utils: tutorial edits for utils
utils: tutorial edits for utils

cvfish/vlfeat,qubick/vlfeat,qubick/vlfeat,mylxiaoyi/vlfeat,richarddzh/vlfeat,WangDequan/vlfeat,qubick/vlfeat,CansenJIANG/vlfeat,vlfeat/vlfeat,erexhepa/vlfeat,CansenJIANG/vlfeat,qubick/vlfeat,rxl194/vlfeat,hongzhili/vlfeat,WangDequan/vlfeat,qubick/vlfeat,hongzhili/vlfeat,j-bo/vlfeat,erexhepa/vlfeat,erexhepa/vlfeat,mylxiaoyi/vlfeat,j-bo/vlfeat,CansenJIANG/vlfeat,qubick/vlfeat,j-bo/vlfeat,vlfeat/vlfeat,hongzhili/vlfeat,mylxiaoyi/vlfeat,richarddzh/vlfeat,cvfish/vlfeat,cvfish/vlfeat,richarddzh/vlfeat,j-bo/vlfeat,WangDequan/vlfeat,rxl194/vlfeat,erexhepa/vlfeat,vlfeat/vlfeat,WangDequan/vlfeat,hongzhili/vlfeat,mylxiaoyi/vlfeat,rxl194/vlfeat,CansenJIANG/vlfeat,hongzhili/vlfeat,hongzhili/vlfeat,richarddzh/vlfeat,cvfish/vlfeat,mylxiaoyi/vlfeat,richarddzh/vlfeat,vlfeat/vlfeat,CansenJIANG/vlfeat,mylxiaoyi/vlfeat,vlfeat/vlfeat,erexhepa/vlfeat,WangDequan/vlfeat,richarddzh/vlfeat,erexhepa/vlfeat,cvfish/vlfeat,CansenJIANG/vlfeat,rxl194/vlfeat,vlfeat/vlfeat,WangDequan/vlfeat,cvfish/vlfeat,j-bo/vlfeat,rxl194/vlfeat,rxl194/vlfeat