class_docstr: Demo module to use in doctests
code: def forward(self, x):
      x = self.f(x)
      return x
  
file_path: opacus/conftest.py
imports: import pytest
  import torch
  from opacus import PrivacyEngine
  from torch import nn
  from torch.utils.data import DataLoader, TensorDataset
label_desc: Use image node_id 2 for calling the MyCustomModel obj's underlying member method code with example usage: obj.forward(x) and returns: x