code: def test_get_permutation(self):
      decomp = {"a": [0, 1], "b": [2, 3]}
      permutation = get_permutation(decomp)
      self.assertIsNone(permutation)
      # order mismatch
      decomp = {"a": [1, 0], "b": [2, 3]}
      permutation = get_permutation(decomp)
      self.assertEqual(permutation, [0, 1, 2, 3])
      # non-contiguous
      decomp = {"a": [0, 2], "b": [1, 3]}
      permutation = get_permutation(decomp)
      self.assertEqual(permutation, [0, 2, 1, 3])
  
file_path: botorch/test/models/kernels/test_contextual.py
imports: import torch
  from botorch.models.kernels.contextual_lcea import get_order, get_permutation, is_contiguous, LCEAKernel
  from botorch.models.kernels.contextual_sac import SACKernel
  from botorch.utils.testing import BotorchTestCase
  from gpytorch.kernels.matern_kernel import MaternKernel
  from torch import Tensor
  from torch.nn import ModuleDict
label_desc: Use image node_id 3 for calling the ContextualKernelTest obj's underlying member method code with example usage: obj.test_get_permutation() without return types