code: def pickle_union(obj):
      import functools, operator
  
      return functools.reduce, (operator.or_, obj.__args__)
  
file_path: catboost/contrib/tools/python3/src/Lib/copyreg.py
label_desc: Use image node_id 3 for calling a global function with example usage: pickle_union(obj) and returns: functools,  operator,  obj