code: def _feature_path(self, dataset_id, image_id):
      if "mscoco" in dataset_id.lower():
          return image_id.rjust(12, "0") + ".npy"
  
      return image_id + ".npy"
  
file_path: mmf/mmf/datasets/builders/localized_narratives/database.py
imports: import json
  from typing import List, NamedTuple, Optional
  from mmf.datasets.databases.annotation_database import AnnotationDatabase
label_desc: Use image node_id 3 for calling the LocalizedNarrativesAnnotationDatabase obj's underlying member method code with example usage: obj._feature_path(dataset_id, image_id) and returns: unknown, unknown