code: def config_path(cls):
      return "configs/datasets/mmimdb/masked.yaml"
  
imports: from mmf.common.registry import registry
  from mmf.datasets.builders.mmimdb.masked_dataset import MaskedMMImdbDataset
  from mmf.datasets.builders.vqa2.builder import VQA2Builder
label_desc: Use image node_id 2 for calling the MaskedMMImdbBuilder obj's underlying member method code with example usage: obj.config_path(cls) and returns: str