#   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.

from __future__ import print_function

import unittest
import numpy as np

import paddle
import paddle.fluid as fluid
import paddle.fluid.layers as layers
import paddle.fluid.core as core
import gradient_checker

from decorator_helper import prog_scope


class TestConvTransposeDoubleGradCheck(unittest.TestCase):

    def conv_transpose_wrapper(self, x):
        return paddle.nn.functional.conv2d_transpose(x[0], x[1], groups=1)

    @prog_scope()
    def func(self, place):
        shape = [2, 4, 3, 3]
        eps = 0.005
        dtype = np.float64
        if core.is_compiled_with_rocm():
            dtype = np.float32
        x = layers.data('x', shape, False, dtype)
        y = layers.conv2d_transpose(x,
                                    2,
                                    filter_size=1,
                                    groups=1,
                                    bias_attr=False)
        x_arr = np.random.uniform(-1, 1, shape).astype(dtype)

        w = fluid.default_main_program().global_block().all_parameters()
        w_arr = []
        for p in w:
            w_arr.append(np.random.uniform(-1, 1, p.shape).astype(dtype))
        if core.is_compiled_with_rocm():
            # HIP will sometimes fail if no atol
            gradient_checker.double_grad_check([x] + w,
                                               y,
                                               x_init=[x_arr] + w_arr,
                                               place=place,
                                               eps=eps,
                                               atol=1e-4)
        else:
            gradient_checker.double_grad_check([x] + w,
                                               y,
                                               x_init=[x_arr] + w_arr,
                                               place=place,
                                               eps=eps)
        gradient_checker.double_grad_check_for_dygraph(
            self.conv_transpose_wrapper, [x] + w,
            y,
            x_init=[x_arr] + w_arr,
            place=place)

    def test_grad(self):
        places = []

        if core.is_compiled_with_cuda():
            places.append(fluid.CUDAPlace(0))
        for p in places:
            self.func(p)


class TestConvTranspose2DoubleGradCheck_AsyPadding(
        TestConvTransposeDoubleGradCheck):

    def conv_transpose_wrapper(self, x):
        return paddle.nn.functional.conv2d_transpose(x[0],
                                                     x[1],
                                                     groups=1,
                                                     padding=[1, 0, 0, 1])

    @prog_scope()
    def func(self, place):
        shape = [2, 2, 3, 3]
        eps = 0.005
        dtype = np.float64
        if core.is_compiled_with_rocm():
            dtype = np.float32
        x = layers.data('x', shape, False, dtype)
        y = layers.conv2d_transpose(input=x,
                                    num_filters=2,
                                    filter_size=1,
                                    padding=[1, 0, 0, 1],
                                    bias_attr=False,
                                    use_cudnn=True)
        x_arr = np.random.uniform(-1, 1, shape).astype(dtype)

        w = fluid.default_main_program().global_block().all_parameters()
        w_arr = []
        for p in w:
            w_arr.append(np.random.uniform(-1, 1, p.shape).astype(dtype))
        if core.is_compiled_with_rocm():
            # HIP will sometimes fail if no atol
            gradient_checker.double_grad_check([x] + w,
                                               y,
                                               x_init=[x_arr] + w_arr,
                                               place=place,
                                               eps=eps,
                                               atol=1e-4)
        else:
            gradient_checker.double_grad_check([x] + w,
                                               y,
                                               x_init=[x_arr] + w_arr,
                                               place=place,
                                               eps=eps)
        gradient_checker.double_grad_check_for_dygraph(
            self.conv_transpose_wrapper, [x] + w,
            y,
            x_init=[x_arr] + w_arr,
            place=place)


class TestConvTranspose2DoubleGradCheck_PaddingSAME(
        TestConvTransposeDoubleGradCheck):

    def conv_transpose_wrapper(self, x):
        return paddle.nn.functional.conv2d_transpose(x[0],
                                                     x[1],
                                                     groups=1,
                                                     padding="SAME")

