Support Vector Machine

版本 1.0.0.0 (204.3 KB) 作者: Bhartendu
SVM (Linearly Seperable Data) using linear Kernel with Gradient ascent

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更新时间 2017/5/28

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Refer: An Introduction to Support Vector Machines and Other Kernel-based Learning Methods by Nello Cristianini and John Shawe-Taylor]
In this demo: training or cross-validation of a support vector machine (SVM) model for two-class (binary) classification on a low dimensional data set.

The training algorithm only depend on the data through dot products in H, i.e. on functions of the form Φ(x_i)·Φ(x_j). Now if there were a “kernel function” K such that
K(x_i,x_j) = Φ(x_i)·Φ(x_j),
we would only need to use K in the training algorithm, and would never need to explicitly even know what Φ is. One example is radial basis functions (RBF) or gaussian kernels where, H is infinite dimensional, so it would not be very easy to work with Φ explicitly.

Training the model requires the choice of:
• the kernel function, that determines the shape of the decision surface
• parameters in the kernel function (eg: for gaussian kernel:variance of the Gaussian, for polynomial kernel: degree of the polynomial)
• the regularization parameter λ.

Related Examples:
1. AdaBoost
https://in.mathworks.com/matlabcentral/fileexchange/63156-adaboost

2. SVM using various kernels
https://in.mathworks.com/matlabcentral/fileexchange/63033-svm-using-various-kernels

3. SVM for nonlinear classification
https://in.mathworks.com/matlabcentral/fileexchange/63024-svm-for-nonlinear-classification

4. SMO
https://in.mathworks.com/matlabcentral/fileexchange/63100-smo--sequential-minimal-optimization-

引用格式

Bhartendu (2022). Support Vector Machine (https://www.mathworks.com/matlabcentral/fileexchange/63158-support-vector-machine), MATLAB Central File Exchange. 检索来源 .

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