code: def _rebuild_socket(df, family, type, proto):
      fd = df.detach()
      return socket.fromfd(fd, family, type, proto)
  
file_path: catboost/contrib/python/joblib/joblib/externals/loky/backend/_posix_reduction.py
imports: import os
  import socket
  import _socket
  from multiprocessing.connection import Connection
  from multiprocessing.context import get_spawning_popen
  from .reduction import register
label_desc: Use image node_id 4 for calling a global function with example usage: _rebuild_socket(df, family, type, proto) and returns: socket