message: Use more efficient squared_difference instead of square(diff)
diff: @@ -790,7 +790,7 @@ class Huber(Loss):
  'keras.losses.mse',
  'keras.losses.MSE')
  def mean_squared_error(y_true, y_pred):
  - return K.mean(math_ops.square(y_pred - y_true), axis=-1)
  + return K.mean(math_ops.squared_difference(y_pred, y_true), axis=-1)
  @keras_export('keras.metrics.mean_absolute_error',
  