class_docstr: tracker for rabit
class_docstr_tok: ["tracker","for","rabit"]
code: def start(self, nslave):
      def run():
          self.accept_slaves(nslave)
  
      self.thread = Thread(target=run, args=())
      self.thread.setDaemon(True)
      self.thread.start()
  
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 10 for calling the RabitTracker obj's underlying member method code with example usage: obj.start(nslave) without return types