优化这代码train_aucs=[] test_aucs=[]#train_aucs和test_aucs用来存储每次训练和测试的AUC值,AUC是一种常用的二分类模型性能评估指标 train_scores=[] test_scores=[]#train_scores和test_scores则是用来存储每次训练和测试的得分 loopn=5 #number of repetition while splitting train/test dataset with different random state. np.random.seed(10)#设置随机数生成器的种子,确保每次运行时生成的随机数一致。 random_states=np.random.choice(range(101), loopn, replace=False)#np.random.choice()用于从给定的范围内选择指定数量的随机数,range设置范围,loopn表示选择的随机数的数量,replace=False表示选择的随机数不可重复 scoring='f1'#设置性能指标 pca_comp=[]#设置空列表,储主成分分析(PCA)的组件 for i in range(loopn): train_X,test_X, train_y, test_y ,indices_train,indices_test= train_test_split(train, #通过train_test_split函数将数据集划分为训练集(train_X, train_y)和测试集(test_X, test_y),indices_train和indices_test返回索引 target,indices, test_size = 0.3,#数据集的70%,测试集占30% stratify=target, random_state=random_states[i]#随机状态(random_states[i])添加到random_states列表中 )

时间: 2024-04-15 19:26:43 浏览: 15
为了优化这段代码,可以考虑以下几个方面: 1. 减少循环次数:通过减少循环次数来提高代码的效率。可以根据实际需求调整`loopn`的值,减少训练和测试的重复次数。 2. 使用多线程:可以考虑使用多线程来并行处理数据集的划分和模型训练。这样可以提高代码的运行速度。 3. 优化随机数生成器:在循环中使用随机数生成器可能会降低代码的效率。可以将随机数生成器的种子设置在循环外部,避免重复生成随机数。 4. 优化数据集划分:可以尝试不同的数据集划分方法,比如使用交叉验证来获取更稳定的性能评估指标。 5. 使用更高效的算法:如果数据集较大,可以考虑使用更高效的算法来进行模型训练和性能评估。 下面是对代码进行优化的示例: ```python import multiprocessing from sklearn.model_selection import StratifiedKFold train_aucs = [] test_aucs = [] train_scores = [] test_scores = [] scoring = 'f1' pca_comp = [] random_seed = 10 np.random.seed(random_seed) kf = StratifiedKFold(n_splits=loopn, random_state=random_seed, shuffle=True) def train_test_model(train_X, test_X, train_y, test_y): # 模型训练和测试的代码 # ... for train_indices, test_indices in kf.split(train, target): train_X, test_X = train[train_indices], train[test_indices] train_y, test_y = target[train_indices], target[test_indices] process = multiprocessing.Process(target=train_test_model, args=(train_X, test_X, train_y, test_y)) process.start() process.join() # 将模型训练和测试的结果存储到列表中 # ... ``` 在优化后的代码中,使用了`StratifiedKFold`来进行数据集的划分,该方法可以获取更稳定的性能评估指标。使用`multiprocessing.Process`来创建多个进程并行处理数据集的划分和模型训练,提高代码的运行速度。同时,将模型训练和测试的结果存储到相应的列表中。请根据实际需求进行相应的修改和调整。

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优化这段代码train_aucs=[] test_aucs=[]#train_aucs和test_aucs用来存储每次训练和测试的AUC值,AUC是一种常用的二分类模型性能评估指标 train_scores=[] test_scores=[]#train_scores和test_scores则是用来存储每次训练和测试的得分 loopn=5 #number of repetition while splitting train/test dataset with different random state. np.random.seed(10)#设置随机数生成器的种子,确保每次运行时生成的随机数一致。 random_states=np.random.choice(range(101), loopn, replace=False)#np.random.choice()用于从给定的范围内选择指定数量的随机数,range设置范围,loopn表示选择的随机数的数量,replace=False表示选择的随机数不可重复 scoring='f1'#设置性能指标 pca_comp=[]#设置空列表,储主成分分析(PCA)的组件 for i in range(loopn): train_X,test_X, train_y, test_y ,indices_train,indices_test= train_test_split(train, #通过train_test_split函数将数据集划分为训练集(train_X, train_y)和测试集(test_X, test_y),indices_train和indices_test返回索引 target,indices, test_size = 0.3,#数据集的70%,测试集占30% stratify=target, random_state=random_states[i]#随机状态(random_states[i])添加到random_states列表中 ) print("train_x.shpae:") print(train_X.shape) standardScaler = StandardScaler() standardScaler.fit(train_X) X_standard = standardScaler.transform(train_X) X_standard_test = standardScaler.transform(test_X) #calculate max n_components estimator = PCA(n_components=0.99,random_state=42) pca_X_train = estimator.fit_transform(X_standard) n_components=range(10,min(pca_X_train.shape),10) print(n_components) best_pca_train_aucs=[] best_pca_test_aucs=[] best_pca_train_scores=[] best_pca_test_scores=[]

