Package org.apache.sysds.runtime.data

Class SparseRowScalar

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      boolean add​(int col, double v)
      Add a value to a specified column with awareness of potential insertions.
      void append​(int col, double v)
      Appends a value to the end of the sparse row.
      void compact()
      In-place compaction of non-zero-entries; removes zero entries and shifts non-zero entries to the left if necessary.
      void compact​(double eps)
      In-place compaction of values over eps away from zero; and shifts non-zero entries to the left if necessary.
      double get​(int col)
      Gets the value of a specified column.
      int getIndex()  
      double getValue()  
      int[] indexes()
      Get the index array of non-zero entries, co-aligned with the array of values.
      boolean isEmpty()
      Indicates if the sparse row is empty, i.e., if is has size zero.
      void reset​(int estnns, int maxnns)
      Resets the sparse row to empty, after this call size and isEmpty are guaranteed to return 0 and true, respectively.
      boolean set​(int col, double v)
      Sets the value of a specified column with awareness of potential overwrites or deletes (set to value zero).
      int size()
      Get the number of non-zero values of the sparse row.
      void sort()
      In-place sort of column-index value pairs in order to allow binary search after constant-time append was used for reading unordered sparse rows.
      double[] values()
      Get the value array of non-zero entries, co-aligned with the array of indexes.

    • Constructor Detail

      • SparseRowScalar

        public SparseRowScalar()

      • SparseRowScalar

        public SparseRowScalar​(int ix,
                       double val)

    • Method Detail

      • size

        public int size()
        Description copied from class: SparseRow
        Get the number of non-zero values of the sparse row.
        Specified by:
        size in class SparseRow
        Returns:
        number of non-zeros

      • isEmpty

        public boolean isEmpty()
        Description copied from class: SparseRow
        Indicates if the sparse row is empty, i.e., if is has size zero.
        Specified by:
        isEmpty in class SparseRow
        Returns:
        true if empty

      • values

        public double[] values()
        Description copied from class: SparseRow
        Get the value array of non-zero entries, co-aligned with the array of indexes.
        Specified by:
        values in class SparseRow
        Returns:
        array of values

      • indexes

        public int[] indexes()
        Description copied from class: SparseRow
        Get the index array of non-zero entries, co-aligned with the array of values.
        Specified by:
        indexes in class SparseRow
        Returns:
        array of indexes

      • reset

        public void reset​(int estnns,
                  int maxnns)
        Description copied from class: SparseRow
        Resets the sparse row to empty, after this call size and isEmpty are guaranteed to return 0 and true, respectively.
        Specified by:
        reset in class SparseRow
        Parameters:
        estnns - estimated number of non-zeros
        maxnns - maximum number of non-zeros, e.g., number of columns

      • set

        public boolean set​(int col,
                   double v)
        Description copied from class: SparseRow
        Sets the value of a specified column with awareness of potential overwrites or deletes (set to value zero).
        Specified by:
        set in class SparseRow
        Parameters:
        col - column index, zero-based
        v - value
        Returns:
        true if the size of the sparse row changed

      • add

        public boolean add​(int col,
                   double v)
        Description copied from class: SparseRow
        Add a value to a specified column with awareness of potential insertions.
        Specified by:
        add in class SparseRow
        Parameters:
        col - column index, zero-based
        v - value
        Returns:
        true if the size of the sparse row changed

      • append

        public void append​(int col,
                   double v)
        Description copied from class: SparseRow
        Appends a value to the end of the sparse row.
        Specified by:
        append in class SparseRow
        Parameters:
        col - column index, zero-based
        v - value

      • get

        public double get​(int col)
        Description copied from class: SparseRow
        Gets the value of a specified column. If the column index does not exist in the sparse row, this call returns zero.
        Specified by:
        get in class SparseRow
        Parameters:
        col - column index, zero-based
        Returns:
        value

      • sort

        public void sort()
        Description copied from class: SparseRow
        In-place sort of column-index value pairs in order to allow binary search after constant-time append was used for reading unordered sparse rows. We first check if already sorted and subsequently sort if necessary in order to get O(n) best case. Note: In-place sort is necessary in order to guarantee the memory estimate for operations that implicitly read that data set.
        Specified by:
        sort in class SparseRow

      • compact

        public void compact()
        Description copied from class: SparseRow
        In-place compaction of non-zero-entries; removes zero entries and shifts non-zero entries to the left if necessary.
        Specified by:
        compact in class SparseRow

      • compact

        public void compact​(double eps)
        Description copied from class: SparseRow
        In-place compaction of values over eps away from zero; and shifts non-zero entries to the left if necessary.
        Specified by:
        compact in class SparseRow
        Parameters:
        eps - epsilon value

      • getIndex

        public int getIndex()

      • getValue

        public double getValue()