app.py

import os
import gradio as gr
from transformers import AutoModelForCausalLM, AutoTokenizer
import pandas as pd
from datetime import datetime, timedelta, timezone
import torch
from config import hugging_face_token, init_google_sheets_client, models, default_model_name, user_names, google_sheets_name, MAX_INTERACTIONS
import spaces

# Hack for ZeroGPU
torch.jit.script = lambda f: f

# Initialize Google Sheets client
client = init_google_sheets_client()
sheet = client.open(google_sheets_name)
stories_sheet = sheet.worksheet("Stories")
system_prompts_sheet = sheet.worksheet("System Prompts")

# Load stories from Google Sheets
def load_stories():
    stories_data = stories_sheet.get_all_values()
    stories = [{"title": story[0], "story": story[1]} for story in stories_data if story[0] != "Title"]  # Skip header row
    return stories

# Load system prompts from Google Sheets
def load_system_prompts():
    system_prompts_data = system_prompts_sheet.get_all_values()
    system_prompts = [prompt[0] for prompt in system_prompts_data[1:]]  # Skip header row
    return system_prompts

# Load available stories and system prompts
stories = load_stories()
system_prompts = load_system_prompts()

# Initialize the selected model
selected_model = default_model_name
tokenizer, model = None, None

# Initialize the data list
data = []

# Load the model and tokenizer once at the beginning
def load_model(model_name):
    global tokenizer, model, selected_model
    try:
        # Release the memory of the previous model if exists
        if model is not None:
            del model
            torch.cuda.empty_cache()
        
        tokenizer = AutoTokenizer.from_pretrained(models[model_name], padding_side='left', token=hugging_face_token, trust_remote_code=True)
        
        # Ensure the padding token is set
        if tokenizer.pad_token is None:
            tokenizer.pad_token = tokenizer.eos_token
            tokenizer.add_special_tokens({'pad_token': tokenizer.eos_token})
        
        model = AutoModelForCausalLM.from_pretrained(models[model_name], token=hugging_face_token, trust_remote_code=True)
        selected_model = model_name
    except Exception as e:
        print(f"Error loading model {model_name}: {e}")
        raise e
    return tokenizer, model

# Ensure the initial model is loaded
tokenizer, model = load_model(selected_model)

# Chat history
chat_history = []

# Function to handle interaction with model
@spaces.GPU
def interact(user_input, history, interaction_count):
    global tokenizer, model
    try:
        if tokenizer is None or model is None:
            raise ValueError("Tokenizer or model is not initialized.")
        
        if interaction_count >= MAX_INTERACTIONS:
            user_input += ". Thank you for your questions. Our session is now over. Goodbye!"
        
        messages = history + [{"role": "user", "content": user_input}]
        
        # Ensure roles alternate correctly
        for i in range(1, len(messages)):
            if messages[i-1].get("role") == messages[i].get("role"):
                raise ValueError("Conversation roles must alternate user/assistant/user/assistant/...")
        
        prompt = tokenizer.apply_chat_template(messages, tokenize=False, add_generation_prompt=True)
        
        # Generate response using selected model
        input_ids = tokenizer(prompt, return_tensors='pt').input_ids
        chat_history_ids = model.generate(input_ids, max_new_tokens=100, pad_token_id=tokenizer.eos_token_id, temperature=0.1)
        response = tokenizer.decode(chat_history_ids[:, input_ids.shape[-1]:][0], skip_special_tokens=True)
        
        # Update chat history with generated response
        history.append({"role": "user", "content": user_input})
        history.append({"role": "assistant", "content": response})
        
        interaction_count += 1
        
        formatted_history = [(entry["content"], None) if entry["role"] == "user" else (None, entry["content"]) for entry in history if entry["role"] in ["user", "assistant"]]
        
        return "", formatted_history, history, interaction_count
    except Exception as e:
        if torch.cuda.is_available():
            torch.cuda.empty_cache()
        print(f"Error during interaction: {e}")
        raise gr.Error(f"An error occurred during interaction: {str(e)}")

# Function to send selected story and initial message
def send_selected_story(title, model_name, system_prompt):
    global chat_history
    global selected_story
    global data  # Ensure data is reset
    data = []  # Reset data for new story
    interaction_count = 1  # Reset interaction count for new story
    tokenizer, model = load_model(model_name)
    selected_story = title
    for story in stories:
        if story["title"] == title:
            system_prompt = f"""
{system_prompt}
Here is the story:
---
{story['story']}
---
            """
            combined_message = system_prompt.strip()
            if combined_message:
                chat_history = []  # Reset chat history
                chat_history.append({"role": "system", "content": combined_message})
                question_prompt = "Please ask a simple question about the story to encourage interaction."
                _, formatted_history, chat_history, interaction_count = interact(question_prompt, chat_history, interaction_count)

                return formatted_history, chat_history, gr.update(value=[]), story["story"]
            else:
                print("Combined message is empty.")
        else:
            print("Story title does not match.")

