class_docstr: tracker for rabit
class_docstr_tok: ["tracker","for","rabit"]
code: def alive(self):
      return self.thread.isAlive()
  
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 12 for calling the RabitTracker obj's underlying member method code with example usage: obj.alive() and returns: self