#   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.

from __future__ import print_function
from __future__ import division

import unittest
import numpy as np
import paddle
import paddle.fluid.core as core
from op_test import OpTest
import paddle.fluid as fluid
from paddle.nn.functional import avg_pool3d, max_pool3d
from test_pool3d_op import adaptive_start_index, adaptive_end_index, pool3D_forward_naive


class TestPool3d_API(unittest.TestCase):
    def setUp(self):
        np.random.seed(123)
        self.places = [fluid.CPUPlace()]
        if core.is_compiled_with_cuda():
            self.places.append(fluid.CUDAPlace(0))

    def check_avg_static_results(self, place):
        with fluid.program_guard(fluid.Program(), fluid.Program()):
            input = fluid.data(
                name="input", shape=[2, 3, 32, 32, 32], dtype="float32")
            result = avg_pool3d(input, kernel_size=2, stride=2, padding=0)

            input_np = np.random.random([2, 3, 32, 32, 32]).astype("float32")
            result_np = pool3D_forward_naive(
                input_np,
                ksize=[2, 2, 2],
                strides=[2, 2, 2],
                paddings=[0, 0, 0],
                pool_type='avg')

            exe = fluid.Executor(place)
            fetches = exe.run(fluid.default_main_program(),
                              feed={"input": input_np},
                              fetch_list=[result])
            self.assertTrue(np.allclose(fetches[0], result_np))

    def check_avg_dygraph_results(self, place):
        with fluid.dygraph.guard(place):
            input_np = np.random.random([2, 3, 32, 32, 32]).astype("float32")
            input = fluid.dygraph.to_variable(input_np)
            result = avg_pool3d(input, kernel_size=2, stride=2, padding="SAME")

            result_np = pool3D_forward_naive(
                input_np,
                ksize=[2, 2, 2],
                strides=[2, 2, 2],
                paddings=[0, 0, 0],
                pool_type='avg',
                padding_algorithm="SAME")

            self.assertTrue(np.allclose(result.numpy(), result_np))

            avg_pool3d_dg = paddle.nn.layer.AvgPool3d(
                kernel_size=2, stride=None, padding="SAME")
            result = avg_pool3d_dg(input)
            self.assertTrue(np.allclose(result.numpy(), result_np))

    def check_max_static_results(self, place):
        with fluid.program_guard(fluid.Program(), fluid.Program()):
            input = fluid.data(
                name="input", shape=[2, 3, 32, 32, 32], dtype="float32")
            result = max_pool3d(input, kernel_size=2, stride=2, padding=0)

            input_np = np.random.random([2, 3, 32, 32, 32]).astype("float32")
            result_np = pool3D_forward_naive(
                input_np,
                ksize=[2, 2, 2],
                strides=[2, 2, 2],
                paddings=[0, 0, 0],
                pool_type='max')

            exe = fluid.Executor(place)
            fetches = exe.run(fluid.default_main_program(),
                              feed={"input": input_np},
                              fetch_list=[result])
            self.assertTrue(np.allclose(fetches[0], result_np))

    def check_max_dygraph_results(self, place):
        with fluid.dygraph.guard(place):
            input_np = np.random.random([2, 3, 32, 32, 32]).astype("float32")
            input = fluid.dygraph.to_variable(input_np)
            result = max_pool3d(input, kernel_size=2, stride=2, padding=0)

            result_np = pool3D_forward_naive(
                input_np,
                ksize=[2, 2, 2],
                strides=[2, 2, 2],
                paddings=[0, 0, 0],
                pool_type='max')

            self.assertTrue(np.allclose(result.numpy(), result_np))
            max_pool3d_dg = paddle.nn.layer.MaxPool3d(
                kernel_size=2, stride=None, padding=0)
            result = max_pool3d_dg(input)
            self.assertTrue(np.allclose(result.numpy(), result_np))

