app.py

import gradio as gr
from transformers import pipeline, AutoTokenizer, AutoModelForSequenceClassification
import logging

# Set up logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Initialize models
question_answerer = None
class_pipe = None

# Define topic labels (replace with your actual labels)
TOPIC_LABELS = {
    0: "Science & Technology",
    1: "Health & Medicine", 
    2: "Business & Finance",
    3: "Entertainment",
    4: "Politics",
    5: "Sports",
    6: "Education",
    7: "Culture & Society",
    8: "Computers & Internet",
    9: "Other"
}

def load_models():
    """Load both models with error handling"""
    global question_answerer, class_pipe
    try:
        logger.info("Loading QA model...")
        question_answerer = pipeline(
            "question-answering",
            model='distilbert-base-cased-distilled-squad'
        )
        
        logger.info("Loading classification model...")
        # Replace with your actual fine-tuned model path
        class_model = "Lindalynn/Yahoo_Question_Classifier"
        tokenizer = AutoTokenizer.from_pretrained(class_model)
        model = AutoModelForSequenceClassification.from_pretrained(class_model)
        
        class_pipe = pipeline(
            "text-classification",
            model=model,
            tokenizer=tokenizer
        )
        return True
    except Exception as e:
        logger.error(f"Model loading failed: {str(e)}")
        return False

def process_question(question, context):
    """Process question through both models"""
    if not load_models():
        return "Models failed to load", "Error"
    
    if not question.strip():
        return "Please enter a question", "Invalid input"
    
    try:
        # QA Model - Using the exact deployment style you provided
        qa_result = question_answerer(
            question=question,
            context=context
        )
        answer = qa_result['answer']
        score = round(qa_result['score'], 4)
        
        # Classification Model
        class_result = class_pipe(question)
        label = class_result[0]['label']
        topic = TOPIC_LABELS.get(int(label.split('_')[-1]), "General")
        
        # Format output with score information as in your example
        formatted_answer = f"Answer: '{answer}', score: {score}, topic: {topic}"
        
        return formatted_answer, topic
        
    except Exception as e:
        logger.error(f"Processing error: {str(e)}")
        return "Error processing question", "Error"

# Create Gradio interface
with gr.Blocks(theme=gr.themes.Soft()) as demo:
    gr.Markdown("""
    # 🤖 QA with Classification
    *Question Answering with distilbert-base-cased-distilled-squad*
    """)
    
    with gr.Row():
        with gr.Column():
            context_input = gr.Textbox(
                label="Context",
                placeholder="Enter the context text here...",
                lines=3
            )
            question_input = gr.Textbox(
                label="Question",
                placeholder="Enter your question here...",
                lines=2
            )
            submit_btn = gr.Button("Get Answer", variant="primary")
        
        with gr.Column():
            answer_output = gr.Textbox(
                label="QA Result",
                interactive=False
            )
            topic_output = gr.Textbox(
                label="Detected Topic",
                interactive=False
            )
    
    # Example context and questions
    gr.Examples(
        examples=[
            [
                "Alice is sitting on the bench. Bob is sitting next to her.",
                "Who is sitting on the bench?"
            ],
            [
                "The company was founded in 2010 by Elon Musk. The current CEO is Tim Cook.",
                "Who is the current CEO?"
            ]
        ],
        inputs=[context_input, question_input]
    )
    
    submit_btn.click(
        fn=process_question,
        inputs=[question_input, context_input],
        outputs=[answer_output, topic_output]
    )

# Launch the interface
if __name__ == "__main__":
    demo.launch()