code: def test_EnsemblePosterior_invalid(self):
      for shape, dtype in itertools.product(
          ((5, 2), (5, 1)), (torch.float, torch.double)
      ):
          values = torch.randn(*shape, device=self.device, dtype=dtype)
          with self.assertRaisesRegex(
              ValueError,
              "Values has to be at least three-dimensional",
          ):
              EnsemblePosterior(values)
  
file_path: botorch/test/posteriors/test_ensemble.py
imports: import itertools
  import torch
  from botorch.posteriors.ensemble import EnsemblePosterior
  from botorch.utils.testing import BotorchTestCase
label_desc: Use image node_id 1 for calling the TestEnsemblePosterior obj's underlying member method code with example usage: obj.test_EnsemblePosterior_invalid() without return types