    def __init__(self, params):
+        self.score_thresh = params.get('score_thresh', 0.5)
+        self.nms_thresh = params.get('nms_thresh', 0.2)
+        self.sample_pts_num = params.get('sample_pts_num', 2)
+        self.shrink_ratio_of_width = params.get('shrink_ratio_of_width', 0.3)
+        self.expand_scale = params.get('expand_scale', 1.0)
+        self.tcl_map_thresh = 0.5
+        
+        # c++ la-nms is faster, but only support python 3.5
+        self.is_python35 = False
+        if sys.version_info.major == 3 and sys.version_info.minor == 5:
+            self.is_python35 = True
+            
+    def point_pair2poly(self, point_pair_list):
+        """
+        Transfer vertical point_pairs into poly point in clockwise.
+        """
+        # constract poly
+        point_num = len(point_pair_list) * 2
+        point_list = [0] * point_num
+        for idx, point_pair in enumerate(point_pair_list):
+            point_list[idx] = point_pair[0]
+            point_list[point_num - 1 - idx] = point_pair[1]
+        return np.array(point_list).reshape(-1, 2)
+    
+    def shrink_quad_along_width(self, quad, begin_width_ratio=0., end_width_ratio=1.):
+        """ 
+        Generate shrink_quad_along_width.
+        """
+        ratio_pair = np.array([[begin_width_ratio], [end_width_ratio]], dtype=np.float32)
+        p0_1 = quad[0] + (quad[1] - quad[0]) * ratio_pair
+        p3_2 = quad[3] + (quad[2] - quad[3]) * ratio_pair
+        return np.array([p0_1[0], p0_1[1], p3_2[1], p3_2[0]])
+    
+    def expand_poly_along_width(self, poly, shrink_ratio_of_width=0.3):
+        """
+        expand poly along width.
+        """
+        point_num = poly.shape[0]
+        left_quad = np.array([poly[0], poly[1], poly[-2], poly[-1]], dtype=np.float32)
+        left_ratio = -shrink_ratio_of_width * np.linalg.norm(left_quad[0] - left_quad[3]) / \
+                    (np.linalg.norm(left_quad[0] - left_quad[1]) + 1e-6)
+        left_quad_expand = self.shrink_quad_along_width(left_quad, left_ratio, 1.0)
+        right_quad = np.array([poly[point_num // 2 - 2], poly[point_num // 2 - 1],
+                            poly[point_num // 2], poly[point_num // 2 + 1]], dtype=np.float32)
+        right_ratio = 1.0 + \
+                    shrink_ratio_of_width * np.linalg.norm(right_quad[0] - right_quad[3]) / \
+                    (np.linalg.norm(right_quad[0] - right_quad[1]) + 1e-6)
+        right_quad_expand = self.shrink_quad_along_width(right_quad, 0.0, right_ratio)
+        poly[0] = left_quad_expand[0]
+        poly[-1] = left_quad_expand[-1]
+        poly[point_num // 2 - 1] = right_quad_expand[1]
+        poly[point_num // 2] = right_quad_expand[2]
+        return poly
+
+    def restore_quad(self, tcl_map, tcl_map_thresh, tvo_map):
+        """Restore quad."""
+        xy_text = np.argwhere(tcl_map[:, :, 0] > tcl_map_thresh)
+        xy_text = xy_text[:, ::-1] # (n, 2)
+
+        # Sort the text boxes via the y axis
+        xy_text = xy_text[np.argsort(xy_text[:, 1])]
+
+        scores = tcl_map[xy_text[:, 1], xy_text[:, 0], 0]
+        scores = scores[:, np.newaxis]
+
+        # Restore
+        point_num = int(tvo_map.shape[-1] / 2)
+        assert point_num == 4
+        tvo_map = tvo_map[xy_text[:, 1], xy_text[:, 0], :]
+        xy_text_tile = np.tile(xy_text, (1, point_num)) # (n, point_num * 2)
+        quads = xy_text_tile - tvo_map
+
+        return scores, quads, xy_text
+
+    def quad_area(self, quad):
+        """
+        compute area of a quad.
+        """
+        edge = [
+            (quad[1][0] - quad[0][0]) * (quad[1][1] + quad[0][1]),
+            (quad[2][0] - quad[1][0]) * (quad[2][1] + quad[1][1]),
+            (quad[3][0] - quad[2][0]) * (quad[3][1] + quad[2][1]),
+            (quad[0][0] - quad[3][0]) * (quad[0][1] + quad[3][1])
+        ]
+        return np.sum(edge) / 2.
