code: def building_rtfd():
      """
      Returns:
          bool: if the library is being imported to generate docs now.
      """
      return os.environ.get("READTHEDOCS") == "True" or os.environ.get(
          "DOC_BUILDING"
      )
  
file_path: tensorpack/tensorpack/utils/develop.py
imports: import functools
  import importlib
  import os
  import types
  from collections import defaultdict
  from datetime import datetime
  import six
  from .None import logger
label_desc: Use image node_id 3 for calling a global function with example usage: building_rtfd() and returns: unknown