code: def _add_masked_question(self, sample_info, current_sample):
      question = sample_info["question"]
  
      processed = self.masked_token_processor(
          {"text_a": question, "text_b": None, "is_correct": -1}
      )
  
      processed.pop("tokens")
      current_sample.update(processed)
  
      return current_sample
  
file_path: mmf/mmf/datasets/builders/visual_genome/masked_dataset.py
imports: from mmf.common.sample import Sample
  from mmf.datasets.mmf_dataset import MMFDataset
label_desc: Use image node_id 5 for calling the MaskedVisualGenomeDataset obj's underlying member method code with example usage: obj._add_masked_question(sample_info, current_sample) and returns: current_sample