code: def forward(self, x):
      x = self.pre_layers(x)
      x = self.layer1(x)
      x = self.layer2(x)
      x = self.layer3(x)
      x = self.layer4(x)
      x = self.avgpool(x)
      x = x.view(x.size(0), -1)
      x = self.linear(x)
      return x
  
imports: import torch
  import torch.nn
  import torch.nn.functional
label_desc: Use image node_id 3 for calling the PerturbResNet obj's underlying member method code with example usage: obj.forward(x) and returns: x