code: def get_existing_pc_annotations(self):
      return list(
          set(os.listdir(self.pc_root)).intersection(
              set(ann["sample_id"] for ann in self.annotation)
          )
      )
  
file_path: lavis/lavis/datasets/datasets/object3d_qa_datasets.py
imports: import os
  import copy
  import random
  from PIL import Image
  import torch
  from lavis.datasets.datasets.object3d_captioning_datasets import Object3dCaptionDataset
label_desc: Use image node_id 2 for calling the ObjaverseQADataset obj's underlying member method code with example usage: obj.get_existing_pc_annotations() and returns: list