Calculate model performance indexes.

def cal_model_performance(obsl, siml):
    """Calculate model performance indexes."""
    nse = MathClass.nashcoef(obsl, siml)
    r2 = MathClass.rsquare(obsl, siml)
    rmse = MathClass.rmse(obsl, siml)
    pbias = MathClass.pbias(obsl, siml)
    rsr = MathClass.rsr(obsl, siml)
    print('NSE: %.2f, R-square: %.2f, PBIAS: %.2f%%, RMSE: %.2f, RSR: %.2f' %
          (nse, r2, pbias, rmse, rsr))