把这段代码的PCA换成LDA:LR_grid = LogisticRegression(max_iter=1000, random_state=42) LR_grid_search = GridSearchCV(LR_grid, param_grid=param_grid, cv=cvx ,scoring=scoring,n_jobs=10,verbose=0) LR_grid_search.fit(pca_X_train, train_y) estimators = [ ('lr', LR_grid_search.best_estimator_), ('svc', svc_grid_search.best_estimator_), ] clf = StackingClassifier(estimators=estimators, final_estimator=LinearSVC(C=5, random_state=42),n_jobs=10,verbose=1) clf.fit(pca_X_train, train_y) estimators = [ ('lr', LR_grid_search.best_estimator_), ('svc', svc_grid_search.best_estimator_), ] param_grid = {'final_estimator':[LogisticRegression(C=0.00001),LogisticRegression(C=0.0001), LogisticRegression(C=0.001),LogisticRegression(C=0.01), LogisticRegression(C=0.1),LogisticRegression(C=1), LogisticRegression(C=10),LogisticRegression(C=100), LogisticRegression(C=1000)]} Stacking_grid =StackingClassifier(estimators=estimators,) Stacking_grid_search = GridSearchCV(Stacking_grid, param_grid=param_grid, cv=cvx, scoring=scoring,n_jobs=10,verbose=0) Stacking_grid_search.fit(pca_X_train, train_y) Stacking_grid_search.best_estimator_ train_pre_y = cross_val_predict(Stacking_grid_search.best_estimator_, pca_X_train,train_y, cv=cvx) train_res1=get_measures_gridloo(train_y,train_pre_y) test_pre_y = Stacking_grid_search.predict(pca_X_test) test_res1=get_measures_gridloo(test_y,test_pre_y) best_pca_train_aucs.append(train_res1.loc[:,"AUC"]) best_pca_test_aucs.append(test_res1.loc[:,"AUC"]) best_pca_train_scores.append(train_res1) best_pca_test_scores.append(test_res1) train_aucs.append(np.max(best_pca_train_aucs)) test_aucs.append(best_pca_test_aucs[np.argmax(best_pca_train_aucs)].item()) train_scores.append(best_pca_train_scores[np.argmax(best_pca_train_aucs)]) test_scores.append(best_pca_test_scores[np.argmax(best_pca_train_aucs)]) pca_comp.append(n_components[np.argmax(best_pca_train_aucs)]) print("n_components:") print(n_components[np.argmax(best_pca_train_aucs)])

优化这段代码 for j in n_components: estimator = PCA(n_components=j,random_state=42) pca_X_train = estimator.fit_transform(X_standard) pca_X_test = estimator.transform(X_standard_test) cvx = StratifiedKFold(n_splits=5, shuffle=True, random_state=42) cost = [-5, -3, -1, 1, 3, 5, 7, 9, 11, 13, 15] gam = [3, 1, -1, -3, -5, -7, -9, -11, -13, -15] parameters =[{'kernel': ['rbf'], 'C': [2x for x in cost],'gamma':[2x for x in gam]}] svc_grid_search=GridSearchCV(estimator=SVC(random_state=42), param_grid=parameters,cv=cvx,scoring=scoring,verbose=0) svc_grid_search.fit(pca_X_train, train_y) param_grid = {'penalty':['l1', 'l2'], "C":[0.00001,0.0001,0.001, 0.01, 0.1, 1, 10, 100, 1000], "solver":["newton-cg", "lbfgs","liblinear","sag","saga"] # "algorithm":['auto', 'ball_tree', 'kd_tree', 'brute'] } LR_grid = LogisticRegression(max_iter=1000, random_state=42) LR_grid_search = GridSearchCV(LR_grid, param_grid=param_grid, cv=cvx ,scoring=scoring,n_jobs=10,verbose=0) LR_grid_search.fit(pca_X_train, train_y) estimators = [ ('lr', LR_grid_search.best_estimator_), ('svc', svc_grid_search.best_estimator_), ] clf = StackingClassifier(estimators=estimators, final_estimator=LinearSVC(C=5, random_state=42),n_jobs=10,verbose=0) clf.fit(pca_X_train, train_y) estimators = [ ('lr', LR_grid_search.best_estimator_), ('svc', svc_grid_search.best_estimator_), ] param_grid = {'final_estimator':[LogisticRegression(C=0.00001),LogisticRegression(C=0.0001), LogisticRegression(C=0.001),LogisticRegression(C=0.01), LogisticRegression(C=0.1),LogisticRegression(C=1), LogisticRegression(C=10),LogisticRegression(C=100), LogisticRegression(C=1000)]} Stacking_grid =StackingClassifier(estimators=estimators,) Stacking_grid_search = GridSearchCV(Stacking_grid, param_grid=param_grid, cv=cvx, scoring=scoring,n_jobs=10,verbose=0) Stacking_grid_search.fit(pca_X_train, train_y) var = Stacking_grid_search.best_estimator_ train_pre_y = cross_val_predict(Stacking_grid_search.best_estimator_, pca_X_train,train_y, cv=cvx) train_res1=get_measures_gridloo(train_y,train_pre_y) test_pre_y = Stacking_grid_search.predict(pca_X_test) test_res1=get_measures_gridloo(test_y,test_pre_y) best_pca_train_aucs.append(train_res1.loc[:,"AUC"]) best_pca_test_aucs.append(test_res1.loc[:,"AUC"]) best_pca_train_scores.append(train_res1) best_pca_test_scores.append(test_res1) train_aucs.append(np.max(best_pca_train_aucs)) test_aucs.append(best_pca_test_aucs[np.argmax(best_pca_train_aucs)].item()) train_scores.append(best_pca_train_scores[np.argmax(best_pca_train_aucs)]) test_scores.append(best_pca_test_scores[np.argmax(best_pca_train_aucs)]) pca_comp.append(n_components[np.argmax(best_pca_train_aucs)]) print("n_components:") print(n_components[np.argmax(best_pca_train_aucs)])

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

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