@staticmethod
def get_miscl(y, y_pred):
    """get misclassified samples"""
    FN = y[y == 1].loc[y[y == 1] != y_pred[y == 1],].index
    FP = y[y == 0].loc[y[y == 0] != y_pred[y == 0],].index
    return FN.tolist() + FP.tolist()
