Package org.apache.sysds.hops.estim

Class EstimatorMatrixHistogram

java.lang.Object

org.apache.sysds.hops.estim.SparsityEstimator

org.apache.sysds.hops.estim.EstimatorMatrixHistogram

public class EstimatorMatrixHistogram
extends SparsityEstimator

This estimator implements a remarkably simple yet effective approach for incorporating structural properties into sparsity estimation. The key idea is to maintain row and column nnz per matrix, along with additional meta data.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	EstimatorMatrixHistogram.MatrixHistogram

Nested classes/interfaces inherited from class org.apache.sysds.hops.estim.SparsityEstimator

SparsityEstimator.OpCode

Field Summary

Fields inherited from class org.apache.sysds.hops.estim.SparsityEstimator

MIN_PAR_THRESHOLD, MULTI_THREADED_BUILD, MULTI_THREADED_ESTIM

Constructor Summary

Constructors

Constructor	Description
EstimatorMatrixHistogram()
EstimatorMatrixHistogram(boolean useExtended)

Method Summary

Modifier and Type	Method	Description
DataCharacteristics	estim(MMNode root)	Estimates the output sparsity of a DAG of matrix multiplications for the given operator graph of a single root node.
DataCharacteristics	estim(MMNode root, boolean topLevel)
double	estim(MatrixBlock m1, SparsityEstimator.OpCode op)	Estimates the output sparsity for a given unary operation.
double	estim(MatrixBlock m1, MatrixBlock m2)	Estimates the output sparsity for a single matrix multiplication.
double	estim(MatrixBlock m1, MatrixBlock m2, SparsityEstimator.OpCode op)	Estimates the output sparsity for a given binary operation.
double	estimIntern(EstimatorMatrixHistogram.MatrixHistogram h1, EstimatorMatrixHistogram.MatrixHistogram h2, SparsityEstimator.OpCode op, long[] misc)

Methods inherited from class java.lang.Object

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

Constructor Details

EstimatorMatrixHistogram

public EstimatorMatrixHistogram()

EstimatorMatrixHistogram

public EstimatorMatrixHistogram(boolean useExtended)

Method Details

estim

public DataCharacteristics estim(MMNode root)

Description copied from class: SparsityEstimator

Estimates the output sparsity of a DAG of matrix multiplications for the given operator graph of a single root node.

Specified by:

estim in class SparsityEstimator

Parameters:

root - DAG root node

Returns:

output data characteristics

estim

public DataCharacteristics estim(MMNode root,
 boolean topLevel)

estim

public double estim(MatrixBlock m1,
 MatrixBlock m2)

Description copied from class: SparsityEstimator

Estimates the output sparsity for a single matrix multiplication.

Specified by:

estim in class SparsityEstimator

Parameters:

m1 - left-hand-side operand

m2 - right-hand-side operand

Returns:

sparsity

estim

public double estim(MatrixBlock m1,
 MatrixBlock m2,
 SparsityEstimator.OpCode op)

Description copied from class: SparsityEstimator

Estimates the output sparsity for a given binary operation.

Specified by:

estim in class SparsityEstimator

Parameters:

m1 - left-hand-side operand

m2 - right-hand-side operand

op - operator code

Returns:

sparsity

estim

public double estim(MatrixBlock m1,
 SparsityEstimator.OpCode op)

Description copied from class: SparsityEstimator

Estimates the output sparsity for a given unary operation.

Specified by:

estim in class SparsityEstimator

Parameters:

m1 - left-hand-side operand

op - operator code

Returns:

sparsity

estimIntern

public double estimIntern(EstimatorMatrixHistogram.MatrixHistogram h1,
 EstimatorMatrixHistogram.MatrixHistogram h2,
 SparsityEstimator.OpCode op,
 long[] misc)