code: def extract_sub_relations(
      self,
      mention_x: MentionDataLight,
      mention_y: MentionDataLight,
      relation: RelationType,
  ) -> RelationType:
      raise NotImplementedError
  
file_path: nlp-architect/nlp_architect/data/cdc_resources/relations/relation_extraction.py
imports: from typing import List
  from nlp_architect.common.cdc.mention_data import MentionDataLight
  from nlp_architect.data.cdc_resources.relations.relation_types_enums import RelationType
label_desc: Use image node_id 3 for calling the RelationExtraction obj's underlying member method code with example usage: obj.extract_sub_relations(mention_x, mention_y, relation) without return types