code: def _default(value: _Value) -> Any:
      """Checks if value is set in the environment."""
      return os.getenv(value.name, default=value.value)
  
imports: import contextlib
  import os
  from dataclasses import dataclass, field, replace
  from typing import Any, Dict, Generator, List, Mapping, Optional, Union
  import numpy
  import tabulate
  import tensorflow
  import tensorflow_probability
label_desc: Use image node_id 1 for calling a global function with example usage: _default(value) and returns: os