code: def forward(self, x):
      x = self.conv1(x)
      x = self.bn1(x)
      x = self.relu(x)
      x = self.maxpool(x)
  
      x2 = self.layer1(x)
      x3 = self.layer2(x2)
      x4 = self.layer3(x3)
      x5 = self.layer4(x4)
  
      return x2, x3, x4, x5
  
imports: import torch.nn
  import math
  import torch.utils.model_zoo
label_desc: Use image node_id 3 for calling the ResNet obj's underlying member method code with example usage: obj.forward(x) and returns: x2,  x3,  x4,  x5