code: def _get_mismatching_caption(self, image_id):
      other_item = self.annotation_db[
          random.randint(0, len(self.annotation_db) - 1)
      ]
  
      while other_item["image_id"] == image_id:
          other_item = self.annotation_db[
              random.randint(0, len(self.annotation_db) - 1)
          ]
  
      other_caption = other_item["captions"][
          random.randint(0, len(other_item["captions"]) - 1)
      ]
      return other_caption
  
file_path: mmf/mmf/datasets/builders/coco/masked_dataset.py
imports: import random
  from mmf.common.sample import Sample
  from mmf.datasets.builders.coco import COCODataset
label_desc: Use image node_id 4 for calling the MaskedCOCODataset obj's underlying member method code with example usage: obj._get_mismatching_caption(image_id) and returns: other_caption