import warnings import re from contextlib import contextmanager from dataclasses import asdict from enum import Enum from typing import List, Optional import torch from peft import get_peft_model, PeftConfig, PeftModel, PeftType from peft.peft_model import PEFT_TYPE_TO_MODEL_MAPPING from peft.tuners.lora import LoraConfig, LoraLayer, LoraModel, Embedding from peft.tuners.adalora import AdaLoraConfig, AdaLoraLayer, AdaLoraModel from peft.mapping import PEFT_TYPE_TO_CONFIG_MAPPING from peft.utils.other import _get_submodules from ..modeling._base import BaseGPTQForCausalLM class GPTQLoraConfig(LoraConfig): injected_fused_attention: bool = False injected_fused_mlp: bool = False class GPTQLoraLinear(torch.nn.Linear, LoraLayer): def __init__( self, adapter_name: str, linear_module: torch.nn.Linear, r: int = 0, lora_alpha: int = 1, lora_dropout: float = 0.0, fan_in_fan_out: bool = False, # Set this to True if the layer to replace stores weight like (fan_in, fan_out) **kwargs, ): init_lora_weights = kwargs.pop("init_lora_weights", True) torch.nn.Linear.__init__(self, linear_module.in_features, linear_module.out_features) LoraLayer.__init__(self, linear_module.in_features, linear_module.out_features) self.linear_module = linear_module self.weight.requires_grad = False self.weight = self.linear_module.weight self.bias = self.linear_module.bias self.fan_in_fan_out = fan_in_fan_out if fan_in_fan_out: self.weight.data = self.weight.data.T self.update_layer(adapter_name, r, lora_alpha, lora_dropout, init_lora_weights) self.active_adapter = adapter_name def reset_lora_parameters(self, adapter_name): if adapter_name in self.lora_A.keys(): torch.nn.init.xavier_uniform_(self.lora_A[adapter_name].weight) torch.nn.init.zeros_(self.lora_B[adapter_name].weight) def merge(self): raise NotImplementedError("gptq model not support merge lora adapter") def unmerge(self): raise NotImplementedError("gptq model not support unmerge lora adapter") def forward(self, x: torch.Tensor): previous_dtype = x.dtype if self.active_adapter not in self.lora_A.keys(): return self.linear_module(x) if self.disable_adapters: if self.r[self.active_adapter] > 0 and self.merged: self.unmerge() result = self.linear_module(x) elif self.r[self.active_adapter] > 0 and not self.merged: result = self.linear_module(x) lora_B = self.lora_B[self.active_adapter] lora_A = self.lora_A[self.active_adapter] lora_dropout = self.lora_dropout[self.active_adapter] scale = self.scaling[self.active_adapter] x = x.type_as(lora_A.weight.data) adapter_result = (lora_B(lora_A(lora_dropout(x))) * scale).type_as(result) result += adapter_result else: result = self.linear_module(x) result = result.to(previous_dtype) return result class GPTQLoraModel(LoraModel): def _find_and_replace(self, adapter_name): lora_config = self.peft_config[adapter_name] is_target_modules_in_base_model = False kwargs = { "r": lora_config.r, "lora_alpha": lora_config.lora_alpha, "lora_dropout": lora_config.lora_dropout, "fan_in_fan_out": lora_config.fan_in_fan_out, "init_lora_weights": lora_config.init_lora_weights, } key_list = [key for key, _ in self.model.named_modules()] for key in key_list: if isinstance(lora_config.target_modules, str): target_module_found = re.fullmatch(lora_config.target_modules, key) else: target_module_found = any(key.endswith(target_key) for target_key in lora_config.target_modules) if target_module_found: if not is_target_modules_in_base_model: is_target_modules_in_base_model = True parent, target, target_name = _get_submodules(self.model, key) bias = False if hasattr(target, "bias"): bias = target.bias is not None if isinstance(target, LoraLayer): target.update_layer( adapter_name, lora_config.r, lora_config.lora_alpha, lora_config.lora_dropout, lora_config.init_lora_weights, ) else: if isinstance(target, torch.nn.Embedding): embedding_kwargs = kwargs.copy() embedding_kwargs.pop("fan_in_fan_out", None) in_features, out_features = target.num_embeddings, target.embedding_dim new_module = Embedding(adapter_name, in_features, out_features, **embedding_kwargs) else: if isinstance(target, torch.nn.Linear): if kwargs["fan_in_fan_out"]: warnings.warn( "fan_in_fan_out is set to True but the target module is `torch.nn.Linear`. " "Setting fan_in_fan_out to False." ) kwargs["fan_in_fan_out"] = lora_config.fan_in_fan_out = False else: raise ValueError( f"Target module {target} is not supported. " f"Currently, only `torch.nn.Linear` and its subclasses are supported." ) new_module = GPTQLoraLinear(adapter_name, target, **kwargs) self._replace_module(parent, target_name, new_module, target) if not is_target_modules_in_base_model: raise ValueError( f"Target modules {lora_config.target_modules} not found in the base model. " f"Please