import json import re import requests from tclogger import logger from transformers import AutoTokenizer from constants.models import ( MODEL_MAP, STOP_SEQUENCES_MAP, TOKEN_LIMIT_MAP, TOKEN_RESERVED, ) from constants.envs import PROXIES from messagers.message_outputer import OpenaiStreamOutputer class HuggingfaceStreamer: def __init__(self, model: str): if model in MODEL_MAP.keys(): self.model = model else: self.model = "mixtral-8x7b" self.model_fullname = MODEL_MAP[self.model] self.message_outputer = OpenaiStreamOutputer(model=self.model) if self.model == "gemma-7b": # this is not wrong, as repo `google/gemma-7b-it` is gated and must authenticate to access it # so I use mistral-7b as a fallback self.tokenizer = AutoTokenizer.from_pretrained(MODEL_MAP["mistral-7b"]) else: self.tokenizer = AutoTokenizer.from_pretrained(self.model_fullname) def parse_line(self, line): line = line.decode("utf-8") line = re.sub(r"data:\s*", "", line) data = json.loads(line) try: content = data["token"]["text"] except: logger.err(data) return content def count_tokens(self, text): tokens = self.tokenizer.encode(text) token_count = len(tokens) logger.note(f"Prompt Token Count: {token_count}") return token_count def chat_response( self, prompt: str = None, temperature: float = 0.5, top_p: float = 0.95, max_new_tokens: int = None, api_key: str = None, use_cache: bool = False, ): # https://huggingface.co/docs/api-inference/detailed_parameters?code=curl # curl --proxy http://: https://api-inference.huggingface.co/models// -X POST -d '{"inputs":"who are you?","parameters":{"max_new_token":64}}' -H 'Content-Type: application/json' -H 'Authorization: Bearer ' self.request_url = ( f"https://api-inference.huggingface.co/models/{self.model_fullname}" ) self.request_headers = { "Content-Type": "application/json", } if api_key: logger.note( f"Using API Key: {api_key[:3]}{(len(api_key)-7)*'*'}{api_key[-4:]}" ) self.request_headers["Authorization"] = f"Bearer {api_key}" if temperature is None or temperature < 0: temperature = 0.0 # temperature must 0 < and < 1 for HF LLM models temperature = max(temperature, 0.01) temperature = min(temperature, 0.99) top_p = max(top_p, 0.01) top_p = min(top_p, 0.99) token_limit = int( TOKEN_LIMIT_MAP[self.model] - TOKEN_RESERVED - self.count_tokens(prompt) ) if token_limit <= 0: raise ValueError("Prompt exceeded token limit!") if max_new_tokens is None or max_new_tokens <= 0: max_new_tokens = token_limit else: max_new_tokens = min(max_new_tokens, token_limit) # References: # huggingface_hub/inference/_client.py: # class InferenceClient > def text_generation() # huggingface_hub/inference/_text_generation.py: # class TextGenerationRequest > param `stream` # https://huggingface.co/docs/text-generation-inference/conceptual/streaming#streaming-with-curl # https://huggingface.co/docs/api-inference/detailed_parameters#text-generation-task self.request_body = { "inputs": prompt, "parameters": { "temperature": temperature, "top_p": top_p, "max_new_tokens": max_new_tokens, "return_full_text": False, }, "options": { "use_cache": use_cache, }, "stream": True, } if self.model in STOP_SEQUENCES_MAP.keys(): self.stop_sequences = STOP_SEQUENCES_MAP[self.model] # self.request_body["parameters"]["stop_sequences"] = [ # self.STOP_SEQUENCES[self.model] # ] logger.back(self.request_url) stream_response = requests.post( self.request_url, headers=self.request_headers, json=self.request_body, proxies=PROXIES, stream=True, ) status_code = stream_response.status_code if status_code == 200: logger.success(status_code) else: logger.err(status_code) return stream_response def chat_return_dict(self, stream_response): # https://platform.openai.com/docs/guides/text-generation/chat-completions-response-format final_output = self.message_outputer.default_data.copy() final_output["choices"] = [ { "index": 0, "finish_reason": "stop", "message": { "role": "assistant", "content": "", }, } ] logger.back(final_output) final_content = "" for line in stream_response.iter_lines(): if not line: continue content = self.parse_line(line) if content.strip() == self.stop_sequences: logger.success("\n[Finished]") break else: logger.back(content, end="") final_content += content if self.model in STOP_SEQUENCES_MAP.keys(): final_content = final_content.replace(self.stop_sequences, "") final_content = final_content.strip() final_output["choices"][0]["message"]["content"] = final_content return final_output def chat_return_generator(self, stream_response): is_finished = False line_count = 0 for line in stream_response.iter_lines(): if line: line_count += 1 else: continue content = self.parse_line(line) if content.strip() == self.stop_sequences: content_type = "Finished" logger.success("\n[Finished]") is_finished = True else: content_type = "Completions" if line_count == 1: content = content.lstrip() logger.back(content, end="") output = self.message_outputer.output( content=content, content_type=content_type ) yield output if not is_finished: yield self.message_outputer.output(content="", content_type="Finished")