import json import re from threading import Lock from typing import Any, Callable, Generator, List, Optional import jieba import torch import torch.distributed as dist import torch.nn as nn from pydantic import BaseModel, Field try: from transformers.generation_logits_process import ( LogitsProcessorList, TemperatureLogitsWarper, TopKLogitsWarper, TopPLogitsWarper, ) except ImportError: from transformers.generation import LogitsProcessorList, TemperatureLogitsWarper, TopKLogitsWarper, TopPLogitsWarper def prepare_logits_processor(top_k: Optional[int] = None, top_p: Optional[float] = None, temperature: Optional[float] = None) -> LogitsProcessorList: processor_list = LogitsProcessorList() if temperature is not None and temperature != 1.0: processor_list.append(TemperatureLogitsWarper(temperature)) if top_k is not None and top_k != 0: processor_list.append(TopKLogitsWarper(top_k)) if top_p is not None and top_p < 1.0: processor_list.append(TopPLogitsWarper(top_p)) return processor_list def _is_sequence_finished(unfinished_sequences: torch.Tensor) -> bool: if dist.is_initialized() and dist.get_world_size() > 1: # consider DP unfinished_sequences = unfinished_sequences.clone() dist.all_reduce(unfinished_sequences) return unfinished_sequences.max() == 0 def sample_streamingly(model: nn.Module, input_ids: torch.Tensor, max_generate_tokens: int, early_stopping: bool = False, eos_token_id: Optional[int] = None, pad_token_id: Optional[int] = None, top_k: Optional[int] = None, top_p: Optional[float] = None, temperature: Optional[float] = None, prepare_inputs_fn: Optional[Callable[[torch.Tensor, Any], dict]] = None, update_model_kwargs_fn: Optional[Callable[[dict, Any], dict]] = None, **model_kwargs) -> Generator: logits_processor = prepare_logits_processor(top_k, top_p, temperature) unfinished_sequences = input_ids.new(input_ids.shape[0]).fill_(1) for _ in range(max_generate_tokens): model_inputs = prepare_inputs_fn(input_ids, **model_kwargs) if prepare_inputs_fn is not None else { 'input_ids': input_ids } outputs = model(**model_inputs) next_token_logits = outputs['logits'][:, -1, :] # pre-process distribution next_token_logits = logits_processor(input_ids, next_token_logits) # sample probs = torch.softmax(next_token_logits, dim=-1, dtype=torch.float) next_tokens = torch.multinomial(probs, num_samples=1).squeeze(1) # finished sentences should have their next token be a padding token if eos_token_id is not None: if pad_token_id is None: raise ValueError("If `eos_token_id` is defined, make sure that `pad_token_id` is defined.") next_tokens = next_tokens * unfinished_sequences + pad_token_id * (1 - unfinished_sequences) yield next_tokens # update generated ids, model inputs for next step input_ids = torch.cat([input_ids, next_tokens[:, None]], dim=-1) if update_model_kwargs_fn is not None: model_kwargs = update_model_kwargs_fn(outputs, **model_kwargs) # if eos_token was found in one sentence, set sentence to finished if eos_token_id is not None: unfinished_sequences = unfinished_sequences.mul((next_tokens != eos_token_id).long()) # stop when each sentence is finished if early_stopping=True if early_stopping and _is_sequence_finished(unfinished_sequences): break def update_model_kwargs_fn(outputs: dict, **model_kwargs) -> dict: if "past_key_values" in outputs: model_kwargs["past"] = outputs["past_key_values"] else: model_kwargs["past"] = None # update token_type_ids with last value if "token_type_ids" in model_kwargs: token_type_ids = model_kwargs["token_type_ids"] model_kwargs["token_type_ids"] = torch.cat([token_type_ids, token_type_ids[:, -1].unsqueeze(-1)], dim=-1) # update attention mask if "attention_mask" in model_kwargs: attention_mask = model_kwargs["attention_mask"] model_kwargs["attention_mask"] = torch.cat( [attention_mask, attention_mask.new_ones((attention_mask.shape[0], 1))], dim=-1) return model_kwargs class Dialogue(BaseModel): instruction: str = Field(min_length=1, example='Count up from 1 to 500.') response: str = Field(example='') def _format_dialogue(instruction: str, response: str = ''): return f'\n\n### Instruction:\n{instruction}\n\n### Response:\n{response}' STOP_PAT = re.compile(r'(###|instruction:).*', flags=(re.I | re.S)) class ChatPromptProcessor: SAFE_RESPONSE = 'The input/response contains inappropriate content, please rephrase your prompt.' def __init__(self, tokenizer, context: str, max_len: int = 2048, censored_words: List[str] = []): self.tokenizer = tokenizer self.context = context self.max_len = max_len self.censored_words = set([word.lower() for word in censored_words]) # These will be initialized after the first call of preprocess_prompt() self.context_len: Optional[int] = None self.dialogue_placeholder_len: Optional[int] = None def preprocess_prompt(self, history: List[Dialogue], max_new_tokens: int) -> str: if self.context_len is None: self.context_len = len(self.tokenizer(self.context)['input_ids']) if self.dialogue_placeholder_len is None: self.dialogue_placeholder_len = len( self.tokenizer(_format_dialogue(''), add_special_tokens=False)['input_ids']) prompt = self.context # the last dialogue must be in the prompt last_dialogue = history.pop() # the response of the last dialogue is empty assert last_dialogue.response == '' if len(self.tokenizer(_format_dialogue(last_dialogue.instruction), add_special_tokens=False) ['input_ids']) + max_new_tokens + self.context_len >= self.max_len: # to avoid truncate placeholder, apply truncate to the original instruction instruction_truncated = self.tokenizer(last_dialogue.instruction, add_special_tokens=False, truncation=True, max_length=(self.max_len - max_new_tokens - self.context_len - self.dialogue_placeholder_len))['input_ids'] instruction_truncated = self.tokenizer.decode(instruction_truncated).lstrip() prompt += _format_dialogue(instruction_truncated) return prompt res_len = self.max_len - max_new_tokens - len(self.tokenizer(prompt)['input_ids']) rows = [] for dialogue in history[::-1]: text = _format_dialogue(dialogue.instruction, dialogue.response) cur_len = len(self.tokenizer(text, add_special_tokens=False)['input_ids']) if res_len - cur_len < 0: break res_len -= cur_len rows.insert(0, text) prompt += ''.join(rows) + _format_dialogue(last_dialogue.instruction) return prompt def postprocess_output(self, output: str) -> str: output = STOP_PAT.sub('', output) return output.strip() def has_censored_words(self, text: str) -> bool: if len(self.censored_words) == 0: return False intersection = set(jieba.cut(text.lower())) & self.censored_words return len(intersection) > 0 class LockedIterator: def __init__(self, it, lock: Lock) -> None: self.lock = lock self.it = iter(it) def __iter__(self): return self def __next__(self): with self.lock: return next(self.it) def load_json(path: str): with open(path) as f: return json.load(f)