code: def close(self):
      self._reset()
  
imports: import os
  import time
  import hashlib
  import numpy
  import tensorflow
  import dnnlib
  import dnnlib.tflib
  from training import misc
  from training import dataset
label_desc: Use image node_id 2 for calling the MetricBase obj's underlying member method code with example usage: obj.close() without return types