code: def backend_is_pw() -> bool:
      """Return True if environment indicates the backend is Pathways."""
      return os.environ.get("DTENSOR_USE_PARALLEL_EXECUTOR") == "pw"
  
imports: import os
  from typing import List, Optional, Union
  from tensorflow.python.eager import context
  from tensorflow.python.framework import config
  from tensorflow.python.framework import device
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 17 for calling a global function with example usage: backend_is_pw() and returns: unknown