GeneralUtil ： tells about how to build general machine learning model

SVM.java : svm classification model

class SVM

method: trainModel() --- use training set to build svm model
method: predictData() --- predict new data by trained svm model

GBDT.java: GBDT regression model

class GBDT

method: trainModel() --- use training set to build GBDT model
method: predict() --- predict new data by trained GBDT model