code: def provision_preprocessing_workers(backend):
      if backend.BACKEND_TYPE == RAY:
          with backend.provision_preprocessing_workers():
              yield
      else:
          yield
  
file_path: ludwig/ludwig/backend/__init__.py
imports: import contextlib
  import logging
  import os
  from ludwig.api_annotations import DeveloperAPI
  from ludwig.backend.base import Backend, LocalBackend
  from ludwig.utils.horovod_utils import has_horovodrun
label_desc: Use image node_id 8 for calling a global function with example usage: provision_preprocessing_workers(backend) without return types