code: def get_relation_span(self, rel, entities):
      bound = []
      for entity_index in [rel["head"], rel["tail"]]:
          bound.append(entities[entity_index]["start"])
          bound.append(entities[entity_index]["end"])
      return min(bound), max(bound)
  
label_desc: Use image node_id 3 for calling the VQAReTokenRelation obj's underlying member method code with example usage: obj.get_relation_span(rel, entities) and returns: min,  max