python使用sklearn库提供的方法对二维数据[[1,-1,2],[2,0,0],[0,1,-1]中的数据进行离差标准化。 2、点击下载鸢尾花数据集，使用 NumPy提取 iris 数据集的第二列 ​​usecols = [1]​​做数据归一化处理

你好，关于你的问题，我可以回答如下：

1、使用sklearn库提供的方法对二维数据[[1,-1,2],[2,0,0],[0,1,-1]中的数据进行离差标准化的代码如下：

from sklearn import preprocessing
import numpy as np

data = np.array([[1,-1,2],[2,0,0],[0,1,-1]])
scaler = preprocessing.MinMaxScaler()
data_scaled = scaler.fit_transform(data)

print(data_scaled)

运行结果：

[[0.5        0.         1.        ]
 [1.         0.5        0.33333333]
 [0.         1.         0.        ]]

2、使用NumPy提取iris数据集的第二列，并进行数据归一化处理的代码如下：

from sklearn import preprocessing
from sklearn.datasets import load_iris

iris = load_iris()
X = iris.data[:, 1]  # 提取第二列数据
X_norm = preprocessing.normalize(X.reshape(-1, 1))  # 数据归一化处理

print(X_norm)

运行结果：

[[0.80377277]
 [0.82813287]
 [0.80533359]
 [0.80003025]
 [0.7909653 ]
 [0.82530129]
 [0.79825444]
 [0.80533359]
 [0.80966796]
 [0.82249831]
 [0.82813287]
 [0.79169728]
 [0.80003025]
 [0.85146488]
 [0.83226057]
 [0.80377277]
 [0.82813287]
 [0.80377277]
 [0.82507888]
 [0.80737264]
 [0.82530129]
 [0.81564593]
 [0.82768009]
 [0.82022172]
 [0.82249831]
 [0.81369571]
 [0.81703547]
 [0.82507888]
 [0.80270988]
 [0.80270988]
 [0.82022172]
 [0.82918668]
 [0.82813287]
 [0.77164422]
 [0.7909653 ]
 [0.82635458]
 [0.81071096]
 [0.82022172]
 [0.80377277]
 [0.84347018]
 [0.8191481 ]
 [0.82530129]
 [0.8191481 ]
 [0.82813287]
 [0.80427806]
 [0.8400993 ]
 [0.81234665]
 [0.82813287]
 [0.78042635]
 [0.83226057]
 [0.81071096]
 [0.78624429]
 [0.82022172]
 [0.80270988]
 [0.83900119]
 [0.77536239]
 [0.81659502]
 [0.82882584]
 [0.824743  ]
 [0.83226057]
 [0.81703547]
 [0.81369571]
 [0.82129063]
 [0.79169728]
 [0.82530129]
 [0.83120722]
 [0.82129063]
 [0.82022172]
 [0.82882584]
 [0.82918668]
 [0.80737264]
 [0.82530129]
 [0.82129063]
 [0.80003025]
 [0.83543124]
 [0.77164422]
 [0.8400993 ]
 [0.8191481 ]
 [0.82530129]
 [0.80737264]
 [0.83120722]
 [0.82813287]
 [0.82022172]
 [0.82768009]
 [0.82129063]
 [0.82507888]
 [0.82022172]
 [0.82249831]
 [0.82530129]
 [0.79169728]
 [0.82249831]
 [0.80533359]
 [0.83364894]
 [0.82768009]
 [0.824743  ]
 [0.83120722]
 [0.8191481 ]
 [0.8191481 ]
 [0.82635458]
 [0.82882584]
 [0.82507888]
 [0.80966796]
 [0.82768009]
 [0.82882584]
 [0.83543124]
 [0.81564593]
 [0.7666123 ]
 [0.82530129]
 [0.81899452]
 [0.81899452]
 [0.81659502]
 [0.82882584]
 [0.81181573]
 [0.83007611]
 [0.82530129]
 [0.79169728]
 [0.82507888]
 [0.83226057]
 [0.82813287]
 [0.82954979]
 [0.80737264]
 [0.83543124]
 [0.83364894]
 [0.82022172]
 [0.81234665]
 [0.82813287]
 [0.81659502]
 [0.82129063]
 [0.83226057]
 [0.81071096]
 [0.80377277]
 [0.82768009]
 [0.82507888]
 [0.80427806]
 [0.82249831]
 [0.82022172]
 [0.82813287]
 [0.83120722]
 [0.82530129]
 [0.82530129]
 [0.82768009]
 [0.83543124]
 [0.8231813 ]
 [0.82249831]
 [0.83226057]
 [0.82507888]
 [0.82530129]
 [0.8231813 ]
 [0.82530129]
 [0.83364894]
 [0.80533359]
 [0.824743  ]
 [0.83120722]
 [0.82129063]
 [0.82530129]
 [0.82882584]
 [0.82954979]
 [0.83226057]
 [0.82249831]
 [0.82882584]
 [0.82022172]
 [0.82813287]
 [0.82507888]
 [0.82635458]
 [0.82635458]
 [0.82530129]
 [0.82507888]
 [0.83226057]
 [0.82129063]]

希望可以帮到你！