    def check_max_dygraph_stride_is_none(self, place):
        with fluid.dygraph.guard(place):
            input_np = np.random.random([2, 3, 32, 32, 32]).astype("float32")
            input = fluid.dygraph.to_variable(input_np)
            result, indices = max_pool3d(
                input,
                kernel_size=2,
                stride=None,
                padding="SAME",
                return_indices=True)

            result_np = pool3D_forward_naive(
                input_np,
                ksize=[2, 2, 2],
                strides=[2, 2, 2],
                paddings=[0, 0, 0],
                pool_type='max',
                padding_algorithm="SAME")

            self.assertTrue(np.allclose(result.numpy(), result_np))
            max_pool3d_dg = paddle.nn.layer.MaxPool3d(
                kernel_size=2, stride=2, padding=0)
            result = max_pool3d_dg(input)
            self.assertTrue(np.allclose(result.numpy(), result_np))

    def check_max_dygraph_padding(self, place):
        with fluid.dygraph.guard(place):
            input_np = np.random.random([2, 3, 32, 32, 32]).astype("float32")
            input = fluid.dygraph.to_variable(input_np)
            padding = [[0, 0], [0, 0], [0, 0], [0, 0], [0, 0]]
            result = max_pool3d(input, kernel_size=2, stride=2, padding=padding)

            result_np = pool3D_forward_naive(
                input_np,
                ksize=[2, 2, 2],
                strides=[2, 2, 2],
                paddings=[0, 0, 0],
                pool_type='max')

            self.assertTrue(np.allclose(result.numpy(), result_np))
            max_pool3d_dg = paddle.nn.layer.MaxPool3d(
                kernel_size=2, stride=2, padding=0)
            result = max_pool3d_dg(input)
            self.assertTrue(np.allclose(result.numpy(), result_np))

            padding = [0, 0, 0, 0, 0, 0]
            result = max_pool3d(input, kernel_size=2, stride=2, padding=padding)
            self.assertTrue(np.allclose(result.numpy(), result_np))

    def check_avg_divisor(self, place):
        with fluid.dygraph.guard(place):
            input_np = np.random.random([2, 3, 32, 32, 32]).astype("float32")
            input = fluid.dygraph.to_variable(input_np)
            padding = 0
            result = avg_pool3d(
                input,
                kernel_size=2,
                stride=2,
                padding=padding,
                divisor_override=8)

            result_np = pool3D_forward_naive(
                input_np,
                ksize=[2, 2, 2],
                strides=[2, 2, 2],
                paddings=[0, 0, 0],
                pool_type='avg')

            self.assertTrue(np.allclose(result.numpy(), result_np))
            avg_pool3d_dg = paddle.nn.layer.AvgPool3d(
                kernel_size=2, stride=2, padding=0)
            result = avg_pool3d_dg(input)
            self.assertTrue(np.allclose(result.numpy(), result_np))

            padding = [0, 0, 0, 0, 0, 0]
            result = avg_pool3d(
                input,
                kernel_size=2,
                stride=2,
                padding=padding,
                divisor_override=8)
            self.assertTrue(np.allclose(result.numpy(), result_np))

    def test_pool3d(self):
        for place in self.places:

            self.check_max_dygraph_results(place)
            self.check_avg_dygraph_results(place)
            self.check_max_static_results(place)
            self.check_avg_static_results(place)
            self.check_max_dygraph_stride_is_none(place)
            self.check_max_dygraph_padding(place)
            self.check_avg_divisor(place)


class TestPool3dError_API(unittest.TestCase):
    def test_error_api(self):
        def run1():
            with fluid.dygraph.guard():
                input_np = np.random.uniform(
                    -1, 1, [2, 3, 32, 32, 32]).astype(np.float32)
                input_pd = fluid.dygraph.to_variable(input_np)
                padding = [[0, 1], [0, 0], [0, 0], [0, 0], [0, 0]]
                res_pd = avg_pool3d(
                    input_pd, kernel_size=2, stride=2, padding=padding)

