class_docstr: Monitor and autorestart a kernel.
docstr: Start the polling of the kernel.
code: def start(self):
      """Start the polling of the kernel."""
      if self._pcallback is None:
          self._pcallback = ioloop.PeriodicCallback(
              self.poll,
              1000 * self.time_to_dead,
          )
          self._pcallback.start()
  
file_path: catboost/contrib/python/jupyter-client/py2/jupyter_client/ioloop/restarter.py
imports: from __future__ import absolute_import
  import warnings
  from zmq.eventloop import ioloop
  from jupyter_client.restarter import KernelRestarter
  from traitlets import Instance
label_desc: Use image node_id 2 for calling the IOLoopKernelRestarter obj's underlying member method code with example usage: obj.start() without return types