顺序前进法特征选择，顺序后退法特征选择计算正确率-Sequential forward feature selection method, the sequence backward feature selection method to calculate the correct rate

主要完成图像特征出提取，包括5个特征选择算法：SFS，SBS，SFBS-Descr iption The DEMO includes 5 feature selection algorithms: Sequential Forward Selection (SFS) Sequential Floating Forward Selection (SFFS) Sequential Backward Selection (SBS) Sequential Floating Bac