code: def build_annotation_db(self) -> Type[VQACPv2AnnotationDatabase]:
      annotation_path = self._get_path_based_on_index(
          self.config, "annotations", self._index
      )
      return VQACPv2AnnotationDatabase(self.config, annotation_path)
  
file_path: mmf/mmf/datasets/builders/vqacp_v2/dataset.py
imports: import os
  from typing import Type, Union
  import torch
  from mmf.common.sample import Sample
  from mmf.common.typings import MMFDatasetConfigType
  from mmf.datasets.builders.okvqa.dataset import OKVQADataset
  from mmf.datasets.builders.vqacp_v2.database import VQACPv2AnnotationDatabase
label_desc: Use image node_id 2 for calling the VQACPv2Dataset obj's underlying member method code with example usage: obj.build_annotation_db() and returns: VQACPv2AnnotationDatabase