code: def _lazy_import_pandas() -> LazyModule:
      global _pandas
      if _pandas is None:
          try:
              import pandas as _pandas
          except ModuleNotFoundError:
              # If module is not found, set _pandas to False so we won't
              # keep trying to import it on every _lazy_import_pandas() call.
              _pandas = False
      return _pandas
  
file_path: ray/python/ray/data/_internal/null_aggregate.py
imports: from types import ModuleType
  from typing import Any, Callable, Tuple, Union
  import numpy
  from ray.data.block import AggType, Block, KeyType, T, U
label_desc: Use image node_id 8 for calling a global function with example usage: _lazy_import_pandas() and returns: _pandas