code: def _forward_impl(self, x):
      # This exists since TorchScript doesn't support inheritance, so the superclass method
      # (this one) needs to have a name other than `forward` that can be accessed in a subclass
      fpn_features = []
      for i, f in enumerate(self.features):
          if i > self.fpn_selected[-1]:
              break
          x = f(x)
          if i in self.fpn_selected:
              fpn_features.append(x)
  
      c2, c3, c4 = fpn_features
      return c2, c3, c4
  
imports: import os
  import sys
  import torch
  import torch.nn
  import torch.utils.model_zoo
  from torch.nn import functional
label_desc: Use image node_id 2 for calling the MobileNetV2 obj's underlying member method code with example usage: obj._forward_impl(x) and returns: c2,  c3,  c4