org.apache.sysds.runtime.controlprogram.parfor

## Class ResultMerge

- java.lang.Object
- - org.apache.sysds.runtime.controlprogram.parfor.ResultMerge

- All Implemented Interfaces:
    Serializable
  Direct Known Subclasses:
    ResultMergeLocalAutomatic, ResultMergeLocalFile, ResultMergeLocalMemory, ResultMergeRemoteSpark, ResultMergeRemoteSparkWCompare

      public abstract class ResultMerge
      extends Object
      implements Serializable

  Due to independence of all iterations, any result has the following properties: (1) non local var, (2) matrix object, and (3) completely independent. These properties allow us to realize result merging in parallel without any synchronization.
  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `ResultMerge(MatrixObject out, MatrixObject[] in, String outputFilename, boolean accum)`

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `abstract MatrixObject` | `executeParallelMerge(int par)` Merge all given input matrices in parallel into the given output matrix.
    `abstract MatrixObject` | `executeSerialMerge()` Merge all given input matrices sequentially into the given output matrix.

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

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

- - ### Constructor Detail

    - #### ResultMerge

          public ResultMerge(MatrixObject out,
                             MatrixObject[] in,
                             String outputFilename,
                             boolean accum)

  - ### Method Detail

    - #### executeSerialMerge

          public abstract MatrixObject executeSerialMerge()

      Merge all given input matrices sequentially into the given output matrix. The required space in-memory is the size of the output matrix plus the size of one input matrix at a time.
      Returns:
        output (merged) matrix

    - #### executeParallelMerge

          public abstract MatrixObject executeParallelMerge(int par)

      Merge all given input matrices in parallel into the given output matrix. The required space in-memory is the size of the output matrix plus the size of all input matrices.
      Parameters:
        `par` - degree of parallelism
      Returns:
        output (merged) matrix

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