code: def sample(self, sample_indices=None, num_samples=1):
      raise NotImplementedError
  
imports: import numpy
  import scipy.optimize
  import ConfigSpace
  from scipy.special import erf
  from pdb import set_trace
label_desc: Use image node_id 5 for calling the BaseKernel obj's underlying member method code with example usage: obj.sample(sample_indices, num_samples) without return types