code: def find_free_tcp_port():
      """
      Find the free port that can be used for Rendezvous on the local machine.
      We use this for 1 machine training where the port is automatically detected.
      """
      import socket
  
      sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
      # Binding to port 0 will cause the OS to find an available port for us
      sock.bind(("", 0))
      port = sock.getsockname()[1]
      sock.close()
      # NOTE: there is still a chance the port could be taken by other processes.
      return port
  
imports: import collections
  import collections.abc
  import logging
  import os
  import random
  import sys
  import tempfile
  import time
  from functools import partial, wraps
  from typing import Tuple
  import numpy
  import pkg_resources
  import torch
  import torch.multiprocessing
  from iopath.common.file_io import g_pathmgr
  from scipy.sparse import csr_matrix
  from vissl.utils.extract_features_utils import ExtractedFeaturesLoader
label_desc: Use image node_id 6 for calling a global function with example usage: find_free_tcp_port() and returns: port