中文说明：
2维线性判别进行人脸识别的程序，很不错！采用ORL人脸库，取每人的1、3、5、7、9五幅图像作为训练图像，其余作为测试图像，进行二维线性判别。计算出特征向量矩阵，降序排列后，取前d（d=2,4,6，……，20）个特征向量组成的矩阵作为变换矩阵，对训练集合测试集进行特征重建，最后采用最近邻分类器。附有实验的结果。
English Description：
2-dimensional linear discrimination for face recognition program, very good! Using ORL face database, take each person's 1, 3, 5, 7 and 9 images as training images and the rest as test images for two-dimensional linear discrimination. Calculate the eigenvector matrix, arrange it in descending order, take the matrix composed of the first D (d = 2,4,6,..., 20) eigenvectors as the transformation matrix, reconstruct the features of the training set and the test set, and finally use the nearest neighbor classifier. The experimental results are attached