more comments and do merge also for AbstractBinning
refactor EqualPopulationBinning to make it run faster
do some optimization for find min interval
add comments
fix the bug when inserting there is no header and tail
add the check size back
if the count bin of categorical variable exceed 4000, then drop it
add basic code for variable selection
implement WrapperMaster(Worker)Conductor
add register voted variables selection and expose option to user
update VarSelOuput, save seleted variabels
fix data loading issue for variable selection
Fix bugs to make sure voted var selection works well.
code optimazation
Merge branch 'hotfix-kevin-bugs' of https://github.com/ShifuML/shifu into hotfix-kevin-bugs
add persist columnconfig
fix conflict
prevent multiply running variable select bug
add more logs for debuging
create empty list to avoid null point exception