说明：  libsvm工具箱的主要函数为svmtrain和svmpredict，其中一些参数设置可以按照svm的类型和核函数所支持的参数进行任意组合，如果设置的参数在函数或svm类型中没有也不会产生影响，程序不会接受该参数，程序主要用一个例子来说明主要参数的使用。
(The main functions of the libsvm toolbox are svmtrain and svmpredict, some of which can be arbitrarily combined according to the type of svm and the parameters supported by the kernel function. If the parameter is not set in the function or svm type, the program does not affect Will accept the parameters, the program mainly used an example to illustrate the use of the main parameters.)