rf = sklearn.ensemble.RandomForestClassifier(n_estimators=500) rf.fit(train_vectors, newsgroups_train.target)

rF.rar_python 随机森林_随机森林_随机森林Python_随机森林算法

clf = RandomForestClassifier(n_estimators=100, random_state=42) # 训练模型 clf.fit(X_train, y_train) # 预测 predictions = clf.predict(X_test) 在这个例子中，n_estimators参数设置了要构建的树的...

RF.rar_RF 特征_随机森林_随机森林排序_随机森林排序

在这个项目中，我们可能使用Python中的sklearn库来实现这一过程，特别是sklearn.ensemble.RandomForestClassifier或sklearn.ensemble.RandomForestRegressor类，它们都提供了计算特征重要性的功能。...

逐行解释下面的代码：from sklearn.datasets import load_breast_cancer from sklearn.model_selection import train_test_split, GridSearchCV, KFold from sklearn.ensemble import RandomForestClassifier data = load_breast_cancer() X_train, X_test, y_train, y_test = train_test_split(data.data, data.target, test_size=0.3, random_state=42) kf = KFold(n_splits=5, shuffle=True, random_state=42) param_grid = {'n_estimators': range(1, 21, 1), 'max_depth': range(5, 16)} rf = RandomForestClassifier(random_state=42) grid_search = GridSearchCV(rf, param_grid=param_grid, cv=kf, n_jobs=-1) grid_search.fit(X_train, y_train) best_rf = RandomForestClassifier(n_estimators=grid_search.best_params_['n_estimators'], max_depth=grid_search.best_params_['max_depth'], random_state=42) best_rf.fit(X_train, y_train) y_pred = best_rf.predict(X_test)

首先，代码从sklearn.datasets库中导入了load_breast_cancer函数和从sklearn.model_selection库中导入了train_test_split、GridSearchCV和KFold函数以及从sklearn.ensemble库中导入了RandomForestClassifier类。...

X=dataset.iloc[:,2:-1] y=dataset.iloc[:,1] print(dataset.shape) from sklearn.model_selection import train_test_split X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2,random_state=0) from sklearn.preprocessing import StandardScaler sc = StandardScaler() X_train =sc.fit_transform(X_train) X_test= sc.transform(X_test) from sklearn.ensemble import RandomForestRegressor rf=RandomForestRegressor(n_estimators=200,random_state=0) #rf.fit(X_train, y_train) #拟合训练集 rf.fit(X_train, y_train) #对训练集和测试集进行预测 y_train_pred=rf.predict(X_train) y_test_pred=rf.predict(X_test) print(y_test_pred)

首先，将数据集分为自变量（X）和因变量（y），然后使用train_test_split函数将数据集分为训练数据集和测试数据集。接着，使用StandardScaler函数对自变量进行标准化处理，使得数据分布更加符合正态分布。最后，使用...

from sklearn.datasets import load_breast_cancer from sklearn.model_selection import train_test_split from sklearn.ensemble import RandomForestClassifier from sklearn.metrics import accuracy_score from lime.lime_tabular import LimeTabularExplainer import numpy as np import pandas as pd # 准备数据 data = load_breast_cancer() # df=pd.DataFrame(data.data,columns=data.feature_names) # df['target']=data.target # print(df.head()) X = data.data y = data.target # 划分训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.3, random_state=42) # 训练模型 rfc = RandomForestClassifier(n_estimators=100, random_state=42) rfc.fit(X_train, y_train) # 预测结果 y_pred = rfc.predict(X_test) accuracy = accuracy_score(y_test, y_pred) print(f"Accuracy:{accuracy:.3f}") # 解释模型结果 def explain_sample(x, model, feature_names): explainer = LimeTabularExplainer(X_train, feature_names=feature_names, class_names=data.target_names) exp = explainer.explain_instance(x, model.predict_proba, num_features=len(feature_names)) return exp # 随机选择一个测试样本并解释 idx = np.random.randint(len(X_test)) x=X_test[idx] exp=explain_sample(x,rfc,data.feature_names) fig=exp.as_pyplot_figure() print(f"Sample index:{idx}") fig.show()优化一下这段代码，让可视化图片不要一闪而过

rfc = RandomForestClassifier(n_estimators=100, random_state=42) rfc.fit(X_train, y_train) # 预测结果 y_pred = rfc.predict(X_test) accuracy = accuracy_score(y_test, y_pred) print(f"Accuracy:{...

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...

