rf=ensemble.RandomForestRegressor(n_estimators=30,max_depth=18,min_samples_leaf=10,min_samples_split=20) def Creat_X_y(select_f,feature,label): # select_f1=select_f.query(label+'!=-9999.99') p=select_f[feature+[label]] print(p.info()) t=p.isin([-9999.99]).any(axis=1) p=p[~t] t=p.isin([-9999]).any(axis=1) select_data=p[~t] print(select_data.info()) select_data=select_data.dropna() print(select_data.info()) X=select_data[feature] y=select_data[label] return X,y X,y=Creat_X_y(dr4,feature,label) ''' X=dr3 y=dr1.iloc[:,12] ''' X_train, X_test, y_train, y_test = train_test_split( X, y, test_size=0.25, random_state=42) def RFS(rf,x_train, x_test, y_train, y_test): rf.fit(x_train,y_train) score = rf.score(x_test, y_test) result = rf.predict(x_test) print('预测精度',score) x=y_test-result print('均值：',x.mean()) print('方差：',x.std()) return result,rf

from sklearn.ensemble import RandomForestClassifier rf=RandomForestClassifier(min_samples_leaf=1,max_depth=20,min_samples_split=2,n_estimators=200) rf.fit(x_train,y_train)什么意思

- rf = RandomForestClassifier(min_samples_leaf=1, max_depth=20, min_samples_split=2, n_estimators=200): 创建一个随机森林分类器的实例，并设置参数。这些参数包括： - min_samples_leaf=1: 叶子节点最小...

from sklearn.ensemble import GradientBoostingClassifier gbc = GradientBoostingClassifier(loss='deviance', learning_rate=0.1, n_estimators=5, subsample=1, min_samples_split=2, min_samples_leaf=1, max_depth=3) gbc.fit(X_train, y_train)什么意思

这是一个使用梯度提升树...- min_samples_split 和 min_samples_leaf：控制每个基分类器的分裂条件，避免过拟合。 gbc.fit(X_train, y_train) 则是使用训练集 X_train 和标签 y_train 来训练模型。

bagging = BaggingClassifier(n_estimators=10)

n_estimators参数指定了使用多少个基分类器进行集成，这里设置为10个。可以通过设置其他参数来调整模型的性能和效果，例如： - base_estimator：指定使用的基分类器，默认为决策树分类器。 - max_samples：...

from sklearn.ensemble import RandomForestClassifier rf_model = RandomForestClassifier(random_state=42, min_samples_leaf=25) prams ={ 'n_estimators':[10 ,20,40,50, 70], 'max_depth' : [3 ,5, 7,8, 11, 12],'min_samples_split' : [2, 3, 5, 9] , 'criterion' : ['gini', 'entropy'], 'max_features':['sqrt','log2'] } gd_rf= GridSearchCV(rf_model , param_grid=prams, n_jobs=-1 ,cv=10) gd_rf.fit(X_train , y_train) print(gd_rf.best_estimator_)解释各行代码

3. prams ={ 'n_estimators':[10 ,20,40,50, 70], 'max_depth' : [3 ,5, 7,8, 11, 12],'min_samples_split' : [2, 3, 5, 9] , 'criterion' : ['gini', 'entropy'], 'max_features':['sqrt','log2'] }：设置超参数...

from sklearn.ensemble import ExtraTreesClassifier from sklearn.model_selection import GridSearchCV kfold=StratifiedKFold(n_splits=10) rf=RandomForestClassifier() ext_param_grid={"max_depth":[None], "max_features":[1,3,10], "min_samples_split":[2,3,10], "min_samples_leaf":[1,3,10], "bootstrap":[True,False], "n_estimators":[100,300], "criterion":["gini"]} rf_gs=GridSearchCV(rf,param_grid=rf_param_grid,cv=kfold, scoring="accuracy",n_jobs=10,verbose=1) rf_gs.fit(X_train,y_train)全部代码

rf_param_grid = {"max_depth":[None], "max_features":[1,3,10], "min_samples_split":[2,3,10], "min_samples_leaf":[1,3,10], "bootstrap":[True,False], "n_estimators":[100,300], "criterion":["gini"]}...

