code: def forward(self, x):
      x = self.feature_extractor(x)
      return x
  
imports: import torch
  from torch import nn, Tensor
  from torch.jit.annotations import List
  from .res50_backbone import resnet50
  from .utils import dboxes300_coco, Encoder, PostProcess
label_desc: Use image node_id 2 for calling the Backbone obj's underlying member method code with example usage: obj.forward(x) and returns: x