code: def absolute_extreme_coefficient_ratio(model):
      
      s_matrix, _, _ = con_helpers.stoichiometry_matrix(
          model.metabolites, model.reactions
      )
      abs_matrix = np.abs(s_matrix)
      return abs_matrix.max(), abs_matrix[abs_matrix > 0].min()
docs: Return the maximum and minimum absolute, non-zero coefficients.
  
      Parameters
      ----------
      model : cobra.Model
          The metabolic model under investigation.