test_multiprocess_dataloader_static.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.

import os
import sys
import six
import time
import unittest
import multiprocessing
import numpy as np

import paddle
import paddle.fluid as fluid
from paddle.io import Dataset, BatchSampler, DataLoader

EPOCH_NUM = 3
BATCH_SIZE = 8
IMAGE_SIZE = 32
SAMPLE_NUM = 100
CLASS_NUM = 10


class RandomDataset(Dataset):

    def __init__(self, sample_num, class_num):
        self.sample_num = sample_num
        self.class_num = class_num

    def __getitem__(self, idx):
        np.random.seed(idx)
        image = np.random.random([IMAGE_SIZE]).astype('float32')
        label = np.random.randint(0, self.class_num - 1, (1, )).astype('int64')
        return image, label

    def __len__(self):
        return self.sample_num


def simple_fc_net_static():
    startup_prog = fluid.Program()
    main_prog = fluid.Program()
    startup_prog.random_seed = 1
    main_prog.random_seed = 1

    with fluid.unique_name.guard():
        with fluid.program_guard(main_prog, startup_prog):
            image = fluid.data(name='image',
                               shape=[None, IMAGE_SIZE],
                               dtype='float32')
            label = fluid.data(name='label', shape=[None, 1], dtype='int64')
            hidden = image
            param_attr = fluid.ParamAttr(initializer=fluid.initializer.Constant(
                value=0.8))
            bias_attr = fluid.ParamAttr(initializer=fluid.initializer.Constant(
                value=0.5))
            for hidden_size in [10, 20, 30]:
                hidden = fluid.layers.fc(hidden,
                                         size=hidden_size,
                                         act='tanh',
                                         param_attr=param_attr,
                                         bias_attr=bias_attr)

            predict_label = fluid.layers.fc(hidden,
                                            size=CLASS_NUM,
                                            act='softmax',
                                            param_attr=param_attr,
                                            bias_attr=bias_attr)
            loss = fluid.layers.reduce_mean(
                fluid.layers.cross_entropy(input=predict_label, label=label))

            optimizer = fluid.optimizer.Adam()
            optimizer.minimize(loss)
    return startup_prog, main_prog, image, label, loss


def prepare_places(with_data_parallel, with_cpu=False, with_gpu=True):
    places = []
    if with_cpu:
        places.append([fluid.CPUPlace()])
        if with_data_parallel:
            places.append([fluid.CPUPlace()] * 2)

    if with_gpu and fluid.core.is_compiled_with_cuda():
        tmp = fluid.cuda_places()[:2]
        assert len(tmp) > 0, "no gpu detected"
        if with_data_parallel and len(tmp) > 1:
            places.append(tmp)
        places.append([tmp[0]])
    return places


class TestStaticDataLoader(unittest.TestCase):

    def run_main(self, num_workers, places, persistent_workers, use_pe=True):
        scope = fluid.Scope()
        with fluid.scope_guard(scope):
            startup_prog, main_prog, image, label, loss = simple_fc_net_static()

            dataset = RandomDataset(SAMPLE_NUM, CLASS_NUM)
            dataloader = DataLoader(dataset,
                                    feed_list=[image, label],
                                    places=places,
                                    num_workers=num_workers,
                                    batch_size=BATCH_SIZE,
                                    return_list=False,
                                    drop_last=True,
                                    persistent_workers=persistent_workers)
            assert len(dataloader) == int(SAMPLE_NUM / BATCH_SIZE)

            exe = fluid.Executor(place=places[0])
            exe.run(startup_prog)

            if use_pe:
                prog = fluid.CompiledProgram(main_prog)
                if len(places) > 1:
                    prog = prog.with_data_parallel(loss_name=loss.name,
                                                   places=places)
            else:
                prog = main_prog

            step_list = []
            loss_list = []
            start_t = time.time()
            for _ in six.moves.range(EPOCH_NUM):
                step = 0
                for d in dataloader:
                    assert len(d) == len(places), "{} != {}".format(
                        len(d), len(places))
                    for i, item in enumerate(d):
                        image = item['image']
                        label = item['label']
                        assert image.shape() == [BATCH_SIZE, IMAGE_SIZE]
                        assert label.shape() == [BATCH_SIZE, 1]
                        assert image._place()._equals(places[i])
                        assert label._place()._equals(places[i])
                    L, = exe.run(program=prog,
                                 feed=d,
                                 fetch_list=[loss],
                                 use_program_cache=True)
                    loss_list.append(np.mean(L))
                    step += 1
                step_list.append(step)

        end_t = time.time()
        ret = {
            "time": end_t - start_t,
            "step": step_list,
            "loss": np.array(loss_list)
        }
        print("time cost", ret['time'], 'step_list', ret['step'])
        return ret

