# Package org.apache.sysds.runtime.compress

- Class Summary
  Class | Description
  --- | ---
  AbstractCompressedMatrixBlock |
  BitmapEncoder | Static functions for encoding bitmaps in various ways.
  CompressedMatrixBlock |
  CompressedMatrixBlockFactory | Factory pattern to construct a CompressedMatrixBlock.
  CompressionSettings | Compression Settings class, used as a bundle of parameters inside the Compression framework.
  CompressionSettingsBuilder | Builder pattern for Compression Settings.
  CompressionStatistics |
  ReaderColumnSelection | Base class for all column selection readers.
  ReaderColumnSelectionDense |
  ReaderColumnSelectionDenseSample | considers only a subset of row indexes
  ReaderColumnSelectionSparse | Used to extract the values at certain indexes from each row in a sparse matrix Keeps returning all-zeros arrays until reaching the last possible index.

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