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| from pathlib import Path | |
| import torch | |
| import torch.nn.functional as F | |
| from torch import version as torch_version | |
| from modules import shared | |
| from modules.logging_colors import logger | |
| from modules.models import clear_torch_cache | |
| from modules.text_generation import get_max_prompt_length | |
| try: | |
| from exllama.generator import ExLlamaGenerator | |
| from exllama.model import ExLlama, ExLlamaCache, ExLlamaConfig | |
| from exllama.tokenizer import ExLlamaTokenizer | |
| except: | |
| logger.warning('Exllama module failed to load. Will attempt to load from repositories.') | |
| try: | |
| from modules.relative_imports import RelativeImport | |
| with RelativeImport("repositories/exllama"): | |
| from generator import ExLlamaGenerator | |
| from model import ExLlama, ExLlamaCache, ExLlamaConfig | |
| from tokenizer import ExLlamaTokenizer | |
| except: | |
| logger.error("Could not find repositories/exllama/. Make sure that exllama is cloned inside repositories/ and is up to date.") | |
| raise | |
| class ExllamaModel: | |
| def __init__(self): | |
| pass | |
| def from_pretrained(self, path_to_model): | |
| path_to_model = Path(f'{shared.args.model_dir}') / Path(path_to_model) | |
| tokenizer_model_path = path_to_model / "tokenizer.model" | |
| model_config_path = path_to_model / "config.json" | |
| # Find the model checkpoint | |
| model_path = None | |
| for ext in ['.safetensors', '.pt', '.bin']: | |
| 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.') | |
| model_path = found[-1] | |
| break | |
| config = ExLlamaConfig(str(model_config_path)) | |
| config.model_path = str(model_path) | |
| config.max_seq_len = shared.args.max_seq_len | |
| config.compress_pos_emb = shared.args.compress_pos_emb | |
| if shared.args.gpu_split: | |
| config.set_auto_map(shared.args.gpu_split) | |
| config.gpu_peer_fix = True | |
| if shared.args.alpha_value > 1 and shared.args.rope_freq_base == 0: | |
| config.alpha_value = shared.args.alpha_value | |
| config.calculate_rotary_embedding_base() | |
| elif shared.args.rope_freq_base > 0: | |
| config.rotary_embedding_base = shared.args.rope_freq_base | |
| if torch_version.hip: | |
| config.rmsnorm_no_half2 = True | |
| config.rope_no_half2 = True | |
| config.matmul_no_half2 = True | |
| config.silu_no_half2 = True | |
| model = ExLlama(config) | |
| tokenizer = ExLlamaTokenizer(str(tokenizer_model_path)) | |
| cache = ExLlamaCache(model) | |
| generator = ExLlamaGenerator(model, tokenizer, cache) | |
| result = self() | |
| result.config = config | |
| result.model = model | |
| result.cache = cache | |
| result.tokenizer = tokenizer | |
| result.generator = generator | |
| return result, result | |
| def generate_with_streaming(self, prompt, state): | |
| # The cache batch size must be 2 for CFG and 1 otherwise | |
| if state['guidance_scale'] == 1: | |
| if self.cache.batch_size == 2: | |
| del self.cache | |
| clear_torch_cache() | |
| self.cache = ExLlamaCache(self.model) | |
| self.generator = ExLlamaGenerator(self.model, self.tokenizer, self.cache) | |
| else: | |
| if self.cache.batch_size == 1: | |
| del self.cache | |
| clear_torch_cache() | |
| self.cache = ExLlamaCache(self.model, batch_size=2) | |
| self.generator = ExLlamaGenerator(self.model, self.tokenizer, self.cache) | |
| self.generator.settings.temperature = state['temperature'] | |
| self.generator.settings.top_p = state['top_p'] | |
| self.generator.settings.top_k = state['top_k'] | |
| self.generator.settings.typical = state['typical_p'] | |
| self.generator.settings.token_repetition_penalty_max = state['repetition_penalty'] | |
