# 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.common.dtype as mstype
import mindspore.nn as nn
from mindspore import Tensor
from mindspore import context
from mindspore.common.api import _executor
from mindspore.context import set_auto_parallel_context
from mindspore.ops import composite as C
from mindspore.ops import operations as P
from tests.ut.python.ops.test_math_ops import VirtualLoss


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 C.grad_all(self.network)(x, y)


def compile_net(net, x, y):
    net.set_auto_parallel()
    _executor.compile(net, x, y)


# model_parallel test
def test_two_matmul():
    class Net(nn.Cell):
        def __init__(self, strategy1, strategy2, strategy3):
            super().__init__()
            self.matmul1 = P.MatMul().set_strategy(strategy1)
            self.matmul2 = P.MatMul().set_strategy(strategy2)
            self.matmul3 = P.MatMul().set_strategy(strategy3)
            self.diag = P.Diag()
            self.fill = P.Fill()

        def construct(self, x, y):
            fill = self.diag(self.fill(mstype.float32, (128,), 1.0))
            out1 = self.matmul1(fill, x)
            out2 = self.matmul2(y, fill)
            out = self.matmul3(out1, out2)
            return out

    set_auto_parallel_context(device_num=8, global_rank=0)
    strategy1 = ((2, 2), (2, 2))
    strategy2 = ((1, 8), (8, 1))
    strategy3 = ((2, 4), (4, 1))
    net = GradWrap(NetWithLoss(Net(strategy1, strategy2, strategy3)))
    context.set_auto_parallel_context(parallel_mode="semi_auto_parallel")

    x = Tensor(np.ones([128, 32]), dtype=ms.float32)
    y = Tensor(np.ones([32, 128]), dtype=ms.float32)

    compile_net(net, x, y)


def test_matmul_mul_broadcast2():
    class Net(nn.Cell):
        def __init__(self, strategy1, strategy2):
            super().__init__()
            self.matmul = P.MatMul().set_strategy(strategy1)
            self.mul = P.Mul().set_strategy(strategy2)
            self.t = Tensor(0.9, ms.float32)

        def construct(self, x, y):
            out = self.matmul(x, y)
            out = self.mul(out, self.t)
            return out

    context.set_auto_parallel_context(device_num=8, global_rank=0)
    strategy1 = ((2, 4), (4, 1))
    strategy2 = ((4, 1), ())
    net = GradWrap(NetWithLoss(Net(strategy1, strategy2)))
    context.set_auto_parallel_context(parallel_mode="semi_auto_parallel")

    x = Tensor(np.ones([64, 32]), dtype=ms.float32)
    y = Tensor(np.ones([32, 1]), dtype=ms.float32)
    compile_net(net, x, y)


def test_two_matmul1():
    class Net(nn.Cell):
        def __init__(self, strategy1, strategy2, strategy3):
            super().__init__()
            self.matmul1 = P.MatMul().set_strategy(strategy1)
            self.matmul2 = P.MatMul().set_strategy(strategy2)
            self.matmul3 = P.MatMul().set_strategy(strategy3)
            self.diag = P.Diag()
            self.fill = P.Fill()

        def construct(self, x, y):
            fill = self.diag(self.fill(mstype.float32, (128,), 1.0))
            out1 = self.matmul1(fill, x)
            out2 = self.matmul2(fill, y)
            out = self.matmul3(out1, out2)
            return out

    set_auto_parallel_context(device_num=8, global_rank=0)
    strategy1 = ((2, 2), (2, 2))
    strategy2 = ((1, 8), (8, 1))
    strategy3 = ((2, 4), (4, 1))
    net = GradWrap(NetWithLoss(Net(strategy1, strategy2, strategy3)))
    context.set_auto_parallel_context(parallel_mode="semi_auto_parallel")

    x = Tensor(np.ones([128, 128]), dtype=ms.float32)
    y = Tensor(np.ones([128, 128]), dtype=ms.float32)

    compile_net(net, x, y)


def test_matmul_add_tensor():
    class Net(nn.Cell):
        def __init__(self, strategy1, strategy2):
            super().__init__()
            self.matmul = P.MatMul().set_strategy(strategy1)
            self.add = P.TensorAdd().set_strategy(strategy2)
            self.b = Tensor(0.9, ms.float32)

        def construct(self, x, y):
            out = self.matmul(x, y)
            out = self.add(out, self.b)
            return out

    context.set_auto_parallel_context(device_num=8, global_rank=0)
    strategy1 = ((2, 2), (2, 2))
    strategy2 = ((4, 2), ())
    net = GradWrap(NetWithLoss(Net(strategy1, strategy2)))
    context.set_auto_parallel_context(parallel_mode="semi_auto_parallel")

    x = Tensor(np.ones([64, 32]), dtype=ms.float32)
    y = Tensor(np.ones([32, 64]), dtype=ms.float32)

    compile_net(net, x, y)