def svmModel(x_train,x_test,y_train,y_test,type): if type=='rbf': svmmodel=svm.SVC(C=15,kernel='rbf',gamma=10,decision_function_shape='ovr') else: svmmodel=svm.SVC(C=0.1,kernel='linear',decision_function_shape='ovr') svmmodel.fit(x_train,y_train.ravel()) print('SVM模型:',svmmodel) train_accscore=svmmodel.score(x_train,y_train) test_accscore=svmmodel.score(x_test,y_test) n_support_numbers=svmmodel.n_support_ return svmmodel,train_accscore,test_accscore,n_support_numbers if __name__=='__main__': iris_feature='花萼长度','花萼宽度','花瓣长度','花瓣宽度' path="D:\data\iris(1).data" data=pd.read_csv(path,header=None) x,y=data[[0,1]],pd.Categorical(data[4]).codes x_train,x_test,y_train,y_test=train_test_split(x,y,random_state=3,train_size=0.6) type='linear' svmmodel,train_accscore,test_accscore,n_support_numbers=svmModel(x_train,x_test,y_train,y_test,type) print('训练集准确率：',train_accscore) print('测试机准确率：',test_accscore) print('支持向量的数目：',n_support_numbers) print('-' * 50) if __name__=='__main__': path='D:/data/iris1-100.data' data=pd.read_csv(path,header=None) x=data[list(range(2,4))] y=data[4].replace(['Iris-versicolor','Iris-virginica'],[0,1]) svmmodel_param=(('linear',0.1),('rbf',1,0.1),('rbf',5,5),('rbf',10,10)) for i, param in enumerate(svmmodel_param): svmmodel,title,accuracyscore=svmModel(x,y,param[0]) y_predict=svmmodel.predict(x) print(title) print('准确率：',accuracyscore) print('支持向量的数目：',svmmodel.n_support_) plt.scatter(x[2],x[3],c=y,edgecolors='k',s=40,cmap=cm_dark) plt.scatter(x.loc[svmmodel.support_,2],x.loc[svmmodel.support_,3],degecolor='k',facecolors='none',s=100,marker='o') z=svmmodel.decision_function(grid_test) z=z.reshape(x1.shape) plt.contour(x1,x2,z,colors=list('kbrbk'),linestyles=['--','--','-','--','--'],linewidths=[1,0.5,11.5,0.5,1],levels=[-1,-0.5,0,0.5,1])检查错误

import numpy as np import pandas as pd from sklearn.model_selection import train_test_split from sklearn.svm import SVC from sklearn.metrics import accuracy_score, confusion_matrix import matplotlib.pyplot as plt import xlrd # 加载数据集并进行预处理 def load_data(filename): data = pd.read_excel(filename) data.dropna(inplace=True) X = data.drop('label', axis=1) X = (X - X.mean()) / X.std() y = data['label'] return X, y # 训练SVM分类器 def train_svm(X_train, y_train, kernel='rbf', C=1, gamma=0.1): clf = SVC(kernel=kernel, C=C, gamma=gamma) clf.fit(X_train, y_train) return clf # 预测新的excel文件并输出预测结果excel、精度和混淆矩阵图 def predict_svm(clf, X_test, y_test, filename, result_file): y_pred = clf.predict(X_test) accuracy = accuracy_score(y_test, y_pred) cm = confusion_matrix(y_test, y_pred) # 输出预测结果excel data = pd.read_excel(filename) data['predicted_label'] = pd.Series(y_pred, index=data.index) data.to_excel(result_file, index=False) # 绘制混淆矩阵图 plt.imshow(cm, cmap=plt.cm.Blues) plt.title('Confusion matrix') plt.colorbar() tick_marks = np.arange(len(set(y_test))) plt.xticks(tick_marks, sorted(set(y_test)), rotation=45) plt.yticks(tick_marks, sorted(set(y_test))) plt.xlabel('Predicted Label') plt.ylabel('True Label') plt.show() return accuracy # 加载数据集并划分训练集和验证集 data = pd.read_excel('data.xlsx') data.dropna(inplace=True) X = data.drop('label', axis=1) X = (X - X.mean()) / X.std() y = data['label'] X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42) # 训练SVM分类器 clf = train_svm(X_train, y_train) # 预测新的excel文件 accuracy = predict_svm(clf, X_test, y_test, 'test_data.xlsx', 'predicted_result.xlsx') # 输出精度 print('Accuracy:', accuracy)修改代码，多个特征变量，一个目标变量进行预测

