docstr: vis_root (string): Root directory of videos.
  ann_root (string): directory to store the annotation file
docstr_tok: ["vis_root","(","string",")",":","Root","directory","of","videos",".","ann_root","(","string",")",":","directory","to","store","the","annotation","file"]
code: def __init__(
      self, vis_processor, text_processor, vis_root, ann_paths
  ):
      """
      vis_root (string): Root directory of videos.
      ann_root (string): directory to store the annotation file
      """
      super().__init__(
          vis_processor, text_processor, vis_root, ann_paths
      )
  
      self.img_ids = {}
      n = 0
      for ann in self.annotation:
          img_id = ann["video"]
          if img_id not in self.img_ids.keys():
              self.img_ids[img_id] = n
              n += 1
  
imports: import os
  from collections import OrderedDict
  from lavis.datasets.datasets.base_dataset import BaseDataset
  from PIL import Image
label_desc: Use image node_id 1 to create a new VideoRetrievalDataset object from inherited base classes: BaseDataset, __DisplMixin with example: obj = VideoRetrievalDataset(vis_processor, text_processor, vis_root, ann_paths)