app.py

"""
Improved GAIA Agent with LLM Integration for Hugging Face Course
"""

import os
import gradio as gr
import requests
import pandas as pd
import json
import re
from typing import List, Dict, Any, Optional, Callable, Union
from transformers import AutoModelForSeq2SeqLM, AutoTokenizer

# --- Constants ---
DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
DEFAULT_MODEL = "google/flan-t5-small"  # Smaller model for faster loading

class LLMGAIAAgent:
    """
    An improved GAIA agent that uses a language model to generate responses
    instead of template-based answers.
    """
    
    def __init__(self, model_name=DEFAULT_MODEL):
        """Initialize the agent with a language model."""
        print(f"Initializing LLMGAIAAgent with model: {model_name}")
        try:
            self.tokenizer = AutoTokenizer.from_pretrained(model_name)
            self.model = AutoModelForSeq2SeqLM.from_pretrained(model_name)
            self.model_name = model_name
            print(f"Successfully loaded model: {model_name}")
        except Exception as e:
            print(f"Error loading model: {e}")
            print("Falling back to template-based responses")
            self.model = None
            self.tokenizer = None
            self.model_name = None
    
    def __call__(self, question: str) -> str:
        """Process a question and return an answer using the language model."""
        print(f"Processing question: {question}")
        
        # Check if model is available
        if self.model is None or self.tokenizer is None:
            return self._fallback_response(question)
        
        try:
            # Prepare prompt based on question type
            prompt = self._prepare_prompt(question)
            
            # Generate response using the model
            inputs = self.tokenizer(prompt, return_tensors="pt", max_length=512, truncation=True)
            outputs = self.model.generate(
                inputs["input_ids"],
                max_length=150,
                min_length=20,
                temperature=0.7,
                top_p=0.9,
                do_sample=True,
                num_return_sequences=1
            )
            
            # Decode the response
            response = self.tokenizer.decode(outputs[0], skip_special_tokens=True)
            
            # Clean up the response if needed
            response = self._clean_response(response)
            
            return response
        except Exception as e:
            print(f"Error generating response: {e}")
            return self._fallback_response(question)
    
    def _prepare_prompt(self, question: str) -> str:
        """Prepare an appropriate prompt based on the question type."""
        question_lower = question.lower()
        
        # Check for calculation questions
        if any(keyword in question_lower for keyword in [
            "calculate", "compute", "sum", "difference", 
            "product", "divide", "plus", "minus", "times"
        ]):
            return f"Solve this math problem step by step: {question}"
        
        # Check for image analysis questions
        elif any(keyword in question_lower for keyword in [
            "image", "picture", "photo", "graph", "chart", "diagram"
        ]):
            return f"Describe what might be seen in an image related to this question: {question}"
        
        # Check for factual questions
        elif any(keyword in question_lower for keyword in [
            "who", "what", "where", "when", "why", "how"
        ]):
            return f"Answer this factual question concisely and accurately: {question}"
        
        # Default prompt for general knowledge
        else:
            return f"Provide a concise, informative answer to this question: {question}"
    
    def _clean_response(self, response: str) -> str:
        """Clean up the model's response if needed."""
        # Remove any prefixes like "Answer:" or "Response:"
        for prefix in ["Answer:", "Response:", "A:"]:
            if response.startswith(prefix):
                response = response[len(prefix):].strip()
        
        # Ensure the response is not too short
        if len(response) < 10:
            return self._fallback_response("general")
        
        return response
    
    def _fallback_response(self, question: str) -> str:
        """Provide a fallback response if the model fails."""
        question_lower = question.lower()
        
        # Map question words to appropriate responses (similar to original GAIAAgent)
        if "who" in question_lower:
            return "The person involved is a notable figure in this field with significant contributions and achievements."
        elif "when" in question_lower:
            return "This occurred during a significant historical period, specifically in the early part of the relevant era."
        elif "where" in question_lower:
            return "The location is in a region known for its historical and cultural significance."
        elif "what" in question_lower:
            return "This refers to an important concept or entity that has several key characteristics and functions."
        elif "why" in question_lower:
            return "This happened due to a combination of factors including historical context, individual decisions, and broader societal trends."
        elif "how" in question_lower:
            return "The process involves several key steps that must be followed in sequence to achieve the desired outcome."
        
        # Fallback for other question types
        return "Based on my analysis, the answer to your question involves several important factors. First, we need to consider the context and specific details mentioned."


class EvaluationRunner:
    """
    Handles the evaluation process: fetching questions, running the agent,
    and submitting answers to the evaluation server.
    """
    
    def __init__(self, api_url: str = DEFAULT_API_URL):
        """Initialize with API endpoints."""
        self.api_url = api_url
        self.questions_url = f"{api_url}/questions"
        self.submit_url = f"{api_url}/submit"
    
    def run_evaluation(self, 
                      agent: Callable[[str], str], 
                      username: str, 
                      agent_code_url: str) -> tuple[str, pd.DataFrame]:
        """
        Run the full evaluation process:
        1. Fetch questions
        2. Run agent on all questions
        3. Submit answers
        4. Return results
        """
        # Fetch questions
        questions_data = self._fetch_questions()
        if isinstance(questions_data, str):  # Error message
            return questions_data, None
        
        # Run agent on all questions
        results_log, answers_payload = self._run_agent_on_questions(agent, questions_data)
        if not answers_payload:
            return "Agent did not produce any answers to submit.", pd.DataFrame(results_log)
        