可以直接使用原来的代码，只需要将数据集中的特征变量的列名修改即可。假设现在有两个特征变量，列名分别为'feature1'和'feature2'，目标变量列名为'label'，则修改load_data... return X, y 其余代码不需要修改。

from sklearn.metrics import auc,roc_curve def evaluation_class(model, x_test, y_test): prediction = model.predict_proba(x_test) preds = model.predict_proba(x_test)[:, 1] fpr,tpr,threshold = roc_curve(y_test,preds) roc_auc = auc(fpr,tpr) plt.title('ROC Curve') plt.plot(fpr,tpr,'g',label = 'AUC = %0.3f' % roc_auc) plt.legend(loc = 'lower right') plt.plot([0,1],[0,1],'r--') plt.xlim([0,1]) plt.ylim([0,1]) plt.ylabel('True Positive Rate') plt.xlabel('False Positive Rate') plt.show() print('ROC AUC score:', round(roc_auc, 4)) from sklearn.ensemble import RandomForestClassifier from sklearn.linear_model import LogisticRegression from sklearn.preprocessing import StandardScaler from sklearn import svm x_train = StandardScaler().fit_transform(x_train) x_test = StandardScaler().fit_transform(x_test) lr = LogisticRegression() lr.fit(x_train,y_train) evaluation_class(lr,x_test,y_test) rf=RandomForestClassifier(max_depth=2,random_state=0) rf.fit(x_train,y_train) evaluation_class(rf,x_test,y_test) sm = svm.SVC(gamma='scale',C=1.0,decision_function_shape='ovr',kernel='rbf',probability=True) sm.fit(x_train,y_train) evaluation_class(sm,x_test,y_test)

接下来，代码使用sklearn库中的LogisticRegression、RandomForestClassifier和svm.SVC函数，分别训练三种不同的分类算法，并使用evaluation_class函数对每个模型进行评估。在evaluation_class函数中，代码使用模型...

# 实现高斯核函数 def rbf_kernel(x1, x2): sigma=1.0 return np.exp(-np.linalg.norm(x1-x2,2)**2/sigma) # 加载葡萄酒识别数据集 wine = datasets.load_wine() # 处理数据和标签 X= wine["data"][:,(0,1)] y = 2 * (wine["target"]==1).astype(np.int64).reshape(-1,1) - 1 # 按照一定比例划分训练集和测试集（测试集占0.4） X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.4, random_state=5) # 定义KernelSVM模型 # 训练模型 # 用Pyplot作图工具绘制模型预测边界 x0s = np.linspace(10, 15, 100) x1s = np.linspace(0, 7, 100) x0, x1 = np.meshgrid(x0s, x1s) W = np.c_[x0.ravel(), x1.ravel()] u= model.predict(W).reshape(x0.shape) plt.plot(X_train[:, 0][y_train[:,0]==1] , X_train[:, 1][y_train[:,0]==1], "gs") plt.plot(X_train[:, 0][y_train[:,0]==-1], X_train[:, 1][y_train[:,0]==-1], "ro") plt.contourf(x0, x1, u, alpha=0.2) plt.show() #计算指标 from sklearn.metrics import accuracy_score from sklearn.metrics import recall_score from sklearn.metrics import precision_score from sklearn.metrics import f1_score accuracy = accuracy_score(y_test, y_pred) precision = precision_score(y_test, y_pred) recall = recall_score(y_test, y_pred) f1 = f1_score(y_test, y_pred) print("accuracy = {}".format(accuracy)) print("precision = {}".format(precision)) print("recall = {}".format(recall)) print("f1 = {}".format(f1))补全代码

X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.4, random_state=5) # 定义KernelSVM模型 svm_clf = Pipeline([ ("scaler", StandardScaler()), ("svm_clf", SVC(kernel="rbf", gamma...

