code: def zero_init_last_bn(self):
      nn.init.zeros_(self.conv3.bn.weight)
  
imports: from typing import Optional
  import numpy
  import torch
  import torch.nn
  from torch import Tensor
label_desc: Use image node_id 2 for calling the Bottleneck obj's underlying member method code with example usage: obj.zero_init_last_bn() without return types