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| import gc | |
| import os | |
| import re | |
| import time | |
| from pathlib import Path | |
| import hashlib | |
| import torch | |
| import transformers | |
| from accelerate import infer_auto_device_map, init_empty_weights | |
| from transformers import ( | |
| AutoConfig, | |
| AutoModel, | |
| AutoModelForCausalLM, | |
| AutoModelForSeq2SeqLM, | |
| AutoTokenizer, | |
| BitsAndBytesConfig, | |
| ) | |
| import modules.shared as shared | |
| from modules import llama_attn_hijack, sampler_hijack | |
| from modules.logging_colors import logger | |
| from modules.models_settings import infer_loader | |
| transformers.logging.set_verbosity_error() | |
| local_rank = None | |
| if shared.args.deepspeed: | |
| import deepspeed | |
| from transformers.deepspeed import ( | |
| HfDeepSpeedConfig, | |
| is_deepspeed_zero3_enabled | |
| ) | |
| from modules.deepspeed_parameters import generate_ds_config | |
| # Distributed setup | |
| local_rank = shared.args.local_rank if shared.args.local_rank is not None else int(os.getenv("LOCAL_RANK", "0")) | |
| world_size = int(os.getenv("WORLD_SIZE", "1")) | |
| torch.cuda.set_device(local_rank) | |
| deepspeed.init_distributed() | |
| ds_config = generate_ds_config(shared.args.bf16, 1 * world_size, shared.args.nvme_offload_dir) | |
| dschf = HfDeepSpeedConfig(ds_config) # Keep this object alive for the Transformers integration | |
| sampler_hijack.hijack_samplers() | |
| def load_model(model_name, loader=None): | |
| logger.info(f"Loading {model_name}...") | |
| t0 = time.time() | |
| shared.is_seq2seq = False | |
| load_func_map = { | |
| 'Transformers': huggingface_loader, | |
| 'AutoGPTQ': AutoGPTQ_loader, | |
| 'GPTQ-for-LLaMa': GPTQ_loader, | |
| 'llama.cpp': llamacpp_loader, | |
| 'llamacpp_HF': llamacpp_HF_loader, | |
| 'RWKV': RWKV_loader, | |
| 'ExLlama': ExLlama_loader, | |
| 'ExLlama_HF': ExLlama_HF_loader | |
| } | |
| p = Path(model_name) | |
| if p.exists(): | |
| model_name = p.parts[-1] | |
| if loader is None: | |
| if shared.args.loader is not None: | |
| loader = shared.args.loader | |
| else: | |
| loader = infer_loader(model_name) | |
| if loader is None: | |
| logger.error('The path to the model does not exist. Exiting.') | |
| return None, None | |
| shared.args.loader = loader | |
| output = load_func_map[loader](model_name) | |
| if type(output) is tuple: | |
| model, tokenizer = output | |
| else: | |
| model = output | |
| if model is None: | |
| return None, None | |
| else: | |
| tokenizer = load_tokenizer(model_name, model) | |
| # Hijack attention with xformers | |
| if any((shared.args.xformers, shared.args.sdp_attention)): | |
| llama_attn_hijack.hijack_llama_attention() | |
| logger.info(f"Loaded the model in {(time.time()-t0):.2f} seconds.\n") | |
| return model, tokenizer | |
| def load_tokenizer(model_name, model): | |
| tokenizer = None | |
| path_to_model = Path(f"{shared.args.model_dir}/{model_name}/") | |
| if any(s in model_name.lower() for s in ['gpt-4chan', 'gpt4chan']) and Path(f"{shared.args.model_dir}/gpt-j-6B/").exists(): | |
| tokenizer = AutoTokenizer.from_pretrained(Path(f"{shared.args.model_dir}/gpt-j-6B/")) | |
| elif path_to_model.exists(): | |
| try: | |
| tokenizer = AutoTokenizer.from_pretrained( | |
| path_to_model, | |
| trust_remote_code=shared.args.trust_remote_code, | |
| use_fast=False | |
| ) | |
| except ValueError: | |
| tokenizer = AutoTokenizer.from_pretrained( | |
| path_to_model, | |
| trust_remote_code=shared.args.trust_remote_code, | |
| use_fast=True | |
| ) | |
| if tokenizer.__class__.__name__ == 'LlamaTokenizer': | |
| pairs = [ | |
| ['tokenizer_config.json', '516c6167c884793a738c440e29ccb80c15e1493ffc965affc69a1a8ddef4572a'], | |
| ['special_tokens_map.json', 'ff3b4a612c4e447acb02d40071bddd989fe0da87eb5b7fe0dbadfc4f74de7531'] | |
| ] | |
| for pair in pairs: | |
| p = path_to_model / pair[0] | |
| if p.exists(): | |
| with open(p, "rb") as f: | |
| bytes = f.read() | |
| file_hash = hashlib.sha256(bytes).hexdigest() | |
| if file_hash != pair[1]: | |
| logger.warning(f"{p} is different from the original LlamaTokenizer file. It is either customized or outdated.") | |
