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1.
Support vector machine (SVM) is a state-of-art classification tool with good accuracy due to its ability to generate nonlinear model. However, the nonlinear models generated are typically regarded as incomprehensible black-box models. This lack of explanatory ability is a serious problem for practical SVM applications which require comprehensibility. Therefore, this study applies a C5 decision tree (DT) to extract rules from SVM result. In addition, a metaheuristic algorithm is employed for the feature selection. Both SVM and C5 DT require expensive computation. Applying these two algorithms simultaneously for high-dimensional data will increase the computational cost. This study applies artificial bee colony optimization (ABC) algorithm to select the important features. The proposed algorithm ABC–SVM–DT is applied to extract comprehensible rules from SVMs. The ABC algorithm is applied to implement feature selection and parameter optimization before SVM–DT. The proposed algorithm is evaluated using eight datasets to demonstrate the effectiveness of the proposed algorithm. The result shows that the classification accuracy and complexity of the final decision tree can be improved simultaneously by the proposed ABC–SVM–DT algorithm, compared with genetic algorithm and particle swarm optimization algorithm.  相似文献   

2.
基于飞机的历史QAR(Quick Access Recorder,快速存取记录器)数据构建数据集,对数据集进行参数选择、数据预处理、数据集划分等操作,目的是提高模型的运行效率和准确度;使用改进粒子群算法对SVM(Support Vector Machines,支持向量机)的分类参数进行优化,使模型的分类效果达到最优;为了验证模型的故障检测效果,将收集到的某航空公司A320系列飞机的引气系统QAR数据进行预处理并导入模型故障检测,最终将检测结果进行验证.结果表明,使用改进粒子群算法优化的SVM对飞机引气系统进行故障检测,可以提高故障检测的准确率,提前发现潜在的故障,减少故障发生的可能性.  相似文献   

3.
针对红外甲烷传感器在工业现场测量时易受到温度、湿度以及类似气体等非目标变量的影响,提出了一种基于人工蜂群和粒子群混合优化算法(ABC-PSO)的支持向量机模型(ABC-PSO-ε-SVM)对其进行校正.将ABC算法与PSO算法并行组合构成混合优化算法,能够感知非目标变量的变化,快速、准确地搜索到SVM参数.实验中,采用红外甲烷传感器对0%~5.05%浓度的16组标准甲烷气体进行测量,将其中11组数据作为训练集,5组数据作为测试集,建立e-SVM回归校正模型并进行预测.结果表明:模型的回归拟合效果好,预测精度比单一优化算法的SVM模型高.  相似文献   

4.
Rough particle swarm optimization and its applications in data mining   总被引:1,自引:1,他引:0  
This paper proposes a novel particle swarm optimization algorithm, rough particle swarm optimization algorithm (RPSOA), based on the notion of rough patterns that use rough values defined with upper and lower intervals that represent a range or set of values. In this paper, various operators and evaluation measures that can be used in RPSOA have been described and efficiently utilized in data mining applications, especially in automatic mining of numeric association rules which is a hard problem.  相似文献   

5.
潘丰  毛志亮 《控制工程》2011,18(2):267-269,274
支持向量机(SVM)建模的拟合精度和泛化能力取决于相关参数的选取,目前SVM中的参数的寻优一般只针对惩罚系数和核参数,而混合核函数的引入,使SVM增加了一个可调参数.针对混合核函数SVM的多参数选择问题,提出利用具有较强全局搜索能力的混沌粒子群(CPSO)优化算法对混合核函数SVM建模过程中的重要参数进行优化调整,每一...  相似文献   

