# Package org.apache.sysds.runtime.compress.utils

Class Summary
ABitmap
Bitmap: Uncompressed representation of one or more columns in bitmap format.
BitmapLossy: Uncompressed but Quantized representation of contained data.
CustomHashMap: This class provides a memory-efficient base for Custom HashMaps for restricted use cases.
DblArray: Helper class used for bitmap extraction.
DblArrayIntListHashMap: This class provides a memory-efficient replacement for `HashMap<DblArray,IntArrayList>` for restricted use cases.
DoubleIntListHashMap: This class provides a memory-efficient replacement for `HashMap<Double,IntArrayList>` for restricted use cases.
IntArrayList: This class provides a memory-efficient replacement for `ArrayList<Integer>` for restricted use cases.
IntIntMap: This int it map supports incrementing entries and only this.
LinearAlgebraUtils: This library contains all vector primitives that are used in compressed linear algebra.
MultiColBitmap: Uncompressed representation of one or more columns in bitmap format.
Util

Enum Summary
ABitmap.BitmapType