code: def forward(self, x):
      y = self.linear1(x)
      return y.squeeze()
  
imports: from unittest import TestCase
  import operator
  import pytest
  import torch
  from torch.utils.data import TensorDataset, DataLoader, Dataset
  from torch import nn
  import torchmetrics
  from bigdl.nano.pytorch import Trainer
  from bigdl.nano.utils.common import compare_version
label_desc: Use image node_id 2 for calling the ModelWithSingleInput obj's underlying member method code with example usage: obj.forward(x) and returns: y