在 main() 函数的stream循环中，我们可以计算每秒钟生成的token数量，然后输出 it/s。在流式生成过程中，我们可以使用Python的time模块来计算速度。在测试时，生成速度会受到多个因素的影响，包括设备性能、模型大小、输入文本长度等。

import os
import torch
import platform
from colorama import Fore, Style
from transformers import AutoModelForCausalLM, AutoTokenizer
from transformers.generation.utils import GenerationConfig
import timedef init_model():print("init model ...")model = AutoModelForCausalLM.from_pretrained("baichuan-inc/Baichuan-13B-Chat",torch_dtype=torch.float16,device_map="cuda",trust_remote_code=True)model.generation_config = GenerationConfig.from_pretrained("baichuan-inc/Baichuan-13B-Chat")tokenizer = AutoTokenizer.from_pretrained("baichuan-inc/Baichuan-13B-Chat",use_fast=False,trust_remote_code=True)return model, tokenizerdef clear_screen():if platform.system() == "Windows":os.system("cls")else:os.system("clear")print(Fore.YELLOW + Style.BRIGHT + "欢迎使用百川大模型，输入进行对话，clear 清空历史，CTRL+C 中断生成，stream 开关流式生成，exit 结束。")return []def main(stream=True):model, tokenizer = init_model()messages = clear_screen()while True:prompt = input(Fore.GREEN + Style.BRIGHT + "\n用户：" + Style.NORMAL)if prompt.strip() == "exit":breakif prompt.strip() == "clear":messages = clear_screen()continueprint(Fore.CYAN + Style.BRIGHT + "\nBaichuan：" + Style.NORMAL, end='')if prompt.strip() == "stream":stream = not streamprint(Fore.YELLOW + "({}流式生成)\n".format("开启" if stream else "关闭"), end='')continuemessages.append({"role": "user", "content": prompt})if stream:position = 0try:start_time = time.time()total_tokens = 0for response in model.chat(tokenizer, messages, stream=True):print(response[position:], end='', flush=True)position = len(response)total_tokens += len(tokenizer(response, return_tensors='pt')['input_ids'][0])if torch.backends.mps.is_available():torch.mps.empty_cache()end_time = time.time()elapsed_time = end_time - start_timetokens_per_second = total_tokens / elapsed_timeprint(f"\n\n生成速度：{tokens_per_second:.2f} tokens/s")except KeyboardInterrupt:passprint()else:response = model.chat(tokenizer, messages)print(response)if torch.backends.mps.is_available():torch.mps.empty_cache()messages.append({"role": "assistant", "content": response})print(Style.RESET_ALL)if __name__ == "__main__":main()