    @prog_scope()
    def func(self, place):
        shape = [2, 2, 3, 3]
        eps = 0.005
        dtype = np.float64
        if core.is_compiled_with_rocm():
            dtype = np.float32
        x = layers.data('x', shape, False, dtype)
        y = layers.conv2d_transpose(input=x,
                                    num_filters=2,
                                    filter_size=1,
                                    padding="SAME",
                                    bias_attr=False,
                                    use_cudnn=True)
        x_arr = np.random.uniform(-1, 1, shape).astype(dtype)

        w = fluid.default_main_program().global_block().all_parameters()
        w_arr = []
        for p in w:
            w_arr.append(np.random.uniform(-1, 1, p.shape).astype(dtype))
        if core.is_compiled_with_rocm():
            # HIP will sometimes fail if no atol
            gradient_checker.double_grad_check([x] + w,
                                               y,
                                               x_init=[x_arr] + w_arr,
                                               place=place,
                                               eps=eps,
                                               atol=1e-4)
        else:
            gradient_checker.double_grad_check([x] + w,
                                               y,
                                               x_init=[x_arr] + w_arr,
                                               place=place,
                                               eps=eps)
        gradient_checker.double_grad_check_for_dygraph(
            self.conv_transpose_wrapper, [x] + w,
            y,
            x_init=[x_arr] + w_arr,
            place=place)


class TestConvTranspose2DoubleGradCheck_PaddingVALID(
        TestConvTransposeDoubleGradCheck):

    def conv_transpose_wrapper(self, x):
        return paddle.nn.functional.conv2d_transpose(x[0],
                                                     x[1],
                                                     groups=1,
                                                     padding="VALID")

    @prog_scope()
    def func(self, place):
        shape = [2, 2, 3, 3]
        eps = 0.005
        dtype = np.float64
        if core.is_compiled_with_rocm():
            dtype = np.float32
        x = layers.data('x', shape, False, dtype)
        y = layers.conv2d_transpose(input=x,
                                    num_filters=2,
                                    filter_size=1,
                                    padding="VALID",
                                    bias_attr=False,
                                    use_cudnn=True)
        x_arr = np.random.uniform(-1, 1, shape).astype(dtype)

        w = fluid.default_main_program().global_block().all_parameters()
        w_arr = []
        for p in w:
            w_arr.append(np.random.uniform(-1, 1, p.shape).astype(dtype))
        if core.is_compiled_with_rocm():
            # HIP will sometimes fail if no atol
            gradient_checker.double_grad_check([x] + w,
                                               y,
                                               x_init=[x_arr] + w_arr,
                                               place=place,
                                               eps=eps,
                                               atol=1e-4)
        else:
            gradient_checker.double_grad_check([x] + w,
                                               y,
                                               x_init=[x_arr] + w_arr,
                                               place=place,
                                               eps=eps)
        gradient_checker.double_grad_check_for_dygraph(
            self.conv_transpose_wrapper, [x] + w,
            y,
            x_init=[x_arr] + w_arr,
            place=place)


class TestConvTranspose2DoubleGradCheck_ChannelLast(
        TestConvTransposeDoubleGradCheck):

    def conv_transpose_wrapper(self, x):
        return paddle.nn.functional.conv2d_transpose(x[0],
                                                     x[1],
                                                     groups=1,
                                                     padding=[1, 1],
                                                     data_format="NHWC")

    @prog_scope()
    def func(self, place):
        shape = [2, 3, 3, 2]
        eps = 0.005
        dtype = np.float64
        if core.is_compiled_with_rocm():
            dtype = np.float32
        x = layers.data('x', shape, False, dtype)
        y = layers.conv2d_transpose(input=x,
                                    num_filters=2,
                                    filter_size=1,
                                    padding=[1, 1],
                                    bias_attr=False,
                                    use_cudnn=True,
                                    groups=1,
                                    data_format="NHWC")
        x_arr = np.random.uniform(-1, 1, shape).astype(dtype)

        w = fluid.default_main_program().global_block().all_parameters()
        w_arr = []
        for p in w:
            w_arr.append(np.random.uniform(-1, 1, p.shape).astype(dtype))
        if core.is_compiled_with_rocm():
            # HIP will sometimes fail if no atol
            gradient_checker.double_grad_check([x] + w,
                                               y,
                                               x_init=[x_arr] + w_arr,
                                               place=place,
                                               eps=eps,
                                               atol=1e-4)
        else:
            gradient_checker.double_grad_check([x] + w,
                                               y,
                                               x_init=[x_arr] + w_arr,
                                               place=place,
                                               eps=eps)
        gradient_checker.double_grad_check_for_dygraph(
            self.conv_transpose_wrapper, [x] + w,
            y,
            x_init=[x_arr] + w_arr,
            place=place)


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