app.py

import re
from typing import List

import gradio as gr
import openai
import pinecone
from llama_index import VectorStoreIndex, StorageContext
from llama_index.chat_engine.types import ChatMode
from llama_index.llms import ChatMessage, MessageRole
from llama_index.vector_stores import PineconeVectorStore

from environments import OPENAI_API_KEY, PINECONE_API_KEY, PINECONE_INDEX, PASSWORD

openai.api_key = OPENAI_API_KEY
# openai.log = 'debug'

pinecone.init(
    api_key=PINECONE_API_KEY,
    environment='gcp-starter'
)
pinecone_index = pinecone.Index(PINECONE_INDEX)

vector_store = PineconeVectorStore(pinecone_index=pinecone_index)
storage_context = StorageContext.from_defaults(vector_store=vector_store)
index = VectorStoreIndex.from_documents([], storage_context=storage_context)
chat_engine = index.as_chat_engine(chat_mode=ChatMode.CONTEXT)

SYSTEM_PROMPT = '你是屯門地區康健中心的智能助理「點子」，你能解答關於屯門地區康健中心的服務內容。' \
                ''

CHAT_EXAMPLES = [
    '你可以自我介紹嗎？',
    '中心地址及服務時間',
    '中心提供什麼服務？',
    '中心有提供關於慢性疾病管理的服務嗎？',
    '服務收費如何？',
]


def convert_to_chat_messages(history: List[List[str]]) -> List[ChatMessage]:
    chat_messages = [ChatMessage(role=MessageRole.SYSTEM,
                                 content=SYSTEM_PROMPT)]
    for conversation in history:
        for index, message in enumerate(conversation):
            if not message:
                continue

            message = re.sub(r'\n \n\n---\n\n參考: \n.*$', '', message, flags=re.DOTALL)
            role = MessageRole.USER if index % 2 == 0 else MessageRole.ASSISTANT
            chat_message = ChatMessage(role=role, content=message.strip())
            chat_messages.append(chat_message)
    return chat_messages


def predict(message, history):
    response = chat_engine.stream_chat(message, chat_history=convert_to_chat_messages(history))
    partial_message = ""
    for token in response.response_gen:
        partial_message = partial_message + token
        yield partial_message

    urls = []
    for source in response.source_nodes:
        if source.score < 0.78:
            continue
        url = source.node.metadata.get('source')
        if url:
            urls.append(url)

    if urls:
        partial_message = partial_message + "\n&nbsp;\n\n---\n\n參考: \n"
        for url in list(set(urls)):
            partial_message = partial_message + f"- {url}\n"
        yield partial_message


def predict_with_rag(message, history):
    return predict(message, history)


# For 'With Prompt Wrapper' - Add system prompt, no Pinecone
def predict_with_prompt_wrapper(message, history):
    yield from _invoke_chatgpt(history, message, is_include_system_prompt=True)


# For 'Vanilla ChatGPT' - No system prompt
def predict_vanilla_chatgpt(message, history):
    yield from _invoke_chatgpt(history, message)


def _invoke_chatgpt(history, message, is_include_system_prompt=False):
    history_openai_format = []
    if is_include_system_prompt:
        history_openai_format.append({"role": "system", "content": SYSTEM_PROMPT})
    for human, assistant in history:
        history_openai_format.append({"role": "user", "content": human})
        history_openai_format.append({"role": "assistant", "content": assistant})
    history_openai_format.append({"role": "user", "content": message})

    response = openai.ChatCompletion.create(
        model='gpt-3.5-turbo',
        messages=history_openai_format,
        temperature=1.0,
        stream=True
    )
    partial_message = ""
    for chunk in response:
        if len(chunk['choices'][0]['delta']) != 0:
            partial_message = partial_message + chunk['choices'][0]['delta']['content']
            yield partial_message


def vote(data: gr.LikeData):
    if data.liked:
        gr.Info("You up-voted this response: " + data.value)
    else:
        gr.Info("You down-voted this response: " + data.value)


chatbot = gr.Chatbot()

with gr.Blocks() as demo:
    gr.Markdown("# 屯門地區康健中心智能助理「點子」")

    with gr.Tab("With RAG (Retrieval Augmented Generation)"):
        gr.ChatInterface(predict,
                         chatbot=chatbot,
                         examples=CHAT_EXAMPLES,
                         )
    chatbot.like(vote, None, None)  # Adding this line causes the like/dislike icons to appear in your chatbot

    # with gr.Tab("With Initial System Prompt (a.k.a. prompt wrapper)"):
    #     gr.ChatInterface(predict_with_prompt_wrapper, examples=CHAT_EXAMPLES)
    #
    # with gr.Tab("Vanilla ChatGPT without modification"):
    #     gr.ChatInterface(predict_vanilla_chatgpt, examples=CHAT_EXAMPLES)

demo.queue()
demo.launch(share=False, auth=("demo", PASSWORD))