code: def batch_norm(num_channels: int) -> BatchNorm2d:
      return BatchNorm2d(num_channels)
  
imports: from typing import Union, Sequence, Callable
  import torch
  from torch.nn import Module, Sequential, BatchNorm2d, Conv2d, ReLU, ConstantPad3d, Identity, AdaptiveAvgPool2d, Linear
  from torch import Tensor
  from torch.nn.init import zeros_, kaiming_normal_
  from torch.nn.modules.flatten import Flatten
  import torch.nn.functional
label_desc: Use image node_id 2 for calling a global function with example usage: batch_norm(num_channels) and returns: BatchNorm2d