hybrid_parallel_mp_bf16.py

# Copyright (c) 2023 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.

import unittest

from hybrid_parallel_mp_model import TestDistMPTraning

import paddle
from paddle.distributed import fleet
from paddle.distributed.utils.nccl_utils import check_nccl_version_for_bf16


class TestMPFP16(TestDistMPTraning):
    def build_optimizer(self, model):
        grad_clip = paddle.nn.ClipGradByGlobalNorm(1.0)
        scheduler = paddle.optimizer.lr.ExponentialDecay(
            learning_rate=0.001, gamma=0.999, verbose=True
        )
        optimizer = paddle.optimizer.SGD(
            scheduler, grad_clip=grad_clip, parameters=model.parameters()
        )

        model, optimizer = paddle.amp.decorate(
            models=model,
            optimizers=optimizer,
            dtype='bfloat16',
            level='O2',
            save_dtype='float32',
        )

        return optimizer

    def train_batch(self, batch, model, optimizer, is_mp):
        scaler = paddle.amp.GradScaler(
            init_loss_scaling=1, use_dynamic_loss_scaling=False
        )
        if is_mp:
            scaler = fleet.distributed_scaler(scaler)
        with paddle.amp.auto_cast(enable=True, dtype='bfloat16', level="O2"):
            output = model(batch)
            loss = output.mean()

        scaled = scaler.scale(loss)
        scaled.backward()
        scaler.step(optimizer)
        scaler.update()
        optimizer.clear_grad()
        return scaled


if __name__ == "__main__":
    if (
        check_nccl_version_for_bf16()
        and paddle.device.cuda.get_device_properties().major >= 8
    ):
        unittest.main()