Class MemoryCostEstimator

    • Constructor Detail

      • MemoryCostEstimator

        public MemoryCostEstimator()
    • Method Detail

      • 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