+        
+    def nms(self, dets):
+        if self.is_python35:
+            import lanms
+            dets = lanms.merge_quadrangle_n9(dets, self.nms_thresh)
+        else:
+            dets = nms_locality(dets, self.nms_thresh)
+        return dets
+
+    def cluster_by_quads_tco(self, tcl_map, tcl_map_thresh, quads, tco_map):
+        """
+        Cluster pixels in tcl_map based on quads.
+        """
+        instance_count = quads.shape[0] + 1 # contain background
+        instance_label_map = np.zeros(tcl_map.shape[:2], dtype=np.int32)
+        if instance_count == 1:
+            return instance_count, instance_label_map
+
+        # predict text center
+        xy_text = np.argwhere(tcl_map[:, :, 0] > tcl_map_thresh)
+        n = xy_text.shape[0]
+        xy_text = xy_text[:, ::-1] # (n, 2)
+        tco = tco_map[xy_text[:, 1], xy_text[:, 0], :] # (n, 2)
+        pred_tc = xy_text - tco
+        
+        # get gt text center
+        m = quads.shape[0]
+        gt_tc = np.mean(quads, axis=1) # (m, 2)
+
+        pred_tc_tile = np.tile(pred_tc[:, np.newaxis, :], (1, m, 1)) # (n, m, 2)
+        gt_tc_tile = np.tile(gt_tc[np.newaxis, :, :], (n, 1, 1)) # (n, m, 2)
+        dist_mat = np.linalg.norm(pred_tc_tile - gt_tc_tile, axis=2) # (n, m)
+        xy_text_assign = np.argmin(dist_mat, axis=1) + 1 # (n,)
+
+        instance_label_map[xy_text[:, 1], xy_text[:, 0]] = xy_text_assign
+        return instance_count, instance_label_map
+
+    def estimate_sample_pts_num(self, quad, xy_text):
+        """
+        Estimate sample points number.
+        """
+        eh = (np.linalg.norm(quad[0] - quad[3]) + np.linalg.norm(quad[1] - quad[2])) / 2.0
+        ew = (np.linalg.norm(quad[0] - quad[1]) + np.linalg.norm(quad[2] - quad[3])) / 2.0
+
+        dense_sample_pts_num = max(2, int(ew))
+        dense_xy_center_line = xy_text[np.linspace(0, xy_text.shape[0] - 1, dense_sample_pts_num,
+                                                endpoint=True, dtype=np.float32).astype(np.int32)]
+
+        dense_xy_center_line_diff = dense_xy_center_line[1:] - dense_xy_center_line[:-1]
+        estimate_arc_len = np.sum(np.linalg.norm(dense_xy_center_line_diff, axis=1))
+
+        sample_pts_num = max(2, int(estimate_arc_len / eh))
+        return sample_pts_num
+
+    def detect_sast(self, tcl_map, tvo_map, tbo_map, tco_map, ratio_w, ratio_h, src_w, src_h, 
+                shrink_ratio_of_width=0.3, tcl_map_thresh=0.5, offset_expand=1.0, out_strid=4.0):
+        """
+        first resize the tcl_map, tvo_map and tbo_map to the input_size, then restore the polys
+        """
+        # restore quad
+        scores, quads, xy_text = self.restore_quad(tcl_map, tcl_map_thresh, tvo_map)
+        dets = np.hstack((quads, scores)).astype(np.float32, copy=False)
+        dets = self.nms(dets)
+        if dets.shape[0] == 0:
+            return []
+        quads = dets[:, :-1].reshape(-1, 4, 2)
+
+        # Compute quad area
+        quad_areas = []
+        for quad in quads:
+            quad_areas.append(-self.quad_area(quad))
+
+        # instance segmentation
+        # instance_count, instance_label_map = cv2.connectedComponents(tcl_map.astype(np.uint8), connectivity=8)
+        instance_count, instance_label_map = self.cluster_by_quads_tco(tcl_map, tcl_map_thresh, quads, tco_map)
+
+        # restore single poly with tcl instance.
+        poly_list = []
+        for instance_idx in range(1, instance_count):
+            xy_text = np.argwhere(instance_label_map == instance_idx)[:, ::-1]
+            quad = quads[instance_idx - 1]
+            q_area = quad_areas[instance_idx - 1]
+            if q_area < 5:
+                continue
+            
+            #
+            len1 = float(np.linalg.norm(quad[0] -quad[1]))
+            len2 = float(np.linalg.norm(quad[1] -quad[2]))
+            min_len = min(len1, len2)