解释以下代码意义：from sklearn.ensemble import RandomForestClassifier rf_clf = RandomForestClassifier(random_state=0) rf_clf.fit(train_feats,train_target.ravel())#train变为一维数组

首先，从sklearn.ensemble模块中导入了RandomForestClassifier类。接着，创建了一个名为rf_clf的随机森林分类器对象，并将其初始化，其中random_state参数用于指定随机数生成器的种子，以便在每次运行时得到相同的...

解释from sklearn.ensemble import RandomForestClassifier # Create the model with 200 trees RF_model = RandomForestClassifier(n_estimators=200, bootstrap = True, max_features = 'sqrt') # Fit on training data RF_model.fit(X_train_split,y_train_split) # Actual class predictions tr_predictions = RF_model.predict(X_train_split) rf_predictions = RF_model.predict(X_val) # Probabilities for each class print('平均分类准确率为：\n',accuracy_score(y_train_split,np.round(tr_predictions))) print('平均分类准确率为：\n',accuracy_score(y_val,np.round(rf_predictions)))

首先，通过从sklearn.ensemble中导入RandomForestClassifier类，创建一个包含200个决策树的随机森林模型。其中，bootstrap=True表示使用自助法（bootstrap）采样训练数据，max_features='sqrt'表示在每个决策树节点...

运行下面代码需要安装哪些包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

运行上述代码需要安装以下Python包： - scikit-learn：提供了机器学习算法和工具，包括模型选择、特征提取、预处理等。可以使用pip install scikit-learn进行安装。 - pandas：提供了高性能、易于使用的数据结构...

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.ensemble import RandomForestClassifier from sklearn.metrics import roc_auc_score import datetime import multiprocessing as mp from sklearn.ensemble import StackingClassifier from sklearn....

from sklearn.ensemble import RandomForestClassifier from sklearn.datasets import load_wine from sklearn.model_selection import train_test_split wine = load_wine() # 加载数据 data = wine.data # 属性列 target = wine.target # 标签列 # 划分训练集、测试集 traindata, testdata, traintarget, testtarget = \ train_test_split(data, target, test_size=0.2, random_state=1234) model_rf = RandomForestClassifier() # 确定随机森林参数 model_rf.fit(traindata, traintarget) # 拟合数据 print("建立的随机森林模型为：\n", model_rf)解读这段代码

这段代码使用了 scikit-learn 中的随机森林分类器 (RandomForestClassifier) 来对葡萄酒数据集进行分类。主要步骤如下： 1.导入必要的库和数据集：从 scikit-learn 中导入随机森林分类器、葡萄酒数据集以及训练集和...

import matplotlib.pyplot as plt import pandas as pd df = pd.read_excel(r"db聚类专用版.xlsx") df.head() from sklearn.model_selection import train_test_split #数据划分 X = df[["Bridge length (m)","Structural type","Pier type","Foundation type", "Bearing type","Plane linear"]] y = df[['Vulnerability grade']] xtrain, xtest, ytrain, ytest =\ train_test_split(X, y, test_size=0.2, random_state=100) from sklearn.ensemble import RandomForestClassifier rf = RandomForestClassifier( n_estimators=100, random_state=8 ) rf.fit(xtrain, ytrain) #预测训练集结果 train_predicted = rf.predict(xtrain)

其中，n_estimators=100 表示决策树数量为 100，random_state=8 表示设置随机种子以确保可重复性。接下来，使用训练集的数据 xtrain 和目标变量 ytrain 调用 fit() 方法来训练随机森林分类器模型。 ...

index0 = numerical_corr.sort_values(ascending=False).index 36 print(train_data_scaler[index0].corr('spearman')) 37 38 new_numerical=['V0', 'V2', 'V3', 'V4', 'V5', 'V6', 'V10','V11', 39 'V13', 'V15', 'V16', 'V18', 'V19', 'V20', 'V22','V24','V30', 'V31', 'V37'] 40 X=np.matrix(train_data_scaler[new_numerical]) 41 VIF_list=[variance_inflation_factor(X, i) for i in range(X.shape[1])] 42 VIF_list 43 44 45 pca = PCA(n_components=0.9) 46 new_train_pca_90 = pca.fit_transform(train_data_scaler.iloc[:,0:-1]) 47 new_test_pca_90 = pca.transform(test_data_scaler) 48 new_train_pca_90 = pd.DataFrame(new_train_pca_90) 49 new_test_pca_90 = pd.DataFrame(new_test_pca_90) 50 new_train_pca_90['target'] = train_data_scaler['target'] 51 new_train_pca_90.describe() 52 53 pca = PCA(n_components=0.95) 54 new_train_pca_16 = pca.fit_transform(train_data_scaler.iloc[:,0:-1]) 55 new_test_pca_16 = pca.transform(test_data_scaler) 56 new_train_pca_16 = pd.DataFrame(new_train_pca_16) 57 new_test_pca_16 = pd.DataFrame(new_test_pca_16) 58 new_train_pca_16['target'] = train_data_scaler['target'] 59 new_train_pca_16.describe() 60 61 from sklearn.ensemble import GradientBoostingRegressor 62 63 from sklearn.model_selection import learning_curve 64 from sklearn.model_selection import ShuffleSplit 65 66 new_train_pca_16 = new_train_pca_16.fillna(0) 67 train = new_train_pca_16[new_test_pca_16.columns] 68 target = new_train_pca_16['target'] 69 70 train_data,test_data,train_target,test_target=train_test_split(train,target,test_size=0.2,random_state=0) 71 72 clf = LinearRegression() 73 clf.fit(train_data, train_target) 74 score = mean_squared_error(test_target, clf.predict(test_data)) 75 print("LinearRegression: ", score) 76 77 train_score = [] 78 test_score = []解释每一句代码的意思

