code: def __del__(self):
      if self.bn_group > 1:
          bnp.close_remote_data(self.pair_handle)
          if self.bn_group > 2:
              bnp.close_remote_data(self.pair_handle2)
              if self.bn_group > 4:
                  bnp.close_remote_data(self.pair_handle3)
  
file_path: apex/apex/contrib/groupbn/batch_norm.py
imports: import torch
  import numpy
  from torch.nn.modules.batchnorm import _BatchNorm
  import bnp
label_desc: Use image node_id 3 for calling the BatchNorm2d_NHWC obj's underlying member method code with example usage: obj.__del__() without return types