app.py

import gradio as gr
import tensorflow as tf
import numpy as np
from PIL import Image
import cv2

# Load your trained model
model = tf.keras.models.load_model('brain_tumor_model.h5')  # or .keras

# Define class labels (adjust based on your model's classes)
CLASS_LABELS = [
    'glioma_tumor',
    'meningioma_tumor', 
    'no_tumor',
    'pituitary_tumor'
]

def preprocess_image(image):
    """Preprocess image for Xception model"""
    # Convert PIL to numpy array
    img_array = np.array(image)
    
    # Resize to 299x299 (Xception input size)
    img_resized = cv2.resize(img_array, (299, 299))
    
    # Ensure RGB format
    if len(img_resized.shape) == 3 and img_resized.shape[2] == 3:
        pass  # Already RGB
    elif len(img_resized.shape) == 2:
        img_resized = cv2.cvtColor(img_resized, cv2.COLOR_GRAY2RGB)
    
    # Normalize pixel values to [0, 1]
    img_normalized = img_resized.astype('float32') / 255.0
    
    # Add batch dimension
    img_batch = np.expand_dims(img_normalized, axis=0)
    
    return img_batch

def predict(image):
    """Make prediction on uploaded image"""
    if image is None:
        return "Please upload an image"
    
    try:
        # Preprocess the image
        processed_image = preprocess_image(image)
        
        # Make prediction
        predictions = model.predict(processed_image)
        
        # Get probabilities
        probabilities = tf.nn.softmax(predictions[0]).numpy()
        
        # Create results dictionary
        results = {}
        for i, label in enumerate(CLASS_LABELS):
            results[label.replace('_', ' ').title()] = float(probabilities[i])
        
        return results
        
    except Exception as e:
        return f"Error processing image: {str(e)}"

# Create Gradio interface
demo = gr.Interface(
    fn=predict,
    inputs=gr.Image(type="pil", label="Upload Brain MRI Scan"),
    outputs=gr.Label(num_top_classes=4, label="Prediction"),
    title="🧠 Brain Tumor Classification - Xception Model",
    description="""
    Upload an MRI brain scan image to classify tumor types.
    
    **Model:** Sequential Xception Architecture
    **Accuracy:** 99% (on validation set)
    **Classes:**
    - Glioma Tumor
    - Meningioma Tumor
    - No Tumor
    - Pituitary Tumor
    
    ⚠️ **Disclaimer:** For research/educational purposes only. Not for medical diagnosis.
    """,
    examples=[
        # Add example images if you have them
    ],
    theme=gr.themes.Soft(),
    analytics_enabled=False
)

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