def image_summary_or_default_string(summary_name, image):
      """Returns image summaries for non-padded elements."""
      return tf.cond(
          tf.equal(tf.size(tf.shape(image)), 4),
          lambda: tf.summary.image(summary_name, image),
          lambda: tf.constant(''))
Returns image summaries for non-padded elements.
inference_api/src/main/object_detection/utils/visualization_utils.py