code: def _has_ray():
      # Temporary workaround to prevent tests from automatically using the Ray backend. Taken from
      # https://stackoverflow.com/questions/25188119/test-if-code-is-executed-from-within-a-py-test-session
      if "PYTEST_CURRENT_TEST" in os.environ:
          return False
  
      try:
          import ray
      except ImportError:
          return False
  
      if ray.is_initialized():
          return True
  
      try:
          ray.init("auto", ignore_reinit_error=True)
          return True
      except Exception:
          return False
  
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 1 for calling a global function with example usage: _has_ray() and returns: False, True, True, False, False