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| import os | |
| from pathlib import Path | |
| from typing import Any, Dict, Optional, Union | |
| import torch | |
| from torch.nn import CrossEntropyLoss | |
| from transformers import GenerationConfig, PretrainedConfig, PreTrainedModel | |
| from transformers.modeling_outputs import CausalLMOutputWithPast | |
| from modules import RoPE, shared | |
| from modules.logging_colors import logger | |
| try: | |
| import llama_cpp | |
| except: | |
| llama_cpp = None | |
| try: | |
| import llama_cpp_cuda | |
| except: | |
| llama_cpp_cuda = None | |
| def llama_cpp_lib(): | |
| if (shared.args.cpu and llama_cpp is not None) or llama_cpp_cuda is None: | |
| return llama_cpp | |
| else: | |
| return llama_cpp_cuda | |
| class LlamacppHF(PreTrainedModel): | |
| def __init__(self, model, path): | |
| super().__init__(PretrainedConfig()) | |
| self.model = model | |
| self.generation_config = GenerationConfig() | |
| self.past_seq = None | |
| self.llamacpp_cache = { | |
| 'n_tokens': self.model.n_tokens, | |
| 'input_ids': self.model.input_ids, | |
| 'scores': self.model.scores, | |
| 'ctx': self.model.ctx | |
| } | |
| if shared.args.cfg_cache: | |
| self.past_seq_negative = None | |
| self.llamacpp_cache_negative = { | |
| 'n_tokens': self.model.n_tokens, | |
| 'input_ids': self.model.input_ids.copy(), | |
| 'scores': self.model.scores.copy(), | |
| 'ctx': llama_cpp_lib().llama_new_context_with_model(model.model, model.context_params) | |
| } | |
| def _validate_model_class(self): | |
| pass | |
| def _validate_model_kwargs(self, model_kwargs: Dict[str, Any]): | |
| pass | |
| def prepare_inputs_for_generation(self, input_ids, **kwargs): | |
| return {'input_ids': input_ids, **kwargs} | |
| def save_cache(self): | |
| self.llamacpp_cache.update({ | |
| 'n_tokens': self.model.n_tokens, | |
| 'input_ids': self.model.input_ids, | |
| 'scores': self.model.scores, | |
| 'ctx': self.model.ctx | |
| }) | |
| def save_negative_cache(self): | |
| self.llamacpp_cache_negative.update({ | |
| 'n_tokens': self.model.n_tokens, | |
| 'input_ids': self.model.input_ids, | |
| 'scores': self.model.scores, | |
| 'ctx': self.model.ctx | |
| }) | |
| def load_cache(self): | |
| self.model.n_tokens = self.llamacpp_cache['n_tokens'] | |
| self.model.input_ids = self.llamacpp_cache['input_ids'] | |
| self.model.scores = self.llamacpp_cache['scores'] | |
| self.model.ctx = self.llamacpp_cache['ctx'] | |
| def load_negative_cache(self): | |
| self.model.n_tokens = self.llamacpp_cache_negative['n_tokens'] | |
| self.model.input_ids = self.llamacpp_cache_negative['input_ids'] | |
| self.model.scores = self.llamacpp_cache_negative['scores'] | |
| self.model.ctx = self.llamacpp_cache_negative['ctx'] | |
| def device(self) -> torch.device: | |
| return torch.device(0) | |
| def __call__(self, *args, **kwargs): | |
| use_cache = kwargs.get('use_cache', True) | |
| labels = kwargs.get('labels', None) | |
| past_key_values = kwargs.get('past_key_values', None) | |
| if len(args) > 0: | |
| if not shared.args.cfg_cache: | |
| logger.error("Please enable the cfg-cache option to use CFG with llamacpp_HF.") | |
| return | |
| input_ids = args[0] | |
| is_negative = True | |
| past_seq = self.past_seq_negative | |
| self.load_negative_cache() | |
| else: | |
| input_ids = kwargs['input_ids'] | |
| is_negative = False | |
| past_seq = self.past_seq | |
| self.load_cache() | |
| seq = input_ids[0].tolist() | |
| if is_negative and past_key_values is not None: | |
| seq = past_key_values + seq | |
