from transformers import AutoTokenizer, AutoModelForCausalLM, AutoConfig, BitsAndBytesConfig import torch from llava.model import LlavaMistralForCausalLM from llava.constants import DEFAULT_IMAGE_PATCH_TOKEN, DEFAULT_IM_START_TOKEN, DEFAULT_IM_END_TOKEN def load_pretrained_model(model_path, model_base, model_name, load_8bit=False, load_4bit=False, device_map="auto", device="cuda"): kwargs = {} if device != "cuda": kwargs['device_map'] = {"": device} if load_8bit: kwargs['load_in_8bit'] = True elif load_4bit: kwargs['load_in_4bit'] = True kwargs['quantization_config'] = BitsAndBytesConfig( load_in_4bit=True, bnb_4bit_compute_dtype=torch.float16, bnb_4bit_use_double_quant=True, bnb_4bit_quant_type='nf4' ) else: kwargs['torch_dtype'] = torch.float16 if 'llava' in model_name.lower(): # Load LLaVA model if 'mistral' in model_name.lower(): tokenizer = AutoTokenizer.from_pretrained(model_path) model = LlavaMistralForCausalLM.from_pretrained( model_path, low_cpu_mem_usage=False, use_flash_attention_2=False, **kwargs ) else: # Load language model if model_base is not None: # PEFT model from peft import PeftModel tokenizer = AutoTokenizer.from_pretrained(model_base, use_fast=False) model = AutoModelForCausalLM.from_pretrained(model_base, low_cpu_mem_usage=True, **kwargs) print(f"Loading LoRA weights from {model_path}") model = PeftModel.from_pretrained(model, model_path) print(f"Merging weights") model = model.merge_and_unload() print('Convert to FP16...') model.to(torch.float16) else: use_fast = False if 'mpt' in model_name.lower(): tokenizer = AutoTokenizer.from_pretrained(model_path, use_fast=True) model = AutoModelForCausalLM.from_pretrained(model_path, low_cpu_mem_usage=True, trust_remote_code=True, **kwargs) else: tokenizer = AutoTokenizer.from_pretrained(model_path, use_fast=False) model = AutoModelForCausalLM.from_pretrained(model_path, low_cpu_mem_usage=True, **kwargs) image_processor = None if 'llava' in model_name.lower(): # or 'mistral' in model_name.lower(): mm_use_im_start_end = getattr(model.config, "mm_use_im_start_end", False) mm_use_im_patch_token = getattr(model.config, "mm_use_im_patch_token", True) if mm_use_im_patch_token: tokenizer.add_tokens([DEFAULT_IMAGE_PATCH_TOKEN], special_tokens=True) if mm_use_im_start_end: tokenizer.add_tokens([DEFAULT_IM_START_TOKEN, DEFAULT_IM_END_TOKEN], special_tokens=True) model.resize_token_embeddings(len(tokenizer)) vision_tower = model.get_vision_tower() if not vision_tower.is_loaded: vision_tower.load_model() vision_tower.to(device=device, dtype=torch.float16) model.model.mm_projector.to(device=device, dtype=torch.float16) model.to(device=device, dtype=torch.float16) image_processor = vision_tower.image_processor if hasattr(model.config, "max_sequence_length"): context_len = model.config.max_sequence_length else: context_len = 2048 return tokenizer, model, image_processor, context_len