code: def forward(ctx, X):
      return 2 * X
  
file_path: botorch/test/utils/test_rounding.py
imports: import torch
  from botorch.utils.rounding import approximate_round, IdentitySTEFunction, OneHotArgmaxSTE, RoundSTE
  from botorch.utils.testing import BotorchTestCase
  from torch.nn.functional import one_hot
label_desc: Use image node_id 1 for calling the DummySTEFunction obj's underlying member method code with example usage: obj.forward(ctx, X) and returns: unknown