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| import random | |
| import traceback | |
| from pathlib import Path | |
| import torch | |
| from exllamav2 import ( | |
| ExLlamaV2, | |
| ExLlamaV2Cache, | |
| ExLlamaV2Cache_8bit, | |
| ExLlamaV2Config, | |
| ExLlamaV2Tokenizer | |
| ) | |
| from exllamav2.generator import ExLlamaV2BaseGenerator, ExLlamaV2Sampler | |
| from modules import shared | |
| from modules.logging_colors import logger | |
| from modules.text_generation import get_max_prompt_length | |
| try: | |
| import flash_attn | |
| except ModuleNotFoundError: | |
| logger.warning( | |
| 'You are running ExLlamaV2 without flash-attention. This will cause the VRAM usage ' | |
| 'to be a lot higher than it could be.\n' | |
| 'Try installing flash-attention following the instructions here: ' | |
| 'https://github.com/Dao-AILab/flash-attention#installation-and-features' | |
| ) | |
| pass | |
| except Exception: | |
| logger.warning('Failed to load flash-attention due to the following error:\n') | |
| traceback.print_exc() | |
| class Exllamav2Model: | |
| def __init__(self): | |
| pass | |
| def from_pretrained(self, path_to_model): | |
| path_to_model = Path(f'{shared.args.model_dir}') / Path(path_to_model) | |
| config = ExLlamaV2Config() | |
| config.model_dir = str(path_to_model) | |
| config.prepare() | |
| config.max_seq_len = shared.args.max_seq_len | |
| config.scale_pos_emb = shared.args.compress_pos_emb | |
| config.scale_alpha_value = shared.args.alpha_value | |
| config.no_flash_attn = shared.args.no_flash_attn | |
| model = ExLlamaV2(config) | |
| split = None | |
| if shared.args.gpu_split: | |
| split = [float(alloc) for alloc in shared.args.gpu_split.split(",")] | |
| model.load(split) | |
| tokenizer = ExLlamaV2Tokenizer(config) | |
| if shared.args.cache_8bit: | |
| cache = ExLlamaV2Cache_8bit(model) | |
| else: | |
| cache = ExLlamaV2Cache(model) | |
| generator = ExLlamaV2BaseGenerator(model, cache, tokenizer) | |
| result = self() | |
| result.model = model | |
| result.cache = cache | |
| result.tokenizer = tokenizer | |
| result.generator = generator | |
| result.loras = None | |
| return result, result | |
| def encode(self, string, **kwargs): | |
| return self.tokenizer.encode(string, add_bos=True, encode_special_tokens=True) | |
| def decode(self, ids, **kwargs): | |
| if isinstance(ids, list): | |
| ids = torch.tensor([ids]) | |
| elif isinstance(ids, torch.Tensor) and ids.numel() == 1: | |
| ids = ids.view(1, -1) | |
| return self.tokenizer.decode(ids, decode_special_tokens=True)[0] | |
| def get_logits(self, token_ids, **kwargs): | |
| self.cache.current_seq_len = 0 | |
| if token_ids.shape[-1] > 1: | |
| self.model.forward(token_ids[:, :-1], self.cache, input_mask=None, preprocess_only=True, loras=self.loras) | |
| return self.model.forward(token_ids[:, -1:], self.cache, input_mask=None, loras=self.loras, **kwargs).float().cpu() | |
| def generate_with_streaming(self, prompt, state): | |
| settings = ExLlamaV2Sampler.Settings() | |
| settings.temperature = state['temperature'] | |
| settings.top_k = state['top_k'] | |
| settings.top_p = state['top_p'] | |
| settings.min_p = state['min_p'] | |
| settings.tfs = state['tfs'] | |
| settings.typical = state['typical_p'] | |
| settings.mirostat = state['mirostat_mode'] == 2 | |
| settings.mirostat_tau = state['mirostat_tau'] | |
| settings.mirostat_eta = state['mirostat_eta'] | |
| settings.token_repetition_penalty = state['repetition_penalty'] | |
| settings.token_repetition_range = -1 if state['repetition_penalty_range'] <= 0 else state['repetition_penalty_range'] | |
| if state['ban_eos_token']: | |
| settings.disallow_tokens(self.tokenizer, [self.tokenizer.eos_token_id]) | |
| if state['custom_token_bans']: | |
| to_ban = [int(x) for x in state['custom_token_bans'].split(',')] | |
| if len(to_ban) > 0: | |
| settings.disallow_tokens(self.tokenizer, to_ban) | |
| ids = self.tokenizer.encode(prompt, add_bos=state['add_bos_token'], encode_special_tokens=True) | |
| ids = ids[:, -get_max_prompt_length(state):] | |
| initial_len = ids.shape[-1] | |
| if state['auto_max_new_tokens']: | |
| max_new_tokens = state['truncation_length'] - ids.shape[-1] | |
| else: | |
| max_new_tokens = state['max_new_tokens'] | |
| # _gen_begin_base | |
| self.cache.current_seq_len = 0 | |
| self.model.forward(ids[:, :-1], self.cache, input_mask=None, preprocess_only=True, loras=self.loras) | |
| has_leading_space = False | |
| for i in range(max_new_tokens): | |
| logits = self.model.forward(ids[:, -1:], self.cache, input_mask=None, loras=self.loras).float().cpu() | |
| token, _, _ = ExLlamaV2Sampler.sample(logits, settings, ids, random.random(), self.tokenizer) | |
| ids = torch.cat([ids, token], dim=1) | |
| if i == 0 and self.tokenizer.tokenizer.id_to_piece(int(token)).startswith('▁'): | |
| has_leading_space = True | |
| decoded_text = self.tokenizer.decode(ids[:, initial_len:], decode_special_tokens=not state['skip_special_tokens'])[0] | |
| if has_leading_space: | |
| decoded_text = ' ' + decoded_text | |
| # Check the partial unicode character | |
| if chr(0xfffd) in decoded_text: | |
| is_last = i == max_new_tokens - 1 | |
| is_stopping = token.item() == self.tokenizer.eos_token_id or shared.stop_everything | |
| # If we are not at the end of the generation, we skip this token | |
| if not (is_last or is_stopping): | |
| continue | |
| if token.item() == self.tokenizer.eos_token_id or shared.stop_everything: | |
| break | |
| yield decoded_text | |
| def generate(self, prompt, state): | |
| output = '' | |
| for output in self.generate_with_streaming(prompt, state): | |
| pass | |
| return output | |