class_docstr: Configurations for Horovod setup.
  
  See https://github.com/horovod/horovod/blob/master/horovod/runner/common/util/settings.py # noqa: E501
  
  Args:
      nics (Optional[Set[str]): Network interfaces that can be used for
          communication.
      verbose: Horovod logging verbosity.
      key (Optional[str]): Secret used for communication between workers.
      ssh_port (Optional[int]): Port for SSH server running on worker nodes.
      ssh_identity_file (Optional[str]): Path to the identity file to
          ssh into different hosts on the cluster.
      ssh_str (Optional[str]): CAUTION WHEN USING THIS. Private key
          file contents. Writes the private key to ssh_identity_file.
      timeout_s: Timeout parameter for Gloo rendezvous.
      placement_group_timeout_s: Timeout parameter for Ray
          Placement Group creation. Currently unused.
code: def start_timeout(self):
      return timeout.Timeout(
          self.timeout_s,
          message="Timed out waiting for {activity}. Please "
          "check connectivity between servers. You "
          "may need to increase the --start-timeout "
          "parameter if you have too many servers.",
      )
  
imports: import os
  from dataclasses import dataclass
  from typing import Optional, Set
  from horovod.ray.runner import Coordinator
  from horovod.ray.utils import detect_nics, nics_to_env_var
  from horovod.runner.common.util import secret, timeout
  import ray
  from ray.train._internal.utils import update_env_vars
  from ray.train._internal.worker_group import Worker, WorkerGroup
  from ray.train.backend import Backend, BackendConfig
  from ray.util import PublicAPI
label_desc: Use image node_id 1 for calling the HorovodConfig obj's underlying member method code with example usage: obj.start_timeout() and returns: timeout