code: def get_audio_path(self, ann, entity_index):
      if self.ds_name == "audiocaps":
          return str(
              os.path.join(
                  self.audio_root,
                  ann["sample_ids"][entity_index]
                  + "_{}.flac".format(
                      int(ann["start_seconds"][entity_index])
                  ),
              )
          )
  
imports: import os
  from collections import OrderedDict
  from PIL import Image
  import copy
  from lavis.datasets.datasets.base_dataset import BaseDataset
  from lavis.common.utils import is_serializable
label_desc: Use image node_id 5 for calling the DisCRnDataset obj's underlying member method code with example usage: obj.get_audio_path(ann, entity_index) and returns: str