code: def forward(self, x):
      return self.bn(x)
  
imports: import torch
  import torch.nn
  from timm.models.layers import DropPath, to_2tuple, trunc_normal_
  from typing import Optional, Callable
label_desc: Use image node_id 2 for calling the VITBatchNorm obj's underlying member method code with example usage: obj.forward(x) and returns: self