X, y = mglearn.datasets.make_forge() mglearn.plots.plot_linear_regression_wave() from sklearn.linear_model import LinearRegression X, y = mglearn.datasets.make_wave(n_samples=60) X_train, X_test, y_train, y_test = train_test_split(X, y, random_state=42) lr = LinearRegression().fit(X_train, y_train) print("lr.coef_: {}".format(lr.coef_)) print("lr.intercept_: {}".format(lr.intercept_)) print("Training set score: {}".format(lr.score(X_train, y_train))) print("Test set score: {}".format(lr.score(X_test, y_test))) X, y = mglearn.datasets.load_extended_boston() X_train, X_test, y_train, y_test = train_test_split(X, y, random_state=0) lr = LinearRegression().fit(X_train, y_train) print("Training set score: {}".format(lr.score(X_train, y_train))) print("Test set score: {}".format(lr.score(X_test, y_test))) 对该段代码做出详细解释

1. 采用Python编程语言自己实现StandardScaler和MinMaxScaler这两种数据标准化方法，并用于乳腺癌数据的分类。要求模型预测的准确率结果必须与以下sklearn的一样： from sklearn.datasets import load_breast_cancer from sklearn.model_selection import train_test_split cancer = load_breast_cancer() X = cancer.data y = cancer.target X_train, X_test, y_train, y_test = train_test_split(X, y, random_state=0, test_size=0.3) from sklearn.preprocessing import MinMaxScaler from sklearn.preprocessing import StandardScaler scaler = StandardScaler() #scaler = MinMaxScaler() scaler.fit(X_train) X_train_scaled = scaler.transform(X_train) X_test_scaled = scaler.transform(X_test) from sklearn.linear_model import LogisticRegression logreg=LogisticRegression() logreg.fit(X_train_scaled, y_train) y_pred = logreg.predict(X_test_scaled) from sklearn.metrics import accuracy_score accuracy_score(y_test, y_pred)

from sklearn.linear_model import LogisticRegression logreg = LogisticRegression() logreg.fit(X_train_scaled, y_train) y_pred = logreg.predict(X_test_scaled) # 计算准确率 from sklearn.metrics import ...

解释如下代码：import numpy as np import matplotlib.pyplot as plt from sklearn.linear_model import LinearRegression from sklearn.datasets import make_regression from sklearn.model_selection import train_test_split from sklearn.preprocessing import StandardScaler from sklearn.metrics import mean_squared_error

3. sklearn.linear_model：Scikit-Learn 库中的线性回归模型。 4. sklearn.datasets：Scikit-Learn 库中的数据集生成工具。 5. sklearn.model_selection：Scikit-Learn 库中的模型选择工具，用于数据集的...

from sklearn.datasets import load_iris from sklearn.model_selection import train_test_split from sklearn.linear_model import LogisticRegression from sklearn.neighbors import KNeighborsClassifier from sklearn.model_selection import cross_val_score iris = load_iris() X = iris.data y = iris.target knn = KNeighborsClassifier(n_neighbors=20) print(cross_val_score(knn, X, y, cv=10, scoring='accuracy').mean()) # 0.9800000000000001 logreg = LogisticRegression() print(cross_val_score(logreg, X, y, cv=10, scoring='accuracy').mean()) # 0.9733333333333334

这段代码使用了sklearn库中的load_iris()函数加载了鸢尾花数据集，将数据集分为特征数据X和目标数据y。接着，使用KNeighborsClassifier和LogisticRegression两种不同的分类器进行交叉验证，并输出了准确率的平均值。...

from sklearn.datasets import load_iris from sklearn.linear_model import LogisticRegression from sklearn.model_selection import train_test_split from sklearn.metrics import accuracy_score iris = load_iris() X = iris.data y = iris.target X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.3, random_state=42) # 使用 'multinomial' 多分类方法 model2 = LogisticRegression(multi_class='multinomial', solver='lbfgs') model2.fit(X_train, y_train) y_pred2 = model2.predict(X_test) acc2 = accuracy_score(y_test, y_pred2) print('Accuracy score using "multinomial" method:', acc2)修改该程序使上述程序数据可视化

from sklearn.linear_model import LogisticRegression from sklearn.model_selection import train_test_split from sklearn.metrics import accuracy_score from sklearn.decomposition import PCA # 加载数据并...

