Package org.apache.sysml.runtime.compress

Class Summary

Class	Description
BitmapEncoder	Static functions for encoding bitmaps in various ways.
ColGroup	Class that stores information about a column group within a compressed matrix block.
ColGroupDDC	Class to encapsulate information about a column group that is encoded with dense dictionary encoding (DDC).
ColGroupDDC1	Class to encapsulate information about a column group that is encoded with dense dictionary encoding (DDC) using 1 byte codes.
ColGroupDDC2	Class to encapsulate information about a column group that is encoded with dense dictionary encoding (DDC) using 2 byte codes.
ColGroupOffset	Base class for column groups encoded with various types of bitmap encoding.
ColGroupOLE	Class to encapsulate information about a column group that is encoded with simple lists of offsets for each set of distinct values.
ColGroupRLE	A group of columns compressed with a single run-length encoded bitmap.
ColGroupUncompressed	Column group type for columns that are stored as dense arrays of doubles.
ColGroupValue	Base class for column groups encoded with value dictionary.
CompressedMatrixBlock	Experimental version of MatrixBlock that allows a compressed internal representation.
CompressedMatrixBlock.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.
UncompressedBitmap	Uncompressed representation of one or more columns in bitmap format.

Enum Summary

Enum	Description
ColGroup.CompressionType