+            if min_len < 3:
+                continue
+
+            # filter small CC
+            if xy_text.shape[0] <= 0:
+                continue
+
+            # filter low confidence instance
+            xy_text_scores = tcl_map[xy_text[:, 1], xy_text[:, 0], 0] 
+            if np.sum(xy_text_scores) / quad_areas[instance_idx - 1] < 0.1:
+            # if np.sum(xy_text_scores) / quad_areas[instance_idx - 1] < 0.05:
+                continue
+
+            # sort xy_text
+            left_center_pt = np.array([[(quad[0, 0] + quad[-1, 0]) / 2.0,
+                                        (quad[0, 1] + quad[-1, 1]) / 2.0]]) # (1, 2)
+            right_center_pt = np.array([[(quad[1, 0] + quad[2, 0]) / 2.0,
+                                        (quad[1, 1] + quad[2, 1]) / 2.0]]) # (1, 2)
+            proj_unit_vec = (right_center_pt - left_center_pt) / \
+                            (np.linalg.norm(right_center_pt - left_center_pt) + 1e-6)
+            proj_value = np.sum(xy_text * proj_unit_vec, axis=1)
+            xy_text = xy_text[np.argsort(proj_value)]
+
+            # Sample pts in tcl map
+            if self.sample_pts_num == 0:
+                sample_pts_num = self.estimate_sample_pts_num(quad, xy_text)
+            else:
+                sample_pts_num = self.sample_pts_num
+            xy_center_line = xy_text[np.linspace(0, xy_text.shape[0] - 1, sample_pts_num,
+                                                endpoint=True, dtype=np.float32).astype(np.int32)]
+
+            point_pair_list = []
+            for x, y in xy_center_line:
+                # get corresponding offset
+                offset = tbo_map[y, x, :].reshape(2, 2)
+                if offset_expand != 1.0:
+                    offset_length = np.linalg.norm(offset, axis=1, keepdims=True)
+                    expand_length = np.clip(offset_length * (offset_expand - 1), a_min=0.5, a_max=3.0)
+                    offset_detal = offset / offset_length * expand_length
+                    offset = offset + offset_detal                
+                # original point
+                ori_yx = np.array([y, x], dtype=np.float32)
+                point_pair = (ori_yx +  offset)[:, ::-1]* out_strid / np.array([ratio_w, ratio_h]).reshape(-1, 2) 
+                point_pair_list.append(point_pair)
+
+            # ndarry: (x, 2), expand poly along width
+            detected_poly = self.point_pair2poly(point_pair_list)
+            detected_poly = self.expand_poly_along_width(detected_poly, shrink_ratio_of_width)
+            detected_poly[:, 0] = np.clip(detected_poly[:, 0], a_min=0, a_max=src_w)
+            detected_poly[:, 1] = np.clip(detected_poly[:, 1], a_min=0, a_max=src_h)
+            poly_list.append(detected_poly)
+
+        return poly_list
+
+    def __call__(self, outs_dict, ratio_list):                
+        score_list = outs_dict['f_score']
+        border_list = outs_dict['f_border']
+        tvo_list = outs_dict['f_tvo']
+        tco_list = outs_dict['f_tco']
+                    
+        img_num = len(ratio_list)
+        poly_lists = []
+        for ino in range(img_num):
+            p_score = score_list[ino].transpose((1,2,0))
+            p_border = border_list[ino].transpose((1,2,0))
+            p_tvo = tvo_list[ino].transpose((1,2,0))
+            p_tco = tco_list[ino].transpose((1,2,0))
+            # print(p_score.shape, p_border.shape, p_tvo.shape, p_tco.shape)
+            ratio_h, ratio_w, src_h, src_w = ratio_list[ino]
+
+            poly_list = self.detect_sast(p_score, p_tvo, p_border, p_tco, ratio_w, ratio_h, src_w, src_h, 
+                                         shrink_ratio_of_width=self.shrink_ratio_of_width, 
+                                         tcl_map_thresh=self.tcl_map_thresh, offset_expand=self.expand_scale)
+
+            poly_lists.append(poly_list)
+
+        return poly_lists
+