这段代码是一段Python程序，主要是进行数据预处理和建模的操作。下面是每一句代码的意思： - 第36行：对数据进行排序，返回排序后的索引。 - 第38行：指定一些列作为新的数值特征。 - 第40行：将选定列的数据转化为...

# 导入必要的库 from sklearn.ensemble import RandomForestClassifier from sklearn.model_selection import train_test_split from sklearn.metrics import accuracy_score # 加载数据集并准备自变量和因变量 df= X = dataset[['x1', 'x2']] # 选择两个自变量 x1 和 x2 y = dataset['y'] # 因变量为 y # 将数据集划分为训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2) # 创建随机森林模型并在训练集上拟合模型 rf = RandomForestClassifier(n_estimators=100, max_depth=5) rf.fit(X_train, y_train) # 使用测试集来评估模型的性能 y_pred = rf.predict(X_test) accuracy = accuracy_score(y_test, y_pred) print('Accuracy:', accuracy)（代码改进）

rf = RandomForestClassifier(n_estimators=100, max_depth=5) rf.fit(X_train, y_train) # 使用测试集来评估模型的性能 y_pred = rf.predict(X_test) accuracy = accuracy_score(y_test, y_pred) print('Accuracy:...

# 导入必要的库 import pandas as pd from sklearn.ensemble import RandomForestClassifier from sklearn.model_selection import train_test_split from sklearn.metrics import accuracy_score # 加载数据集并准备自变量和因变量 df= pd.read_csv(r"D:\数学建模\重航数学建模校赛\最终类别.csv", encoding='gbk') X = df["组别"] y = df['网民数目'] # 因变量为 y # 将数据集划分为训练集和测试集 X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2) # 创建随机森林模型并在训练集上拟合模型 rf = RandomForestClassifier(n_estimators=100, max_depth=5) rf.fit(X_train, y_train) # 使用测试集来评估模型的性能 y_pred = rf.predict(X_test) accuracy = accuracy_score(y_test, y_pred) print('Accuracy:', accuracy)（代码改进）

rf = RandomForestClassifier(n_estimators=100, max_depth=5) rf.fit(X_train, y_train) # 使用测试集来评估模型的性能 y_pred = rf.predict(X_test) accuracy = accuracy_score(y_test, y_pred) print('Accuracy:...

import pandas as pd import matplotlib.pyplot as plt import seaborn as sns from sklearn.model_selection import train_test_split from sklearn.preprocessing import StandardScaler from sklearn.ensemble import RandomForestClassifier from sklearn.metrics import confusion_matrix, classification_report, accuracy_score # 1. 数据准备 train_data = pd.read_csv('train.csv') test_data = pd.read_csv('test_noLabel.csv') # 填充缺失值 train_data.fillna(train_data.mean(), inplace=True) test_data.fillna(test_data.mean(), inplace=True) # 2. 特征工程 X_train = train_data.drop(['Label', 'ID'], axis=1) y_train = train_data['Label'] X_test = test_data.drop('ID', axis=1) scaler = StandardScaler() X_train = scaler.fit_transform(X_train) X_test = scaler.transform(X_test) # 3. 模型建立 model = RandomForestClassifier(n_estimators=100, random_state=42) # 4. 模型训练 model.fit(X_train, y_train) # 5. 进行预测 y_pred = model.predict(X_test) # 6. 保存预测结果 df_result = pd.DataFrame({'ID': test_data['ID'], 'Label': y_pred}) df_result.to_csv('forecast_result.csv', index=False) # 7. 模型评估 y_train_pred = model.predict(X_train) print('训练集准确率：', accuracy_score(y_train, y_train_pred)) print('测试集准确率：', accuracy_score(y_test, y_pred)) print(classification_report(y_test, y_pred)) # 8. 绘制柱形图 feature_importances = pd.Series(model.feature_importances_, index=X_train.columns) feature_importances = feature_importances.sort_values(ascending=False) plt.figure(figsize=(10, 6)) sns.barplot(x=feature_importances, y=feature_importances.index) plt.xlabel('Feature Importance Score') plt.ylabel('Features') plt.title('Visualizing Important Features') plt.show() # 9. 对比类分析 train_data['Label'].value_counts().plot(kind='bar', color=['blue', 'red']) plt.title('Class Distribution') plt.xlabel('Class') plt.ylabel('Frequency') plt.show()

