code: def get_max_label_map_index(label_map):
      """Get maximum index in label map.
  
      Args:
        label_map: a StringIntLabelMapProto
  
      Returns:
        an integer
      """
      return max([item.id for item in label_map.item])
  
file_path: SlowFast/ava_evaluation/label_map_util.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import logging
label_desc: Use image node_id 3 for calling a global function with example usage: get_max_label_map_index(label_map) and returns: max