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src/llmfactory/model/utils/unsloth.py

+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