#   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 paddle
import unittest
import numpy as np
from test_sum_op import TestReduceOPTensorAxisBase


class TestProdOp(unittest.TestCase):
    def setUp(self):
        self.input = np.random.random(size=(10, 10, 5)).astype(np.float32)

    def run_imperative(self):
        input = paddle.to_tensor(self.input)
        dy_result = paddle.prod(input)
        expected_result = np.prod(self.input)
        np.testing.assert_allclose(
            dy_result.numpy(), expected_result, rtol=1e-05
        )

        dy_result = paddle.prod(input, axis=1)
        expected_result = np.prod(self.input, axis=1)
        np.testing.assert_allclose(
            dy_result.numpy(), expected_result, rtol=1e-05
        )

        dy_result = paddle.prod(input, axis=-1)
        expected_result = np.prod(self.input, axis=-1)
        np.testing.assert_allclose(
            dy_result.numpy(), expected_result, rtol=1e-05
        )

        dy_result = paddle.prod(input, axis=[0, 1])
        expected_result = np.prod(self.input, axis=(0, 1))
        np.testing.assert_allclose(
            dy_result.numpy(), expected_result, rtol=1e-05, atol=1e-8
        )

        dy_result = paddle.prod(input, axis=1, keepdim=True)
        expected_result = np.prod(self.input, axis=1, keepdims=True)
        np.testing.assert_allclose(
            dy_result.numpy(), expected_result, rtol=1e-05
        )

        dy_result = paddle.prod(input, axis=1, dtype='int64')
        expected_result = np.prod(self.input, axis=1, dtype=np.int64)
        np.testing.assert_allclose(
            dy_result.numpy(), expected_result, rtol=1e-05
        )

        dy_result = paddle.prod(input, axis=1, keepdim=True, dtype='int64')
        expected_result = np.prod(
            self.input, axis=1, keepdims=True, dtype=np.int64
        )
        np.testing.assert_allclose(
            dy_result.numpy(), expected_result, rtol=1e-05
        )

    def run_static(self, use_gpu=False):
        input = paddle.fluid.data(
            name='input', shape=[10, 10, 5], dtype='float32'
        )
        result0 = paddle.prod(input)
        result1 = paddle.prod(input, axis=1)
        result2 = paddle.prod(input, axis=-1)
        result3 = paddle.prod(input, axis=[0, 1])
        result4 = paddle.prod(input, axis=1, keepdim=True)
        result5 = paddle.prod(input, axis=1, dtype='int64')
        result6 = paddle.prod(input, axis=1, keepdim=True, dtype='int64')

        place = paddle.CUDAPlace(0) if use_gpu else paddle.CPUPlace()
        exe = paddle.static.Executor(place)
        exe.run(paddle.static.default_startup_program())
        static_result = exe.run(
            feed={"input": self.input},
            fetch_list=[
                result0,
                result1,
                result2,
                result3,
                result4,
                result5,
                result6,
            ],
        )

        expected_result = np.prod(self.input)
        np.testing.assert_allclose(
            static_result[0], expected_result, rtol=1e-05
        )
        expected_result = np.prod(self.input, axis=1)
        np.testing.assert_allclose(
            static_result[1], expected_result, rtol=1e-05
        )
        expected_result = np.prod(self.input, axis=-1)
        np.testing.assert_allclose(
            static_result[2], expected_result, rtol=1e-05
        )
        expected_result = np.prod(self.input, axis=(0, 1))
        np.testing.assert_allclose(
            static_result[3], expected_result, rtol=1e-05, atol=1e-8
        )
        expected_result = np.prod(self.input, axis=1, keepdims=True)
        np.testing.assert_allclose(
            static_result[4], expected_result, rtol=1e-05
        )
        expected_result = np.prod(self.input, axis=1, dtype=np.int64)
        np.testing.assert_allclose(
            static_result[5], expected_result, rtol=1e-05
        )
        expected_result = np.prod(
            self.input, axis=1, keepdims=True, dtype=np.int64
        )
        np.testing.assert_allclose(
            static_result[6], expected_result, rtol=1e-05
        )

    def test_cpu(self):
        paddle.disable_static(place=paddle.CPUPlace())
        self.run_imperative()
        paddle.enable_static()

        with paddle.static.program_guard(paddle.static.Program()):
            self.run_static()

    def test_gpu(self):
        if not paddle.fluid.core.is_compiled_with_cuda():
            return

        paddle.disable_static(place=paddle.CUDAPlace(0))
        self.run_imperative()
        paddle.enable_static()

        with paddle.static.program_guard(paddle.static.Program()):
            self.run_static(use_gpu=True)


class TestProdOpError(unittest.TestCase):
    def test_error(self):
        with paddle.static.program_guard(
            paddle.static.Program(), paddle.static.Program()
        ):
            x = paddle.fluid.data(name='x', shape=[2, 2, 4], dtype='float32')
            bool_x = paddle.fluid.data(
                name='bool_x', shape=[2, 2, 4], dtype='bool'
            )
            # The argument x shoule be a Tensor
            self.assertRaises(TypeError, paddle.prod, [1])

            # The data type of x should be float32, float64, int32, int64
            self.assertRaises(TypeError, paddle.prod, bool_x)

            # The argument axis's type shoule be int ,list or tuple
            self.assertRaises(TypeError, paddle.prod, x, 1.5)

            # The argument dtype of prod_op should be float32, float64, int32 or int64.
            self.assertRaises(TypeError, paddle.prod, x, 'bool')


class TestProdWithTensorAxis1(TestReduceOPTensorAxisBase):
    def init_data(self):
        self.pd_api = paddle.prod
        self.np_api = np.prod
        self.x = paddle.randn([10, 5, 9, 9], dtype='float64')
        self.np_axis = np.array([1, 2], dtype='int64')
        self.tensor_axis = paddle.to_tensor([1, 2], dtype='int64')


class TestProdWithTensorAxis2(TestReduceOPTensorAxisBase):
    def init_data(self):
        self.pd_api = paddle.prod
        self.np_api = np.prod
        self.x = paddle.randn([10, 10, 9, 9], dtype='float64')
        self.np_axis = np.array([0, 1, 2], dtype='int64')
        self.tensor_axis = [
            0,
            paddle.to_tensor([1], 'int64'),
            paddle.to_tensor([2], 'int64'),
        ]


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