Package org.apache.sysds.runtime.compress.cost

Class HybridCostEstimator

java.lang.Object

org.apache.sysds.runtime.compress.cost.ACostEstimate

org.apache.sysds.runtime.compress.cost.HybridCostEstimator

All Implemented Interfaces:

Serializable

public class HybridCostEstimator
extends ACostEstimate

See Also:

• Serialized Form

Method Summary

Modifier and Type	Method	Description
double	getCost(AColGroup cg, int nRows)	Get the cost of a compressed columnGroup.
double	getCost(MatrixBlock mb)	Get the cost of a matrix block.
boolean	shouldSparsify()	Ask the cost estimator if it is a good idea to try to sparsify a column group.

Methods inherited from class org.apache.sysds.runtime.compress.cost.ACostEstimate

getCost, getCost, getCost, getCost, toString

Methods inherited from class java.lang.Object

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

Method Details

getCost

public double getCost(MatrixBlock mb)

Description copied from class: ACostEstimate

Get the cost of a matrix block.

Specified by:

getCost in class ACostEstimate

Parameters:

mb - A MatrixBlock

Returns:

The cost subject to the internal cost functions

getCost

public double getCost(AColGroup cg,
 int nRows)

Description copied from class: ACostEstimate

Get the cost of a compressed columnGroup.

Specified by:

getCost in class ACostEstimate

Parameters:

cg - A ColumnGroup

nRows - The number of rows in the column group

Returns:

The cost subject to the internal cost functions

shouldSparsify

public boolean shouldSparsify()

Description copied from class: ACostEstimate

Ask the cost estimator if it is a good idea to try to sparsify a column group. It is the same as asking if it is a good idea to make FOR on top of the column group.

Specified by:

shouldSparsify in class ACostEstimate

Returns:

true if yes