1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
| from fastapi import FastAPI, Request
from transformers import AutoTokenizer, AutoModelForCausalLM, GenerationConfig
import uvicorn
import json
import datetime
import torch
# 设置设备参数
DEVICE = "cuda" # 使用CUDA
DEVICE_ID = "0" # CUDA设备ID，如果未设置则为空
CUDA_DEVICE = f"{DEVICE}:{DEVICE_ID}" if DEVICE_ID else DEVICE # 组合CUDA设备信息
# 清理GPU内存函数
def torch_gc():
if torch.cuda.is_available(): # 检查是否可用CUDA
with torch.cuda.device(CUDA_DEVICE): # 指定CUDA设备
torch.cuda.empty_cache() # 清空CUDA缓存
torch.cuda.ipc_collect() # 收集CUDA内存碎片
# 构建 chat 模版
def bulid_input(prompt, history=[]):
system_format='<|start_header_id|>system<|end_header_id|>\n\n{content}<|eot_id|>'
user_format='<|start_header_id|>user<|end_header_id|>\n\n{content}<|eot_id|>'
assistant_format='<|start_header_id|>assistant<|end_header_id|>\n\n{content}<|eot_id|>\n'
history.append({'role':'user','content':prompt})
prompt_str = ''
# 拼接历史对话
for item in history:
if item['role']=='user':
prompt_str+=user_format.format(content=item['content'])
else:
prompt_str+=assistant_format.format(content=item['content'])
return prompt_str
# 创建FastAPI应用
app = FastAPI()
# 处理POST请求的端点
@app.post("/")
async def create_item(request: Request):
global model, tokenizer # 声明全局变量以便在函数内部使用模型和分词器
json_post_raw = await request.json() # 获取POST请求的JSON数据
json_post = json.dumps(json_post_raw) # 将JSON数据转换为字符串
json_post_list = json.loads(json_post) # 将字符串转换为Python对象
prompt = json_post_list.get('prompt') # 获取请求中的提示
history = json_post_list.get('history', []) # 获取请求中的历史记录
messages = [
# {"role": "system", "content": "You are a helpful assistant."},
{"role": "user", "content": prompt}
]
# 调用模型进行对话生成
input_str = bulid_input(prompt=prompt, history=history)
input_ids = tokenizer.encode(input_str, add_special_tokens=False, return_tensors='pt').cuda()
generated_ids = model.generate(
input_ids=input_ids, max_new_tokens=512, do_sample=True,
top_p=0.9, temperature=0.5, repetition_penalty=1.1,pad_token_id=tokenizer.encode('<|eot_id|>')[0], eos_token_id=tokenizer.encode('<|eot_id|>')[0]
)
outputs = generated_ids.tolist()[0][len(input_ids[0]):]
response = tokenizer.decode(outputs)
response = response.strip().replace('<|eot_id|>', "").replace('<|start_header_id|>assistant<|end_header_id|>\n\n', '').strip() # 解析 chat 模版
now = datetime.datetime.now() # 获取当前时间
time = now.strftime("%Y-%m-%d %H:%M:%S") # 格式化时间为字符串
# 构建响应JSON
answer = {
"response": response,
"status": 200,
"time": time
}
# 构建日志信息
log = "[" + time + "] " + '", prompt:"' + prompt + '", response:"' + repr(response) + '"'
print(log) # 打印日志
torch_gc() # 执行GPU内存清理
return answer # 返回响应
# 主函数入口
if __name__ == '__main__':
# 加载预训练的分词器和模型
model_name_or_path = 'meta-llama/Meta-Llama-3-8B-Instruct'
tokenizer = AutoTokenizer.from_pretrained(model_name_or_path, use_fast=False)
model = AutoModelForCausalLM.from_pretrained(model_name_or_path, device_map="auto", torch_dtype=torch.bfloat16).cuda()
# 启动FastAPI应用
# 用6006端口可以将autodl的端口映射到本地，从而在本地使用api
uvicorn.run(app, host='0.0.0.0', port=6006, workers=1) # 在指定端口和主机上启动应用
|