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| import inspect | |
| import re | |
| from pathlib import Path | |
| import accelerate | |
| import torch | |
| import transformers | |
| from transformers import AutoConfig, AutoModelForCausalLM | |
| import modules.shared as shared | |
| from modules.logging_colors import logger | |
| from gptq_for_llama import llama_inference_offload | |
| from gptq_for_llama.modelutils import find_layers | |
| from gptq_for_llama.quant import make_quant | |
| # This function is a replacement for the load_quant function in the | |
| # GPTQ-for_LLaMa repository. It supports more models and branches. | |
| def _load_quant(model, checkpoint, wbits, groupsize=-1, faster_kernel=False, exclude_layers=None, kernel_switch_threshold=128, eval=True): | |
| exclude_layers = exclude_layers or ['lm_head'] | |
| def noop(*args, **kwargs): | |
| pass | |
| config = AutoConfig.from_pretrained(model, trust_remote_code=shared.args.trust_remote_code) | |
| torch.nn.init.kaiming_uniform_ = noop | |
| torch.nn.init.uniform_ = noop | |
| torch.nn.init.normal_ = noop | |
| torch.set_default_dtype(torch.half) | |
| transformers.modeling_utils._init_weights = False | |
| torch.set_default_dtype(torch.half) | |
| model = AutoModelForCausalLM.from_config(config, trust_remote_code=shared.args.trust_remote_code) | |
| torch.set_default_dtype(torch.float) | |
| if eval: | |
| model = model.eval() | |
| layers = find_layers(model) | |
| for name in exclude_layers: | |
| if name in layers: | |
| del layers[name] | |
| gptq_args = inspect.getfullargspec(make_quant).args | |
| make_quant_kwargs = { | |
| 'module': model, | |
| 'names': layers, | |
| 'bits': wbits, | |
| } | |
| if 'groupsize' in gptq_args: | |
| make_quant_kwargs['groupsize'] = groupsize | |
| if 'faster' in gptq_args: | |
| make_quant_kwargs['faster'] = faster_kernel | |
| if 'kernel_switch_threshold' in gptq_args: | |
| make_quant_kwargs['kernel_switch_threshold'] = kernel_switch_threshold | |
| make_quant(**make_quant_kwargs) | |
| del layers | |
| if checkpoint.endswith('.safetensors'): | |
| from safetensors.torch import load_file as safe_load | |
| model.load_state_dict(safe_load(checkpoint), strict=False) | |
| else: | |
| model.load_state_dict(torch.load(checkpoint), strict=False) | |
| model.seqlen = 2048 | |
| return model | |
| # Used to locate the .pt/.safetensors quantized file | |
| def find_quantized_model_file(model_name): | |
| if shared.args.checkpoint: | |
| return Path(shared.args.checkpoint) | |
| path_to_model = Path(f'{shared.args.model_dir}/{model_name}') | |
| pt_path = None | |
| priority_name_list = [ | |
| Path(f'{shared.args.model_dir}/{model_name}{hyphen}{shared.args.wbits}bit{group}{ext}') | |
| for group in ([f'-{shared.args.groupsize}g', ''] if shared.args.groupsize > 0 else ['']) | |
| for ext in ['.safetensors', '.pt'] | |
| for hyphen in ['-', f'/{model_name}-', '/'] | |
| ] | |
| for path in priority_name_list: | |
| if path.exists(): | |
| pt_path = path | |
| break | |
| # If the model hasn't been found with a well-behaved name, pick the last .pt | |
| # or the last .safetensors found in its folder as a last resort | |
| if not pt_path: | |
| for ext in ['.pt', '.safetensors']: | |
| found = list(path_to_model.glob(f"*{ext}")) | |
| if len(found) > 0: | |
| if len(found) > 1: | |
| logger.warning(f'More than one {ext} model has been found. The last one will be selected. It could be wrong.') | |
| pt_path = found[-1] | |
| break | |
| return pt_path | |
| # The function that loads the model in modules/models.py | |
| def load_quantized(model_name): | |
| if shared.args.model_type is None: | |
| logger.error("The model could not be loaded because its type could not be inferred from its name.") | |
| logger.error("Please specify the type manually using the --model_type argument.") | |
| return None | |
| # Select the appropriate load_quant function | |
| model_type = shared.args.model_type.lower() | |
| if shared.args.pre_layer and model_type == 'llama': | |
| load_quant = llama_inference_offload.load_quant | |
| elif model_type in ('llama', 'opt', 'gptj'): | |
| if shared.args.pre_layer: | |
| logger.warning("Ignoring --pre_layer because it only works for llama model type.") | |
| load_quant = _load_quant | |
| else: | |
| logger.error("Unknown pre-quantized model type specified. Only 'llama', 'opt' and 'gptj' are supported") | |
| exit() | |
| # Find the quantized model weights file (.pt/.safetensors) | |
| path_to_model = Path(f'{shared.args.model_dir}/{model_name}') | |
| pt_path = find_quantized_model_file(model_name) | |
| if not pt_path: | |
| logger.error("Could not find the quantized model in .pt or .safetensors format, exiting...") | |
| exit() | |
| else: | |
| logger.info(f"Found the following quantized model: {pt_path}") | |
| # qwopqwop200's offload | |
| if model_type == 'llama' and shared.args.pre_layer: | |
| if len(shared.args.pre_layer) == 1: | |
| pre_layer = shared.args.pre_layer[0] | |
| else: | |
| pre_layer = shared.args.pre_layer | |
| model = load_quant(str(path_to_model), str(pt_path), shared.args.wbits, shared.args.groupsize, pre_layer) | |
| else: | |
| threshold = False if model_type == 'gptj' else 128 | |
| model = load_quant(str(path_to_model), str(pt_path), shared.args.wbits, shared.args.groupsize, kernel_switch_threshold=threshold) | |
| # accelerate offload (doesn't work properly) | |
| if shared.args.gpu_memory or torch.cuda.device_count() > 1: | |
| if shared.args.gpu_memory: | |
| memory_map = list(map(lambda x: x.strip(), shared.args.gpu_memory)) | |
| max_cpu_memory = shared.args.cpu_memory.strip() if shared.args.cpu_memory is not None else '99GiB' | |
| max_memory = {} | |
| for i in range(len(memory_map)): | |
| max_memory[i] = f'{memory_map[i]}GiB' if not re.match('.*ib$', memory_map[i].lower()) else memory_map[i] | |
| max_memory['cpu'] = f'{max_cpu_memory}GiB' if not re.match('.*ib$', max_cpu_memory.lower()) else max_cpu_memory | |
| else: | |
| max_memory = accelerate.utils.get_balanced_memory(model) | |
| device_map = accelerate.infer_auto_device_map(model, max_memory=max_memory, no_split_module_classes=["LlamaDecoderLayer"]) | |
| logger.info("Using the following device map for the quantized model:", device_map) | |
| # https://huggingface.co/docs/accelerate/package_reference/big_modeling#accelerate.dispatch_model | |
| model = accelerate.dispatch_model(model, device_map=device_map, offload_buffers=True) | |
| # No offload | |
| elif not shared.args.cpu: | |
| model = model.to(torch.device('cuda:0')) | |
| return model | |