# Copyright (c) 2021 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 unittest
from unittest import TestCase

import numpy as np
from op_test import get_places

import paddle
import paddle.base.dygraph as dg
import paddle.nn.functional as F


class TestFunctionalConv1DError(TestCase):
    def setUp(self):
        self.input = []
        self.filter = []
        self.bias = None
        self.padding = 0
        self.stride = 1
        self.dilation = 1
        self.groups = 1
        self.data_format = "NCL"

    def dygraph_case(self):
        with dg.guard():
            x = paddle.to_tensor(self.input, dtype=paddle.float32)
            w = paddle.to_tensor(self.filter, dtype=paddle.float32)
            b = (
                None
                if self.bias is None
                else paddle.to_tensor(self.bias, dtype=paddle.float32)
            )
            y = F.conv1d(
                x,
                w,
                b,
                padding=self.padding,
                stride=self.stride,
                dilation=self.dilation,
                groups=self.groups,
                data_format=self.data_format,
            )

    def test_exception(self):
        with self.assertRaises(ValueError):
            self.dygraph_case()


class TestFunctionalConv1DErrorCase1(TestFunctionalConv1DError):
    def setUp(self):
        self.input = np.random.randn(1, 3, 3)
        self.filter = np.random.randn(3, 3, 1)
        self.bias = None
        self.padding = 0
        self.stride = 1
        self.dilation = 1
        self.groups = 0
        self.data_format = "NCL"


class TestFunctionalConv1D_CPU_FP16(TestCase):
    def setUp(self):
        self.padding = 0
        self.stride = 1
        self.dilation = 1
        self.groups = 1
        self.data_format = "NCL"

    def test_cpu_fp16(self):
        with dg.guard(paddle.CPUPlace()):
            x = paddle.ones([1, 1, 1])
            w = paddle.ones([1, 1, 1]).astype(paddle.float16)
            b = paddle.ones([1]).astype(paddle.float16)
            y = F.conv1d(
                x,
                w,
                b,
                padding=self.padding,
                stride=self.stride,
                dilation=self.dilation,
                groups=self.groups,
                data_format=self.data_format,
            )
            np.testing.assert_allclose(y.numpy(), [[[2]]])


class TestFunctionalConv1D_ZeroSize(TestCase):
    def init_data(self):
        self.input = np.random.randn(0, 1, 2)
        self.filter = np.random.randn(1, 1, 2)
        self.np_out = np.zeros([0, 1, 1])

    def setUp(self):
        self.init_data()
        self.bias = None
        self.padding = 0
        self.stride = 1
        self.dilation = 1
        self.groups = 1
        self.data_format = "NCL"
        self.places = get_places()

    def test_dygraph(self):
        for place in self.places:
            with dg.guard(place):
                input = paddle.to_tensor(self.input)
                input.stop_gradient = False
                filter = paddle.to_tensor(self.filter)
                filter.stop_gradient = False
                y = F.conv1d(
                    input,
                    filter,
                    self.bias,
                    padding=self.padding,
                    stride=self.stride,
                    dilation=self.dilation,
                    groups=self.groups,
                    data_format=self.data_format,
                )
                np.testing.assert_allclose(y.numpy(), self.np_out)
                loss = y.sum()
                loss.backward()
                np.testing.assert_allclose(input.grad.shape, input.shape)
                np.testing.assert_allclose(filter.grad, np.zeros(filter.shape))


class TestFunctionalConv1D_ZeroSize2(TestFunctionalConv1D_ZeroSize):
    def init_data(self):
        self.input = np.random.randn(0, 0, 2)
        self.filter = np.random.randn(1, 0, 2)
        self.np_out = np.zeros([0, 0, 1])


class TestFunctionalConv1D_ZeroKernelError(TestCase):
    """kernel_size=0 should raise InvalidArgument, not crash with CUDA error."""

    def _assert_raises(self, x_shape, w_shape, **kwargs):
        places = get_places()
        for place in places:
            with dg.guard(place):
                x = paddle.randn(x_shape)
                w = paddle.to_tensor(
                    np.random.randn(*w_shape).astype('float32')
                )
                with self.assertRaises(ValueError):
                    F.conv1d(x, w, **kwargs)

    def test_depthwise_zero_kernel(self):
        # depthwise path (groups == in_channels), kernel_size=0
        self._assert_raises(
            [13, 64, 1007],
            [64, 1, 0],
            padding=3,
            stride=1,
            dilation=1,
            groups=64,
            data_format='NCL',
        )

    def test_depthwise_zero_kernel_small(self):
        # smaller depthwise, kernel_size=0, NCL
        self._assert_raises(
            [2, 3, 4],
            [6, 1, 0],
            padding=0,
            stride=2,
            dilation=1,
            groups=3,
            data_format='NCL',
        )

    def test_depthwise_zero_kernel_nlc(self):
        # NLC data format, kernel_size=0
        self._assert_raises(
            [13, 7, 32],
            [32, 1, 0],
            padding=1,
            stride=1,
            dilation=1,
            groups=32,
            data_format='NLC',
        )

    def test_depthwise_zero_kernel_float64(self):
        places = get_places()
        for place in places:
            with dg.guard(place):
                x = paddle.randn([2, 3, 4]).cast('float64')
                w = paddle.to_tensor(np.random.randn(6, 1, 0).astype('float64'))
                with self.assertRaises(ValueError):
                    F.conv1d(x, w, padding=0, stride=2, groups=3)


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