        # Submit answers
        submission_result = self._submit_answers(username, agent_code_url, answers_payload)
        
        # Return results
        return submission_result, pd.DataFrame(results_log)
    
    def _fetch_questions(self) -> Union[List[Dict[str, Any]], str]:
        """Fetch questions from the evaluation server."""
        print(f"Fetching questions from: {self.questions_url}")
        try:
            response = requests.get(self.questions_url, timeout=15)
            response.raise_for_status()
            questions_data = response.json()
            
            if not questions_data:
                error_msg = "Fetched questions list is empty or invalid format."
                print(error_msg)
                return error_msg
            
            print(f"Successfully fetched {len(questions_data)} questions.")
            return questions_data
            
        except requests.exceptions.RequestException as e:
            error_msg = f"Error fetching questions: {e}"
            print(error_msg)
            return error_msg
            
        except requests.exceptions.JSONDecodeError as e:
            error_msg = f"Error decoding JSON response from questions endpoint: {e}"
            print(error_msg)
            print(f"Response text: {response.text[:500]}")
            return error_msg
            
        except Exception as e:
            error_msg = f"An unexpected error occurred fetching questions: {e}"
            print(error_msg)
            return error_msg
    
    def _run_agent_on_questions(self, 
                               agent: Callable[[str], str], 
                               questions_data: List[Dict[str, Any]]) -> tuple[List[Dict[str, Any]], List[Dict[str, Any]]]:
        """Run the agent on all questions and collect results."""
        results_log = []
        answers_payload = []
        
        print(f"Running agent on {len(questions_data)} questions...")
        for item in questions_data:
            task_id = item.get("task_id")
            question_text = item.get("question")
            
            if not task_id or question_text is None:
                print(f"Skipping item with missing task_id or question: {item}")
                continue
            
            try:
                submitted_answer = agent(question_text)
                answers_payload.append({
                    "task_id": task_id, 
                    "submitted_answer": submitted_answer
                })
                results_log.append({
                    "Task ID": task_id, 
                    "Question": question_text, 
                    "Submitted Answer": submitted_answer
                })
            except Exception as e:
                print(f"Error running agent on task {task_id}: {e}")
                results_log.append({
                    "Task ID": task_id, 
                    "Question": question_text, 
                    "Submitted Answer": f"AGENT ERROR: {e}"
                })
        
        return results_log, answers_payload
    
    def _submit_answers(self, 
                       username: str, 
                       agent_code_url: str, 
                       answers_payload: List[Dict[str, Any]]) -> str:
        """Submit answers to the evaluation server."""
        submission_data = {
            "username": username.strip(),
            "agent_code": agent_code_url,
            "answers": answers_payload
        }
        
        status_update = f"Agent finished. Submitting {len(answers_payload)} answers for user '{username}'..."
        print(status_update)
        
        try:
            response = requests.post(self.submit_url, json=submission_data, timeout=60)
            response.raise_for_status()
            result_data = response.json()
            
            final_status = (
                f"Submission Successful!\n"
                f"User: {result_data.get('username')}\n"
                f"Overall Score: {result_data.get('overall_score', 'N/A')}\n"
                f"Correct Answers: {result_data.get('correct_answers', 'N/A')}\n"
                f"Total Questions: {result_data.get('total_questions', 'N/A')}\n"
            )
            print(final_status)
            return final_status
            
        except requests.exceptions.RequestException as e:
            error_msg = f"Error submitting answers: {e}"
            print(error_msg)
            return error_msg
            
        except Exception as e:
            error_msg = f"An unexpected error occurred during submission: {e}"
            print(error_msg)
            return error_msg


def run_and_submit_all(profile: gr.OAuthProfile | None, *args):
    """
    Fetches all questions, runs the agent on them, submits all answers, and displays the results.
    This is the main function called by the Gradio interface.
    """
    # Check if user is logged in
    if not profile:
        return "Please Login to Hugging Face with the button.", None
    
    username = profile.username
    print(f"User logged in: {username}")
    
    # Get Space ID for code URL
    space_id = os.getenv("SPACE_ID")
    agent_code_url = f"https://huggingface.co/spaces/{space_id}/tree/main"
    print(f"Agent code URL: {agent_code_url}")
    
    # Initialize agent and evaluation runner
    try:
        # Use the LLM-based agent instead of the template-based one
        agent = LLMGAIAAgent()
        runner = EvaluationRunner()
    except Exception as e:
        error_msg = f"Error initializing agent or evaluation runner: {e}"
        print(error_msg)
        return error_msg, None
    
    # Run evaluation
    return runner.run_evaluation(agent, username, agent_code_url)


# --- Gradio Interface ---
with gr.Blocks() as demo:
    gr.Markdown("# GAIA Agent Evaluation Runner (LLM-Enhanced)")
    
    gr.Markdown("## Instructions:")
    gr.Markdown("1. Log in to your Hugging Face account using the button below.")
    gr.Markdown("2. Click 'Run Evaluation & Submit All Answers' to fetch questions, run the agent, and submit answers.")
    gr.Markdown("3. View your score and detailed results in the output section.")
    
    gr.Markdown("---")
    
    gr.Markdown("**Note:** This version uses a language model to generate responses. The evaluation process may take longer than the template-based version.")
    
    with gr.Row():
        login_button = gr.LoginButton(value="Sign in with Hugging Face")
    
    with gr.Row():
        submit_button = gr.Button("Run Evaluation & Submit All Answers")
    
    with gr.Row():
        with gr.Column():
            output_status = gr.Textbox(label="Submission Result")
            output_results = gr.Dataframe(label="Questions and Agent Answers")
    
    submit_button.click(run_and_submit_all, inputs=[login_button], outputs=[output_status, output_results])

if __name__ == "__main__":
    demo.launch()