code: def _get_default_invalidation_mode():
      if os.environ.get("SOURCE_DATE_EPOCH"):
          return PycInvalidationMode.CHECKED_HASH
      else:
          return PycInvalidationMode.TIMESTAMP
  
file_path: catboost/contrib/tools/python3/src/Lib/py_compile.py
imports: import enum
  import importlib._bootstrap_external
  import importlib.machinery
  import importlib.util
  import os
  import os.path
  import sys
  import traceback
label_desc: Use image node_id 1 for calling a global function with example usage: _get_default_invalidation_mode() and returns: PycInvalidationMode, PycInvalidationMode