code: def num_classes(self):
      return 10
  
imports: import argparse
  import os
  from typing import Any, List
  import numpy
  import structlog
  import torch
  import torch.backends
  from pytorch_lightning import seed_everything
  from pytorch_lightning.loggers import TensorBoardLogger
  from pytorch_lightning.trainer.progress import Progress
  from pytorch_lightning.trainer.states import TrainerFn, TrainerStatus, RunningStage
  from pytorch_lightning.utilities.exceptions import MisconfigurationException
  from torch import nn
  from torchvision import datasets
  from torchvision.transforms import transforms
  from functools import partial
  from flash.image import ImageClassifier, ImageClassificationData
  from flash.core.classification import Logits
  from flash.image.classification.integrations.baal import ActiveLearningDataModule, ActiveLearningLoop
  from baal.active import get_heuristic
label_desc: Use image node_id 1 for calling the DataModule_ obj's underlying member method code with example usage: obj.num_classes() and returns: int