# Copyright (c) 2018 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. import contextlib import unittest import numpy as np import six import paddle import paddle.fluid as fluid from paddle.fluid import core from paddle.fluid.optimizer import SGDOptimizer from paddle.fluid.imperative.nn import Conv2D, Pool2D, BatchNorm, FC from paddle.fluid.imperative.base import to_variable from test_imperative_base import new_program_scope train_parameters = { "input_size": [3, 224, 224], "input_mean": [0.485, 0.456, 0.406], "input_std": [0.229, 0.224, 0.225], "learning_strategy": { "name": "piecewise_decay", "batch_size": 256, "epochs": [30, 60, 90], "steps": [0.1, 0.01, 0.001, 0.0001] } } def optimizer_setting(params): ls = params["learning_strategy"] if ls["name"] == "piecewise_decay": if "total_images" not in params: total_images = 1281167 else: total_images = params["total_images"] batch_size = ls["batch_size"] step = int(total_images / batch_size + 1) bd = [step * e for e in ls["epochs"]] base_lr = params["lr"] lr = [] lr = [base_lr * (0.1**i) for i in range(len(bd) + 1)] optimizer = fluid.optimizer.Momentum( learning_rate=fluid.layers.piecewise_decay( boundaries=bd, values=lr), momentum=0.9, regularization=fluid.regularizer.L2Decay(1e-4)) return optimizer class ConvBNLayer(fluid.imperative.Layer): def __init__(self, num_filters, filter_size, stride=1, groups=1, act=None): super(ConvBNLayer, self).__init__() self._conv = Conv2D( 3, num_filters, filter_size, stride, (filter_size - 1) // 2, groups=groups, act=None, bias_attr=None) self._batch_norm = BatchNorm(num_filters, act=act) def forward(self, inputs): y = self._conv(inputs) y = self._batch_norm(y) return y class BottleneckBlock(fluid.imperative.Layer): def __init__(self, num_filters, stride, shortcut=False): super(BottleneckBlock, self).__init__() self.conv0 = ConvBNLayer( num_filters=num_filters, filter_size=1, act='relu') self.conv1 = ConvBNLayer( num_filters=num_filters, filter_size=3, stride=stride, act='relu') self.conv2 = ConvBNLayer( num_filters=num_filters * 4, filter_size=1, act=None) if shortcut: self.short = ConvBNLayer( num_filters=num_filters * 4, filter_size=1, stride=stride) self.shortcut = shortcut def forward(self, inputs): self.conv0() self.conv1() self.conv2() if self.shortcut: self.short() return fluid.layers.elementwise_add( x=self.short, y=self.conv2, act='relu') class ResNet(fluid.imperative.Layer): def __init__(self, layers=50, class_dim=1000): self.layers = layers supported_layers = [50, 101, 152] assert layers in supported_layers, \ "supported layers are {} but input layer is {}".format(supported_layers, layers) if layers == 50: depth = [3, 4, 6, 3] elif layers == 101: depth = [3, 4, 23, 3] elif layers == 152: depth = [3, 8, 36, 3] num_filters = [64, 128, 256, 512] self.conv = ConvBNLayer( num_filters=64, filter_size=7, stride=2, act='relu') self.pool2d_max = Pool2D( pool_size=3, pool_stride=2, pool_padding=1, pool_type='max') self.bottleneck_block_list = [] for block in range(len(depth)): shortcut = True for i in range(depth[block]): bottleneck_block = BottleneckBlock( num_filters=num_filters[block], stride=2 if i == 0 and block != 0 else 1, shortcut=shortcut) self.bottleneck_block_list.append(bottleneck_block) shortcut = False self.pool2d_avg = Pool2D( pool_size=7, pool_type='avg', global_pooling=True) import math stdv = 1.0 / math.sqrt(2048 * 1.0) self.out = FC(size=class_dim, act='softmax', param_attr=fluid.param_attr.ParamAttr( initializer=fluid.initializer.Uniform(-stdv, stdv))) def forward(self, inputs): y = self.conv(inputs) y = self.pool2d_max(y) for bottleneck_block in self.bottleneck_block_list: y = bottleneck_block(y) y = self.pool2d_avg(y) y = self.out() return y class TestImperativeResnet(unittest.TestCase): def test_resnet_cpu_float32(self): seed = 90 with fluid.imperative.guard(): fluid.default_startup_program().random_seed = seed fluid.default_main_program().random_seed = seed resnet = ResNet() optimizer = optimizer_setting(train_parameters) train_reader = paddle.batch( paddle.dataset.flowers.train(), batch_size=256) dy_param_init_value = {} for batch_id, data in enumerate(train_reader()): if batch_id >= 2: break x_data = np.array( [x[0].reshape(1, 28, 28) for x in data]).astype('float32') y_data = np.array([x[1] for x in data]).astype('int64').reshape( 128, 1) img = to_variable(x_data) label = to_variable(y_data) label._stop_gradient = True cost = resnet(img) loss = fluid.layers.cross_entropy(input=out, label=label) avg_loss = fluid.layers.mean(x=cost) dy_out = avg_loss._numpy() if batch_id == 0: for param in fluid.default_main_program().global_block( ).all_parameters(): dy_param_init_value[param.name] = param._numpy() avg_loss._backward() optimizer.minimize(avg_loss) dy_param_value = {} for param in fluid.default_main_program().global_block( ).all_parameters(): dy_param_value[param.name] = param._numpy() # with new_program_scope(): # fluid.default_startup_program().random_seed = seed # fluid.default_main_program().random_seed = seed # exe = fluid.Executor(fluid.CPUPlace()) # # mnist = Conv2D(1, 20, 5) # mnist = MNIST() # sgd = SGDOptimizer(learning_rate=1e-3) # train_reader = paddle.batch( # paddle.dataset.mnist.train(), batch_size=128) # img = fluid.layers.data( # name='pixel', shape=[1, 28, 28], dtype='float32') # label = fluid.layers.data(name='label', shape=[1], dtype='int64') # cost = mnist(img) # loss = fluid.layers.reduce_mean(cost) # sgd.minimize(loss) # # initialize params and fetch them # static_param_init_value = {} # static_param_name_list = [] # for param in fluid.default_startup_program().global_block( # ).all_parameters(): # static_param_name_list.append(param.name) # out = exe.run(fluid.default_startup_program(), # fetch_list=static_param_name_list) # for i in range(len(static_param_name_list)): # static_param_init_value[static_param_name_list[i]] = out[i] # for batch_id, data in enumerate(train_reader()): # if batch_id >= 2: # break # x_data = np.array( # [x[0].reshape(1, 28, 28) for x in data]).astype('float32') # y_data = np.array([x[1] for x in data]).astype('int64').reshape( # [128, 1]) # fetch_list = [loss.name] # fetch_list.extend(static_param_name_list) # out = exe.run(fluid.default_main_program(), # feed={"pixel": x_data, # "label": y_data}, # fetch_list=fetch_list) # static_param_value = {} # static_out = out[0] # for i in range(1, len(out)): # static_param_value[static_param_name_list[i - 1]] = out[i] # for key, value in six.iteritems(static_param_init_value): # self.assertTrue( # np.allclose(value.all(), dy_param_init_value[key].all())) # self.assertTrue(np.allclose(static_out.all(), dy_out.all())) # for key, value in six.iteritems(static_param_value): # self.assertTrue(np.allclose(value.all(), dy_param_value[key].all())) if __name__ == '__main__': unittest.main()