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from transformers import pipeline
import streamlit as st
# Set up Streamlit app title and page width
st.set_page_config(page_title='Simple Chatbot with Streamlit', layout='wide')
# Load conversational pipeline
chatbot = pipeline("text2text-generation", model="facebook/blenderbot-400M-distill")
# Initialize chat history in session state
if 'chat_history' not in st.session_state:
st.session_state['chat_history'] = []
# Define Streamlit app layout
st.markdown("""
<style>
body {
background-color: #f0f2f6;
}
.stApp {
max-width: 800px;
margin: auto;
padding-top: 50px;
}
.stTextInput {
margin-bottom: 20px;
}
.stButton button {
background-color: #4CAF50; /* Green */
border: none;
color: white;
padding: 15px 32px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
cursor: pointer;
border-radius: 5px;
}
.stButton button:hover {
background-color: #7EC0EE; /* Darker sky blue on hover */
}
.chat-container {
padding:6px;
border-radius: 5px;
overflow: hidden;
box-shadow: 0 4px 8px rgba(255, 255, 255, 0.3);
# border: 1px solid #d3d3d3;
overflow: hidden;
}
.user-message {
background-color: #4CAF50;
color: white;
padding: 10px 20px;
margin: 5px;
border-radius: 5px;
clear: both;
float: left;
}
.bot-message {
background-color: #f1f1f1;
color: black;
padding: 10px 20px;stButton
margin: 5px;
border-radius: 5px;
clear: both;
float: right;
}
</style>
""", unsafe_allow_html=True)
# Define Streamlit app layout
st.markdown("<h1 style='color: orange;'>💬 Chatbot</h1>", unsafe_allow_html=True)
st.caption("🚀 Chat bot created By :- [Dinesh Abeysinghe (AI-ML Engineer)](https://www.linkedin.com/in/dinesh-abeysinghe-bb773293)")
# Create text area for user input
user_input = st.text_input("", placeholder="Your message")
# Define Streamlit app behavior
if st.button('Send'):
if not user_input.strip(): # Check if input is empty or whitespace
st.error('Please enter a chat')
else:
chat_history = st.session_state['chat_history']
chat_history.append({"role": "user", "message": user_input})
with st.spinner(text='Thinking ...'):
conversation_bot_result = chatbot(user_input)
bot_response = conversation_bot_result[0]["generated_text"]
chat_history.append({"role": "bot", "message": bot_response})
# Update chat history in session state
st.session_state['chat_history'] = chat_history
# Create text area for chat history
chat_area = st.empty()
# Display the chat history with alternating user and bot messages
chat_text = ""
user_messages = [chat for chat in st.session_state['chat_history'] if chat['role'] == 'user']
bot_messages = [chat for chat in st.session_state['chat_history'] if chat['role'] == 'bot']
for user_chat, bot_chat in zip(reversed(user_messages), reversed(bot_messages)):
chat_text += f"<div class='user-message'>{user_chat['message']}</div>\n"
chat_text += f"<div class='bot-message'>{bot_chat['message']}</div>\n"
# Add any remaining user messages if there are more user messages than bot messages
for user_chat in reversed(user_messages[len(bot_messages):]):
chat_text += f"<div class='user-message'>{user_chat['message']}</div>\n"
chat_area.markdown(f"<div class='chat-container'>{chat_text}</div>", unsafe_allow_html=True)
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