ppocr/utils/save_load.py

@@ -21,7 +21,6 @@ import os
 import shutil
 import tempfile
 
-import paddle
 import paddle.fluid as fluid
 
 from .utility import initial_logger
@@ -110,17 +109,20 @@ def init_model(config, program, exe):
     """
     checkpoints = config['Global'].get('checkpoints')
     if checkpoints:
+        if os.path.exists(checkpoints + '.pdparams'):
             path = checkpoints
             fluid.load(program, path, exe)
             logger.info("Finish initing model from {}".format(path))
-        return
-
+        else:
+            raise ValueError("Model checkpoints {} does not exists,"
+                             "check if you lost the file prefix.".format(
+                                 checkpoints + '.pdparams'))
+    else:
         pretrain_weights = config['Global'].get('pretrain_weights')
         if pretrain_weights:
             path = pretrain_weights
             load_params(exe, program, path)
             logger.info("Finish initing model from {}".format(path))
-    return
 
 
 def save_model(program, model_path):

tools/eval.py

@@ -58,7 +58,7 @@ def main():
     program.check_gpu(use_gpu)
 
     alg = config['Global']['algorithm']
-    assert alg in ['EAST', 'DB', 'Rosetta', 'CRNN', 'STARNet', 'RARE']
+    assert alg in ['EAST', 'DB', 'Rosetta', 'CRNN', 'STARNet', 'RARE', 'SAST']
     if alg in ['Rosetta', 'CRNN', 'STARNet', 'RARE']:
         config['Global']['char_ops'] = CharacterOps(config['Global'])
 
@@ -75,7 +75,7 @@ def main():
 
     init_model(config, eval_program, exe)
 
-    if alg in ['EAST', 'DB']:
+    if alg in ['EAST', 'DB', 'SAST']:
         eval_reader = reader_main(config=config, mode="eval")
         eval_info_dict = {'program':eval_program,\
             'reader':eval_reader,\

tools/eval_utils/eval_det_iou.py

@@ -88,8 +88,8 @@ class DetectionIoUEvaluator(object):
             points = gt[n]['points']
             # transcription = gt[n]['text']
             dontCare = gt[n]['ignore']
-            points = Polygon(points)
-            points = points.buffer(0)
+#             points = Polygon(points)
+#             points = points.buffer(0)
             if not Polygon(points).is_valid or not Polygon(points).is_simple:
                 continue
 
@@ -105,8 +105,8 @@ class DetectionIoUEvaluator(object):
 
         for n in range(len(pred)):
             points = pred[n]['points']
-            points = Polygon(points)
-            points = points.buffer(0)
+#             points = Polygon(points)
+#             points = points.buffer(0)
             if not Polygon(points).is_valid or not Polygon(points).is_simple:
                 continue