# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
# Copyright (c) 2021 NVIDIA Corporation.  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
import paddle.fluid as fluid
import paddle.fluid.core as core
from paddle.fluid.contrib.sparsity.asp import ASPHelper

paddle.enable_static()


class TestASPHelperPruningBase(unittest.TestCase):
    def setUp(self):
        self.main_program = fluid.Program()
        self.startup_program = fluid.Program()

        def build_model():
            img = fluid.data(
                name='img', shape=[None, 3, 32, 32], dtype='float32'
            )
            label = fluid.data(name='label', shape=[None, 1], dtype='int64')
            hidden = fluid.layers.conv2d(
                input=img, num_filters=4, filter_size=3, padding=2, act="relu"
            )
            hidden = fluid.layers.fc(input=hidden, size=32, act='relu')
            prediction = fluid.layers.fc(input=hidden, size=10, act='softmax')
            return img, label, prediction

        with fluid.program_guard(self.main_program, self.startup_program):
            self.img, self.label, self.predict = build_model()

    def run_inference_pruning_test(
        self, get_mask_gen_func, get_mask_check_func
    ):
        place = paddle.CPUPlace()
        if core.is_compiled_with_cuda():
            place = paddle.CUDAPlace(0)
        exe = fluid.Executor(place)

        self.__pruning_and_checking(
            exe, place, get_mask_gen_func, get_mask_check_func, False
        )

    def run_training_pruning_test(self, get_mask_gen_func, get_mask_check_func):
        with fluid.program_guard(self.main_program, self.startup_program):
            loss = paddle.mean(
                paddle.nn.functional.cross_entropy(
                    input=self.predict,
                    label=self.label,
                    reduction='none',
                    use_softmax=False,
                )
            )
            optimizer = paddle.incubate.asp.decorate(
                fluid.optimizer.SGD(learning_rate=0.01)
            )
            optimizer.minimize(loss, self.startup_program)

        place = paddle.CPUPlace()
        if core.is_compiled_with_cuda():
            place = paddle.CUDAPlace(0)
        exe = fluid.Executor(place)

        self.__pruning_and_checking(
            exe, place, get_mask_gen_func, get_mask_check_func, True
        )

    def __pruning_and_checking(
        self, exe, place, mask_func_name, check_func_name, with_mask
    ):
        exe.run(self.startup_program)
        paddle.incubate.asp.prune_model(
            self.main_program, mask_algo=mask_func_name, with_mask=with_mask
        )
        for param in self.main_program.global_block().all_parameters():
            if ASPHelper._is_supported_layer(self.main_program, param.name):
                mat = np.array(
                    fluid.global_scope().find_var(param.name).get_tensor()
                )
                self.assertTrue(
                    paddle.fluid.contrib.sparsity.check_sparsity(
                        mat.T, func_name=check_func_name, n=2, m=4
                    )
                )