tree_reg = DecisionTreeRegressor() # 创建Bagging回归器 Bagging = ensemble.BaggingRegressor(tree_reg, n_estimators=B, max_samples=100, bootstrap=True, n_jobs=-1) Bagging.fit(X_train,Y_train) TrainErrBagging=np.zeros((B,)) TestErrBagging=np.zeros((B,)) for b,Y_pred in enumerate(Bagging.staged_predict(X_train)): TrainErrBagging[b]=1-r2_score(Y_train,Y_pred[:,1]) for b,Y_pred in enumerate(Bagging.staged_predict(X_test)): TestErrBagging[b]=1-r2_score(Y_test,Y_pred[:,1]) 出现以下问题怎样修改 'BaggingRegressor' object has no attribute 'staged_predict'

Bagging = ensemble.BaggingRegressor(tree_reg, n_estimators=B, max_samples=100, bootstrap=True, n_jobs=-1) Bagging.fit(X_train,Y_train) TrainErrBagging = np.zeros((B,)) TestErrBagging = np.zeros((B,))...

优化这段代码：import pandas as pd import numpy as np from sklearn.ensemble import RandomForestClassifier from sklearn.feature_selection import SelectKBest, f_classif from sklearn.model_selection import train_test_split, GridSearchCV from sklearn.metrics import accuracy_score # 读取Excel文件 data = pd.read_excel("output.xlsx") # 提取特征和标签 features = data.iloc[:, 1:].values labels = np.where(data.iloc[:, 0] > 59, 1, 0) # 特征选择 selector = SelectKBest(score_func=f_classif, k=11) selected_features = selector.fit_transform(features, labels) # 划分训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(selected_features, labels, test_size=0.2, random_state=42) # 创建随机森林分类器 rf_classifier = RandomForestClassifier() # 定义要调优的参数范围 param_grid = { 'n_estimators': [50, 100, 200], # 决策树的数量 'max_depth': [None, 5, 10], # 决策树的最大深度 'min_samples_split': [2, 5, 10], # 拆分内部节点所需的最小样本数 'min_samples_leaf': [1, 2, 4] # 叶节点上所需的最小样本数 } # 使用网格搜索进行调优 grid_search = GridSearchCV(rf_classifier, param_grid, cv=5) grid_search.fit(X_train, y_train) # 输出最佳参数组合和对应的准确率 print("最佳参数组合：", grid_search.best_params_) print("最佳准确率：", grid_search.best_score_) # 使用最佳参数组合训练模型 best_rf_classifier = grid_search.best_estimator_ best_rf_classifier.fit(X_train, y_train) # 预测 y_pred = best_rf_classifier.predict(X_test) # 计算准确率 accuracy = accuracy_score(y_test, y_pred) # 打印最高准确率分类结果 print("最高准确率分类结果：", accuracy)

'max_depth': [None, 5, 10], # 决策树的最大深度 'min_samples_split': [2, 5, 10], # 拆分内部节点所需的最小样本数 'min_samples_leaf': [1, 2, 4] # 叶节点上所需的最小样本数 } # 使用网格搜索进行调优 ...

python 使用skearn自带数据集load_wine完成：随机森林模型训练及测试并使用网格索搜确定参数n_estimators、criterion、max_depth、min_samples_leaf的最优组合并输出

好的，下面是使用Python的sklearn库中的load_wine数据集，完成随机森林模型训练及测试，并使用网格搜索确定参数n_estimators、criterion、max_depth、min_samples_leaf的最优组合的代码实现： python from ...

from sklearn.ensemble import RandomForestClassifier rf_model = RandomForestClassifier(random_state=42, min_samples_leaf=25) rf_model.fit(X_train , y_train) print(f'Train : {rf_model.score(X_train, y_train)}') model_eval(rf_model,X_test,y_test)cm = confusion_matrix(y_test, y_pred) plt.figure(figsize = (8,8)) sns.heatmap(cm,cmap= "Blues", linecolor = 'black' , linewidth = 1 , annot = True, fmt='' , xticklabels = ['A','B','C','D'] , yticklabels = ['A','B','C','D']) plt.xlabel("Predicted") plt.ylabel("Actual") plt.show()from sklearn.ensemble import RandomForestClassifier rf_model = RandomForestClassifier(random_state=42, min_samples_leaf=25) prams ={ 'n_estimators':[10 ,20,40,50, 70], 'max_depth' : [3 ,5, 7,8, 11, 12],'min_samples_split' : [2, 3, 5, 9] , 'criterion' : ['gini', 'entropy'], 'max_features':['sqrt','log2'] } gd_rf= GridSearchCV(rf_model , param_grid=prams, n_jobs=-1 ,cv=10) gd_rf.fit(X_train , y_train) print(gd_rf.best_estimator_)print(f'Train : {tuned_rf.score(X_train, y_train)}') model_eval(tuned_rf,X_test,y_test) print()解释每行代码

12. prams ={ 'n_estimators':[10 ,20,40,50, 70], 'max_depth' : [3 ,5, 7,8, 11, 12],'min_samples_split' : [2, 3, 5, 9] , 'criterion' : ['gini', 'entropy'], 'max_features':['sqrt','log2'] }: 定义一个...