如何在下面这段函数中给nv值限制在nu <= 0 or nu > 1的取值范围内：# 定义适应度评价函数，使用交叉验证计算准确率 def evaluate(individual): clf.set_params(kernel='rbf', gamma=individual[0], nu=individual[1]) accuracy = 0 for i in range(5): X_train, X_test = train_test_split(X_TRAIN, test_size=0.2) clf.fit(X_train) accuracy += clf.score(X_test) return accuracy / 5,

可以使用if语句进行判断，若nu的取值不在规定范围内，则将nv的值赋为0或1。修改后的代码如下： python def f(nu): if nu <= 0: nv = 0 elif nu > 1: nv = 1 else: nv = nu**2 return nv

如何把下面这段函数改成交叉验证：def obj3(x): nu = x[0] gamma = x[1] clf = svm.OneClassSVM(kernel='rbf', gamma=gamma, nu=nu) clf.fit(X_train) pre = clf.predict(X1) pre = np.asarray(pre)+2 v = 1 if nu > 0.5 else -1 y_test = [v] * len(X1) y_test = np.asarray(y_test)+2 acc = accuracy_score(y_test, pre) return acc

acc = cross_val_score(clf, X=X_train, y=np.ones(len(X_train)), cv=5, scoring=acc_scorer) return np.mean(acc) 在这个示例中，使用了交叉验证函数 cross_val_score，其中 cv=5 表示使用 5 折交叉...

如何在下面的代码中给nv值限制在nu <= 0 or nu > 1：from sklearn.svm import OneClassSVM from sklearn.model_selection import train_test_split import numpy as np from deap import creator, base, tools, algorithms # 创建OneClassSVM分类器 clf = OneClassSVM() # 定义优化目标，这里使用评估分类器的准确率 creator.create("FitnessMax", base.Fitness, weights=(1.0,)) creator.create("Individual", list, fitness=creator.FitnessMax) # 定义一些算法参数 POPULATION_SIZE = 10 P_CROSSOVER = 0.9 P_MUTATION = 0.1 MAX_GENERATIONS = 50 HALL_OF_FAME_SIZE = 3 N_PARAMETER = 4 MIN_PARAM = 0.01 MAX_PARAM = 10.0 # 定义适应度评价函数，使用交叉验证计算准确率 def evaluate(individual): clf.set_params(kernel='rbf', gamma=individual[0], nu=individual[1]) accuracy = 0 for i in range(5): X_train, X_test = train_test_split(X_TRAIN, test_size=0.2) clf.fit(X_train) accuracy += clf.score(X_test) return accuracy / 5, # 定义遗传算法工具箱 toolbox = base.Toolbox() toolbox.register("attr_float", lambda: np.random.uniform(MIN_PARAM, MAX_PARAM)) toolbox.register("individual", tools.initRepeat, creator.Individual, toolbox.attr_float, n=N_PARAMETER) toolbox.register("population", tools.initRepeat, list, toolbox.individual) toolbox.register("evaluate", evaluate) toolbox.register("mate", tools.cxBlend, alpha=0.5) toolbox.register("mutate", tools.mutGaussian, mu=0, sigma=1, indpb=0.1) toolbox.register("select", tools.selTournament, tournsize=3) # 定义精英机制 hall_of_fame = tools.HallOfFame(HALL_OF_FAME_SIZE) # 运行遗传算法 population = toolbox.population(n=POPULATION_SIZE) stats = tools.Statistics(lambda ind: ind.fitness.values) stats.register("avg", np.mean) stats.register("min", np.min) stats.register("max", np.max) population, logbook = algorithms.eaSimple(population, toolbox, cxpb=P_CROSSOVER, mutpb=P_MUTATION, ngen=MAX_GENERATIONS, stats=stats, halloffame=hall_of_fame) # 输出优化结果 best_individual = tools.selBest(population, k=1)[0] best_parameters = [] for param in best_individual: best_parameters.append(round(param, 2)) print("OneClassSVM params: gamma={}, nu={}".format(*best_parameters))