# Function to save comment and score
def save_comment_score(chat_responses, score, comment, story_name, user_name, system_prompt):
    full_chat_history = ""

    # Create formatted chat history with roles
    for message in chat_responses:
        if message[0]:  # User message
            full_chat_history += f"User: {message[0]}\n"
        if message[1]:  # Assistant message
            full_chat_history += f"Assistant: {message[1]}\n"

    timestamp = datetime.now(timezone.utc) - timedelta(hours=3)  # Adjust to GMT-3
    timestamp_str = timestamp.strftime("%Y-%m-%d %H:%M:%S")
    model_name = selected_model

    # Append data to local data storage
    data.append([
        timestamp_str,
        user_name,
        model_name,
        system_prompt,
        story_name,
        full_chat_history,
        score,
        comment
    ])

    # Append data to Google Sheets
    try:
        user_sheet = client.open(google_sheets_name).worksheet(user_name)
    except gspread.exceptions.WorksheetNotFound:
        user_sheet = client.open(google_sheets_name).add_worksheet(title=user_name, rows="100", cols="20")
    
    user_sheet.append_row([timestamp_str, user_name, model_name, system_prompt, story_name, full_chat_history, score, comment])

    df = pd.DataFrame(data, columns=["Timestamp", "User Name", "Model Name", "System Prompt", "Story Name", "Chat History", "Score", "Comment"])
    return df[["Chat History", "Score", "Comment"]], gr.update(value="")  # Show only the required columns and clear the comment input box

# Function to load user guide from a file
def load_user_guide():
    with open('user_guide.txt', 'r') as file:
        return file.read()

# Create the chat interface using Gradio Blocks
with gr.Blocks() as demo:
    with gr.Tabs():
        with gr.TabItem("Chat"):
            gr.Markdown("# Demo Chatbot V3")

            gr.Markdown("## Context")
            with gr.Group():
                model_dropdown = gr.Dropdown(choices=list(models.keys()), label="Select Model", value=selected_model)
                user_dropdown = gr.Dropdown(choices=user_names, label="Select User Name")
                initial_story = stories[0]["title"] if stories else None
                story_dropdown = gr.Dropdown(choices=[story["title"] for story in stories], label="Select Story", value=initial_story)
                system_prompt_dropdown = gr.Dropdown(choices=system_prompts, label="Select System Prompt", value=system_prompts[0])
                send_story_button = gr.Button("Send Story")

            gr.Markdown("## Chat")
            with gr.Group():
                selected_story_textbox = gr.Textbox(label="Selected Story", lines=10, interactive=False)
                chatbot_output = gr.Chatbot(label="Chat History")
                chatbot_input = gr.Textbox(placeholder="Type your message here...", label="User Input")
                send_message_button = gr.Button("Send")

            gr.Markdown("## Evaluation")
            with gr.Group():
                score_input = gr.Slider(minimum=0, maximum=5, step=1, label="Score")
                comment_input = gr.Textbox(placeholder="Add a comment...", label="Comment")
                save_button = gr.Button("Save Score and Comment")
                data_table = gr.DataFrame(headers=["Chat History", "Score", "Comment"])

        with gr.TabItem("User Guide"):
            gr.Textbox(label="User Guide", value=load_user_guide(), lines=20)
            
    chat_history_json = gr.JSON(value=[], visible=False)
    interaction_count = gr.Number(value=0, visible=False)

    send_story_button.click(fn=send_selected_story, inputs=[story_dropdown, model_dropdown, system_prompt_dropdown], outputs=[chatbot_output, chat_history_json, data_table, selected_story_textbox])
    send_message_button.click(fn=interact, inputs=[chatbot_input, chat_history_json, interaction_count], outputs=[chatbot_input, chatbot_output, chat_history_json, interaction_count])
    save_button.click(fn=save_comment_score, inputs=[chatbot_output, score_input, comment_input, story_dropdown, user_dropdown, system_prompt_dropdown], outputs=[data_table, comment_input])

demo.launch()