6.
陈树  张继中 《测控技术》2018,37(4):6-10
针对传统粒子群算法(Particle Swarm Optimization,PSO)对支持向量机(Support Vector Machine,SVM)参数寻优时的低效问题,运用了自适应均值粒子群算法(Adaptive Mean Particle Swarm Optimization,MAPSO)对SVM参数进行优化(MAPSO-SVM算法).采用自适应策略,引入了余弦函数、非线性动态调整惯性因子,每次进化都根据种群中粒子的适应度值大小将粒子分为3个等级,对每个等级的粒子赋予相应的惯性因子,将PSO算法速度更新方程中的个体历史最优位置和全局最优位置用它们的线性组合代替.分别用SVM、PSO-SVM和MAPSO-SVM算法对UCI中不同数据集进行实验测试,结果表明MAPSO-SVM算法比SVM和PSO-SVM算法的分类效果更好,分类准确率比SVM和PSO-SVM算法分别平均提高了14.7290%和1.8347%,同时与PSO-SVM算法相比,算法的收敛精度和效率更高.  相似文献   

7.
针对粗糙集不能较好地处理连续型属性的问题,结合粗糙集理论和粒子群算法,提出基于自适应混合禁忌搜索粒子群的连续属性离散化算法。首先,该算法通过对参数的自适应更新操作,从而避免了粒子群出现早熟的现象;然后将粒子群当代得到的全局最优粒子送入禁忌算法中进行优化,有效地提升了算法的局部探索能力;在兼顾决策表系统一致性的同时,将划分的断点初始化为一群随机粒子,通过改进后粒子群的自我迭代得到最佳的离散化划分点。实验结果表明,与其他结合粗糙集的离散化算法相比,该算法具有更高的规则分类精度和较少的离散化断点个数,对连续属性的离散化效果较好。  相似文献   

8.
传统智能故障检测模型中算法初始参数复杂,选取难度较大,缺乏自学习、自组织能力、泛化能力弱,极易陷入局部极小值、算法单一等缺点.组合应用智能检测算法可整合不同算法优势,避免单一算法缺点,为此,文中提出支持向量机算法与改进粒子群算法相结合的电机故障检测模型:以电机故障特征频率特征数据为基础,首先使用改进全局求解性能的粒子群算法求解影响支持向量机分类检测性能的最佳参数,然后把最佳参数应用于的擅长模式识别的支持向量机算法,进行样本数据的训练,构建故障检测模型;最后,使用故障检测模型对电机的状态进行预测.实验结果表明,采用该方法进行故障检测的准确率,比传统的神经网络方法提高17%,比纯支持向量机算法提高3.33%.  相似文献   

9.
Coronary artery disease (CAD) is one of the major causes of mortality worldwide. Knowledge about risk factors that increase the probability of developing CAD can help to understand the disease better and assist in its treatment. Recently, modern computer‐aided approaches have been used for the prediction and diagnosis of diseases. Swarm intelligence algorithms like particle swarm optimization (PSO) have demonstrated great performance in solving different optimization problems. As rule discovery can be modelled as an optimization problem, it can be mapped to an optimization problem and solved by means of an evolutionary algorithm like PSO. An approach for discovering classification rules of CAD is proposed. The work is based on the real‐world CAD data set and aims at the detection of this disease by producing the accurate and effective rules. The proposed algorithm is a hybrid binary‐real PSO, which includes the combination of categorical and numerical encoding of a particle and a different approach for calculating the velocity of particles. The rules were developed from randomly generated particles, which take random values in the range of each attribute in the rule. Two different feature selection methods based on multi‐objective evolutionary search and PSO were applied on the data set, and the most relevant features were selected by the algorithms. The accuracy of two different rule sets were evaluated. The rule set with 11 features obtained more accurate results than the rule set with 13 features. Our results show that the proposed approach has the ability to produce effective rules with highest accuracy for the detection of CAD.  相似文献   

10.
This paper presents a swarm intelligence based parameter optimization of the support vector machine (SVM) for blind image restoration. In this work, SVM is used to solve a regression problem. Support vector regression (SVR) has been utilized to obtain a true mapping of images from the observed noisy blurred images. The parameters of SVR are optimized through particle swarm optimization (PSO) technique. The restoration error function has been utilized as the fitness function for PSO. The suggested scheme tries to adapt the SVM parameters depending on the type of blur and noise strength and the experimental results validate its effectiveness. The results show that the parameter optimization of the SVR model gives better performance than conventional SVR model as well as other competent schemes for blind image restoration.  相似文献   

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