#   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 math
from op_test import OpTest
import paddle.fluid as fluid
import paddle.fluid.core as core
import paddle.nn.functional as functional
import paddle.fluid.framework as framework
from paddle.fluid.framework import Program, program_guard


class TestOneHotOp(OpTest):
    def setUp(self):
        self.op_type = 'one_hot_v2'
        depth = 10
        depth_np = np.array(10).astype('int32')
        dimension = 12
        x_lod = [[4, 1, 3, 3]]
        x = [np.random.randint(0, depth - 1) for i in range(sum(x_lod[0]))]
        x = np.array(x).astype('int32').reshape([sum(x_lod[0])])

        out = np.zeros(shape=(np.product(x.shape), depth)).astype('float32')

        for i in range(np.product(x.shape)):
            out[i, x[i]] = 1.0

        self.inputs = {'X': (x, x_lod), 'depth_tensor': depth_np}
        self.attrs = {'dtype': int(core.VarDesc.VarType.FP32)}
        self.outputs = {'Out': (out, x_lod)}

    def test_check_output(self):
        self.check_output(check_dygraph=False)


class TestOneHotOp_attr(OpTest):
    def setUp(self):
        self.op_type = 'one_hot_v2'
        depth = 10
        dimension = 12
        x_lod = [[4, 1, 3, 3]]
        x = [np.random.randint(0, depth - 1) for i in range(sum(x_lod[0]))]
        x = np.array(x).astype('int32').reshape([sum(x_lod[0]), 1])

        out = np.zeros(shape=(np.product(x.shape[:-1]), 1,
                              depth)).astype('float32')

        for i in range(np.product(x.shape)):
            out[i, 0, x[i]] = 1.0

        self.inputs = {'X': (x, x_lod)}
        self.attrs = {'dtype': int(core.VarDesc.VarType.FP32), 'depth': depth}
        self.outputs = {'Out': (out, x_lod)}

    def test_check_output(self):
        self.check_output(check_dygraph=False)


class TestOneHotOp_default_dtype(OpTest):
    def setUp(self):
        self.op_type = 'one_hot_v2'
        depth = 10
        depth_np = np.array(10).astype('int32')
        dimension = 12
        x_lod = [[4, 1, 3, 3]]
        x = [np.random.randint(0, depth - 1) for i in range(sum(x_lod[0]))]
        x = np.array(x).astype('int32').reshape([sum(x_lod[0])])

        out = np.zeros(shape=(np.product(x.shape), depth)).astype('float32')

        for i in range(np.product(x.shape)):
            out[i, x[i]] = 1.0

        self.inputs = {'X': (x, x_lod), 'depth_tensor': depth_np}
        self.attrs = {}
        self.outputs = {'Out': (out, x_lod)}

    def test_check_output(self):
        self.check_output(check_dygraph=False)


class TestOneHotOp_default_dtype_attr(OpTest):
    def setUp(self):
        self.op_type = 'one_hot_v2'
        depth = 10
        dimension = 12
        x_lod = [[4, 1, 3, 3]]
        x = [np.random.randint(0, depth - 1) for i in range(sum(x_lod[0]))]
        x = np.array(x).astype('int32').reshape([sum(x_lod[0]), 1])

        out = np.zeros(shape=(np.product(x.shape[:-1]), 1,
                              depth)).astype('float32')

        for i in range(np.product(x.shape)):
            out[i, 0, x[i]] = 1.0

        self.inputs = {'X': (x, x_lod)}
        self.attrs = {'depth': depth}
        self.outputs = {'Out': (out, x_lod)}

    def test_check_output(self):
        self.check_output(check_dygraph=False)


class TestOneHotOp_exception(unittest.TestCase):
    def setUp(self):
        self.op_type = 'one_hot_v2'
        self.depth = 10
        self.place = core.CPUPlace()
        self.dimension = 12
        self.x = core.LoDTensor()
        x_lod = [[4, 1, 3, 3]]
        data = [np.random.randint(11, 20) for i in range(sum(x_lod[0]))]
        data = np.array(data).astype('int').reshape([sum(x_lod[0]), 1])
        self.x.set(data, self.place)
        self.x.set_recursive_sequence_lengths(x_lod)

    def test_check_output(self):
        program = Program()
        with program_guard(program):
            x = fluid.layers.data(
                name='x', shape=[self.dimension], dtype='float32', lod_level=1)
            block = program.current_block()
            one_hot_out = block.create_var(
                name="one_hot_out",
                type=core.VarDesc.VarType.LOD_TENSOR,
                dtype='float32')
            block.append_op(
                type='one_hot',
                inputs={'X': x},
                attrs={'depth': self.depth},
                outputs={'Out': one_hot_out})
            exe = fluid.Executor(self.place)

            def run():
                exe.run(feed={'x': self.x},
                        fetch_list=[one_hot_out],
                        return_numpy=False)

            self.assertRaises(core.EnforceNotMet, run)


class TestOneHotOpApi(unittest.TestCase):
    def test_api(self):
        num_classes = 10
        self._run(num_classes)

    def test_api_with_depthTensor(self):
        num_classes = fluid.layers.assign(input=np.array([10], dtype=np.int32))
        self._run(num_classes)

    def test_api_with_dygraph(self):
        num_classes = 10
        label = np.array(
            [np.random.randint(0, num_classes - 1)
             for i in range(6)]).reshape([6, 1])
        with fluid.dygraph.guard():
            one_hot_label = functional.one_hot(
                x=fluid.dygraph.to_variable(label), num_classes=num_classes)

    def _run(self, num_classes):
        label = fluid.layers.data(name="label", shape=[1], dtype="int64")
        one_hot_label = functional.one_hot(x=label, num_classes=num_classes)

        place = fluid.CPUPlace()
        label_data = np.array([np.random.randint(0, 10 - 1)
                               for i in range(6)]).reshape([6, 1])

        exe = fluid.Executor(place)
        exe.run(fluid.default_startup_program())
        ret = exe.run(feed={'label': label_data, },
                      fetch_list=[one_hot_label],
                      return_numpy=False)


class BadInputTestOnehotV2(unittest.TestCase):
    def test_error(self):
        with fluid.program_guard(fluid.Program()):

            def test_bad_x():
                label = fluid.layers.data(
                    name="label",
                    shape=[4],
                    append_batch_size=False,
                    dtype="float32")
                one_hot_label = functional.one_hot(x=label, num_classes=4)

            self.assertRaises(TypeError, test_bad_x)


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