请调试这段代码以实现梯度上升模型进行波士顿房价预测，画出预测图，代码如下：import pandas as pd import numpy as np import matplotlib.pyplot as plt from sklearn.model_selection import train_test_split from sklearn.metrics import mean_squared_error plt.style.use('ggplot') # 读入数据 data = pd.read_csv('D:\PycharmProjects\Boston_housing\housing.csv') X, y = data[data.columns.delete(-1)], data['MEDV'] X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=888) from sklearn.preprocessing import StandardScaler ss_x = StandardScaler() X_train = ss_x.fit_transform(X_train) X_test = ss_x.transform(X_test) ss_y = StandardScaler() y_train = ss_y.fit_transform(y_train.values.reshape(-1, 1)) y_test = ss_y.transform(y_test.values.reshape(-1, 1)) from sklearn import ensemble # params = {'n_estimators': 500, 'max_depth': 4, 'min_samples_split': 1,'learning_rate': 0.01, 'loss': 'ls'} # clf = ensemble.GradientBoostingRegressor(**params) clf = ensemble.GradientBoostingRegressor() clf.fit(X_train, y_train) clf_pre_values = clf.predict(X_test) # 预测值 print('SCORE:{:.4f}'.format(clf.score(X_test, y_test))) # 模型评分 print('RMSE:{:.4f}'.format(np.sqrt(mean_squared_error(y_test, clf_pre_values)))) # RMSE(标准误差) clf_pre = pd.DataFrame() clf_pre['Predict'] = clf_pre_values clf_pre['Truth'] = y_test.reset_index(drop=True) clf_pre.plot(figsize=(18, 8)) plt.figure() plt.show()

根据您提供的代码，我注意到您的代码中没有明确指定数据文件的路径。请确保housing.csv文件与您的代码在同一个文件夹中，并将文件的路径正确指定为相对路径或绝对路径。另外，您的代码中没有导入matplotlib....

请根据以下代码，补全并完成任务代码：作业：考虑Breast_Cancer-乳腺癌数据集总类别数为2 特征数为30 样本数为569（正样本212条，负样本357条）特征均为数值连续型、无缺失值 (1)使用GridSearchCV搜索单个DecisionTreeClassifier中max_samples,max_features,max_depth的最优值。 (2)使用GridSearchCV搜索BaggingClassifier中n_estimators的最佳值。 (3)考虑BaggingClassifier中的弱分类器使用SVC（可以考虑是否使用核函数），类似步骤(1),(2)，自己调参（比如高斯核函数的gamma参数,C参数），寻找最优分类结果。from sklearn.datasets import load_breast_cancer from sklearn.preprocessing import StandardScaler from sklearn.model_selection import train_test_split from sklearn.tree import DecisionTreeClassifier from sklearn.ensemble import RandomForestClassifier import numpy as np import matplotlib.pyplot as plt from matplotlib.colors import ListedColormap ds_breast_cancer = load_breast_cancer() X=ds_breast_cancer.data y=ds_breast_cancer.target # draw sactter f1 = plt.figure() cm_bright = ListedColormap(['r', 'b', 'g']) ax = plt.subplot(1, 1, 1) ax.set_title('breast_cancer') ax.scatter(X[:, 0], X[:, 1], c=y, cmap=cm_bright, edgecolors='k') plt.show() #（1） from sklearn.tree import DecisionTreeClassifier from sklearn.model_selection import GridSearchCV from sklearn.preprocessing import StandardScaler # 数据预处理 sc = StandardScaler() X_std = sc.fit_transform(X) # 定义模型，添加参数 min_samples_leaf tree = DecisionTreeClassifier(min_samples_leaf=1) # 定义参数空间 param_grid = {'min_samples_leaf': [1, 2, 3, 4, 5], 'max_features': [0.4, 0.6, 0.8, 1.0], 'max_depth': [3, 5, 7, 9, None]} # 定义网格搜索对象 clf = GridSearchCV(tree, param_grid=param_grid, cv=5) # 训练模型 clf.fit(X_std, y) # 输出最优参数 print("Best parameters:", clf.best_params_) #（2） from sklearn.ensemble import BaggingClassifier # 定义模型 tree = DecisionTreeClassifier() bagging = BaggingClassifier(tree) # 定义参数空间 param_grid = {'n_estimators': [10, 50, 100, 200, 500]} # 定义网格搜索对象 clf = GridSearchCV(bagging, param_grid=param_grid, cv=5) # 训练模型 clf.fit(X_std, y) # 输出最优参数 print("Best parameters:", clf.best_params_)

