code: def command_terminated(self):
      resp = self._send(CommandTerminatedRequest())
      return resp.flag
  
imports: import threading
  import time
  from bluefog.run.horovodrun.common.util import network
  from bluefog.run.horovodrun.common.util import safe_shell_exec
label_desc: Use image node_id 4 for calling the BasicTaskClient obj's underlying member method code with example usage: obj.command_terminated() and returns: resp