app.py

import os
import streamlit as st
from transformers import pipeline, Conversation

import time

model_id = "arampacha/DialoGPT-medium-simpsons"

@st.cache(allow_output_mutation=True)
def get_pipeline():
    return pipeline("conversational", model=model_id)

dialog = get_pipeline()

parameters = {
    "min_length":None,
    "max_length":100,
    "top_p":0.92,
    "temperature":1.0,
    "repetition_penalty":None,
    "do_sample":True,
}


def on_input():
    if st.session_state.count > 0:
        user_input = st.session_state.user_input
        st.session_state.full_text += f"_user_  >>> {user_input}\n\n"
        dialog_output.markdown(st.session_state.full_text)
        st.session_state.user_input = ""

        conv = Conversation(
            text =  user_input,
            past_user_inputs = st.session_state.past_user_inputs,
            generated_responses = st.session_state.generated_responses,
        )
        conv = dialog(conv, **parameters)
        try:
            st.session_state.update({
                "past_user_inputs": conv.past_user_inputs,
                "generated_responses": conv.generated_responses,
            })
            st.session_state.full_text += f'_chatbot_ > {conv.generated_responses[-1]}\n\n'
        except Exception as e:
            st.write("D'oh! Something went wrong. Try to rerun the app.")
            st.write(conv)
            st.write(e)
    st.session_state.count += 1

# init session state
if "past_user_inputs" not in st.session_state:
    st.session_state["past_user_inputs"] = []
if "generated_responses" not in st.session_state:
    st.session_state["generated_responses"] = []
if "full_text" not in st.session_state:
    st.session_state["full_text"] = ""
if "user_input" not in st.session_state:
    st.session_state["user_input"] = ""
if "count" not in st.session_state:
    st.session_state["count"] = 0

# body
st.title("Chat with Simpsons")

st.image(
    "https://raw.githubusercontent.com/arampacha/chat-with-simpsons/main/the-simpsons.png",
    caption="(c) 20th Century Fox Television",
)
if st.session_state.count == 0:
    st.write("Start dialog by inputing some text:")

dialog_output = st.empty()

if st.session_state.count > 0:
    dialog_output.markdown(st.session_state.full_text)

user_input = st.text_input(
    "user >> ",
    # value="Hey Homer! How is it going?",
    on_change=on_input(),
    key="user_input",
)

dialog_text = st.session_state.full_text
dialog_output.markdown(dialog_text)

def restart():
    st.session_state.clear()
    
st.button("Restart", on_click=st.session_state.clear)