code: def get_video_path(self, sample_key):
      return os.path.join(self.video_root, sample_key) + ".mp4"
  
imports: import torch
  import os
  import copy
  import random
  from PIL import Image
  from lavis.datasets.datasets.dialogue_datasets import DialogueDataset, DialogueEvalDataset
label_desc: Use image node_id 5 for calling the AVSDDialInstructEvalDataset obj's underlying member method code with example usage: obj.get_video_path(sample_key) and returns: unknown