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 mmdet.evaluation import CocoMetric
label_desc: Use image node_id 3 for calling the TestCocoMetric obj's underlying member method code with example usage: obj.setUp() without return types