Face recognition, Digit recognition and Text recognition
$ ./a.out digitdata/trainingimages digitdata/traininglabels digitdata/testimages digitdata/testlabels
$ ./a.out facedata/facedatatrain facedata/facedatatrainlabels facedata/facedatatest facedata/facedatatestlabels
$ ./a.out 8newsgroups/8.trainingdata.txt 8newsgroups/8.testingdata.txt