Class ComputationCostEstimator
- java.lang.Object
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- org.apache.sysds.runtime.compress.cost.ACostEstimate
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- org.apache.sysds.runtime.compress.cost.ComputationCostEstimator
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- All Implemented Interfaces:
Serializable
public class ComputationCostEstimator extends ACostEstimate
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description ComputationCostEstimator(int scans, int decompressions, int overlappingDecompressions, int leftMultiplications, int rightMultiplications, int compressedMultiplication, int dictOps, boolean isDensifying)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description doublegetCost(int nRows, int nRowsScanned, int nCols, int nVals, double sparsity)Get the cost of a column group.doublegetCost(AColGroup cg, int nRows)Get the cost of a compressed columnGroup.doublegetCost(MatrixBlock mb)Get the cost of a matrix block.booleanisDense()booleanshouldSparsify()Ask the cost estimator if it is a good idea to try to sparsify a column group.StringtoString()-
Methods inherited from class org.apache.sysds.runtime.compress.cost.ACostEstimate
getCost, getCost, getCost, getCost
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Method Detail
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getCost
public double getCost(int nRows, int nRowsScanned, int nCols, int nVals, double sparsity)Get the cost of a column group.- Parameters:
nRows- The total number of rowsnRowsScanned- Number of rows to process in this specific groupnCols- Number of columns in the column groupnVals- Number of unique tuples contained in the groupsparsity- The sparsity of the unique tuples stored- Returns:
- A cost
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isDense
public boolean isDense()
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getCost
public double getCost(MatrixBlock mb)
Description copied from class:ACostEstimateGet the cost of a matrix block.- Specified by:
getCostin classACostEstimate- Parameters:
mb- A MatrixBlock- Returns:
- The cost subject to the internal cost functions
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getCost
public double getCost(AColGroup cg, int nRows)
Description copied from class:ACostEstimateGet the cost of a compressed columnGroup.- Specified by:
getCostin classACostEstimate- Parameters:
cg- A ColumnGroupnRows- The number of rows in the column group- Returns:
- The cost subject to the internal cost functions
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shouldSparsify
public boolean shouldSparsify()
Description copied from class:ACostEstimateAsk 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:
shouldSparsifyin classACostEstimate- Returns:
- true if yes
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toString
public String toString()
- Overrides:
toStringin classACostEstimate
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