check the target modules and try again." ) def _replace_module(self, parent_module, child_name, new_module, old_module): setattr(parent_module, child_name, new_module) if not isinstance(new_module, GPTQLoraLinear): new_module.weight = old_module.weight if hasattr(old_module, "bias"): if old_module.bias is not None: new_module.bias = old_module.bias if getattr(old_module, "state", None) is not None: new_module.state = old_module.state new_module.to(old_module.weight.device) # dispatch to correct device for name, module in new_module.named_modules(): if "lora_" in name: module.to(old_module.weight.device) def merge_adapter(self): raise NotImplementedError("gptq model not support merge ada lora adapter") def unmerge_adapter(self): raise NotImplementedError("gptq model not support unmerge ada lora adapter") def merge_and_unload(self): raise NotImplementedError("gptq model not support merge and unload") class GPTQAdaLoraConfig(AdaLoraConfig): injected_fused_attention: bool = False injected_fused_mlp: bool = False class GPTQSVDLinear(torch.nn.Linear, AdaLoraLayer): def __init__( self, adapter_name: str, linear_module: torch.nn.Linear, r: int = 0, lora_alpha: int = 1, lora_dropout: float = 0.0, fan_in_fan_out: bool = False, # Set this to True if the layer to replace stores weight like (fan_in, fan_out) **kwargs, ): init_lora_weights = kwargs.pop("init_lora_weights", True) torch.nn.Linear.__init__(self, linear_module.in_features, linear_module.out_features) AdaLoraLayer.__init__(self, linear_module.in_features, linear_module.out_features) self.linear_module = linear_module self.weight.requires_grad = False self.weight = self.linear_module.weight self.bias = self.linear_module.bias self.fan_in_fan_out = fan_in_fan_out if fan_in_fan_out: self.weight.data = self.weight.data.T self.update_layer(adapter_name, r, lora_alpha, lora_dropout, init_lora_weights) self.active_adapter = adapter_name def merge(self): raise NotImplementedError("gptq model not support merge lora adapter") def unmerge(self): raise NotImplementedError("gptq model not support unmerge lora adapter") def forward(self, x: torch.Tensor): if self.active_adapter not in self.lora_A.keys(): return self.linear_module(x) if self.disable_adapters: if self.r[self.active_adapter] > 0 and self.merged: self.unmerge() result = self.linear_module(x) elif self.r[self.active_adapter] > 0 and not self.merged: result = self.linear_module(x) result += ( ( self.lora_dropout[self.active_adapter](x) @ (self.lora_A[self.active_adapter] * self.lora_E[self.active_adapter]).T @ self.lora_B[self.active_adapter].T ) * self.scaling[self.active_adapter] / (self.ranknum[self.active_adapter] + 1e-5) ) else: result = self.linear_module(x) return result class GPTQAdaLoraModel(AdaLoraModel): def _find_and_replace(self, adapter_name): lora_config = self.peft_config[adapter_name] is_target_modules_in_base_model = False kwargs = { "r": lora_config.init_r, "lora_alpha": lora_config.lora_alpha, "lora_dropout": lora_config.lora_dropout, "fan_in_fan_out": lora_config.fan_in_fan_out, "init_lora_weights": lora_config.init_lora_weights, } key_list = [key for key, _ in self.model.named_modules()] for key in key_list: if isinstance(lora_config.target_modules, str): target_module_found = re.fullmatch(lora_config.target_modules, key) else: target_module_found = any(key.endswith(target_key) for target_key in lora_config.target_modules) if target_module_found: if not is_target_modules_in_base_model: is_target_modules_in_base_model = True parent, target, target_name = _get_submodules(self.model, key) bias = target.bias is not None if isinstance(target, LoraLayer): target.update_layer( adapter_name, lora_config.init_r, lora_config.lora_alpha, lora_config.lora_dropout, lora_config.init_lora_weights, ) else: if isinstance(target, torch.nn.Linear): in_features, out_features = target.in_features, target.out_features if kwargs["fan_in_fan_out"]: warnings.warn( "fan_in_fan_out is set to True but the target module is `torch.nn.Linear`. " "Setting fan_in_fan_out to False." ) kwargs["fan_in_fan_out"] = lora_config.fan_in_fan_out = False else: raise ValueError( f"Target module {target} is not supported. " f"Currently, only `torch.nn.Linear` and its subclasses are supported." ) new_module = GPTQSVDLinear(adapter_name, target, **kwargs) self._replace_module(parent, target_name, new_module, target) if not is_target_modules_in_base_model: raise ValueError( f"Target modules {lora_config.target_modules} not found in the base model. " f"Please check the target modules and try again." ) def _replace_module(self, parent_module, child_name, new_module, old_module): setattr(parent_module, child_name, new_module) # dispatch to correct device for