code: def forward(self, net: Tensor) -> Tensor:
      return self.net(net)
  
imports: import torch
  from torch import nn
  from torch import Tensor
  from ..misc.toolkit import download_model
  from ..misc.toolkit import set_requires_grad
  from ..modules.blocks import HijackConv2d
label_desc: Use image node_id 2 for calling the ChannelMapping obj's underlying member method code with example usage: obj.forward(net) and returns: self