code: def _get_pad(self, kernel_size):
      if kernel_size == 1:
          return 0
      elif kernel_size == 3:
          return 1
      elif kernel_size == 5:
          return 2
      elif kernel_size == 7:
          return 3
      else:
          raise NotImplementedError
  
imports: from __future__ import division
  import numpy
  from mxnet.gluon import nn
  from mxnet.gluon.nn import BatchNorm
  from mxnet.gluon.block import HybridBlock
  from mxnet.context import cpu
  from ..nn import ReLU6, HardSigmoid, HardSwish
label_desc: Use image node_id 3 for calling the _ResUnit obj's underlying member method code with example usage: obj._get_pad(kernel_size) and returns: int, int, int, int