具体实现方法为，先定义一个函数，在函数中使用if语句判断nu的取值，并将nv调整为0或1。然后在创建评估函数时，使用这个函数对nv进行限制。代码示例如下： python # 定义限制函数 def limit_nv(nv, nu): if nu ...

def classification_svc(X_train_model, y_train): print("Fitting the classifier to the training set") t0 = time() param_grid = {'C': [1e3, 5e3, 1e4, 5e4, 1e5], 'gamma': [0.0001, 0.0005, 0.001, 0.005, 0.01, 0.1], } clf = GridSearchCV(SVC(kernel='rbf', class_weight='balanced'), param_grid) clf = clf.fit(X_train_model, y_train) print("done in %0.3fs" % (time() - t0)) print("Best estimator found by grid search:") print(clf.best_estimator_) return clf返回值怎么保存

clf = classification_svc(X_train, y_train) # 将分类器保存到文件 with open('classifier.pkl', 'wb') as f: pickle.dump(clf, f) # 从文件中加载分类器 with open('classifier.pkl', 'rb') as f: clf = ...

解析如下代码：from sklearn.svm import OneClassSVM from sklearn.model_selection import train_test_split import numpy as np from deap import creator, base, tools, algorithms # 生成随机数据作为样本 X = np.random.rand(100, 5) # 创建OneClassSVM分类器 clf = OneClassSVM() # 定义优化目标，这里使用评估分类器的准确率 creator.create("FitnessMax", base.Fitness, weights=(1.0,)) creator.create("Individual", list, fitness=creator.FitnessMax) # 定义一些算法参数 POPULATION_SIZE = 10 P_CROSSOVER = 0.9 P_MUTATION = 0.1 MAX_GENERATIONS = 50 HALL_OF_FAME_SIZE = 3 N_PARAMETER = 4 MIN_PARAM = 0.01 MAX_PARAM = 10.0 # 定义适应度评价函数，使用交叉验证计算准确率 def evaluate(individual): clf.set_params(kernel='rbf', gamma=individual[0], nu=individual[1]) accuracy = 0 for i in range(5): X_train, X_test = train_test_split(X, test_size=0.3) clf.fit(X_train) accuracy += clf.score(X_test) return accuracy / 5, # 定义遗传算法工具箱 toolbox = base.Toolbox() toolbox.register("attr_float", lambda: np.random.uniform(MIN_PARAM, MAX_PARAM)) toolbox.register("individual", tools.initRepeat, creator.Individual, toolbox.attr_float, n=N_PARAMETER) toolbox.register("population", tools.initRepeat, list, toolbox.individual) toolbox.register("evaluate", evaluate) toolbox.register("mate", tools.cxBlend, alpha=0.5) toolbox.register("mutate", tools.mutGaussian, mu=0, sigma=1, indpb=0.1) toolbox.register("select", tools.selTournament, tournsize=3) # 定义精英机制 hall_of_fame = tools.HallOfFame(HALL_OF_FAME_SIZE) # 运行遗传算法 population = toolbox.population(n=POPULATION_SIZE) stats = tools.Statistics(lambda ind: ind.fitness.values) stats.register("avg", np.mean) stats.register("min", np.min) stats.register("max", np.max) population, logbook = algorithms.eaSimple(population, toolbox, cxpb=P_CROSSOVER, mutpb=P_MUTATION, ngen=MAX_GENERATIONS, stats=stats, halloffame=hall_of_fame) # 输出优化结果 best_individual = tools.selBest(population, k=1)[0] best_parameters = [] for param in best_individual: best_parameters.append(round(param, 2)) print("OneClassSVM params: gamma={}, nu={}".format(*best_parameters))

- sklearn 库中的 train_test_split 函数，用于划分数据集。 - numpy 库，用于支持多维数组和矩阵运算。 - deap 库中的 creator、base、tools 和 algorithms 模块，用于遗传算法和演化计算。整体来说，这段代码的...