from sklearn import datasets from sklearn.model_selection import train_test_split from sklearn.linear_model import LinearRegression from sklearn.metrics import mean_squared_error b_datas = datasets.load_boston() 为什么报错？

model = LinearRegression() model.fit(X_train, y_train) y_pred = model.predict(X_test) mse = mean_squared_error(y_test, y_pred) print("Mean squared error: ", mse) 这些代码可以将数据集划分为训练集...

Traceback (most recent call last): File "C:\Users\Laowang\Desktop\Python机器学习基础教程\2.3.1.py", line 3, in <module> import mglearn.datasets File "E:\python_test\Lib\site-packages\mglearn\init.py", line 1, in <module> from . import plots File "E:\python_test\Lib\site-packages\mglearn\plots.py", line 5, in <module> from .plot_knn_regression import plot_knn_regression File "E:\python_test\Lib\site-packages\mglearn\plot_knn_regression.py", line 7, in <module> from .datasets import make_wave File "E:\python_test\Lib\site-packages\mglearn\datasets.py", line 5, in <module> from sklearn.datasets import load_boston File "E:\python_test\Lib\site-packages\sklearn\datasets\init.py", line 156, in getattr raise ImportError(msg) ImportError: load_boston has been removed from scikit-learn since version 1.2.

这是一个错误信息，提示你在使用scikit-learn库的load_boston函数时出现问题。load_boston函数在Scikit-learn版本1.2之后已被移除，因此你需要升级Scikit-learn库或者使用其他函数来加载波士顿房价数据集。...

import matplotlib.pyplot as plt from sklearn.datasets import load_boston from sklearn.model_selection import cross_val_score from sklearn.linear_model import LinearRegression from sklearn.metrics import mean_squared_error import pandas as pd

这段代码是用来导入所需的Python库，包括matplotlib用于数据可视化，load_boston用于加载波士顿房价数据集，cross_val_score和LinearRegression用于模型训练和评估，mean_squared_error用于计算均方误差，pandas用于...

from sklearn.datasets import load_iris iris = load_iris() from sklearn.model_selection import train_test_split from sklearn.linear_model import LogisticRegression model = LogisticRegression(solver='lbfgs', multi_class='multinomial') model.fit(x_train, y_train) y_pred = model.predict( X_test ) p_pred = model.predict_proba( X_test ) print( y_test, '\n' ) print( y_pred, '\n' ) print( p_pred )未定义“x_train”未定义“y_train”未定义“X_test”未定义“y_test”

from sklearn.linear_model import LogisticRegression iris = load_iris() X_train, X_test, y_train, y_test = train_test_split(iris.data, iris.target, test_size=0.2, random_state=42) model = Logistic...

import numpy as np import pandas as pd import matplotlib.pyplot as plt from sklearn.datasets import load_iris from sklearn.linear_model import LogisticRegression iris=load_iris() print(iris)y = iris.target # 得到数据对应的标签 x = pd.DataFrame(data=iris.data, columns=iris.feature_names) # 利用Pandas转化为DataFrame格式 x.head()有什么问题吗

from sklearn.linear_model import LogisticRegression iris = load_iris() print(iris) y = iris.target # 得到数据对应的标签 x = pd.DataFrame(data=iris.data, columns=iris.feature_names) # 利用Pandas转化...

在Python中想运行from sklearn.model_selection import train_test_split from sklearn.decomposition import PCA import pandas as pd from sklearn import svm import numpy as np import math import matplotlib.pyplot as plt import matplotlib as mpl from matplotlib import colors from sklearn.model_selection import train_test_split from sklearn import datasets from matplotlib.colors import ListedColormap from sklearn.svm import SVC from sklearn.preprocessing import StandardScaler from sklearn.model_selection import StratifiedShuffleSplit,StratifiedKFold from sklearn.model_selection import GridSearchCV from sklearn.model_selection import GridSearchCV, LeaveOneOut, cross_val_predict from sklearn.model_selection import KFold from sklearn.linear_model import LogisticRegression from sklearn.naive_bayes import GaussianNB from sklearn.neighbors import KNeighborsClassifier from sklearn import svm from sklearn.tree import DecisionTreeClassifier from sklearn.ensemble import RandomForestClassifier from sklearn.metrics import roc_auc_score from sklearn.metrics import roc_auc_score import math import datetime import multiprocessing as mp from sklearn.ensemble import StackingClassifier from sklearn.pipeline import make_pipeline from sklearn.svm import LinearSVC import random怎么操作