| seq_tensor = torch.tensor(seq) | |
| reset = True | |
| # Make the forward call. The prefix-match code has been adapted from | |
| # https://github.com/abetlen/llama-cpp-python/commit/f4090a0bb2a2a25acfe28d31c82cc1aa273bedee | |
| if labels is None: | |
| if past_seq is not None: | |
| min_length = min(past_seq.shape[0], seq_tensor.shape[0]) | |
| indices = torch.nonzero(~torch.eq(past_seq[:min_length], seq_tensor[:min_length])) | |
| if len(indices) > 0: | |
| longest_prefix = indices[0].item() | |
| else: | |
| longest_prefix = min_length | |
| if longest_prefix > 0: | |
| reset = False | |
| self.model.n_tokens = longest_prefix | |
| if len(seq_tensor) - longest_prefix > 0: | |
| self.model.eval(seq[longest_prefix:]) | |
| if reset: | |
| self.model.reset() | |
| self.model.eval(seq) | |
| logits = torch.tensor(self.model.scores[self.model.n_tokens - 1, :]).view(1, 1, -1).to(input_ids.device) | |
| else: | |
| self.model.reset() | |
| self.model.eval(seq) | |
| logits = torch.tensor(self.model.eval_logits) | |
| logits = logits.view(1, logits.shape[0], logits.shape[1]).to(input_ids.device) | |
| if is_negative: | |
| self.save_negative_cache() | |
| self.past_seq_negative = seq_tensor | |
| else: | |
| self.save_cache() | |
| self.past_seq = seq_tensor | |
| loss = None | |
| if labels is not None: | |
| # Shift so that tokens < n predict n | |
| shift_logits = logits[..., :-1, :].contiguous() | |
| shift_labels = labels[..., 1:].contiguous() | |
| # Flatten the tokens | |
| loss_fct = CrossEntropyLoss() | |
| shift_logits = shift_logits.view(-1, logits.shape[-1]) | |
| shift_labels = shift_labels.view(-1) | |
| # Enable model parallelism | |
| shift_labels = shift_labels.to(shift_logits.device) | |
| loss = loss_fct(shift_logits, shift_labels) | |
| return CausalLMOutputWithPast(logits=logits, past_key_values=seq if use_cache else None, loss=loss) | |
| def from_pretrained(cls, pretrained_model_name_or_path: Optional[Union[str, os.PathLike]], *model_args, **kwargs): | |
| assert len(model_args) == 0 and len(kwargs) == 0, "extra args is currently not supported" | |
| if isinstance(pretrained_model_name_or_path, str): | |
| pretrained_model_name_or_path = Path(pretrained_model_name_or_path) | |
| path = Path(f'{shared.args.model_dir}') / Path(pretrained_model_name_or_path) | |
| if path.is_file(): | |
| model_file = path | |
| else: | |
| model_file = list(path.glob('*.gguf'))[0] | |
| logger.info(f"llama.cpp weights detected: {model_file}\n") | |
| if shared.args.tensor_split is None or shared.args.tensor_split.strip() == '': | |
| tensor_split_list = None | |
| else: | |
| tensor_split_list = [float(x) for x in shared.args.tensor_split.strip().split(",")] | |
| params = { | |
| 'model_path': str(model_file), | |
| 'n_ctx': shared.args.n_ctx, | |
| 'seed': int(shared.args.llama_cpp_seed), | |
| 'n_threads': shared.args.threads or None, | |
| 'n_threads_batch': shared.args.threads_batch or None, | |
| 'n_batch': shared.args.n_batch, | |
| 'use_mmap': not shared.args.no_mmap, | |
| 'use_mlock': shared.args.mlock, | |
| 'mul_mat_q': shared.args.mul_mat_q, | |
| 'numa': shared.args.numa, | |
| 'n_gpu_layers': shared.args.n_gpu_layers, | |
| 'rope_freq_base': RoPE.get_rope_freq_base(shared.args.alpha_value, shared.args.rope_freq_base), | |
| 'tensor_split': tensor_split_list, | |
| 'rope_freq_scale': 1.0 / shared.args.compress_pos_emb, | |
| 'logits_all': True, | |
| } | |
| Llama = llama_cpp_lib().Llama | |
| model = Llama(**params) | |
| return LlamacppHF(model, model_file) | |