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314 lines
9.9 KiB
314 lines
9.9 KiB
# Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
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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 print_function
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import os
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import contextlib
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import unittest
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import numpy as np
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import six
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import pickle
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import sys
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import paddle
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import paddle.fluid as fluid
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import paddle.fluid.dygraph as dygraph
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from paddle.fluid import core
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from paddle.fluid.optimizer import SGDOptimizer
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from paddle.fluid.dygraph.nn import Conv2D, Pool2D, FC, BatchNorm
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from paddle.fluid.dygraph.base import to_variable
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from paddle.fluid.layer_helper import LayerHelper
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from test_dist_base import runtime_main, TestParallelDyGraphRunnerBase
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class ConvBNLayer(fluid.dygraph.Layer):
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def __init__(self,
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name_scope,
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num_channels,
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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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super(ConvBNLayer, self).__init__(name_scope)
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self._conv = Conv2D(
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self.full_name(),
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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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bias_attr=None)
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self._batch_norm = BatchNorm(
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self.full_name(), num_filters, act=act, momentum=0.1)
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def forward(self, inputs):
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y = self._conv(inputs)
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y = self._batch_norm(y)
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return y
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class SqueezeExcitation(fluid.dygraph.Layer):
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def __init__(self, name_scope, num_channels, reduction_ratio):
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super(SqueezeExcitation, self).__init__(name_scope)
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self._pool = Pool2D(
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self.full_name(), pool_size=0, pool_type='avg', global_pooling=True)
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self._squeeze = FC(
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self.full_name(),
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size=num_channels // reduction_ratio,
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param_attr=fluid.ParamAttr(
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initializer=fluid.initializer.Constant(value=0.05)),
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act='relu')
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self._excitation = FC(
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self.full_name(),
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size=num_channels,
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param_attr=fluid.ParamAttr(
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initializer=fluid.initializer.Constant(value=0.05)),
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act='sigmoid')
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def forward(self, input):
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y = self._pool(input)
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y = self._squeeze(y)
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y = self._excitation(y)
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y = fluid.layers.elementwise_mul(x=input, y=y, axis=0)
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return y
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class BottleneckBlock(fluid.dygraph.Layer):
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def __init__(self,
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name_scope,
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num_channels,
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num_filters,
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stride,
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cardinality,
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reduction_ratio,
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shortcut=True):
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super(BottleneckBlock, self).__init__(name_scope)
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self.conv0 = ConvBNLayer(
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self.full_name(),
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num_channels=num_channels,
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num_filters=num_filters,
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filter_size=1)
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self.conv1 = ConvBNLayer(
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self.full_name(),
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num_channels=num_filters,
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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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groups=cardinality)
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self.conv2 = ConvBNLayer(
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self.full_name(),
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num_channels=num_filters,
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num_filters=num_filters * 4,
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filter_size=1,
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act='relu')
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self.scale = SqueezeExcitation(
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self.full_name(),
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num_channels=num_filters * 4,
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reduction_ratio=reduction_ratio)
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if not shortcut:
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self.short = ConvBNLayer(
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self.full_name(),
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num_channels=num_channels,
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num_filters=num_filters * 4,
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filter_size=1,
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stride=stride)
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self.shortcut = shortcut
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self._num_channels_out = num_filters * 4
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def forward(self, inputs):
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y = self.conv0(inputs)
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conv1 = self.conv1(y)
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conv2 = self.conv2(conv1)
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scale = self.scale(conv2)
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if self.shortcut:
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short = inputs
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else:
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short = self.short(inputs)
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y = fluid.layers.elementwise_add(x=short, y=scale)
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layer_helper = LayerHelper(self.full_name(), act='relu')
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y = layer_helper.append_activation(y)
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return y
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class SeResNeXt(fluid.dygraph.Layer):
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def __init__(self, name_scope, layers=50, class_dim=102):
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super(SeResNeXt, self).__init__(name_scope)
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self.layers = layers
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supported_layers = [50, 101, 152]
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assert layers in supported_layers, \
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"supported layers are {} but input layer is {}".format(supported_layers, layers)
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if layers == 50:
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cardinality = 32