| return tokenizer | |
| def huggingface_loader(model_name): | |
| path_to_model = Path(f'{shared.args.model_dir}/{model_name}') | |
| if 'chatglm' in model_name.lower(): | |
| LoaderClass = AutoModel | |
| else: | |
| config = AutoConfig.from_pretrained(path_to_model, trust_remote_code=shared.args.trust_remote_code) | |
| if config.to_dict().get("is_encoder_decoder", False): | |
| LoaderClass = AutoModelForSeq2SeqLM | |
| shared.is_seq2seq = True | |
| else: | |
| LoaderClass = AutoModelForCausalLM | |
| # Load the model in simple 16-bit mode by default | |
| if not any([shared.args.cpu, shared.args.load_in_8bit, shared.args.load_in_4bit, shared.args.auto_devices, shared.args.disk, shared.args.deepspeed, shared.args.gpu_memory is not None, shared.args.cpu_memory is not None]): | |
| model = LoaderClass.from_pretrained(Path(f"{shared.args.model_dir}/{model_name}"), low_cpu_mem_usage=True, torch_dtype=torch.bfloat16 if shared.args.bf16 else torch.float16, trust_remote_code=shared.args.trust_remote_code) | |
| if torch.backends.mps.is_available(): | |
| device = torch.device('mps') | |
| model = model.to(device) | |
| else: | |
| model = model.cuda() | |
| # DeepSpeed ZeRO-3 | |
| elif shared.args.deepspeed: | |
| model = LoaderClass.from_pretrained(Path(f"{shared.args.model_dir}/{model_name}"), torch_dtype=torch.bfloat16 if shared.args.bf16 else torch.float16) | |
| model = deepspeed.initialize(model=model, config_params=ds_config, model_parameters=None, optimizer=None, lr_scheduler=None)[0] | |
| model.module.eval() # Inference | |
| logger.info(f"DeepSpeed ZeRO-3 is enabled: {is_deepspeed_zero3_enabled()}") | |
| # Custom | |
| else: | |
| params = { | |
| "low_cpu_mem_usage": True, | |
| "trust_remote_code": shared.args.trust_remote_code | |
| } | |
| if not any((shared.args.cpu, torch.cuda.is_available(), torch.backends.mps.is_available())): | |
| logger.warning("torch.cuda.is_available() returned False. This means that no GPU has been detected. Falling back to CPU mode.") | |
| shared.args.cpu = True | |
| if shared.args.cpu: | |
| params["torch_dtype"] = torch.float32 | |
| else: | |
| params["device_map"] = 'auto' | |
| if shared.args.load_in_4bit: | |
| # See https://github.com/huggingface/transformers/pull/23479/files | |
| # and https://huggingface.co/blog/4bit-transformers-bitsandbytes | |
| quantization_config_params = { | |
| 'load_in_4bit': True, | |
| 'bnb_4bit_compute_dtype': eval("torch.{}".format(shared.args.compute_dtype)) if shared.args.compute_dtype in ["bfloat16", "float16", "float32"] else None, | |
| 'bnb_4bit_quant_type': shared.args.quant_type, | |
| 'bnb_4bit_use_double_quant': shared.args.use_double_quant, | |
| } | |
| logger.warning("Using the following 4-bit params: " + str(quantization_config_params)) | |
| params['quantization_config'] = BitsAndBytesConfig(**quantization_config_params) | |
| elif shared.args.load_in_8bit and any((shared.args.auto_devices, shared.args.gpu_memory)): | |
| params['quantization_config'] = BitsAndBytesConfig(load_in_8bit=True, llm_int8_enable_fp32_cpu_offload=True) | |
| elif shared.args.load_in_8bit: | |
| params['quantization_config'] = BitsAndBytesConfig(load_in_8bit=True) | |
| elif shared.args.bf16: | |
| params["torch_dtype"] = torch.bfloat16 | |
| else: | |
| params["torch_dtype"] = torch.float16 | |
| params['max_memory'] = get_max_memory_dict() | |
| if shared.args.disk: | |
| params["offload_folder"] = shared.args.disk_cache_dir | |
| checkpoint = Path(f'{shared.args.model_dir}/{model_name}') | |
| if shared.args.load_in_8bit and params.get('max_memory', None) is not None and params['device_map'] == 'auto': | |
| config = AutoConfig.from_pretrained(checkpoint, trust_remote_code=shared.args.trust_remote_code) | |
| with init_empty_weights(): | |
| model = LoaderClass.from_config(config, trust_remote_code=shared.args.trust_remote_code) | |
| model.tie_weights() | |
| params['device_map'] = infer_auto_device_map( | |
| model, | |
| dtype=torch.int8, | |
| max_memory=params['max_memory'], | |
| no_split_module_classes=model._no_split_modules | |
| ) | |
| model = LoaderClass.from_pretrained(checkpoint, **params) | |
