code: def forward(self, x):
      return self.model(x)
  
imports: import os
  import platform
  from unittest import TestCase
  import pytest
  import torch
  from pytorch_lightning import LightningModule
  from test.pytorch.utils._train_torch_lightning import train_with_linear_top_layer
  from test.pytorch.utils._train_torch_lightning import create_data_loader, data_transform
  from bigdl.nano.utils.common import compare_version
  import operator
  from torch import nn
  from bigdl.nano.pytorch import Trainer
  from bigdl.nano.pytorch.vision.models import vision
label_desc: Use image node_id 2 for calling the ResNet18 obj's underlying member method code with example usage: obj.forward(x) and returns: self