code: def aitchison_aitken_convolution(h, Xi, Xj):
      Xi_vals = np.unique(Xi)
      ordered = np.zeros(Xi.size)
      num_levels = Xi_vals.size
      for x in Xi_vals:
          ordered += aitchison_aitken(
              h, Xi, x, num_levels=num_levels
          ) * aitchison_aitken(h, Xj, x, num_levels=num_levels)
  
      return ordered
  
file_path: statsmodels/statsmodels/nonparametric/kernels.py
imports: import numpy
  from scipy.special import erf
label_desc: Use image node_id 7 for calling a global function with example usage: aitchison_aitken_convolution(h, Xi, Xj) and returns: ordered