code: def wait_for_initial_registration(self, timeout):
      self._wait_cond.acquire()
      try:
          while not self._initial_registration_complete:
              self._wait_cond.wait(timeout.remaining())
              timeout.check_time_out_for("tasks to start")
      finally:
          self._wait_cond.release()
  
imports: import abc
  import threading
  from horovod.runner.common import util
  from horovod.runner.common.util import network, safe_shell_exec, timeout
  from horovod.runner.util.streams import Pipe
  from horovod.runner.util.threads import in_thread
label_desc: Use image node_id 6 for calling the BasicTaskService obj's underlying member method code with example usage: obj.wait_for_initial_registration(timeout) without return types