name, module in new_module.named_modules(): if "lora_" in name: module.to(old_module.weight.device) def merge_adapter(self): raise NotImplementedError("gptq model not support merge ada lora adapter") def unmerge_adapter(self): raise NotImplementedError("gptq model not support unmerge ada lora adapter") def merge_and_unload(self): raise NotImplementedError("gptq model not support merge and unload") def find_all_linear_names(model: BaseGPTQForCausalLM, ignore: Optional[List[str]] = None, ignore_lm_head: bool = True): if not ignore: ignore = [] lm_head_name = model.lm_head_name if ignore_lm_head and lm_head_name not in ignore: ignore.append(lm_head_name) results = set() for n, m in model.named_modules(): if isinstance(m, torch.nn.Linear): res = n.split('.')[-1] if res not in ignore: results.add(res) return list(results) @contextmanager def hijack_peft_mappings(): PEFT_TYPE_TO_CONFIG_MAPPING[PeftType.LORA] = GPTQLoraConfig PEFT_TYPE_TO_MODEL_MAPPING[PeftType.LORA] = GPTQLoraModel PEFT_TYPE_TO_CONFIG_MAPPING[PeftType.ADALORA] = GPTQAdaLoraConfig PEFT_TYPE_TO_MODEL_MAPPING[PeftType.ADALORA] = GPTQAdaLoraModel try: yield except: PEFT_TYPE_TO_CONFIG_MAPPING[PeftType.LORA] = GPTQLoraConfig PEFT_TYPE_TO_MODEL_MAPPING[PeftType.LORA] = GPTQLoraModel PEFT_TYPE_TO_CONFIG_MAPPING[PeftType.ADALORA] = GPTQAdaLoraConfig PEFT_TYPE_TO_MODEL_MAPPING[PeftType.ADALORA] = GPTQAdaLoraModel raise finally: PEFT_TYPE_TO_CONFIG_MAPPING[PeftType.LORA] = GPTQLoraConfig PEFT_TYPE_TO_MODEL_MAPPING[PeftType.LORA] = GPTQLoraModel PEFT_TYPE_TO_CONFIG_MAPPING[PeftType.ADALORA] = GPTQAdaLoraConfig PEFT_TYPE_TO_MODEL_MAPPING[PeftType.ADALORA] = GPTQAdaLoraModel def get_gptq_peft_model( model: BaseGPTQForCausalLM, peft_config: PeftConfig = None, model_id: str = None, adapter_name: str = "default", auto_find_all_linears: bool = True, train_mode: bool = False ): if train_mode and not model.trainable: model.enable_trainable_mode() if train_mode and not peft_config: raise ValueError("peft_config not specified when in train mode.") if not train_mode and not model_id: raise ValueError("model_id(where to load adapters) not specified when in inference mode.") if model.fused_attn_module_type is not None and not model.injected_fused_attention: peft_types = [PeftType.LORA.value, PeftType.ADALORA.value] warnings.warn( f"You can just ignore this warning if the peft type you use isn't in {peft_types}.\n" f"{model.__class__.__name__} supports injecting fused attention but not enables this time. " "If you are training adapters, you must also disable fused attention injection when loading quantized " "base model at inference time, otherwise adapters may not be added to base model properly. " "If you are loading adapters to do inference, you can reference to adapter's config file to check " "whether the adapters are trained using base model that not enable fused attention injection." ) if model.injected_fused_mlp: raise NotImplementedError("GPTQ model that enables fused mlp injection is not supported to integrate with peft.") if train_mode: peft_type = peft_config.peft_type if not isinstance(peft_type, str): peft_type = peft_type.value if peft_type in [PeftType.LORA.value, PeftType.ADALORA.value]: if auto_find_all_linears: peft_config.target_modules = find_all_linear_names(model, ignore_lm_head=True) if peft_type == PeftType.LORA.value and not isinstance(peft_config, GPTQLoraConfig): peft_config = GPTQLoraConfig(**peft_config.to_dict()) if peft_type == PeftType.ADALORA.value and not isinstance(peft_config, GPTQAdaLoraConfig): peft_config = GPTQAdaLoraConfig(**peft_config.to_dict()) peft_config.injected_fused_attention = model.injected_fused_attention peft_config.injected_fused_mlp = model.injected_fused_mlp if peft_type == PeftType.ADAPTION_PROMPT.value: if peft_config.adapter_layers > model.config.num_hidden_layers: warnings.warn( f"model has only {model.config.num_hidden_layers} layers " f"but adapter_layers is set to {peft_config.adapter_layers}, " f"will reset value to {model.config.num_hidden_layers}." ) peft_config.adapter_layers = model.config.num_hidden_layers if model.injected_fused_attention: raise NotImplementedError( "model with fused attention injected isn't supported to use ADAPTION_PROMPT peft type yet." ) with hijack_peft_mappings(): try: if train_mode: peft_model = get_peft_model(model.model, peft_config, adapter_name=adapter_name) else: peft_model = PeftModel.from_pretrained(model.model, model_id, adapter_name) except: raise NotImplementedError( f"{model.__class__.__name__} not support {peft_config.peft_type.value} peft type yet." ) return peft_model __all__ = [ "GPTQLoraConfig", "GPTQLoraModel", "GPTQAdaLoraConfig", "GPTQAdaLoraModel", "find_all_linear_names", "get_gptq_peft_model" ]