class_docstr: tracker for rabit
class_docstr_tok: ["tracker","for","rabit"]
code: def join(self):
      while self.thread.isAlive():
          self.thread.join(100)
  
imports: from __future__ import absolute_import
  import os
  import sys
  import socket
  import struct
  import subprocess
  import argparse
  import time
  import logging
  from threading import Thread
label_desc: Use image node_id 11 for calling the RabitTracker obj's underlying member method code with example usage: obj.join() without return types