Package org.apache.sysds.runtime.compress.colgroup

Class ColGroupRLE

    • Method Detail

      • getColGroupType

        public org.apache.sysds.runtime.compress.colgroup.AColGroup.ColGroupType getColGroupType()

      • getCounts

        public int[] getCounts​(int[] counts)

      • scalarOperation

        public AColGroup scalarOperation​(ScalarOperator op)
        Description copied from class: AColGroup
        Perform the specified scalar operation directly on the compressed column group, without decompressing individual cells if possible.
        Specified by:
        scalarOperation in class AColGroup
        Parameters:
        op - operation to perform
        Returns:
        version of this column group with the operation applied

      • unaryOperation

        public AColGroup unaryOperation​(UnaryOperator op)
        Description copied from class: AColGroup
        Perform unary operation on the column group and return a new column group
        Specified by:
        unaryOperation in class AColGroup
        Parameters:
        op - The operation to perform
        Returns:
        The new column group

      • binaryRowOpLeft

        public AColGroup binaryRowOpLeft​(BinaryOperator op,
                                 double[] v,
                                 boolean isRowSafe)
        Description copied from class: AColGroup
        Perform a binary row operation.
        Specified by:
        binaryRowOpLeft in class AColGroup
        Parameters:
        op - The operation to execute
        v - The vector of values to apply, should be same length as dictionary length.
        isRowSafe - True if the binary op is applied to an entire zero row and all results are zero
        Returns:
        A updated column group with the new values.

      • binaryRowOpRight

        public AColGroup binaryRowOpRight​(BinaryOperator op,
                                  double[] v,
                                  boolean isRowSafe)
        Description copied from class: AColGroup
        Perform a binary row operation.
        Specified by:
        binaryRowOpRight in class AColGroup
        Parameters:
        op - The operation to execute
        v - The vector of values to apply, should be same length as dictionary length.
        isRowSafe - True if the binary op is applied to an entire zero row and all results are zero
        Returns:
        A updated column group with the new values.

      • computeZeroIndicatorVector

        public boolean[] computeZeroIndicatorVector()

      • getIdx

        public double getIdx​(int r,
                     int colIdx)
        Description copied from class: AColGroup
        Get the value at a colGroup specific row/column index position.
        Specified by:
        getIdx in class AColGroup
        Parameters:
        r - row
        colIdx - column index in the _colIndexes.
        Returns:
        value at the row/column index position

      • leftMultByMatrixNoPreAgg

        public void leftMultByMatrixNoPreAgg​(MatrixBlock matrix,
                                     MatrixBlock result,
                                     int rl,
                                     int ru,
                                     int cl,
                                     int cu)
        Description copied from class: AColGroup
        Left multiply with this column group.
        Specified by:
        leftMultByMatrixNoPreAgg in class AColGroup
        Parameters:
        matrix - The matrix to multiply with on the left
        result - The result to output the values into, always dense for the purpose of the column groups parallelizing
        rl - The row to begin the multiplication from on the lhs matrix
        ru - The row to end the multiplication at on the lhs matrix
        cl - The column to begin the multiplication from on the lhs matrix
        cu - The column to end the multiplication at on the lhs matrix

      • containsValue

        public boolean containsValue​(double pattern)
        Description copied from class: AColGroup
        Detect if the column group contains a specific value.
        Specified by:
        containsValue in class AColGroup
        Parameters:
        pattern - The value to look for.
        Returns:
        boolean saying true if the value is contained.

      • preAggregateDense

        public void preAggregateDense​(MatrixBlock m,
                              double[] preAgg,
                              int rl,
                              int ru,
                              int cl,
                              int cu)
        Description copied from class: APreAgg
        Pre aggregate a dense matrix block into a pre aggregate target (first step of left matrix multiplication)
        Specified by:
        preAggregateDense in class APreAgg
        Parameters:
        m - The matrix to preAggregate
        preAgg - The preAggregate target
        rl - Row lower on the left side matrix
        ru - Row upper on the left side matrix
        cl - Column lower on the left side matrix (or row lower in the column group)
        cu - Column upper on the left side matrix (or row upper in the column group)

      • getCost

        public double getCost​(ComputationCostEstimator e,
                      int nRows)
        Description copied from class: AColGroup
        Get the computation cost associated with this column group.
        Specified by:
        getCost in class AColGroup
        Parameters:
        e - The computation cost estimator
        nRows - the number of rows in the column group
        Returns:
        The cost of this column group

      • sliceRows

        public AColGroup sliceRows​(int rl,
                           int ru)
        Description copied from class: AColGroup
        Slice range of rows out of the column group and return a new column group only containing the row segment. Note that this slice should maintain pointers back to the original dictionaries and only modify index structures.
        Specified by:
        sliceRows in class AColGroup
        Parameters:
        rl - The row to start at
        ru - The row to end at (not included)
        Returns:
        A new column group containing the specified row range.

      • append

        public AColGroup append​(AColGroup g)
        Description copied from class: AColGroup
        Append the other column group to this column group. This method tries to combine them to return a new column group containing both. In some cases it is possible in reasonable time, in others it is not. The result is first this column group followed by the other column group in higher row values. If it is not possible or very inefficient null is returned.
        Specified by:
        append in class AColGroup
        Parameters:
        g - The other column group
        Returns:
        A combined column group or null

      • getCompressionScheme

        public ICLAScheme getCompressionScheme()
        Description copied from class: AColGroup
        Get the compression scheme for this column group to enable compression of other data.
        Specified by:
        getCompressionScheme in class AColGroup
        Returns:
        The compression scheme of this column group

      • genRLEBitmap

        public static char[] genRLEBitmap​(int[] offsets,
                                  int len)
        Encodes the bitmap as a series of run lengths and offsets. Note that this method should not be called if the len is 0.
        Parameters:
        offsets - uncompressed offset list
        len - logical length of the given offset list
        Returns:
        compressed version of said bitmap