There are five important functions.
1) loadPaths: it contains the path of the database, BGMM Toolbox, and the files for loading the face features.
2) makeDatabase: it makes folders for the users a where necessary information are saved.
3) trainAll: it uses the functions train and trainWorld. It does what its name says.
4) testAll: compute the likelihoods and saves them in mat files. It computes all the possible users.
5) EER: It is partially ready.

To get started

Edit loadPaths.m and set the paths correctly for your installation.

matlab < main.m

A better option is to do:

nice -n19 matlab -nodesktop -nosplash < main.m

or type "main" in the matlab prompt