app.py

import streamlit as st
import openai
from dotenv import load_dotenv
import os
from sentence_transformers import SentenceTransformer, util

# 从 .env 文件加载环境变量
load_dotenv()
api_key = os.getenv("")

def main():
    openai.api_key = api_key

    st.title('智能閱讀會問答系統')

    user_query = st.text_input("請輸入您的問題：", "")
    detail_level = st.select_slider("選擇回答的詳細程度：", options=['摘要', '中等', '詳細'])
    max_tokens_dict = {'摘要': 50, '中等': 100, '詳細': 150}

    # 初始化 Sentence Transformer 模型
    model = SentenceTransformer('all-MiniLM-L6-v2')

    def generate_answers_with_gpt_chat(question, detail):
        # 注意这里我们使用的是 ChatCompletion.create 方法
        response = openai.ChatCompletion.create(
            model="gpt-4",  # 使用 GPT-4 模型
            messages=[{"role": "system", "content": "您好，我是一个 AI 助手。请问有什么可以帮助您的？"},
                      {"role": "user", "content": question}],
            temperature=0.7,
            max_tokens=max_tokens_dict[detail]
        )
        return [message['content'] for message in response['messages'] if message['role'] == 'assistant']

    def calculate_similarity(answers, user_query):
        query_embedding = model.encode(user_query, convert_to_tensor=True)
        answer_embeddings = model.encode(answers, convert_to_tensor=True)
        cosine_scores = util.pytorch_cos_sim(query_embedding, answer_embeddings)[0]
        return cosine_scores.tolist()

    if st.button('提交'):
        if user_query:
            answers = generate_answers_with_gpt_chat(user_query, detail_level)
            similarities = calculate_similarity(answers, user_query)
            answers_with_scores = sorted(zip(answers, similarities), key=lambda x: x[1], reverse=True)
            
            st.subheader("生成並排序的答案：")
            for answer, score in answers_with_scores:
                st.text(f"答案: {answer}\n相似度分數: {score:.2f}")
        else:
            st.warning("請輸入一個問題。")

if __name__ == "__main__":
    main()