#   Copyright (c) 2018 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
import numpy as np
import paddle.fluid as fluid
from op_test import OpTest
from paddle.fluid import Program, program_guard


class TestLodResetOpByAttr(OpTest):
    def setUp(self):
        self.op_type = "lod_reset"
        x = np.random.random((10, 20)).astype("float64")
        lod = [[3, 2, 5]]
        # target_offset_lod and target_lod are the same lod info represented
        # in offset-based format and length-based format, respectively.
        target_offset_lod = [0, 7, 10]
        target_lod = [7, 3]
        self.inputs = {'X': (x, lod)}
        # The `target_lod` attribute is still based on offset
        self.attrs = {'target_lod': target_offset_lod}
        self.outputs = {'Out': (x, [target_lod])}

    def test_check_output(self):
        # TODO(wangzhongpu): support lod in dygraph mode
        self.check_output(check_dygraph=False)

    def test_check_grad(self):
        # TODO(wangzhongpu): support lod in dygraph mode
        self.check_grad(["X"], "Out", check_dygraph=False)


class TestLodResetOpByInput(OpTest):
    def setUp(self):
        self.op_type = "lod_reset"
        x = np.random.random((10, 20)).astype("float64")
        lod = [[3, 2, 5]]
        # target_offset_lod and target_lod are the same lod info represented
        # in offset-based format and length-based format, respectively.
        target_offset_lod = [0, 4, 7, 10]
        target_lod = [4, 3, 3]
        self.inputs = {
            'X': (x, lod),
            'Y': np.array([target_offset_lod]).astype('int32'),
        }
        self.outputs = {'Out': (x, [target_lod])}

    def test_check_output(self):
        # TODO(wangzhongpu): support lod in dygraph mode
        self.check_output(check_dygraph=False)

    def test_check_grad(self):
        # TODO(wangzhongpu): support lod in dygraph mode
        self.check_grad(["X"], "Out", no_grad_set=set("Y"), check_dygraph=False)


class TestLodResetOpBoth(OpTest):
    def setUp(self):
        self.op_type = "lod_reset"
        x = np.random.random((10, 20)).astype("float64")
        lod = [[3, 2, 5]]
        target_offset_lod_attr = [0, 7, 10]
        target_offset_lod_in = [0, 4, 7, 10]
        target_lod_in = [4, 3, 3]
        self.inputs = {
            'X': (x, lod),
            'Y': np.array(target_offset_lod_in).astype('int32'),
        }
        self.attrs = {'target_lod': target_offset_lod_attr}
        self.outputs = {'Out': (x, [target_lod_in])}

    def test_check_output(self):
        # TODO(wangzhongpu): support lod in dygraph mode
        self.check_output(check_dygraph=False)

    def test_check_grad(self):
        # TODO(wangzhongpu): support lod in dygraph mode
        self.check_grad(["X"], "Out", no_grad_set=set("Y"), check_dygraph=False)


class TestLodResetOpYIsLoDTensor(OpTest):
    def setUp(self):
        self.op_type = "lod_reset"
        x = np.random.random((10, 20)).astype("float64")
        lod = [[3, 2, 5]]
        y = np.random.random((10, 10)).astype("float64")
        target_lod = [[4, 3, 3]]
        self.inputs = {'X': (x, lod), 'Y': (y, target_lod)}
        self.outputs = {'Out': (x, target_lod)}

    def test_check_output(self):
        # TODO(wangzhongpu): support lod in dygraph mode
        self.check_output(check_dygraph=False)

    def test_check_grad(self):
        # TODO(wangzhongpu): support lod in dygraph mode
        self.check_grad(["X"], "Out", no_grad_set=set("Y"), check_dygraph=False)


class TestLodAppendOpByAttr(OpTest):
    def setUp(self):
        self.op_type = "lod_reset"
        x = np.random.random((10, 20)).astype("float64")
        lod = [[3, 2, 5]]
        # target_offset_lod and target_lod are the same lod info represented
        # in offset-based format and length-based format, respectively.
        target_offset_lod = [i for i in range(11)]
        self.inputs = {'X': (x, lod)}
        out_lod = [[3, 2, 5], [1] * 10]
        # The `target_lod` attribute is still based on offset
        self.attrs = {'target_lod': target_offset_lod, 'append': True}
        self.outputs = {'Out': (x, out_lod)}

    def test_check_output(self):
        # TODO(wangzhongpu): support lod in dygraph mode
        self.check_output(check_dygraph=False)

    def test_check_grad(self):
        # TODO(wangzhongpu): support lod in dygraph mode
        self.check_grad(["X"], "Out", check_dygraph=False)


class TestLodResetOpError(unittest.TestCase):
    def test_errors(self):
        with program_guard(Program(), Program()):
            # The input must be Variable.
            x1 = np.array([0.9383, 0.1983, 3.2, 1.2]).astype("float64")
            target_lod = [2, 2]
            self.assertRaises(TypeError, fluid.layers.lod_reset, x1, target_lod)

            # Input(x) dtype must be float32 or float64 or int32 or int64
            for dtype in ["bool", "float16"]:
                x2 = fluid.layers.data(
                    name='x2' + dtype, shape=[4], dtype=dtype
                )
                y2 = fluid.layers.data(
                    name='y2' + dtype, shape=[4], dtype='int32', lod_level=2
                )
                self.assertRaises(TypeError, fluid.layers.lod_reset, x2, y2)


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