# 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. from __future__ import print_function import argparse import ast import time import numpy as np from PIL import Image import os import paddle import paddle.fluid as fluid from paddle.fluid.optimizer import AdamOptimizer from paddle.fluid.dygraph.nn import Conv2D, Pool2D, Linear from paddle.fluid.dygraph.base import to_variable def parse_args(): parser = argparse.ArgumentParser("Training for Mnist.") parser.add_argument( "--use_data_parallel", type=ast.literal_eval, default=False, help="The flag indicating whether to use data parallel mode to train the model." ) parser.add_argument("-e", "--epoch", default=1, type=int, help="set epoch") parser.add_argument("--ce", action="store_true", help="run ce") args = parser.parse_args() return args class SimpleImgConvPool(fluid.dygraph.Layer): def __init__(self, num_channels, num_filters, filter_size, pool_size, pool_stride, pool_padding=0, pool_type='max', global_pooling=False, conv_stride=1, conv_padding=0, conv_dilation=1, conv_groups=1, act=None, use_cudnn=False, param_attr=None, bias_attr=None): super(SimpleImgConvPool, self).__init__() self._conv2d = Conv2D( num_channels=num_channels, num_filters=num_filters, filter_size=filter_size, stride=conv_stride, padding=conv_padding, dilation=conv_dilation, groups=conv_groups, param_attr=None, bias_attr=None, act=act, use_cudnn=use_cudnn) self._pool2d = Pool2D( pool_size=pool_size, pool_type=pool_type, pool_stride=pool_stride, pool_padding=pool_padding, global_pooling=global_pooling, use_cudnn=use_cudnn) def forward(self, inputs): x = self._conv2d(inputs) x = self._pool2d(x) return x class MNIST(fluid.dygraph.Layer): def __init__(self): super(MNIST, self).__init__() self._simple_img_conv_pool_1 = SimpleImgConvPool( 1, 20, 5, 2, 2, act="relu") self._simple_img_conv_pool_2 = SimpleImgConvPool( 20, 50, 5, 2, 2, act="relu") self.pool_2_shape = 50 * 4 * 4 SIZE = 10 scale = (2.0 / (self.pool_2_shape**2 * SIZE))**0.5 self._fc = Linear(self.pool_2_shape, 10, param_attr=fluid.param_attr.ParamAttr( initializer=fluid.initializer.NormalInitializer( loc=0.0, scale=scale)), act="softmax") def forward(self, inputs, label=None): x = self._simple_img_conv_pool_1(inputs) x = self._simple_img_conv_pool_2(x) x = fluid.layers.reshape(x, shape=[-1, self.pool_2_shape]) x = self._fc(x) if label is not None: acc = fluid.layers.accuracy(input=x, label=label) return x, acc else: return x def reader_decorator(reader): def __reader__(): for item in reader(): img = np.array(item[0]).astype('float32').reshape(1, 28, 28) label = np.array(item[1]).astype('int64').reshape(1) yield img, label return __reader__ def test_mnist(reader, model, batch_size): acc_set = [] avg_loss_set = [] for batch_id, data in enumerate(reader()): img, label = data label.stop_gradient = True prediction, acc = model(img, label) loss = fluid.layers.cross_entropy(input=prediction, label=label) avg_loss = fluid.layers.mean(loss) acc_set.append(float(acc.numpy())) avg_loss_set.append(float(avg_loss.numpy())) # get test acc and loss acc_val_mean = np.array(acc_set).mean() avg_loss_val_mean = np.array(avg_loss_set).mean() return avg_loss_val_mean, acc_val_mean def inference_mnist(): place = fluid.CUDAPlace(fluid.dygraph.parallel.Env().dev_id) \ if args.use_data_parallel else fluid.CUDAPlace(0) with fluid.dygraph.guard(place): mnist_infer = MNIST() # load checkpoint model_dict, _ = fluid.load_dygraph("save_temp") mnist_infer.set_dict(model_dict) print("checkpoint loaded") # start evaluate mode mnist_infer.eval() def load_image(file): im = Image.open(file).convert('L') im = im.resize((28, 28), Image.ANTIALIAS) im = np.array(im).reshape(1, 1, 28, 28).astype(np.float32) im = im / 255.0 * 2.0 - 1.0 return im cur_dir = os.path.dirname(os.path.realpath(__file__)) tensor_img = load_image(cur_dir + '/image/infer_3.png') results = mnist_infer(to_variable(tensor_img)) lab = np.argsort(results.numpy()) print("Inference result of image/infer_3.png is: %d" % lab[0][-1]) def train_mnist(args): epoch_num = args.epoch BATCH_SIZE = 64 place = fluid.CUDAPlace(fluid.dygraph.parallel.Env().dev_id) \ if args.use_data_parallel else fluid.CUDAPlace(0) with fluid.dygraph.guard(place): if args.ce: print("ce mode") seed = 33 np.random.seed(seed) fluid.default_startup_program().random_seed = seed fluid.default_main_program().random_seed = seed if args.use_data_parallel: strategy = fluid.dygraph.parallel.prepare_context() mnist = MNIST() adam = AdamOptimizer(learning_rate=0.001, parameter_list=mnist.parameters()) if args.use_data_parallel: mnist = fluid.dygraph.parallel.DataParallel(mnist, strategy) train_reader = paddle.batch( reader_decorator( paddle.dataset.mnist.train()), batch_size=BATCH_SIZE, drop_last=True) if args.use_data_parallel: train_reader = fluid.contrib.reader.distributed_batch_reader( train_reader) test_reader = paddle.batch( reader_decorator( paddle.dataset.mnist.test()), batch_size=BATCH_SIZE, drop_last=True) train_loader = fluid.io.DataLoader.from_generator(capacity=10, use_multiprocess=True) train_loader.set_sample_list_generator(train_reader, places=place) test_loader = fluid.io.DataLoader.from_generator(capacity=10, use_multiprocess=True) test_loader.set_sample_list_generator(test_reader, places=place) total_train_time = 0 for epoch in range(epoch_num): stime = time.time() for batch_id, data in enumerate(train_loader()): img, label = data label.stop_gradient = True cost, acc = mnist(img, label) loss = fluid.layers.cross_entropy(cost, label) avg_loss = fluid.layers.mean(loss) if args.use_data_parallel: avg_loss = mnist.scale_loss(avg_loss) avg_loss.backward() mnist.apply_collective_grads() else: avg_loss.backward() adam.minimize(avg_loss) # save checkpoint mnist.clear_gradients() if batch_id % 100 == 0: print("Loss at epoch {} step {}: {:}".format( epoch, batch_id, avg_loss.numpy())) total_train_time += (time.time() - stime) mnist.eval() test_cost, test_acc = test_mnist(test_loader, mnist, BATCH_SIZE) mnist.train() if args.ce: print("kpis\ttest_acc\t%s" % test_acc) print("kpis\ttest_cost\t%s" % test_cost) print("Loss at epoch {} , Test avg_loss is: {}, acc is: {}".format( epoch, test_cost, test_acc)) save_parameters = (not args.use_data_parallel) or ( args.use_data_parallel and fluid.dygraph.parallel.Env().local_rank == 0) if save_parameters: fluid.save_dygraph(mnist.state_dict(), "save_temp") print("checkpoint saved") inference_mnist() print("total train time: {} s".format(total_train_time)) if __name__ == '__main__': args = parse_args() train_mnist(args)