code: def forward(self, x: Tensor) -> Tensor:
      assert self.linear is not None
      if self.norm is not None:
          x = self.norm(x)
      return self.linear(x)
  
imports: from typing import Callable, cast, List, Optional
  import torch.nn
  from captum._utils.models.model import Model
  from torch import Tensor
  from torch.utils.data import DataLoader
label_desc: Use image node_id 4 for calling the LinearModel obj's underlying member method code with example usage: obj.forward(x) and returns: self