为什么这段python代码用不了？它报错的是AttributeError: 'OneClassSVM' object has no attribute 'score' 错误代码为population, logbook = algorithms.eaSimple(population, toolbox, cxpb=P_CROSSOVER, mutpb=P_MUTATION, ngen=MAX_GENERATIONS, stats=stats, halloffame=hall_of_fame)完整代码如下：from sklearn.svm import OneClassSVM from sklearn.model_selection import train_test_split import numpy as np from deap import creator, base, tools, algorithms # 生成随机数据作为样本 X = np.random.rand(100, 5) # 创建OneClassSVM分类器 clf = OneClassSVM() # 定义优化目标，这里使用评估分类器的准确率 creator.create("FitnessMax", base.Fitness, weights=(1.0,)) creator.create("Individual", list, fitness=creator.FitnessMax) # 定义一些算法参数 POPULATION_SIZE = 10 P_CROSSOVER = 0.9 P_MUTATION = 0.1 MAX_GENERATIONS = 50 HALL_OF_FAME_SIZE = 3 N_PARAMETER = 4 MIN_PARAM = 0.01 MAX_PARAM = 10.0 # 定义适应度评价函数，使用交叉验证计算准确率 def evaluate(individual): clf.set_params(kernel='rbf', gamma=individual[0], nu=individual[1]) accuracy = 0 for i in range(5): X_train, X_test = train_test_split(X, test_size=0.3) clf.fit(X_train) accuracy += clf.score(X_test) return accuracy / 5, # 定义遗传算法工具箱 toolbox = base.Toolbox() toolbox.register("attr_float", lambda: np.random.uniform(MIN_PARAM, MAX_PARAM)) toolbox.register("individual", tools.initRepeat, creator.Individual, toolbox.attr_float, n=N_PARAMETER) toolbox.register("population", tools.initRepeat, list, toolbox.individual) toolbox.register("evaluate", evaluate) toolbox.register("mate", tools.cxBlend, alpha=0.5) toolbox.register("mutate", tools.mutGaussian, mu=0, sigma=1, indpb=0.1) toolbox.register("select", tools.selTournament, tournsize=3) # 定义精英机制 hall_of_fame = tools.HallOfFame(HALL_OF_FAME_SIZE) # 运行遗传算法 population = toolbox.population(n=POPULATION_SIZE) stats = tools.Statistics(lambda ind: ind.fitness.values) stats.register("avg", np.mean) stats.register("min", np.min) stats.register("max", np.max) population, logbook = algorithms.eaSimple(population, toolbox, cxpb=P_CROSSOVER, mutpb=P_MUTATION, ngen=MAX_GENERATIONS, stats=stats, halloffame=hall_of_fame) # 输出优化结果 best_individual = tools.selBest(population, k=1)[0] best_parameters = [] for param in best_individual: best_parameters.append(round(param, 2)) print("OneClassSVM params: gamma={}, nu={}".format(*best_parameters))

这段Python代码中可能使用了OneClassSVM模块的score()函数，但OneClassSVM模块并没有该属性（AttributeError: 'OneClassSVM' object has no attribute 'score'）。需要检查代码中使用的函数是否正确，并检查模块是否...