from sklearn.linear_model import LogisticRegression from sklearn.naive_bayes import GaussianNB from sklearn.neighbors import KNeighborsClassifier from sklearn.tree import DecisionTreeClassifier from ...

from sklearn.datasets import load_iris from sklearn.cluster import KMeans # 加载莺尾花数据集 iris = load_iris() X = iris.data # 创建 KMeans 模型并拟合数据 kmeans = KMeans(n_clusters=3, random_state=0) kmeans.fit(X) # 打印簇中心点的坐标 print(kmeans.cluster_centers_) # 打印每个数据点所属的簇 print(kmeans.labels_) from sklearn.datasets import load_iris from sklearn.tree import DecisionTreeClassifier from sklearn.tree import plot_tree import matplotlib.pyplot as plt # 加载莺尾花数据集 iris = load_iris() X = iris.data y = iris.target # 创建决策树分类器并拟合数据 clf = DecisionTreeClassifier(random_state=0) clf.fit(X, y) # 绘制决策树 plt.figure(figsize=(20,10)) plot_tree(clf, filled=True) plt.show(),怎么调整决策树图片大小

from sklearn.datasets import load_iris from sklearn.tree import DecisionTreeClassifier from sklearn.tree import plot_tree import matplotlib.pyplot as plt # 加载莺尾花数据集 iris = load_iris() X = ...

from sklearn.datasets import load_iris data,target=load_iris(return_X_y=True) print('feature_value:',data.shape) print('target:',target) from sklearn.cluster import KMeans import numpy as np for i in range(0,30): kmeans=KMeans(n_clusters=3,max_iter=30,tol=0.0001, random_state=i).fit(data) label=kmeans.labels_ #print('label:',label) center=kmeans.cluster_centers_ #print('center:',center) predict=kmeans.predict(data) print('i=',i) print('predict:',predict) accuracy=np.mean(predict==target)100 print('accuracy',accuracy) #模型预测 predict=kmeans.predict(data) print('predict:',predict) import numpy as np accurancy=np.mean(predict==target)100 print('i=',i) print('accurancy',accurancy) import matplotlib.pyplot as plt import mglearn plt.figure(figsize=(10,8)) plt.subplot(221) mglearn.discrete_scatter(data[:,0],data[:,1],target,markers='^') plt.xlabel('data') plt.ylabel('origin') plt.subplot(222) mglearn.discrete_scatter(data[:,0],data[:,1],y_predict,markers='^') mglearn.discrete_scatter(kmeans.cluster_centers_[:,0],kmeans.cluster_centers_[:,1],[0,1,2],markers='o',markeredgewidth=2) plt.xlabel('data') plt.ylabel('y_predict') plt.show()写一下注释

from sklearn.datasets import load_iris data,target=load_iris(return_X_y=True) 2. 输出特征值和目标值的形状： python print('feature_value:',data.shape) print('target:',target) 3. 导入...

如何用我的.csv文件替换下列代码中的数据集，其中我的.csv文件是一个列数加上四个变量的五列数据，代码如下 #code-4-4.py #Multiple Linear Regression from sklearn.datasets import load_boston from sklearn.linear_model import LinearRegression import matplotlib.pyplot as plt from sklearn. model_selection import train_test_split dataset = load_boston() x_data = dataset.data # 导入所有特征变量 y_data = dataset.target # 导入目标值（房价） name_data = dataset.feature_names #导入特征 x_train,x_test,y_train,y_test = train_test_split(x_data, y_data,test_size= 0.25,random_state= 1001) mlr_model = LinearRegression() #创建线性回归估计器实例 mlr_model.fit(x_train,y_train)#用训练数据拟合模型 y_test_p = mlr_model.predict(x_test)#用训练的模型对测试集进行预测 plt.subplot(1, 1, 1) plt.scatter(x_test[:,5],y_test,s = 20, color="r") plt.scatter(x_test[:,5],y_test_p,s = 20, color="b") plt.xlabel('Room Number') plt.ylabel('Price') plt.title(name_data[5]) plt.show() r_squared = mlr_model.score(x_test, y_test) print('R2 = %s' %r_squared )

