mirror of
https://github.com/PaddlePaddle/PaddleOCR.git
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272 lines
8.6 KiB
Python
Executable File
272 lines
8.6 KiB
Python
Executable File
#copyright (c) 2020 PaddlePaddle Authors. All Rights Reserve.
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#
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#Licensed under the Apache License, Version 2.0 (the "License");
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#you may not use this file except in compliance with the License.
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#You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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#Unless required by applicable law or agreed to in writing, software
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#distributed under the License is distributed on an "AS IS" BASIS,
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#WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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#See the License for the specific language governing permissions and
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#limitations under the License.
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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import math
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import paddle
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import paddle.fluid as fluid
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from paddle.fluid.param_attr import ParamAttr
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__all__ = [
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"ResNet", "ResNet18_vd", "ResNet34_vd", "ResNet50_vd", "ResNet101_vd",
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"ResNet152_vd", "ResNet200_vd"
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]
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class ResNet():
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def __init__(self, params):
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self.layers = params['layers']
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self.is_3x3 = True
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supported_layers = [18, 34, 50, 101, 152, 200]
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assert self.layers in supported_layers, \
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"supported layers are {} but input layer is {}".format(supported_layers, self.layers)
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def __call__(self, input):
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is_3x3 = self.is_3x3
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layers = self.layers
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if layers == 18:
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depth = [2, 2, 2, 2]
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elif layers == 34 or layers == 50:
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depth = [3, 4, 6, 3]
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elif layers == 101:
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depth = [3, 4, 23, 3]
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elif layers == 152:
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depth = [3, 8, 36, 3]
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elif layers == 200:
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depth = [3, 12, 48, 3]
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num_filters = [64, 128, 256, 512]
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if is_3x3 == False:
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conv = self.conv_bn_layer(
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input=input,
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num_filters=64,
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filter_size=7,
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stride=1,
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act='relu')
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else:
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conv = self.conv_bn_layer(
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input=input,
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num_filters=32,
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filter_size=3,
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stride=1,
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act='relu',
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name='conv1_1')
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conv = self.conv_bn_layer(
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input=conv,
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num_filters=32,
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filter_size=3,
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stride=1,
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act='relu',
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name='conv1_2')
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conv = self.conv_bn_layer(
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input=conv,
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num_filters=64,
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filter_size=3,
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stride=1,
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act='relu',
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name='conv1_3')
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conv = fluid.layers.pool2d(
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input=conv,
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pool_size=3,
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pool_stride=2,
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pool_padding=1,
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pool_type='max')
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if layers >= 50:
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for block in range(len(depth)):
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for i in range(depth[block]):
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if layers in [101, 152, 200] and block == 2:
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if i == 0:
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conv_name = "res" + str(block + 2) + "a"
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else:
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conv_name = "res" + str(block + 2) + "b" + str(i)
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else:
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conv_name = "res" + str(block + 2) + chr(97 + i)
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if i == 0 and block != 0:
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stride = (2, 1)
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else:
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stride = (1, 1)
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conv = self.bottleneck_block(
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input=conv,
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num_filters=num_filters[block],
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stride=stride,
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if_first=block == i == 0,
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name=conv_name)
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else:
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for block in range(len(depth)):
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for i in range(depth[block]):
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conv_name = "res" + str(block + 2) + chr(97 + i)
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if i == 0 and block != 0:
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stride = (2, 1)
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else:
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stride = (1, 1)
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conv = self.basic_block(
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input=conv,
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num_filters=num_filters[block],
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stride=stride,
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if_first=block == i == 0,
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name=conv_name)
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conv = fluid.layers.pool2d(
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input=conv,
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pool_size=2,
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pool_stride=2,
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pool_padding=0,
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pool_type='max')
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return conv
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def conv_bn_layer(self,
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input,
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num_filters,
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filter_size,
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stride=1,
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groups=1,
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act=None,
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name=None):
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conv = fluid.layers.conv2d(
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input=input,
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num_filters=num_filters,
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filter_size=filter_size,
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stride=stride,
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padding=(filter_size - 1) // 2,
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groups=groups,
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act=None,
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param_attr=ParamAttr(name=name + "_weights"),
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bias_attr=False)
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if name == "conv1":
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bn_name = "bn_" + name
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else:
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bn_name = "bn" + name[3:]
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return fluid.layers.batch_norm(
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input=conv,
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act=act,
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param_attr=ParamAttr(name=bn_name + '_scale'),
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bias_attr=ParamAttr(bn_name + '_offset'),
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moving_mean_name=bn_name + '_mean',
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moving_variance_name=bn_name + '_variance')
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def conv_bn_layer_new(self,
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input,
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num_filters,
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filter_size,
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stride=1,
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groups=1,
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act=None,
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name=None):
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pool = fluid.layers.pool2d(
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input=input,
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pool_size=stride,
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pool_stride=stride,
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pool_padding=0,
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pool_type='avg',
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ceil_mode=True)
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conv = fluid.layers.conv2d(
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input=pool,
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num_filters=num_filters,
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filter_size=filter_size,
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stride=1,
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padding=(filter_size - 1) // 2,
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groups=groups,
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act=None,
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param_attr=ParamAttr(name=name + "_weights"),
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bias_attr=False)
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if name == "conv1":
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bn_name = "bn_" + name
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else:
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bn_name = "bn" + name[3:]
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return fluid.layers.batch_norm(
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input=conv,
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act=act,
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param_attr=ParamAttr(name=bn_name + '_scale'),
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bias_attr=ParamAttr(bn_name + '_offset'),
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moving_mean_name=bn_name + '_mean',
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moving_variance_name=bn_name + '_variance')
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def shortcut(self, input, ch_out, stride, name, if_first=False):
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ch_in = input.shape[1]
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if ch_in != ch_out or stride[0] != 1:
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if if_first:
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return self.conv_bn_layer(input, ch_out, 1, stride, name=name)
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else:
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return self.conv_bn_layer_new(
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input, ch_out, 1, stride, name=name)
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elif if_first:
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return self.conv_bn_layer(input, ch_out, 1, stride, name=name)
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else:
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return input
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def bottleneck_block(self, input, num_filters, stride, name, if_first):
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conv0 = self.conv_bn_layer(
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input=input,
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num_filters=num_filters,
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filter_size=1,
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act='relu',
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name=name + "_branch2a")
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conv1 = self.conv_bn_layer(
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input=conv0,
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num_filters=num_filters,
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filter_size=3,
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stride=stride,
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act='relu',
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name=name + "_branch2b")
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conv2 = self.conv_bn_layer(
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input=conv1,
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num_filters=num_filters * 4,
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filter_size=1,
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act=None,
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name=name + "_branch2c")
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short = self.shortcut(
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input,
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num_filters * 4,
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stride,
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if_first=if_first,
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name=name + "_branch1")
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return fluid.layers.elementwise_add(x=short, y=conv2, act='relu')
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def basic_block(self, input, num_filters, stride, name, if_first):
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conv0 = self.conv_bn_layer(
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input=input,
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num_filters=num_filters,
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filter_size=3,
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act='relu',
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stride=stride,
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name=name + "_branch2a")
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conv1 = self.conv_bn_layer(
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input=conv0,
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num_filters=num_filters,
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filter_size=3,
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act=None,
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name=name + "_branch2b")
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short = self.shortcut(
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input,
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num_filters,
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stride,
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if_first=if_first,
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name=name + "_branch1")
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return fluid.layers.elementwise_add(x=short, y=conv1, act='relu')
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