帮我在下面的代码中添加高斯优化，原代码如下：import numpy as np from sklearn.svm import OneClassSVM from scipy.optimize import minimize def fitness_function(x): """ 定义适应度函数，即使用当前参数下的模型进行计算得到的损失值 """ gamma, nu = x clf = OneClassSVM(kernel='rbf', gamma=gamma, nu=nu) clf.fit(train_data) y_pred = clf.predict(test_data) # 计算错误的预测数量 error_count = len([i for i in y_pred if i != 1]) # 将错误数量作为损失值进行优化 return error_count def genetic_algorithm(x0, bounds): """ 定义遗传算法优化函数 """ population_size = 20 # 种群大小 mutation_rate = 0.1 # 变异率 num_generations = 50 # 迭代次数 num_parents = 2 # 选择的父代数量 num_elites = 1 # 精英数量 num_genes = x0.shape[0] # 参数数量 # 随机初始化种群 population = np.random.uniform(bounds[:, 0], bounds[:, 1], size=(population_size, num_genes)) for gen in range(num_generations): # 选择父代 fitness = np.array([fitness_function(x) for x in population]) parents_idx = np.argsort(fitness)[:num_parents] parents = population[parents_idx] # 交叉 children = np.zeros_like(parents) for i in range(num_parents): j = (i + 1) % num_parents mask = np.random.uniform(size=num_genes) < 0.5 children[i, mask] = parents[i, mask] children[i, ~mask] = parents[j, ~mask] # 变异 mask = np.random.uniform(size=children.shape) < mutation_rate children[mask] = np.random.uniform(bounds[:, 0], bounds[:, 1], size=np.sum(mask)) # 合并种群 population = np.vstack([parents, children]) # 选择新种群 fitness = np.array([fitness_function(x) for x in population]) elites_idx = np.argsort(fitness)[:num_elites] elites = population[elites_idx] # 输出结果 best_fitness = fitness[elites_idx[0]] print(f"Gen {gen+1}, best fitness: {best_fitness}") return elites[0] # 初始化参数 gamma0, nu0 = 0.1, 0.5 x0 = np.array([gamma0, nu0]) bounds = np.array([[0.01, 1], [0.01, 1]]) # 调用遗传算法优化 best_param = genetic_algorithm(x0, bounds) # 在最佳参数下训练模型，并在测试集上进行测试 clf = OneClassSVM(kernel='rbf', gamma=best_param[0], nu=best_param[1]) clf.fit(train_data) y_pred = clf.predict(test_data) # 计算错误的预测数量 error_count = len([i for i in y_pred if i != 1]) print(f"Best fitness: {error_count}, best parameters: gamma={best_param[0]}, nu={best_param[1]}")

def fitness_function(x): """ 定义适应度函数，即使用当前参数下的模型进行计算得到的损失值 """ gamma, nu = x clf = OneClassSVM(kernel='rbf', gamma=gamma, nu=nu) clf.fit(train_data) y_pred =...

多核SVM_SVM分类python_多核SVM_

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X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.3, random_state=42) # 创建SVM分类器 clf = svm.SVC(kernel='linear') # 训练模型 clf.fit(X_train, y_train) # 预测 predictions = ...

用pycharm写，用IPython解释器编写 SMO 算法实现线性 SVM 分类器，对 iris 数据集进行二分类。具体内容：（1）选取两个特征和两类数据进行二分类。注意：二分类标签为 1 和-1。（2）划分数据（分成训练集和数据集）（3）数据归一化（4）训练模型（参考程序模板：SVM_numpy_template.py）（5）输出：SVM 对偶问题目标函数的最优解𝛼，决策函数的参数和截距，支持向量等。

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y_pred_train = svm.predict(X_train) y_pred_test = svm.predict(X_test) train_acc = np.mean(y_train == y_pred_train) test_acc = np.mean(y_test == y_pred_test) print('train_acc:', train_acc) print('test_...

Python基于yolo的健身姿势检测与姿态矫正建议系统源代码+使用说明

Python基于yolo的健身姿势检测与姿态矫正建议系统源代码+使用说明 model:保存模型参数 config.yaml:配置文件 resource:输入文件夹，具有固定的目录结构（动作-视角-标准/错误点） output:输出文件夹，保持和resource相同的目录结构 main.py:实现resource2output方法,将resource中的资源全部提取数据并输出（csv格式）到output的相应位置 tasks:任务文件夹，对于不同的健身任务，分别实现标准性判别方法 keypoint.py:是对yolo模型返回的节点进行对象封装，其中的Keypoint对象封装了返回结果（是一个数组）中各关节位置对应数组中的位置，这样就不需要通过下标直接获取节点，而是通过例如get("l_elbow")的实例方法获取节点 pull_up.py:为具体健身任务实现标准性判别方法，这里是对引体向上的处理 task_processor.py由于main.py是在对resource文件夹中所有资源进行处理，不同的方法将对应不同的处理函数，task_processor.py中实现了TaskProces

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