Add install instruction in README
ItemOcc is encoded onto ItemId by PFPG Mapper
Add NOTE and some TODOs
Update FPGrowthIds.growth()
Add field attrWithDistToCount to FPTree class
Modify NOTE
Add some comments for readability
Update NOTE and add a testcase
Update some TODOs
Fix typo, forget to add ;
Next: work on createMoreFreqConditionalTree
Finish isSubPatternOf
Fix some typo and errors
Modify OutputConverter
Change encoding
In the middle of fixing bugs
Fix runtime error
CreateMoreFreqCondTree still has bug
Change comments, next task: modify accumulate()
Fix the distSum problem