Function update_fsdp_plugin_peft

src/transformers/integrations/fsdp.py:73–92

Updates the FSDP plugin for PEFT LoRA/QLoRA compatibility. When using FSDP with PEFT LoRA, the auto wrap policy needs to be updated to additionally wrap LoRA trainable layers separately. When using FSDP with QLoRA, the mixed precision policy needs to be updated to use the quantizat

(model, accelerator)

def update_fsdp_plugin_peft(model, accelerator):
    """
    Updates the FSDP plugin for PEFT LoRA/QLoRA compatibility.

    When using FSDP with PEFT LoRA, the auto wrap policy needs to be updated to additionally wrap
    LoRA trainable layers separately. When using FSDP with QLoRA, the mixed precision policy needs
    to be updated to use the quantization storage data type.
    """
    from peft import PeftConfig
    from peft.utils.other import fsdp_auto_wrap_policy

    if isinstance(model.active_peft_config, PeftConfig):
        accelerator.state.fsdp_plugin.auto_wrap_policy = fsdp_auto_wrap_policy(model)
    if (
        getattr(model, "quantization_method", None) == QuantizationMethod.BITS_AND_BYTES
        and model.hf_quantizer.quantization_config.bnb_4bit_quant_storage.is_floating_point
    ):
        accelerator.state.fsdp_plugin.set_mixed_precision(
            model.hf_quantizer.quantization_config.bnb_4bit_quant_storage, override=True
        )