docs: def standardize_snps(G):
      r"""
      Standardize variantes.
  
      Parameters
      ----------
      G : (`n_inds`, `n_snps`) array
          Genetic data
  
      Returns
      -------
      G_out : standardized array
      """
      mean = G.mean(0)
      std = G.std(0)
      return (G - mean) / std