# Copyright (c) 2022 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 engine_api_dp import MyDataset

import paddle
import paddle.nn.functional as F
from paddle import nn
from paddle.distributed.fleet import auto

paddle.enable_static()
batch_size = 16
batch_num = 5
hidden_size = 1024
sequence_len = 512
image_size = hidden_size
class_num = 10

paddle.seed(44)


class MLPLayer(nn.Layer):
    def __init__(
        self,
        hidden_size=1024,
        intermediate_size=4 * 1024,
        dropout_ratio=0.1,
        initializer_range=0.02,
    ):
        super().__init__()
        d_model = hidden_size
        dim_feedforward = intermediate_size
        weight_attr = paddle.ParamAttr(
            initializer=nn.initializer.Normal(mean=0.0, std=initializer_range)
        )
        bias_attr = None

        self.linear0 = nn.Linear(
            d_model, dim_feedforward, weight_attr, bias_attr=bias_attr
        )
        self.linear1 = nn.Linear(
            dim_feedforward, d_model, weight_attr, bias_attr=bias_attr
        )
        self.linear2 = nn.Linear(d_model, 1, weight_attr, bias_attr=bias_attr)
        self.norm = nn.LayerNorm(d_model, epsilon=1e-5)
        self.dropout = nn.Dropout(dropout_ratio, mode="upscale_in_train")

    def forward(self, input):
        out = self.norm(input)
        out = self.linear0(out)
        out = F.gelu(out, approximate=True)
        out = self.linear1(out)
        out = self.dropout(out)
        out = self.linear2(out)
        self.out = out
        return out


def train(fetch):
    mlp = MLPLayer(
        hidden_size=hidden_size,
        intermediate_size=4 * hidden_size,
        dropout_ratio=0.1,
        initializer_range=0.02,
    )
    loss = paddle.nn.CrossEntropyLoss()
    optimizer = paddle.fluid.optimizer.AdamOptimizer(
        learning_rate=0.00001,
        beta1=0.9,
        beta2=0.999,
        epsilon=1e-08,
        grad_clip=None,
    )

    dist_strategy = auto.Strategy()
    dist_strategy.auto_mode = "semi"
    # dp optimization config
    dp_optimization = dist_strategy.dp_optimization
    dp_optimization.enable = True
    # sharding config
    sharding = dist_strategy.sharding
    sharding.enable = True
    sharding.degree = 2
    sharding.stage = 3
    sharding.enable_tuning = True
    sharding.tuning_range = [0, 1, 2, 3]
    # Tuning configuration
    tuning = dist_strategy.tuning
    tuning.enable = True
    tuning.profile_start_step = 1
    tuning.profile_end_step = 5
    tuning.run_after_tuning = True
    tuning.debug = True

    dataset = MyDataset(batch_num * batch_size)
    engine = auto.Engine(
        mlp, loss, optimizer, paddle.metric.Accuracy(), strategy=dist_strategy
    )
    engine._tune(dataset, batch_size=batch_size)

    # check tuned
    assert engine._dist_contexts['train'].strategy.sharding.stage != 3


if __name__ == "__main__":
    train(True)
