def _get_null_input(self, _):
    null_image = tf.zeros([224, 224, 3], tf.float32)
    return (null_image, tf.constant(0, tf.float32))
def _get_null_input(self, _):
    null_image = tf.zeros([224, 224, 3], tf.float32)
    return (null_image, tf.constant(0, tf.float32))