code: def __len__(self) -> int:
      return len(self.data) if self.data is not None else 0
  
imports: import functools
  import os
  from enum import Enum
  from typing import Any, Dict, Iterable, List, Sequence, Tuple, Union, cast
  from pytorch_lightning.utilities.enums import LightningEnum
  from torch.utils.data import Dataset
  from flash.core.data.properties import Properties
  from flash.core.data.utils import _STAGES_PREFIX
  from flash.core.utilities.stages import RunningStage
label_desc: Use image node_id 2 for calling the Input obj's underlying member method code with example usage: obj.__len__() and returns: unknown