def start(self, initialization_hook: Optional[Callable[([], None)]]=None):
    'Starts the worker group.'
    self.worker_group = WorkerGroup(self._num_workers, self._num_cpus_per_worker, self._num_gpus_per_worker)
    if initialization_hook:
        self.worker_group.execute(initialization_hook)
    self._backend.on_start(self.worker_group, self._backend_config)
Starts the worker group.
def start(self, initialization_hook: Optional[Callable[([], None)]]=None):
    
    self.worker_group = WorkerGroup(self._num_workers, self._num_cpus_per_worker, self._num_gpus_per_worker)
    if initialization_hook:
        self.worker_group.execute(initialization_hook)
    self._backend.on_start(self.worker_group, self._backend_config)