class_docstr: Pickler subclass used by multiprocessing.
docstr: Register a reduce function for a type.
docstr_tok: ["Register","a","reduce","function","for","a","type","."]
code: def register(cls, type, reduce):
      """Register a reduce function for a type."""
      cls._extra_reducers[type] = reduce
  
imports: from abc import ABCMeta
  import copyreg
  import functools
  import io
  import os
  import pickle
  import socket
  import sys
  from .None import context
label_desc: Use image node_id 2 for calling the ForkingPickler obj's underlying member method code with example usage: obj.register(cls, type, reduce) without return types