复制 my_useless_scaler=preprocessing.StandardScaler(with_mean=False,with_std=False)#可关闭 transformed_sd=my_useless_scale.fit_transform(X[:,:3]).std(axis=0)original_sd=X[:,:3].std(axis=0)np.array_equal(transformed_sd,original_sd)True Handling sparse imputations处理稀疏缺失值 Sparse matrice...