code: def forward(self, x: torch.Tensor) -> torch.Tensor:
      return x
  
file_path: botorch/test/sampling/pathwise/test_paths.py
imports: from __future__ import annotations
  import torch
  from botorch.exceptions.errors import UnsupportedError
  from botorch.sampling.pathwise.paths import PathDict, PathList, SamplePath
  from botorch.utils.testing import BotorchTestCase
  from torch.nn import ModuleDict, ModuleList
label_desc: Use image node_id 1 for calling the IdentityPath obj's underlying member method code with example usage: obj.forward(x) and returns: x