OSR for RGB data 'xxx_kwn.mat

[ShellyShellyShellyShelly]

hello，how this file 'xxx_kwn.mat' is generated in OSR for RGB data, i didn't find this file

# load data
data = load_data(join(args.load_dir, args.dataset+'_kwn.mat'))
x, y = format_data(data, key_x='x', key_y='y', num_labels=num_categories)