message: K is no longer an alias of backend
diff: @@ -2875,7 +2875,7 @@ class MeanIoU(Metric):
  y_pred = math_ops.cast(y_pred, self._dtype)
  # If y_pred is passed as a logits tensor, or a probability tensor
  - if len(K.int_shape(y_true)) == len(K.int_shape(y_pred)) - 1:
  + if len(backend.int_shape(y_true)) == len(backend.int_shape(y_pred)) - 1:
  y_pred = math_ops.argmax(y_pred, axis=-1)
  # Flatten the input if its rank > 1.
  