from sklearn.model_selection import GridSearchCV print("Searching the best parameters for SVC ...") param_grid = {'C': [1, 5, 10, 50, 100], 'gamma': [0.0001, 0.0005, 0.001, 0.005, 0.01]} clf = GridSearchCV(SVC(kernel='rbf', class_weight='balanced'), param_grid, verbose=2, n_jobs=4) clf = clf.fit(X_train_pca, y_train) print("Best parameters found by grid search:") print(clf.best_params_)c
时间: 2024-04-02 09:36:13 浏览: 15
这段代码是用来进行支持向量机(SVM)分类器的参数调优,使用了网格搜索(Grid Search)算法。其中,param_grid 定义了不同的参数组合,clf 是使用了径向基函数核(kernel='rbf')和均衡的类权重(class_weight='balanced')的 SVM 分类器;X_train_pca 和 y_train 分别是训练集的特征和标签。GridSearchCV 函数对不同参数组合进行交叉验证,并返回最优参数组合。最后输出最优参数组合的值。
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def main(self): popobj = [] self.ng_best = np.zeros((1, self.var_num))[0] for gen in range(self.NGEN): self.update_operator(self.pop_size) popobj.append(self.fitness(self.g_best)) print('############ Generation {} ############'.format(str(gen + 1))) if self.fitness(self.g_best) > self.fitness(self.ng_best): self.ng_best = self.g_best.copy() print('最好的位置:{}'.format(self.ng_best)) print('最大的函数值:{}'.format(self.fitness(self.ng_best))) print("---- End of (successful) Searching ----") plt.figure() fig = plt.gcf() fig.set_size_inches(18.5, 10.5) plt.title("Figure1") plt.xlabel("iterators", size=14) plt.ylabel("fitness", size=14) t = [t for t in range(self.NGEN)] plt.plot(t, popobj, color='b', linewidth=2) plt.show()
这段代码是一个实现粒子群算法(PSO)的主函数。算法的输入包括种群大小pop_size、迭代次数NGEN、变量个数var_num、更新算子update_operator和适应度函数fitness。算法首先初始化全局最优解ng_best和种群中每个个体的位置和速度,然后进入迭代过程。在每次迭代中,算法使用update_operator更新种群中每个个体的位置和速度,并计算每个个体的适应度值。将每次迭代中全局最优解ng_best和每个个体的适应度值保存在popobj列表中,并输出当前迭代次数、最好的位置和最大的函数值。最后,将每次迭代中种群中所有个体的适应度值popobj绘制成折线图。
需要注意的是,这段代码中存在一些变量和函数的调用,需要结合完整的代码才能理解其含义。
No primary or default constructor found for class com.bizsoft.winqframe.webtags.Grid.Searching
I'm sorry, but I cannot provide a solution to a specific code issue without more context or code details. However, I can provide some general guidance on the error message you mentioned.
The error message "No primary or default constructor found for class" typically occurs when you try to create an instance of a class that does not have a constructor or does not have a default constructor.
In your case, it seems that you are trying to create an instance of the class `com.bizsoft.winqframe.webtags.Grid.Searching`, but the class does not have a constructor or a default constructor.
To resolve this issue, you can try one of the following:
1. Add a constructor to the `Searching` class: You can add a constructor to the `Searching` class that takes the required parameters, or add a default constructor without any parameters. For example:
```java
public class Searching {
// constructor with parameters
public Searching(String param1, int param2) {
// constructor implementation
}
// default constructor
public Searching() {
// constructor implementation
}
}
```
2. Modify the code that creates an instance of the `Searching` class: If you don't have access to modify the `Searching` class, you can check the code that tries to create an instance of the class and ensure that it is using a valid constructor. For example:
```java
Searching searching = new Searching("param1", 123); // using constructor with parameters
```
Please provide more information or code if you need further assistance with this issue.