code: def _build_class_labels(self):
      return {"no": 0, "yes": 1}
  
imports: import os
  import json
  from PIL import Image
  from PIL import ImageFile
  from lavis.datasets.datasets.multimodal_classification_datasets import MultimodalClassificationDataset
  from lavis.datasets.datasets.base_dataset import BaseDataset
label_desc: Use image node_id 2 for calling the VSRClassificationDataset obj's underlying member method code with example usage: obj._build_class_labels() and returns: dict