code: def __call__(self, x_test):
      distances = np.rint(x_test[None, :] - self.data[:, None])
  
      idx = np.abs(distances) == 0
      distances[idx] = 1 - self.bw
      distances[~idx] = self.bw / (self.num_values - 1)
  
      return distances
  
imports: import numpy
  import scipy.optimize
  import ConfigSpace
  from scipy.special import erf
  from pdb import set_trace
label_desc: Use image node_id 1 for calling the AitchisonAitken obj's underlying member method code with example usage: obj.__call__(x_test) and returns: distances