| return model | |
| def RWKV_loader(model_name): | |
| from modules.RWKV import RWKVModel, RWKVTokenizer | |
| model = RWKVModel.from_pretrained(Path(f'{shared.args.model_dir}/{model_name}'), dtype="fp32" if shared.args.cpu else "bf16" if shared.args.bf16 else "fp16", device="cpu" if shared.args.cpu else "cuda") | |
| tokenizer = RWKVTokenizer.from_pretrained(Path(shared.args.model_dir)) | |
| return model, tokenizer | |
| def llamacpp_loader(model_name): | |
| from modules.llamacpp_model import LlamaCppModel | |
| path = Path(f'{shared.args.model_dir}/{model_name}') | |
| if path.is_file(): | |
| model_file = path | |
| else: | |
| model_file = list(Path(f'{shared.args.model_dir}/{model_name}').glob('*ggml*.bin'))[0] | |
| logger.info(f"llama.cpp weights detected: {model_file}\n") | |
| model, tokenizer = LlamaCppModel.from_pretrained(model_file) | |
| return model, tokenizer | |
| def llamacpp_HF_loader(model_name): | |
| from modules.llamacpp_hf import LlamacppHF | |
| for fname in ["oobabooga_llama-tokenizer", "llama-tokenizer"]: | |
| path = Path(f'{shared.args.model_dir}/{fname}') | |
| if path.exists(): | |
| break | |
| else: | |
| logger.error("Could not load the model because a tokenizer in transformers format was not found. Please download oobabooga/llama-tokenizer.") | |
| return None, None | |
| tokenizer = AutoTokenizer.from_pretrained( | |
| path, | |
| trust_remote_code=shared.args.trust_remote_code, | |
| use_fast=False | |
| ) | |
| model = LlamacppHF.from_pretrained(model_name) | |
| return model, tokenizer | |
| def GPTQ_loader(model_name): | |
| # Monkey patch | |
| if shared.args.monkey_patch: | |
| logger.warning("Applying the monkey patch for using LoRAs with GPTQ models. It may cause undefined behavior outside its intended scope.") | |
| from modules.monkey_patch_gptq_lora import load_model_llama | |
| model, _ = load_model_llama(model_name) | |
| # No monkey patch | |
| else: | |
| import modules.GPTQ_loader | |
| model = modules.GPTQ_loader.load_quantized(model_name) | |
| return model | |
| def AutoGPTQ_loader(model_name): | |
| import modules.AutoGPTQ_loader | |
| return modules.AutoGPTQ_loader.load_quantized(model_name) | |
| def ExLlama_loader(model_name): | |
| from modules.exllama import ExllamaModel | |
| model, tokenizer = ExllamaModel.from_pretrained(model_name) | |
| return model, tokenizer | |
| def ExLlama_HF_loader(model_name): | |
| from modules.exllama_hf import ExllamaHF | |
| return ExllamaHF.from_pretrained(model_name) | |
| def get_max_memory_dict(): | |
| max_memory = {} | |
| if shared.args.gpu_memory: | |
| memory_map = list(map(lambda x: x.strip(), shared.args.gpu_memory)) | |
| for i in range(len(memory_map)): | |
| max_memory[i] = f'{memory_map[i]}GiB' if not re.match('.*ib$', memory_map[i].lower()) else memory_map[i] | |
| max_cpu_memory = shared.args.cpu_memory.strip() if shared.args.cpu_memory is not None else '99GiB' | |
| max_memory['cpu'] = f'{max_cpu_memory}GiB' if not re.match('.*ib$', max_cpu_memory.lower()) else max_cpu_memory | |
| # If --auto-devices is provided standalone, try to get a reasonable value | |
| # for the maximum memory of device :0 | |
| elif shared.args.auto_devices: | |
| total_mem = (torch.cuda.get_device_properties(0).total_memory / (1024 * 1024)) | |
| suggestion = round((total_mem - 1000) / 1000) * 1000 | |
| if total_mem - suggestion < 800: | |
| suggestion -= 1000 | |
| suggestion = int(round(suggestion / 1000)) | |
| logger.warning(f"Auto-assiging --gpu-memory {suggestion} for your GPU to try to prevent out-of-memory errors. You can manually set other values.") | |
| max_memory = {0: f'{suggestion}GiB', 'cpu': f'{shared.args.cpu_memory or 99}GiB'} | |
| return max_memory if len(max_memory) > 0 else None | |
| def clear_torch_cache(): | |
| gc.collect() | |
| if not shared.args.cpu: | |
| torch.cuda.empty_cache() | |
| def unload_model(): | |
| shared.model = shared.tokenizer = None | |
| shared.lora_names = [] | |
| shared.model_dirty_from_training = False | |
| clear_torch_cache() | |
| def reload_model(): | |
| unload_model() | |
| shared.model, shared.tokenizer = load_model(shared.model_name) | |