fix output warning

app.py

@@ -14,6 +14,6 @@ def recognize_digit(image):
 
 gr.Interface(fn=recognize_digit, 
              inputs="sketchpad", 
-             outputs=gr.outputs.Label(num_top_classes=3),
+             outputs=gr.Label(num_top_classes=3),
              live=True,
              description="Live MNIST.").launch();