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

Class Summary
ReaderColumnSelection: Base class for all column selection readers.
ReaderColumnSelectionBitSet
ReaderColumnSelectionDenseMultiBlock
ReaderColumnSelectionDenseMultiBlockTransposed
ReaderColumnSelectionDenseSingleBlock
ReaderColumnSelectionDenseSingleBlockTransposed
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.
ReaderColumnSelectionSparseTransposed: 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.
ReaderCompressedSelection