code: def get_state_valid_tokens(
      self, src_sentence: List[str], tgt_generated: List[str]
  ) -> List[str]:
      pass
  
file_path: DeepKE/src/deepke/name_entity_re/cross/seq2seq/constraint_decoder/constraint_decoder.py
imports: from collections import defaultdict
  import os
  from typing import List
label_desc: Use image node_id 2 for calling the ConstraintDecoder obj's underlying member method code with example usage: obj.get_state_valid_tokens(src_sentence, tgt_generated) without return types