Update app.py

Fixed a bug related to prediction being np.float32 not float

app.py

@@ -26,7 +26,7 @@ def predict(image):
 
     # Predict
     pred = model.predict(resized_image)
-    prob = pred[0][0]
+    prob = float(pred[0][0])
 
     scoring_output = {
         "Spam": prob,