org.apache.sysds.hops.estim

## Class EstimatorMatrixHistogram

- java.lang.Object
- - org.apache.sysds.hops.estim.SparsityEstimator
  - - org.apache.sysds.hops.estim.EstimatorMatrixHistogram

-     public class EstimatorMatrixHistogram
      extends SparsityEstimator

  This estimator implements a remarkably simple yet effective approach for incorporating structural properties into sparsity estimation. The key idea is to maintain row and column nnz per matrix, along with additional meta data.

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `EstimatorMatrixHistogram.MatrixHistogram`

    - ### Nested classes/interfaces inherited from class org.apache.sysds.hops.estim.SparsityEstimator

      `SparsityEstimator.OpCode`

  - ### Field Summary

    - ### Fields inherited from class org.apache.sysds.hops.estim.SparsityEstimator

      `MIN_PAR_THRESHOLD, MULTI_THREADED_BUILD, MULTI_THREADED_ESTIM`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `EstimatorMatrixHistogram()`
    `EstimatorMatrixHistogram(boolean useExtended)`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `double` | `estim(MatrixBlock m1, MatrixBlock m2)` Estimates the output sparsity for a single matrix multiplication.
    `double` | `estim(MatrixBlock m1, MatrixBlock m2, SparsityEstimator.OpCode op)` Estimates the output sparsity for a given binary operation.
    `double` | `estim(MatrixBlock m1, SparsityEstimator.OpCode op)` Estimates the output sparsity for a given unary operation.
    `DataCharacteristics` | `estim(MMNode root)` Estimates the output sparsity of a DAG of matrix multiplications for the given operator graph of a single root node.
    `DataCharacteristics` | `estim(MMNode root, boolean topLevel)`
    `double` | `estimIntern(EstimatorMatrixHistogram.MatrixHistogram h1, EstimatorMatrixHistogram.MatrixHistogram h2, SparsityEstimator.OpCode op, long[] misc)`

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### EstimatorMatrixHistogram

          public EstimatorMatrixHistogram()

    - #### EstimatorMatrixHistogram

          public EstimatorMatrixHistogram(boolean useExtended)

  - ### Method Detail

    - #### estim

          public DataCharacteristics estim(MMNode root)

      Description copied from class: `SparsityEstimator`
      Estimates the output sparsity of a DAG of matrix multiplications for the given operator graph of a single root node.
      Specified by:
        `estim` in class `SparsityEstimator`
      Parameters:
        `root` - DAG root node
      Returns:
        output data characteristics

    - #### estim

          public DataCharacteristics estim(MMNode root,
                                           boolean topLevel)

    - #### estim

          public double estim(MatrixBlock m1,
                              MatrixBlock m2)

      Description copied from class: `SparsityEstimator`
      Estimates the output sparsity for a single matrix multiplication.
      Specified by:
        `estim` in class `SparsityEstimator`
      Parameters:
        `m1` - left-hand-side operand
        `m2` - right-hand-side operand
      Returns:
        sparsity

    - #### estim

          public double estim(MatrixBlock m1,
                              MatrixBlock m2,
                              SparsityEstimator.OpCode op)

      Description copied from class: `SparsityEstimator`
      Estimates the output sparsity for a given binary operation.
      Specified by:
        `estim` in class `SparsityEstimator`
      Parameters:
        `m1` - left-hand-side operand
        `m2` - right-hand-side operand
        `op` - operator code
      Returns:
        sparsity

    - #### estim

          public double estim(MatrixBlock m1,
                              SparsityEstimator.OpCode op)

      Description copied from class: `SparsityEstimator`
      Estimates the output sparsity for a given unary operation.
      Specified by:
        `estim` in class `SparsityEstimator`
      Parameters:
        `m1` - left-hand-side operand
        `op` - operator code
      Returns:
        sparsity

    - #### estimIntern

          public double estimIntern(EstimatorMatrixHistogram.MatrixHistogram h1,
                                    EstimatorMatrixHistogram.MatrixHistogram h2,
                                    SparsityEstimator.OpCode op,
                                    long[] misc)

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