mirror of
https://github.com/oobabooga/text-generation-webui.git
synced 2024-11-23 16:38:21 +01:00
107 lines
4.3 KiB
Python
107 lines
4.3 KiB
Python
import os
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from pathlib import Path
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from typing import Any, Dict, Optional, Union
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import torch
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from torch.nn import CrossEntropyLoss
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from transformers import GenerationConfig, PretrainedConfig, PreTrainedModel
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from transformers.modeling_outputs import CausalLMOutputWithPast
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from modules import shared
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from modules.logging_colors import logger
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try:
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from exllama.model import ExLlama, ExLlamaCache, ExLlamaConfig
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except:
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logger.warning('Exllama module failed to load. Will attempt to load from repositories.')
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try:
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from modules.relative_imports import RelativeImport
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with RelativeImport("repositories/exllama"):
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from model import ExLlama, ExLlamaCache, ExLlamaConfig
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except:
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logger.error("Could not find repositories/exllama/. Make sure that exllama is cloned inside repositories/ and is up to date.")
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raise
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class ExllamaHF(PreTrainedModel):
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def __init__(self, config: ExLlamaConfig):
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super().__init__(PretrainedConfig())
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self.ex_config = config
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self.ex_model = ExLlama(self.ex_config)
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self.generation_config = GenerationConfig()
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self.lora = None
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def _validate_model_class(self):
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pass
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def _validate_model_kwargs(self, model_kwargs: Dict[str, Any]):
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pass
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def prepare_inputs_for_generation(self, input_ids, **kwargs):
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return {'input_ids': input_ids, **kwargs}
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@property
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def device(self) -> torch.device:
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return torch.device(0)
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def __call__(self, *args, **kwargs):
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# TODO: Some decoding methods (such as Contrastive Search) may not work at this time
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assert len(args) == 0, 'no *args should be passed to forward'
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use_cache = kwargs.get('use_cache', True)
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labels = kwargs.get('labels', None)
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seq = kwargs['input_ids'][0].tolist()
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cache = kwargs['past_key_values'] if 'past_key_values' in kwargs else None
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if cache is None:
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cache = ExLlamaCache(self.ex_model)
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self.ex_model.forward(torch.tensor([seq[:-1]], dtype=torch.long), cache, preprocess_only=True, lora=self.lora)
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logits = self.ex_model.forward(torch.tensor([seq[-1:]], dtype=torch.long), cache, lora=self.lora).to(kwargs['input_ids'].device)
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loss = None
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if labels is not None:
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# Shift so that tokens < n predict n
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shift_logits = logits[..., :-1, :].contiguous()
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shift_labels = labels[..., 1:].contiguous()
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# Flatten the tokens
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loss_fct = CrossEntropyLoss()
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shift_logits = shift_logits.view(-1, logits.shape[-1])
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shift_labels = shift_labels.view(-1)
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# Enable model parallelism
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shift_labels = shift_labels.to(shift_logits.device)
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loss = loss_fct(shift_logits, shift_labels)
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return CausalLMOutputWithPast(logits=logits, past_key_values=cache if use_cache else None)
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@classmethod
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def from_pretrained(cls, pretrained_model_name_or_path: Optional[Union[str, os.PathLike]], *model_args, **kwargs):
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assert len(model_args) == 0 and len(kwargs) == 0, "extra args is currently not supported"
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if isinstance(pretrained_model_name_or_path, str):
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pretrained_model_name_or_path = Path(pretrained_model_name_or_path)
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pretrained_model_name_or_path = Path(f'{shared.args.model_dir}') / Path(pretrained_model_name_or_path)
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config = ExLlamaConfig(pretrained_model_name_or_path / 'config.json')
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# from 'oobabooga/text-generation-webui/modules/exllama.py'
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weight_path = None
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for ext in ['.safetensors', '.pt', '.bin']:
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found = list(pretrained_model_name_or_path.glob(f"*{ext}"))
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if len(found) > 0:
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weight_path = found[-1]
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break
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assert weight_path is not None, f'could not find weight in "{pretrained_model_name_or_path}"'
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config.model_path = str(weight_path)
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config.max_seq_len = shared.args.max_seq_len
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config.compress_pos_emb = shared.args.compress_pos_emb
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if shared.args.gpu_split:
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config.set_auto_map(shared.args.gpu_split)
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config.gpu_peer_fix = True
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# This slowes down a bit but align better with autogptq generation.
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# TODO: Should give user choice to tune the exllama config
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# config.fused_attn = False
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# config.fused_mlp_thd = 0
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return ExllamaHF(config)
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