        self.assertRaises(ValueError, run1)

        def run2():
            with fluid.dygraph.guard():
                input_np = np.random.uniform(
                    -1, 1, [2, 3, 32, 32, 32]).astype(np.float32)
                input_pd = fluid.dygraph.to_variable(input_np)
                padding = [[0, 1], [0, 0], [0, 0], [0, 0], [0, 0]]
                res_pd = avg_pool3d(
                    input_pd,
                    kernel_size=2,
                    stride=2,
                    padding=padding,
                    data_format='NCDHW')

        self.assertRaises(ValueError, run2)

        def run3():
            with fluid.dygraph.guard():
                input_np = np.random.uniform(
                    -1, 1, [2, 3, 32, 32, 32]).astype(np.float32)
                input_pd = fluid.dygraph.to_variable(input_np)
                padding = [[0, 1], [0, 0], [0, 0], [0, 0], [0, 0]]
                res_pd = avg_pool3d(
                    input_pd,
                    kernel_size=2,
                    stride=2,
                    padding=padding,
                    data_format='NDHWC')

        self.assertRaises(ValueError, run3)

        def run4():
            with fluid.dygraph.guard():
                input_np = np.random.uniform(
                    -1, 1, [2, 3, 32, 32, 32]).astype(np.float32)
                input_pd = fluid.dygraph.to_variable(input_np)
                res_pd = avg_pool3d(
                    input_pd,
                    kernel_size=2,
                    stride=2,
                    padding=0,
                    data_format='NNNN')

        self.assertRaises(ValueError, run4)

        def run5():
            with fluid.dygraph.guard():
                input_np = np.random.uniform(
                    -1, 1, [2, 3, 32, 32, 32]).astype(np.float32)
                input_pd = fluid.dygraph.to_variable(input_np)
                res_pd = max_pool3d(
                    input_pd,
                    kernel_size=2,
                    stride=2,
                    padding=0,
                    data_format='NNNN')

        self.assertRaises(ValueError, run5)

        def run6():
            with fluid.dygraph.guard():
                input_np = np.random.uniform(
                    -1, 1, [2, 3, 32, 32, 32]).astype(np.float32)
                input_pd = fluid.dygraph.to_variable(input_np)
                res_pd = avg_pool3d(
                    input_pd,
                    kernel_size=2,
                    stride=2,
                    padding="padding",
                    data_format='NNNN')

        self.assertRaises(ValueError, run6)

        def run7():
            with fluid.dygraph.guard():
                input_np = np.random.uniform(
                    -1, 1, [2, 3, 32, 32, 32]).astype(np.float32)
                input_pd = fluid.dygraph.to_variable(input_np)
                res_pd = max_pool3d(
                    input_pd,
                    kernel_size=2,
                    stride=2,
                    padding="padding",
                    data_format='NNNN')

        self.assertRaises(ValueError, run7)

        def run8():
            with fluid.dygraph.guard():
                input_np = np.random.uniform(
                    -1, 1, [2, 3, 32, 32, 32]).astype(np.float32)
                input_pd = fluid.dygraph.to_variable(input_np)
                res_pd = avg_pool3d(
                    input_pd,
                    kernel_size=2,
                    stride=2,
                    padding="VALID",
                    ceil_mode=True,
                    data_format='NNNN')

        self.assertRaises(ValueError, run8)

        def run9():
            with fluid.dygraph.guard():
                input_np = np.random.uniform(
                    -1, 1, [2, 3, 32, 32, 32]).astype(np.float32)
                input_pd = fluid.dygraph.to_variable(input_np)
                res_pd = max_pool3d(
                    input_pd,
                    kernel_size=2,
                    stride=2,
                    padding="VALID",
                    ceil_mode=True,
                    data_format='NNNN')

        self.assertRaises(ValueError, run9)


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