Lagent / app.py
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import os
import asyncio
import json
import re
import requests
import streamlit as st
from lagent.agents import Agent
from lagent.prompts.parsers import PluginParser
from lagent.agents.stream import PLUGIN_CN, get_plugin_prompt
from lagent.schema import AgentMessage
from lagent.actions import ArxivSearch
from lagent.hooks import Hook
from lagent.llms import GPTAPI
YOUR_TOKEN_HERE = os.getenv("token")
if not YOUR_TOKEN_HERE:
raise EnvironmentError("未找到环境变量 'token',请设置后再运行程序。")
# Hook类,用于对消息添加前缀
class PrefixedMessageHook(Hook):
def __init__(self, prefix, senders=None):
"""
初始化Hook
:param prefix: 消息前缀
:param senders: 指定发送者列表
"""
self.prefix = prefix
self.senders = senders or []
def before_agent(self, agent, messages, session_id):
"""
在代理处理消息前修改消息内容
:param agent: 当前代理
:param messages: 消息列表
:param session_id: 会话ID
"""
for message in messages:
if message.sender in self.senders:
message.content = self.prefix + message.content
class AsyncBlogger:
"""博客生成类,整合写作者和批评者。"""
def __init__(self, model_type, api_base, writer_prompt, critic_prompt, critic_prefix='', max_turn=2):
"""
初始化博客生成器
:param model_type: 模型类型
:param api_base: API 基地址
:param writer_prompt: 写作者提示词
:param critic_prompt: 批评者提示词
:param critic_prefix: 批评消息前缀
:param max_turn: 最大轮次
"""
self.model_type = model_type
self.api_base = api_base
self.llm = GPTAPI(
model_type=model_type,
api_base=api_base,
key=YOUR_TOKEN_HERE,
max_new_tokens=4096,
)
self.plugins = [dict(type='lagent.actions.ArxivSearch')]
self.writer = Agent(
self.llm,
writer_prompt,
name='写作者',
output_format=dict(
type=PluginParser,
template=PLUGIN_CN,
prompt=get_plugin_prompt(self.plugins)
)
)
self.critic = Agent(
self.llm,
critic_prompt,
name='批评者',
hooks=[PrefixedMessageHook(critic_prefix, ['写作者'])]
)
self.max_turn = max_turn
async def forward(self, message: AgentMessage, update_placeholder):
"""
执行多阶段博客生成流程
:param message: 初始消息
:param update_placeholder: Streamlit占位符
:return: 最终优化的博客内容
"""
step1_placeholder = update_placeholder.container()
step2_placeholder = update_placeholder.container()
step3_placeholder = update_placeholder.container()
# 第一步:生成初始内容
step1_placeholder.markdown("**Step 1: 生成初始内容...**")
message = self.writer(message)
if message.content:
step1_placeholder.markdown(f"**生成的初始内容**:\n\n{message.content}")
else:
step1_placeholder.markdown("**生成的初始内容为空,请检查生成逻辑。**")
# 第二步:批评者提供反馈
step2_placeholder.markdown("**Step 2: 批评者正在提供反馈和文献推荐...**")
message = self.critic(message)
if message.content:
# 解析批评者反馈
suggestions = re.search(r"1\. 批评建议:\n(.*?)2\. 推荐的关键词:", message.content, re.S)
keywords = re.search(r"2\. 推荐的关键词:\n- (.*)", message.content)
feedback = suggestions.group(1).strip() if suggestions else "未提供批评建议"
keywords = keywords.group(1).strip() if keywords else "未提供关键词"
# Arxiv 文献查询
arxiv_search = ArxivSearch()
arxiv_results = arxiv_search.get_arxiv_article_information(keywords)
# 显示批评内容和文献推荐
message.content = f"**批评建议**:\n{feedback}\n\n**推荐的文献**:\n{arxiv_results}"
step2_placeholder.markdown(f"**批评和文献推荐**:\n\n{message.content}")
else:
step2_placeholder.markdown("**批评内容为空,请检查批评逻辑。**")
# 第三步:写作者根据反馈优化内容
step3_placeholder.markdown("**Step 3: 根据反馈改进内容...**")
improvement_prompt = AgentMessage(
sender="critic",
content=(
f"根据以下批评建议和推荐文献对内容进行改进:\n\n"
f"批评建议:\n{feedback}\n\n"
f"推荐文献:\n{arxiv_results}\n\n"
f"请优化初始内容,使其更加清晰、丰富,并符合专业水准。"
),
)
message = self.writer(improvement_prompt)
if message.content:
step3_placeholder.markdown(f"**最终优化的博客内容**:\n\n{message.content}")
else:
step3_placeholder.markdown("**最终优化的博客内容为空,请检查生成逻辑。**")
return message
def setup_sidebar():
"""设置侧边栏,选择模型。"""
model_name = st.sidebar.text_input('模型名称:', value='internlm2.5-latest')
api_base = st.sidebar.text_input(
'API Base 地址:', value='https://internlm-chat.intern-ai.org.cn/puyu/api/v1/chat/completions'
)
return model_name, api_base
def main():
"""
主函数:构建Streamlit界面并处理用户交互
"""
st.set_page_config(layout='wide', page_title='Lagent Web Demo', page_icon='🤖')
st.title("多代理博客优化助手")
model_type, api_base = setup_sidebar()
topic = st.text_input('输入一个话题:', 'Self-Supervised Learning')
generate_button = st.button('生成博客内容')
if (
'blogger' not in st.session_state or
st.session_state['model_type'] != model_type or
st.session_state['api_base'] != api_base
):
st.session_state['blogger'] = AsyncBlogger(
model_type=model_type,
api_base=api_base,
writer_prompt="你是一位优秀的AI内容写作者,请撰写一篇有吸引力且信息丰富的博客内容。",
critic_prompt="""
作为一位严谨的批评者,请给出建设性的批评和改进建议,并基于相关主题使用已有的工具推荐一些参考文献,推荐的关键词应该是英语形式,简洁且切题。
请按照以下格式提供反馈:
1. 批评建议:
- (具体建议)
2. 推荐的关键词:
- (关键词1, 关键词2, ...)
""",
critic_prefix="请批评以下内容,并提供改进建议:\n\n"
)
st.session_state['model_type'] = model_type
st.session_state['api_base'] = api_base
if generate_button:
update_placeholder = st.empty()
async def run_async_blogger():
message = AgentMessage(
sender='user',
content=f"请撰写一篇关于{topic}的博客文章,要求表达专业,生动有趣,并且易于理解。"
)
result = await st.session_state['blogger'].forward(message, update_placeholder)
return result
loop = asyncio.new_event_loop()
asyncio.set_event_loop(loop)
loop.run_until_complete(run_async_blogger())
if __name__ == '__main__':
main()