code: def setUp(self):
      self.tmp_dir = tempfile.TemporaryDirectory()
  
imports: import os.path
  import tempfile
  from unittest import TestCase
  import numpy
  import pycocotools.mask
  import torch
  from mmengine.fileio import dump
  from mmengine.structures import BaseDataElement, InstanceData
  from mmdet.evaluation import CocoVideoMetric
  from mmdet.structures import DetDataSample, TrackDataSample
label_desc: Use image node_id 3 for calling the TestCocoVideoMetric obj's underlying member method code with example usage: obj.setUp() without return types