    def test_main(self):
        for p in prepare_places(True):
            for persistent_workers in [True, False]:
                results = []
                for num_workers in [0, 2]:
                    print(self.__class__.__name__, p, num_workers,
                          persistent_workers)
                    sys.stdout.flush()
                    ret = self.run_main(num_workers=num_workers,
                                        places=p,
                                        persistent_workers=persistent_workers)
                    results.append(ret)
                diff = np.max(
                    np.abs(results[0]['loss'] - results[1]['loss']) /
                    np.abs(results[0]['loss']))
                self.assertLess(diff, 1e-2)


class TestStaticDataLoaderReturnList(unittest.TestCase):

    def run_single_place(self, num_workers):
        scope = fluid.Scope()
        image = fluid.data(name='image',
                           shape=[None, IMAGE_SIZE],
                           dtype='float32')
        label = fluid.data(name='label', shape=[None, 1], dtype='int64')
        with fluid.scope_guard(scope):
            dataset = RandomDataset(SAMPLE_NUM, CLASS_NUM)
            dataloader = DataLoader(dataset,
                                    feed_list=[image, label],
                                    num_workers=num_workers,
                                    batch_size=BATCH_SIZE,
                                    drop_last=True,
                                    return_list=True)

            for d in dataloader:
                assert isinstance(d, list)
                assert len(d) == 2
                assert not isinstance(d[0], list)
                assert not isinstance(d[1], list)

    def run_multi_place(self, num_workers):
        scope = fluid.Scope()
        image = fluid.data(name='image',
                           shape=[None, IMAGE_SIZE],
                           dtype='float32')
        label = fluid.data(name='label', shape=[None, 1], dtype='int64')
        with fluid.scope_guard(scope):
            dataset = RandomDataset(SAMPLE_NUM, CLASS_NUM)
            dataloader = DataLoader(dataset,
                                    feed_list=[image, label],
                                    num_workers=num_workers,
                                    batch_size=BATCH_SIZE,
                                    places=[fluid.CPUPlace()] * 2,
                                    drop_last=True,
                                    return_list=True)

            for d in dataloader:
                assert isinstance(d, list)
                assert len(d) == 2
                assert isinstance(d[0], list)
                assert isinstance(d[1], list)

    def test_main(self):
        paddle.enable_static()
        for num_workers in [0, 2]:
            self.run_single_place(num_workers)
            self.run_multi_place(num_workers)


class RandomBatchedDataset(Dataset):

    def __init__(self, sample_num, class_num):
        self.sample_num = int(sample_num / BATCH_SIZE)
        self.class_num = class_num

    def __getitem__(self, idx):
        np.random.seed(idx)
        images = []
        labels = []
        for _ in range(BATCH_SIZE):
            image = np.random.random([IMAGE_SIZE]).astype('float32')
            label = np.random.randint(0, self.class_num - 1,
                                      (1, )).astype('int64')
            images.append(image)
            labels.append(label)
        return np.stack(images, axis=0), np.stack(labels, axis=0)

    def __len__(self):
        return self.sample_num


class TestStaticDataLoaderWithBatchedDataset(TestStaticDataLoader):

    def run_main(self, num_workers, places, persistent_workers):
        scope = fluid.Scope()
        with fluid.scope_guard(scope):
            startup_prog, main_prog, image, label, loss = simple_fc_net_static()

            dataset = RandomBatchedDataset(SAMPLE_NUM, CLASS_NUM)
            dataloader = DataLoader(dataset,
                                    feed_list=[image, label],
                                    places=places,
                                    num_workers=num_workers,
                                    batch_size=None,
                                    return_list=False,
                                    drop_last=True,
                                    persistent_workers=persistent_workers)
            assert len(dataloader) == int(SAMPLE_NUM / BATCH_SIZE)

            exe = fluid.Executor(place=places[0])
            exe.run(startup_prog)

            prog = fluid.CompiledProgram(main_prog)
            if len(places) > 1:
                prog = prog.with_data_parallel(loss_name=loss.name,
                                               places=places)

            step_list = []
            loss_list = []
            start_t = time.time()
            for _ in six.moves.range(EPOCH_NUM):
                step = 0
                for d in dataloader:
                    assert len(d) == len(places), "{} != {}".format(
                        len(d), len(places))
                    for i, item in enumerate(d):
                        image = item['image']
                        label = item['label']
                        assert image.shape() == [BATCH_SIZE, IMAGE_SIZE]
                        assert label.shape() == [BATCH_SIZE, 1]
                        assert image._place()._equals(places[i])
                        assert label._place()._equals(places[i])
                    L, = exe.run(program=prog,
                                 feed=d,
                                 fetch_list=[loss],
                                 use_program_cache=True)
                    loss_list.append(np.mean(L))
                    step += 1
                step_list.append(step)

        end_t = time.time()
        ret = {
            "time": end_t - start_t,
            "step": step_list,
            "loss": np.array(loss_list)
        }
        print("time cost", ret['time'], 'step_list', ret['step'])
        return ret


if __name__ == '__main__':
    unittest.main()