app.py

streamlit>=1.25
langchain
huggingface_hub
transformers

import streamlit as st
from langchain.llms import HuggingFaceHub
from langchain import PromptTemplate, LLMChain

st.title("🤖 Quest AI Assistant")

template = """
You are a helpful AI assistant. 
User question: {question}
"""
prompt = PromptTemplate(input_variables=["question"], template=template)

llm = HuggingFaceHub(
    repo_id="google/flan-t5-large", 
    model_kwargs={"temperature": 0.5, "max_length": 256}
)

chain = LLMChain(prompt=prompt, llm=llm)

question = st.text_input("Ask something:")
if st.button("Get Answer"):
    response = chain.run(question)
    st.write(response)