code: def _compute_radii(self):
          
  
          # use supplied radii if present
          radii = self._get_user_components('radii')
  
          # compute radii
          if (radii is None):
              centers = self.components_['centers']
  
              n_centers = centers.shape[0]
              max_dist = np.max(pairwise_distances(centers))
              radii = np.ones(n_centers) * max_dist/sqrt(2.0 * n_centers)
  
          self.components_['radii'] = radii
docs: Generate RBF radii