#   Copyright (c) 2019 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 paddle.fluid.core as core
import unittest

import numpy as np
import paddle
import paddle.fluid as fluid
from simple_nets import init_data
from parallel_executor_test_base import TestParallelExecutorBase, DeviceType

batch_size = 12
img_shape = [1, 28, 28]


def loss_net(hidden, label):
    prediction = fluid.layers.fc(input=hidden, size=10, act='softmax')
    loss = fluid.layers.cross_entropy(input=prediction, label=label)
    avg_loss = paddle.mean(loss)
    return avg_loss


def conv_net(use_feed):
    img = fluid.layers.data(name='image', shape=img_shape, dtype='float16')
    label = fluid.layers.data(name='label', shape=[1], dtype='int64')

    conv_pool_1 = fluid.nets.simple_img_conv_pool(input=img,
                                                  filter_size=5,
                                                  num_filters=20,
                                                  pool_size=2,
                                                  pool_stride=2,
                                                  act="relu")
    conv_pool_1 = fluid.layers.batch_norm(conv_pool_1)

    conv_pool_1 = fluid.layers.cast(conv_pool_1, np.float32)
    conv_pool_2 = fluid.nets.simple_img_conv_pool(input=conv_pool_1,
                                                  filter_size=5,
                                                  num_filters=50,
                                                  pool_size=2,
                                                  pool_stride=2,
                                                  act="relu")
    hidden = fluid.layers.cast(conv_pool_2, np.float32)
    return loss_net(hidden, label)


def _optimizer(learning_rate=1e-6):
    optimizer = fluid.optimizer.SGD(learning_rate=learning_rate)
    return optimizer


class TestResnet(TestParallelExecutorBase):

    def check_model(self, use_device):
        img, label = init_data(batch_size=batch_size,
                               img_shape=img_shape,
                               label_range=9)
        img = np.float16(img)
        feed_dict = {"image": img, "label": label}

        TestParallelExecutorBase.check_network_convergence(
            conv_net,
            feed_dict=feed_dict,
            iter=10,
            use_device=use_device,
            fuse_all_reduce_ops=True,
            optimizer=_optimizer)

    def test_model(self):
        if core.is_compiled_with_cuda():
            self.check_model(DeviceType.CUDA)


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