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reduction_ratio = 16
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depth = [3, 4, 6, 3]
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num_filters = [128, 256, 512, 1024]
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self.conv0 = ConvBNLayer(
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self.full_name(),
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num_channels=3,
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num_filters=64,
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filter_size=7,
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stride=2,
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act='relu')
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self.pool = Pool2D(
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self.full_name(),
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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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elif layers == 101:
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cardinality = 32
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reduction_ratio = 16
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depth = [3, 4, 23, 3]
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num_filters = [128, 256, 512, 1024]
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self.conv0 = ConvBNLayer(
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self.full_name(),
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num_channels=3,
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num_filters=3,
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filter_size=7,
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stride=2,
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act='relu')
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self.pool = Pool2D(
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self.full_name(),
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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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elif layers == 152:
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cardinality = 64
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reduction_ratio = 16
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depth = [3, 8, 36, 3]
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num_filters = [128, 256, 512, 1024]
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self.conv0 = ConvBNLayer(
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self.full_name(),
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num_channels=3,
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num_filters=3,
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filter_size=7,
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stride=2,
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act='relu')
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self.conv1 = ConvBNLayer(
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self.full_name(),
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num_channels=64,
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num_filters=3,
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filter_size=7,
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stride=2,
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act='relu')
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self.conv2 = ConvBNLayer(
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self.full_name(),
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num_channels=64,
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num_filters=3,
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filter_size=7,
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stride=2,
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act='relu')
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self.pool = Pool2D(
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self.full_name(),
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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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self.bottleneck_block_list = []
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num_channels = 64
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for block in range(len(depth)):
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shortcut = False
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for i in range(depth[block]):
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bottleneck_block = self.add_sublayer(
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'bb_%d_%d' % (block, i),
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BottleneckBlock(
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self.full_name(),
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num_channels=num_channels,
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num_filters=num_filters[block],
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stride=2 if i == 0 and block != 0 else 1,
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cardinality=cardinality,
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reduction_ratio=reduction_ratio,
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shortcut=shortcut))
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num_channels = bottleneck_block._num_channels_out
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self.bottleneck_block_list.append(bottleneck_block)
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shortcut = True
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self.pool2d_avg = Pool2D(
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self.full_name(), pool_size=7, pool_type='avg', global_pooling=True)
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import math
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stdv = 1.0 / math.sqrt(2048 * 1.0)
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self.fc = FC(self.full_name(),
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size=class_dim,
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act='softmax',
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param_attr=fluid.param_attr.ParamAttr(
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initializer=fluid.initializer.Uniform(-stdv, stdv)))
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def forward(self, inputs, label):
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if self.layers == 50 or self.layers == 101:
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y = self.conv0(inputs)
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y = self.pool(y)
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elif self.layers == 152:
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y = self.conv0(inputs)
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y = self.conv1(inputs)
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y = self.conv2(inputs)
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y = self.pool(y)
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for bottleneck_block in self.bottleneck_block_list:
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y = bottleneck_block(y)
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y = self.pool2d_avg(y)
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y = fluid.layers.dropout(y, dropout_prob=0.2, seed=1)
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cost = self.fc(y)
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loss = fluid.layers.cross_entropy(cost, label)
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avg_loss = fluid.layers.mean(loss)
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return avg_loss
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class TestSeResNeXt(TestParallelDyGraphRunnerBase):
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def get_model(self):
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model = SeResNeXt("se-resnext")
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train_reader = paddle.batch(
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paddle.dataset.flowers.test(use_xmap=False),
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batch_size=2,
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drop_last=True)
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opt = fluid.optimizer.SGD(learning_rate=1e-3)
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return model, train_reader, opt
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def run_one_loop(self, model, opt, data):
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bs = len(data)
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dy_x_data = np.array([x[0].reshape(3, 224, 224)
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for x in data]).astype('float32')
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y_data = np.array([x[1] for x in data]).astype('int64').reshape(bs, 1)
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img = to_variable(dy_x_data)
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label = to_variable(y_data)
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label.stop_gradient = True
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loss = model(img, label)
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return loss
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if __name__ == "__main__":
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runtime_main(TestSeResNeXt)
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