from pathlib import Path import torch from peft import PeftModel from transformers import is_torch_xpu_available import modules.shared as shared from modules.logging_colors import logger from modules.models import reload_model def add_lora_to_model(lora_names): if 'GPTQForCausalLM' in shared.model.__class__.__name__ or shared.args.loader == 'AutoGPTQ': add_lora_autogptq(lora_names) elif shared.model.__class__.__name__ in ['Exllamav2Model', 'Exllamav2HF'] or shared.args.loader in ['ExLlamav2', 'ExLlamav2_HF']: add_lora_exllamav2(lora_names) else: add_lora_transformers(lora_names) def get_lora_path(lora_name): p = Path(lora_name) if p.exists(): lora_name = p.parts[-1] return Path(f"{shared.args.lora_dir}/{lora_name}") def add_lora_exllamav2(lora_names): from exllamav2 import ExLlamaV2Lora if isinstance(shared.model.loras, list): for lora in shared.model.loras: lora.unload() if len(lora_names) > 0: logger.info("Applying the following LoRAs to {}: {}".format(shared.model_name, ', '.join(lora_names))) shared.model.loras = [] for lora_name in lora_names: lora_path = get_lora_path(lora_name) if shared.model.__class__.__name__ == 'Exllamav2Model': lora = ExLlamaV2Lora.from_directory(shared.model.model, str(lora_path)) else: lora = ExLlamaV2Lora.from_directory(shared.model.ex_model, str(lora_path)) shared.model.loras.append(lora) shared.lora_names = lora_names else: shared.lora_names = [] shared.model.loras = None def add_lora_autogptq(lora_names): ''' Adapted from https://github.com/Ph0rk0z/text-generation-webui-testing ''' try: from auto_gptq import get_gptq_peft_model from auto_gptq.utils.peft_utils import GPTQLoraConfig except: logger.error("This version of AutoGPTQ does not support LoRA. You need to install from source or wait for a new release.") return if len(lora_names) == 0: reload_model() shared.lora_names = [] return else: if len(lora_names) > 1: logger.warning('AutoGPTQ can only work with 1 LoRA at the moment. Only the first one in the list will be loaded.') peft_config = GPTQLoraConfig( inference_mode=True, ) lora_path = get_lora_path(lora_names[0]) logger.info("Applying the following LoRAs to {}: {}".format(shared.model_name, ', '.join([lora_names[0]]))) shared.model = get_gptq_peft_model(shared.model, peft_config, lora_path) shared.lora_names = [lora_names[0]] return def add_lora_transformers(lora_names): prior_set = set(shared.lora_names) added_set = set(lora_names) - prior_set removed_set = prior_set - set(lora_names) # If no LoRA needs to be added or removed, exit if len(added_set) == 0 and len(removed_set) == 0: return # Add a LoRA when another LoRA is already present if len(removed_set) == 0 and len(prior_set) > 0 and "__merged" not in shared.model.peft_config.keys(): logger.info(f"Adding the LoRA(s) named {added_set} to the model") for lora in added_set: shared.model.load_adapter(get_lora_path(lora), lora) if len(lora_names) > 1: merge_loras() shared.lora_names = lora_names return # If any LoRA needs to be removed, start over if len(removed_set) > 0: shared.model = shared.model.unload() if len(lora_names) > 0: params = {} if not shared.args.cpu: if shared.args.load_in_4bit or shared.args.load_in_8bit: params['peft_type'] = shared.model.dtype else: params['dtype'] = shared.model.dtype if hasattr(shared.model, "hf_device_map"): params['device_map'] = {"base_model.model." + k: v for k, v in shared.model.hf_device_map.items()} logger.info("Applying the following LoRAs to {}: {}".format(shared.model_name, ', '.join(lora_names))) shared.model = PeftModel.from_pretrained(shared.model, get_lora_path(lora_names[0]), adapter_name=lora_names[0], **params) for lora in lora_names[1:]: shared.model.load_adapter(get_lora_path(lora), lora) if len(lora_names) > 1: merge_loras() if not shared.args.load_in_8bit and not shared.args.cpu: shared.model.half() if not hasattr(shared.model, "hf_device_map"): if torch.backends.mps.is_available(): device = torch.device('mps') shared.model = shared.model.to(device) elif is_torch_xpu_available(): device = torch.device("xpu:0") shared.model = shared.model.to(device) else: shared.model = shared.model.cuda() shared.lora_names = lora_names def merge_loras(): if len(list({shared.model.peft_config[adapter].r for adapter in shared.model.peft_config.keys()})) > 1: logger.warning("The loaded LoRAs cannot be merged, as they have dissimilar ranks. Only the first one will be active.") return shared.model.add_weighted_adapter(shared.lora_names, [1] * len(shared.lora_names), "__merged") shared.model.set_adapter("__merged")