code: def freeze_bn(self):
      for m in self.modules():
          if isinstance(m, nn.BatchNorm2d):
              m.eval()
  
file_path: pywick/pywick/models/segmentation/testnets/lg_kernel_exfuse/large_kernel.py
imports: import torch
  from torch import nn
  from .deeplab_resnet import ModelBuilder
label_desc: Use image node_id 3 for calling the GCN obj's underlying member method code with example usage: obj.freeze_bn() without return types