code: def features(self, input_):
      x = self.conv1(input_)
      self.conv1_input = x.clone()
      x = self.bn1(x)
      x = self.relu(x)
      x = self.maxpool(x)
  
      x = self.layer1(x)
      x = self.layer2(x)
      x = self.layer3(x)
      x = self.layer4(x)
      return x
  
imports: import torch.nn
  import torch.nn.functional
  import math
  import torch.utils.model_zoo
label_desc: Use image node_id 3 for calling the FBResNet obj's underlying member method code with example usage: obj.features(input_) and returns: x