org.apache.sysds.runtime.compress.readers

Class ReaderColumnSelectionSparse

java.lang.Object

org.apache.sysds.runtime.compress.readers.ReaderColumnSelection

org.apache.sysds.runtime.compress.readers.ReaderColumnSelectionSparse

public class ReaderColumnSelectionSparse
extends ReaderColumnSelection

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. The current compression algorithm treats the zero-value in a sparse matrix like any other value.

Constructor Summary

Constructors

Constructor and Description
ReaderColumnSelectionSparse(MatrixBlock data, int[] colIndexes) Reader of sparse matrix blocks for compression.

Method Summary

Methods inherited from class org.apache.sysds.runtime.compress.readers.ReaderColumnSelection

createCompressedReader, createReader, getCurrentRowIndex, nextRow

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ReaderColumnSelectionSparse

public ReaderColumnSelectionSparse(MatrixBlock data,
                                   int[] colIndexes)

Reader of sparse matrix blocks for compression. This reader should not be used if the input data is not sparse

Parameters:

data - The transposed and sparse matrix

colIndexes - The column indexes to combine