try to fix syntax issue

app.py

@@ -8,9 +8,9 @@ from fastai.vision.widgets import *
 f = Path() / 'bamboo_or_butterfly.pkl'
 learn_inf = load_learner(f)
 
-def predict(img)
+def predict(img):
     pred, pred_idx, probs = learn_inf.predict(img.to_thumb(224))
-    f'Prediction: {pred}; Probability:{probs[pred_idx]:.04f}'
+    return f'Prediction: {pred}; Probability:{probs[pred_idx]:.04f}'
 
 iface = gr.Interface(fn=predict, inputs="image", outputs="text")
 iface.launch()