# Copyright 2019 Huawei Technologies Co., Ltd
#
# 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 numpy as np

import mindspore as ms
import mindspore.nn as nn
from mindspore import Tensor
from mindspore import context
from mindspore.common.api import _cell_graph_executor
from mindspore.ops import composite as C
from mindspore.ops import operations as P
from tests.ut.python.ops.test_math_ops import VirtualLoss


def setup_function():
    context.set_auto_parallel_context(dataset_strategy="full_batch")


grad_all = C.GradOperation(get_all=True)


class NetWithLoss(nn.Cell):
    def __init__(self, network):
        super(NetWithLoss, self).__init__()
        self.loss = VirtualLoss()
        self.network = network

    def construct(self, x, y):
        predict = self.network(x, y)
        return self.loss(predict)


class GradWrap(nn.Cell):
    def __init__(self, network):
        super(GradWrap, self).__init__()
        self.network = network

    def construct(self, x, y):
        return grad_all(self.network)(x, y)


class Net(nn.Cell):
    def __init__(self, axis=0, strategy1=None, strategy2=None, shape=None, target=""):
        super().__init__()
        if shape is None:
            shape = [64, 64]
        self.gatherv2 = P.SparseGatherV2().shard(strategy1).set_device(target)
        self.mul = P.Mul().shard(strategy2)
        self.index = Tensor(np.ones(shape), dtype=ms.int32)
        self.axis = axis

    def construct(self, x, y):
        out = self.gatherv2(x, self.index, self.axis)
        out = self.mul(out, y)
        return out

def compile_net(net, index_shape, emb_shape, device_num=8, parallel_mode="semi_auto_parallel"):
    context.set_auto_parallel_context(device_num=device_num, global_rank=0, parallel_mode=parallel_mode)
    x = Tensor(np.ones(index_shape), dtype=ms.float32)
    y = Tensor(np.ones(emb_shape), dtype=ms.float32)
    net.set_train()
    _cell_graph_executor.compile(net, x, y)

def test_gatherv2_semi_auto0():
    """
    Feature: distribute operator SparseGatherV2 in auto parallel.
    Description: gather net with strategy in semi auto parallel, gather axis is 1.
    Expectation: compile done without error.
    """
    strategy1 = ((8, 1), (1, 1))
    strategy2 = ((4, 2, 1), (4, 2, 1))
    context.set_auto_parallel_context(dataset_strategy="data_parallel")
    net = GradWrap(NetWithLoss(Net(0, strategy1, strategy2)))
    compile_net(net, [64 // 8, 64], [64 // 8, 64, 64])


def test_gatherv2_semi_auto1():
    """
    Feature: distribute operator SparseGatherV2 in auto parallel.
    Description: gather net with strategy in semi auto parallel, gather axis is 1.
    Expectation: compile done without error.
    """
    strategy1 = ((1, 8), (1, 1))
    strategy2 = ((4, 2, 1), (4, 2, 1))
    net = GradWrap(NetWithLoss(Net(1, strategy1, strategy2)))
    compile_net(net, [64, 64], [64, 64, 64])


def test_gatherv2_semi_auto2():
    """
    Feature: distribute operator SparseGatherV2 in auto parallel.
    Description: gather net with strategy in semi auto parallel, gather axis is 1.
    Expectation: compile done without error.
    """
    strategy1 = ((8, 1), (1, 1))
    strategy2 = ((4, 2, 1), (4, 2, 1))
    net = GradWrap(NetWithLoss(Net(1, strategy1, strategy2)))
    compile_net(net, [64, 32], [64, 64, 64])


def test_gatherv2_semi_auto3():
    """
    Feature: distribute operator SparseGatherV2 in auto parallel.
    Description: gather net with strategy in semi auto parallel, gather axis is 1.
    Expectation: compile done without error.
    """
    strategy1 = ((2, 4), (1, 1))
    strategy2 = ((4, 2, 1), (4, 2, 1))
    net = GradWrap(NetWithLoss(Net(1, strategy1, strategy2)))
    compile_net(net, [64, 32], [64, 64, 64])


def test_gatherv2_semi_auto4():
    """
    Feature: distribute operator SparseGatherV2 in auto parallel.
    Description: gather net with strategy in semi auto parallel, gather axis is 0.
    Expectation: compile done without error.
    """
    context.set_auto_parallel_context(dataset_strategy="full_batch")
    strategy2 = ((4, 2, 1), (4, 2, 1))
    net = GradWrap(NetWithLoss(Net(0, None, strategy2)))
    compile_net(net, [64, 32], [64, 64, 32])


def test_gatherv2_semi_auto5():
    """
    Feature: distribute operator SparseGatherV2 in auto parallel.
    Description: gather net with strategy in semi auto parallel, gather axis is 1.
    Expectation: compile done without error.
    """
    strategy2 = ((4, 2, 1), (4, 2, 1))
    net = GradWrap(NetWithLoss(Net(1, None, strategy2)))
    compile_net(net, [64, 32], [64, 64, 64])


def METHOD_NAME():
    """
    Feature: distribute operator SparseGatherV2 in auto parallel.
    Description: gather net with strategy in semi auto parallel, gather axis is 1.
    Expectation: compile done without error.
    """
    context.set_auto_parallel_context(dataset_strategy="full_batch")
    net = GradWrap(NetWithLoss(Net(0)))
    compile_net(net, [64, 32], [64, 64, 32], parallel_mode="auto_parallel")


def test_gatherv2_auto1():
    """
    Feature: distribute operator SparseGatherV2 in auto parallel.
    Description: gather net with strategy in semi auto parallel, gather axis is 1.
    Expectation: compile done without error.
    """
    net = GradWrap(NetWithLoss(Net(1)))
    compile_net(net, [64, 32], [64, 64, 64], parallel_mode="auto_parallel")


def test_gatherv2_cpu0():
    """
    Feature: distribute operator SparseGatherV2 in auto parallel.
    Description: gather net with strategy in semi auto parallel, gather axis is 1. target is cpu.
    Expectation: compile done without error.
    """
    strategy1 = ((8, 1), (1, 1))
    strategy2 = ((4, 2, 1), (4, 2, 1))
    net = NetWithLoss(Net(0, strategy1, strategy2, None, "CPU"))
    compile_net(net, [64, 64], [64, 64, 64])


def test_gatherv2_cpu1():
    """
    Feature: distribute operator SparseGatherV2 in auto parallel.
    Description: gather net with strategy in semi auto parallel, gather axis is 1. target is cpu.
    Expectation: compile done without error.
    """
    strategy1 = ((16, 1), (1, 1))
    strategy2 = ((4, 2, 1), (4, 2, 1))
    net = NetWithLoss(Net(0, strategy1, strategy2, None, "CPU"))
    compile_net(net, [64, 64], [64, 64, 64], device_num=16)


def test_gatherv2_cpu2():
    """
    Feature: distribute operator SparseGatherV2 in auto parallel.
    Description: gather net with strategy in semi auto parallel, gather axis is 1. target is cpu.
    Expectation: compile done without error.
    """
    strategy1 = ((1, 8), (1, 1))
    strategy2 = ((4, 2, 1), (4, 2, 1))
    net = NetWithLoss(Net(0, strategy1, strategy2, None, "CPU"))
    compile_net(net, [64, 64], [64, 64, 64])