Update app.py

app.py

@@ -583,6 +583,7 @@ def unet_enssemble(n_classes=2, height=64, width=64, channels=3, metrics = ['acc
     return model
 
 n_classes = 23
+n_channels = 3
 model = unet_enssemble(n_classes=n_classes, height = pach_size, width = pach_size, channels = n_channels)