code: def idx_to_answer(self, idx):
      return self.answer_processor.convert_idx_to_answer(idx)
  
file_path: mmf/mmf/datasets/builders/vqa2/dataset.py
imports: import logging
  import torch
  import tqdm
  from mmf.common.sample import Sample
  from mmf.datasets.mmf_dataset import MMFDataset
  from mmf.utils.distributed import is_main
label_desc: Use image node_id 8 for calling the VQA2Dataset obj's underlying member method code with example usage: obj.idx_to_answer(idx) and returns: self