code: def create_kernel(self, num_dims, **kwargs):
      return SpectralMixtureKernel(
          num_mixtures=5, ard_num_dims=num_dims, **kwargs
      )
  
file_path: gpytorch/test/kernels/test_spectral_mixture_kernel.py
imports: import unittest
  import torch
  from gpytorch.kernels import SpectralMixtureKernel
label_desc: Use image node_id 1 for calling the TestSpectralMixtureKernel obj's underlying member method code with example usage: obj.create_kernel(num_dims) and returns: SpectralMixtureKernel