# Copyright 2024 Bytedance Ltd. and/or its affiliates
# Copyright (c) 2024, 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.
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from megatron.core.optimizer import OptimizerConfig
from megatron.core.optimizer import get_megatron_optimizer as get_megatron_optimizer_native


def get_megatron_optimizer(
    model,
    config: OptimizerConfig,
    no_weight_decay_cond=None,
    scale_lr_cond=None,
    lr_mult=1.0,
):
    # Base optimizer.
    return get_megatron_optimizer_native(
        config=config,
        model_chunks=model,
        no_weight_decay_cond=no_weight_decay_cond,
        scale_lr_cond=scale_lr_cond,
        lr_mult=lr_mult,
    )


# TODO: add get_optimizer_param_scheduler(optimizer) to implement lr scheuler.