app.py

import gradio as gr
import torch
import torch.nn as nn
import timm
from torchvision import transforms
from PIL import Image

device = 'cuda' if torch.cuda.is_available() else 'cpu'
# Recreate the exact architecture used in training (Cell peD2iIoTExgh)
model = timm.create_model('efficientnet_b0', pretrained=False, num_classes=0).to(device)
num_ftrs = model.num_features

model.classifier = nn.Sequential(
    nn.Dropout(0.4),
    nn.Linear(num_ftrs, 256),
    nn.ReLU(),
    nn.Dropout(0.3),
    nn.Linear(256, 4)
).to(device)

model.load_state_dict(torch.load('best_model.pth', map_location=device))
model.eval()

labels = ['glioma', 'meningioma', 'notumor', 'pituitary']

def predict(img):
    transform = transforms.Compose([
        transforms.Resize((192, 192)),
        transforms.Grayscale(num_output_channels=3),
        transforms.ToTensor(),
        transforms.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225])
    ])
    img = transform(img).unsqueeze(0).to(device)
    with torch.no_grad():
        outputs = model(img)
        probs = torch.nn.functional.softmax(outputs[0], dim=0)
        return {labels[i]: float(probs[i]) for i in range(len(labels))}

interface = gr.Interface(fn=predict,
                         inputs=gr.Image(type='pil'),
                         outputs=gr.Label(num_top_classes=4),
                         title='Brain Tumor Classifier')

if __name__ == '__main__':
    interface.launch()