Package org.apache.sysds.runtime.data

Class SparseBlockFactory

java.lang.Object

org.apache.sysds.runtime.data.SparseBlockFactory

public abstract class SparseBlockFactory
extends Object

Constructor Summary

Constructors

Constructor	Description
SparseBlockFactory()

Method Summary

Modifier and Type	Method	Description
static SparseBlock	copySparseBlock(SparseBlock.Type type, SparseBlock sblock, boolean forceCopy)
static SparseBlock	createFromArray(double[] valsDense, int nCol, int nnz)	Create a sparse block from an array.
static SparseBlock	createIdentityMatrix(int nRowCol)
static SparseBlock	createIdentityMatrixWithEmptyRow(int nRowCol)
static SparseBlock	createSparseBlock(int rlen)
static SparseBlock	createSparseBlock(SparseBlock.Type type, int rlen)
static SparseBlock	createSparseBlock(SparseBlock.Type type, SparseRow row)
static long	estimateSizeSparseInMemory(SparseBlock.Type type, long nrows, long ncols, double sparsity)
static SparseBlock.Type	getSparseBlockType(SparseBlock sblock)
static boolean	isSparseBlockType(SparseBlock sblock, SparseBlock.Type type)

Methods inherited from class java.lang.Object

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

Constructor Detail

SparseBlockFactory

public SparseBlockFactory()

Method Detail

createSparseBlock

public static SparseBlock createSparseBlock(int rlen)

createSparseBlock

public static SparseBlock createSparseBlock(SparseBlock.Type type,
                                            int rlen)

createSparseBlock

public static SparseBlock createSparseBlock(SparseBlock.Type type,
                                            SparseRow row)

copySparseBlock

public static SparseBlock copySparseBlock(SparseBlock.Type type,
                                          SparseBlock sblock,
                                          boolean forceCopy)

isSparseBlockType

public static boolean isSparseBlockType(SparseBlock sblock,
                                        SparseBlock.Type type)

getSparseBlockType

public static SparseBlock.Type getSparseBlockType(SparseBlock sblock)

estimateSizeSparseInMemory

public static long estimateSizeSparseInMemory(SparseBlock.Type type,
                                              long nrows,
                                              long ncols,
                                              double sparsity)

createIdentityMatrix

public static SparseBlock createIdentityMatrix(int nRowCol)

createIdentityMatrixWithEmptyRow

public static SparseBlock createIdentityMatrixWithEmptyRow(int nRowCol)

createFromArray

public static SparseBlock createFromArray(double[] valsDense,
                                          int nCol,
                                          int nnz)

Create a sparse block from an array. Note that the nnz count should be absolutely correct for this call to work.

Parameters:

valsDense - a double array of values linearized.

nCol - The number of columns in reach row.

nnz - The number of non zero values.

Returns:

A sparse block.