feature_importances = pd.Series(model.feature_importances_, index=X_train.columns) feature_importances = feature_importances.sort_values(ascending=False) plt.figure(figsize=(10, 6)) sns.barplot(x=...

from sklearn.feature_selection import SelectFromModel from sklearn.ensemble import RandomForestClassifier as RFC RFC_=RFC(n_estimators=10,random_state=0) X_embedded=SelectFromModel(RFC_,threshold=0.005).fit_transform(x,y)

首先，通过 RFC(n_estimators=10, random_state=0) 创建了一个随机森林分类器对象 RFC_，其中 n_estimators 参数指定了随机森林中决策树的数量，random_state 参数用于控制随机性。然后，使用 SelectFrom...

from sklearn.ensemble import GradientBoostingClassifier from sklearn.datasets import load_iris from sklearn.model_selection import train_test_split, GridSearchCV from sklearn.metrics import accuracy_score from sklearn.tree import export_graphviz import graphviz from IPython.display import display # 加载iris数据集 iris = load_iris() X = iris.data y = iris.target什么意思

'n_estimators': [50, 100, 200], 'learning_rate': [0.1, 0.05, 0.01], 'max_depth': [3, 5, 7] } grid_search = GridSearchCV(estimator=gbdt, param_grid=param_grid, cv=5) grid_search.fit(X_train, y_train...

import seaborn as sns corrmat = df.corr() top_corr_features = corrmat.index plt.figure(figsize=(16,16)) #plot heat map g=sns.heatmap(df[top_corr_features].corr(),annot=True,cmap="RdYlGn") plt.show() sns.set_style('whitegrid') sns.countplot(x='target',data=df,palette='RdBu_r') plt.show() dataset = pd.get_dummies(df, columns = ['sex', 'cp', 'fbs','restecg', 'exang', 'slope', 'ca', 'thal']) from sklearn.model_selection import train_test_split from sklearn.preprocessing import StandardScaler standardScaler = StandardScaler() columns_to_scale = ['age', 'trestbps', 'chol', 'thalach', 'oldpeak'] dataset[columns_to_scale] = standardScaler.fit_transform(dataset[columns_to_scale]) dataset.head() y = dataset['target'] X = dataset.drop(['target'], axis=1) from sklearn.model_selection import cross_val_score knn_scores = [] for k in range(1, 21): knn_classifier = KNeighborsClassifier(n_neighbors=k) score = cross_val_score(knn_classifier, X, y, cv=10) knn_scores.append(score.mean()) plt.plot([k for k in range(1, 21)], knn_scores, color='red') for i in range(1, 21): plt.text(i, knn_scores[i - 1], (i, knn_scores[i - 1])) plt.xticks([i for i in range(1, 21)]) plt.xlabel('Number of Neighbors (K)') plt.ylabel('Scores') plt.title('K Neighbors Classifier scores for different K values') plt.show() knn_classifier = KNeighborsClassifier(n_neighbors = 12) score=cross_val_score(knn_classifier,X,y,cv=10) score.mean() from sklearn.ensemble import RandomForestClassifier randomforest_classifier= RandomForestClassifier(n_estimators=10) score=cross_val_score(randomforest_classifier,X,y,cv=10) score.mean()的roc曲线的代码

randomforest_classifier = RandomForestClassifier(n_estimators=10) rf_tprs = [] rf_aucs = [] for i, (train, test) in enumerate(cv.split(X, y)): randomforest_classifier.fit(X.iloc[train], y.iloc[train]...

rf = sklearn.ensemble.RandomForestClassifier(n_estimators=500) rf.fit(train_vectors, newsgroups_train.target)

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解释以下代码意义 ：from sklearn.ensemble import RandomForestClassifier rf_clf = RandomForestClassifier(random_state=0) rf_clf.fit(train_feats,train_target.ravel())#train变为一维数组

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解释以下代码意义：from sklearn.ensemble import RandomForestClassifier rf_clf = RandomForestClassifier(random_state=0) rf_clf.fit(train_feats,train_target.ravel())#train变为一维数组