class_docstr: Represents a node in a trie managing unordered constraints.
class_docstr_tok: ["Represents","a","node","in","a","trie","managing","unordered","constraints","."]
code: def id(self):
      return self.token
  
imports: from collections import Counter
  from typing import List, Optional, Set, Tuple
  import torch
label_desc: Use image node_id 2 for calling the ConstraintNode obj's underlying member method code with example usage: obj.id() and returns: self