question: public Object2IntOpenHashMap < int [ ] > supportMap ( ) { List < ItemSet > itemSets = learn ( ) ; Object2IntOpenHashMap < int [ ] > confidenceMap = new Object2IntOpenHashMap < > ( itemSets . size ( ) ) ; for ( ItemSet itemSet : itemSets ) { confidenceMap . put ( itemSet . items , itemSet . support ) ; } return confidenceMap ; }
target:  Returns a map of discovered ItemSets and their support, where the support is the number of times the combination appears in the input data