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

- Interface Summary
  Interface | Description
  --- | ---
  Util |

- Class Summary
  Class | Description
  --- | ---
  DArrCounts |
  DblArray | Helper class used for bitmap extraction.
  DblArrayCountHashMap |
  DblArrayIntListHashMap |
  DblArrayIntListHashMap.DArrayIListEntry |
  DCounts |
  DoubleCountHashMap |
  DoubleIntListHashMap | This class provides a memory-efficient replacement for `HashMap<Double,IntArrayList>` for restricted use cases.
  DoubleIntListHashMap.DIListEntry |
  IntArrayList |