| self.generator.settings.token_repetition_penalty_sustain = -1 if state['repetition_penalty_range'] <= 0 else state['repetition_penalty_range'] | |
| if state['ban_eos_token']: | |
| self.generator.disallow_tokens([self.tokenizer.eos_token_id]) | |
| else: | |
| self.generator.disallow_tokens(None) | |
| if state['custom_token_bans']: | |
| to_ban = [int(x) for x in state['custom_token_bans'].split(',')] | |
| if len(to_ban) > 0: | |
| self.generator.disallow_tokens(to_ban) | |
| # Case 1: no CFG | |
| if state['guidance_scale'] == 1: | |
| self.generator.end_beam_search() | |
| # Tokenizing the input | |
| ids = self.generator.tokenizer.encode(prompt, max_seq_len=self.model.config.max_seq_len) | |
| if state['add_bos_token']: | |
| ids = torch.cat( | |
| [torch.tensor([[self.tokenizer.bos_token_id]]).to(ids.device), | |
| ids], dim=1 | |
| ).to(torch.int64) | |
| ids = ids[:, -get_max_prompt_length(state):] | |
| if state['auto_max_new_tokens']: | |
| max_new_tokens = state['truncation_length'] - ids.shape[-1] | |
| else: | |
| max_new_tokens = state['max_new_tokens'] | |
| self.generator.gen_begin_reuse(ids) | |
| initial_len = self.generator.sequence[0].shape[0] | |
| has_leading_space = False | |
| for i in range(max_new_tokens): | |
| token = self.generator.gen_single_token() | |
| if i == 0 and self.generator.tokenizer.tokenizer.IdToPiece(int(token)).startswith('▁'): | |
| has_leading_space = True | |
| decoded_text = self.generator.tokenizer.decode(self.generator.sequence[0][initial_len:]) | |
| if has_leading_space: | |
| decoded_text = ' ' + decoded_text | |
| yield decoded_text | |
| if token.item() == self.generator.tokenizer.eos_token_id or shared.stop_everything: | |
| break | |
| # Case 2: CFG | |
| # Copied from https://github.com/turboderp/exllama/blob/master/example_cfg.py | |
| else: | |
| alpha = state['guidance_scale'] | |
| prompts = [prompt, state['negative_prompt'] or ''] | |
| ids, mask = self.tokenizer.encode( | |
| prompts, | |
| return_mask=True, | |
| max_seq_len=self.model.config.max_seq_len, | |
| add_bos=state['add_bos_token'] | |
| ) | |
| if state['auto_max_new_tokens']: | |
| max_new_tokens = state['truncation_length'] - ids[0].shape[-1] | |
| else: | |
| max_new_tokens = state['max_new_tokens'] | |
| self.generator.gen_begin(ids, mask=mask) | |
| initial_len = self.generator.sequence[0].shape[0] | |
| has_leading_space = False | |
| for i in range(max_new_tokens): | |
| logits = self.model.forward(self.generator.sequence[:, -1:], self.cache, input_mask=mask) | |
| self.generator.apply_rep_penalty(logits) | |
| logits = F.log_softmax(logits, dim=-1) | |
| logits_mixed = alpha * logits[0] + (1 - alpha) * logits[1] | |
| token, _ = self.generator.sample_current(logits_mixed) | |
| if i == 0 and self.generator.tokenizer.tokenizer.IdToPiece(int(token)).startswith('▁'): | |
| has_leading_space = True | |
| decoded_text = self.generator.tokenizer.decode(self.generator.sequence[0][initial_len:]) | |
| if has_leading_space: | |
| decoded_text = ' ' + decoded_text | |
| yield decoded_text | |
| if token.item() == self.tokenizer.eos_token_id or shared.stop_everything: | |
| break | |
| batch_token = token.repeat(2, 1) | |
| self.generator.gen_accept_token(batch_token) | |
| def generate(self, prompt, state): | |
| output = '' | |
| for output in self.generate_with_streaming(prompt, state): | |
| pass | |
| return output | |
| def encode(self, string, **kwargs): | |
| return self.tokenizer.encode(string, max_seq_len=self.model.config.max_seq_len, add_bos=True) | |
| def decode(self, ids, **kwargs): | |
| if isinstance(ids, int): | |
| ids = torch.tensor([[ids]]) | |
| elif isinstance(ids, torch.Tensor) and ids.numel() == 1: | |
| ids = ids.view(1, -1) | |
| return self.tokenizer.decode(ids)[0] | |