tuning performance: using TList.toArray and changing TIntList to TIntSet
maintain reverse index when sorter.removeLast() invoked
improve get() method
refactor thread factory
refactor sorter creation logic
refactor sorter class
remove wrong clean logic
add prefix to threads
add sparse lenghts
change sparse score interface
write the logic of reverse indexer
Merge branch 'develop' of git@github.com:guokr/simbase.git into develop
remove constraints on vectors in dense vector set
remove constraints on vectors in sparse vector set
reuse array among different add ops
update README