code: def initialize_horovod():
      if not _HVD:
          raise ValueError(
              "Horovod backend specified, "
              "but cannot import `horovod.torch`. "
              "Install Horovod following the instructions at: "
              "https://github.com/horovod/horovod"
          )
      _HVD.init()
      return _HVD
  
imports: import os
  from typing import Any, List, Optional
  import torch
label_desc: Use image node_id 1 for calling a global function with example usage: initialize_horovod() and returns: _HVD