'n_estimators': [10, 50, 100, 200, 500] } # 定义网格搜索对象 clf = GridSearchCV(bagging, param_grid=param_grid, cv=5) # 训练模型 clf.fit(X_std, y) # 输出最优参数 print("Best parameters:", clf.best...

请根据以下代码，补全并完成任务代码（要求代码准确无误，且能较快运行出结果）：作业：考虑Breast_Cancer-乳腺癌数据集总类别数为2 特征数为30 样本数为569（正样本212条，负样本357条）特征均为数值连续型、无缺失值 (1)使用GridSearchCV搜索单个DecisionTreeClassifier中max_samples,max_features,max_depth的最优值。 (2)使用GridSearchCV搜索BaggingClassifier中n_estimators的最佳值。 (3)考虑BaggingClassifier中的弱分类器使用SVC（可以考虑是否使用核函数），类似步骤(1),(2)，自己调参（比如高斯核函数的gamma参数,C参数），寻找最优分类结果。from sklearn.datasets import load_breast_cancer from sklearn.preprocessing import StandardScaler from sklearn.model_selection import train_test_split from sklearn.tree import DecisionTreeClassifier from sklearn.ensemble import RandomForestClassifier import numpy as np import matplotlib.pyplot as plt from matplotlib.colors import ListedColormap ds_breast_cancer = load_breast_cancer() X=ds_breast_cancer.data y=ds_breast_cancer.target # draw sactter f1 = plt.figure() cm_bright = ListedColormap(['r', 'b', 'g']) ax = plt.subplot(1, 1, 1) ax.set_title('breast_cancer') ax.scatter(X[:, 0], X[:, 1], c=y, cmap=cm_bright, edgecolors='k') plt.show() #（1） from sklearn.tree import DecisionTreeClassifier from sklearn.model_selection import GridSearchCV from sklearn.preprocessing import StandardScaler # 数据预处理 sc = StandardScaler() X_std = sc.fit_transform(X) # 定义模型，添加参数 min_samples_leaf tree = DecisionTreeClassifier(min_samples_leaf=1) # 定义参数空间 param_grid = {'min_samples_leaf': [1, 2, 3, 4, 5], 'max_features': [0.4, 0.6, 0.8, 1.0], 'max_depth': [3, 5, 7, 9, None]} # 定义网格搜索对象 clf = GridSearchCV(tree, param_grid=param_grid, cv=5) # 训练模型 clf.fit(X_std, y) # 输出最优参数 print("Best parameters:", clf.best_params_) #（2） from sklearn.ensemble import BaggingClassifier # 定义模型 tree = DecisionTreeClassifier() bagging = BaggingClassifier(tree) # 定义参数空间 param_grid = {'n_estimators': [10, 50, 100, 200, 500]} # 定义网格搜索对象 clf = GridSearchCV(bagging, param_grid=param_grid, cv=5) # 训练模型 clf.fit(X_std, y) # 输出最优参数 print("Best parameters:", clf.best_params_)

param_grid = {'n_estimators': [10, 50, 100, 200, 500], 'base_estimator__kernel': ['linear', 'poly', 'rbf', 'sigmoid'], 'base_estimator__C': [0.1, 1, 10, 100], 'base_estimator__gamma': ['scale', '...

from sklearn.ensemble import IsolationForest model = IsolationForest(n_estimators=100, max_samples='auto', contamination=float(0.1), max_features=1.0) X = df2[['age','current_height']].values model.fit(X) df2['scores'] = model.decision_function(X) df2['anomaly'] = model.predict(X) outliers = inliers = plt.scatter(inliers[:, 0], inliers[:, 1], c='blue', label='Inliers') plt.scatter(outliers[:, 0], outliers[:, 1], c='red', label='Outliers') plt.xlabel('age') plt.ylabel('current_height') plt.legend() plt.show()

在你的代码中，你已经拟合了孤立森林模型并预测了异常值。现在你需要根据预测结果提取异常值和非异常值的数据，并进行散点图的可视化。你可以使用以下代码来提取异常值和非异常值的数据，并进行散点图的可视化： ...

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