A simple implementation for LDA
Run command
wget -O Training_Data_Img91.mat "https://uflorida-my.sharepoint.com/:u:/g/personal/ding_chi_ufl_edu/EdANV3t23S5FiP_XkmXQJF0BpIkGVZE3dPMxas2xSLb4vw?e=rdTpAV&download=1"
to obtain the data.