trainlssvm函数用于训练模型，主要有两种使用形式：
[alpha, b] = trainlssvm({X,Y,type,gam,kernel_par,kernel,preprocess})
model = trainlssvm(model)或者model = trainlssvm(model, X, Y)
X和Y分别是训练样本集的输入和输出数据。(The trainlssvm function is used for training models, and there are two main forms of use:
[alpha, b] = trainlssvm ({X, Y, type, GAM, kernel_par, kernel, preprocess})
Model = trainlssvm (model) or model = trainlssvm (model, X, Y)
X and Y are the input and output data of the training sample set, respectively.)