from sklearn.linear_model import LinearRegression import matplotlib.pyplot as plt from sklearn.model_selection import train_test_split data = pd.read_csv('your_file.csv') # 读取csv文件 x_data = data....

from sklearn.datasets import make_blobs X, y = make_blobs(random_state=42) mglearn.discrete_scatter(X[:, 0], X[:, 1], y) plt.xlabel("Feature 0") plt.ylabel("Feature 1") plt.legend("Class 0","Class 1","Class 2")修改代码

from sklearn.datasets import make_blobs import matplotlib.pyplot as plt import mglearn X, y = make_blobs(random_state=42) mglearn.discrete_scatter(X[:, 0], X[:, 1], y) plt.xlabel("Feature 0") plt....

import numpy as np import matplotlib.pyplot as plt import pandas as pd import seaborn as sns from sklearn.datasets import load_boston from sklearn.model_selection import train_test_split from sklearn.linear_model import LinearRegression from sklearn import metrics from sklearn import preprocessing

然后，你使用线性回归模型（LinearRegression）对数据进行拟合，并使用 metrics 库中的一些函数来评估模型的性能。最后，你使用 preprocessing 库对数据进行标准化处理。这些步骤都是非常常见的机器学习流程中的一...

翻译代码import matplotlib.pyplot as plt import numpy as np from sklearn import datasets, linear_model from sklearn.metrics import mean_squared_error, r2_score # Load the diabetes dataset diabetes_X, diabetes_y = datasets.load_diabetes(return_X_y=True) # Use only one feature diabetes_X = diabetes_X[:, np.newaxis, 2] # Split the data into training/testing sets diabetes_X_train = diabetes_X[:-20] diabetes_X_test = diabetes_X[-20:] # Split the targets into training/testing sets diabetes_y_train = diabetes_y[:-20] diabetes_y_test = diabetes_y[-20:] # Create linear regression object regr = linear_model.LinearRegression() # Train the model using the training sets regr.fit(diabetes_X_train, diabetes_y_train) # Make predictions using the testing set diabetes_y_pred = regr.predict(diabetes_X_test) # The coefficients print("Coefficients: \n", regr.coef_) # The mean squared error print("Mean squared error: %.2f" % mean_squared_error(diabetes_y_test, diabetes_y_pred)) # The coefficient of determination: 1 is perfect prediction print("Coefficient of determination: %.2f" % r2_score(diabetes_y_test, diabetes_y_pred)) # Plot outputs plt.scatter(diabetes_X_test, diabetes_y_test, color="black") plt.plot(diabetes_X_test, diabetes_y_pred, color="blue", linewidth=3) plt.xticks(()) plt.yticks(()) plt.show()

1.导入需要的库，包括 Matplotlib 和 Numpy 用于绘图和数据处理，以及 Scikit-learn 中的 datasets、linear_model 和 metrics 模块。 2.加载糖尿病数据集，即 diabetes_X 和 diabetes_y。 3.仅使用一个特征（即第3...

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from sklearn.datasets import make_blobs X, y = make_blobs(random_state=42) mglearn.discrete_scatter(X[:, 0], X[:, 1], y) plt.xlabel("Feature 0") plt.ylabel("Feature 1") plt.legend("Class 0","Class 1","Class 2")修改代码

import numpy as np import matplotlib.pyplot as plt import pandas as pd import seaborn as sns from sklearn.datasets import load_boston from sklearn.model_selection import train_test_split from sklearn.linear_model import LinearRegression from sklearn import metrics from sklearn import preprocessing

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