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# Copyright 2024 the LlamaFactory team.
#
# 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 typing import TYPE_CHECKING, Any, Dict, Optional
from ...extras.logging import get_logger
from ...extras.misc import get_current_device
if TYPE_CHECKING:
from transformers import PretrainedConfig, PreTrainedModel
from ...hparams import ModelArguments
logger = get_logger(__name__)
def _get_unsloth_kwargs(
config: "PretrainedConfig", model_name_or_path: str, model_args: "ModelArguments"
) -> Dict[str, Any]:
return {
"model_name": model_name_or_path,
"max_seq_length": model_args.model_max_length or 4096,
"dtype": model_args.compute_dtype,
"load_in_4bit": model_args.quantization_bit == 4,
"token": model_args.hf_hub_token,
"device_map": {"": get_current_device()},
"rope_scaling": getattr(config, "rope_scaling", None),
"fix_tokenizer": False,
"trust_remote_code": True,
"use_gradient_checkpointing": "unsloth",
}
def load_unsloth_pretrained_model(
config: "PretrainedConfig", model_args: "ModelArguments"
) -> Optional["PreTrainedModel"]:
r"""
Optionally loads pretrained model with unsloth. Used in training.
"""
from unsloth import FastLanguageModel
unsloth_kwargs = _get_unsloth_kwargs(config, model_args.model_name_or_path, model_args)
try:
model, _ = FastLanguageModel.from_pretrained(**unsloth_kwargs)
except NotImplementedError:
logger.warning("Unsloth does not support model type {}.".format(getattr(config, "model_type", None)))
model = None
model_args.use_unsloth = False
return model
def get_unsloth_peft_model(
model: "PreTrainedModel", model_args: "ModelArguments", peft_kwargs: Dict[str, Any]
) -> "PreTrainedModel":
r"""
Gets the peft model for the pretrained model with unsloth. Used in training.
"""
from unsloth import FastLanguageModel
unsloth_peft_kwargs = {
"model": model,
"max_seq_length": model_args.model_max_length,
"use_gradient_checkpointing": "unsloth",
}
return FastLanguageModel.get_peft_model(**peft_kwargs, **unsloth_peft_kwargs)
def load_unsloth_peft_model(
config: "PretrainedConfig", model_args: "ModelArguments", is_trainable: bool
) -> "PreTrainedModel":
r"""
Loads peft model with unsloth. Used in both training and inference.
"""
from unsloth import FastLanguageModel
unsloth_kwargs = _get_unsloth_kwargs(config, model_args.adapter_name_or_path[0], model_args)
try:
if not is_trainable:
unsloth_kwargs["use_gradient_checkpointing"] = False
model, _ = FastLanguageModel.from_pretrained(**unsloth_kwargs)
except NotImplementedError:
raise ValueError("Unsloth does not support model type {}.".format(getattr(config, "model_type", None)))
if not is_trainable:
FastLanguageModel.for_inference(model)
return model
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