org.apache.sysds.hops.rewrite

## Class HopRewriteRule

- java.lang.Object
- - org.apache.sysds.hops.rewrite.HopRewriteRule

- Direct Known Subclasses:
    RewriteAlgebraicSimplificationDynamic, RewriteAlgebraicSimplificationStatic, RewriteBlockSizeAndReblock, RewriteCommonSubexpressionElimination, RewriteConstantFolding, RewriteElementwiseMultChainOptimization, RewriteGPUSpecificOps, RewriteIndexingVectorization, RewriteInjectSparkPReadCheckpointing, RewriteMatrixMultChainOptimization, RewriteRemoveDanglingParentReferences, RewriteRemovePersistentReadWrite, RewriteRemoveReadAfterWrite, RewriteRemoveUnnecessaryCasts, RewriteTransientWriteParentHandling

      public abstract class HopRewriteRule
      extends Object

  Base class for all hop rewrites in order to enable generic application of all rules.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `HopRewriteRule()`

  - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `abstract Hop` | `rewriteHopDAG(Hop root, ProgramRewriteStatus state)` Handle a predicate hop DAG with exactly one root.
    `abstract ArrayList<Hop>` | `rewriteHopDAGs(ArrayList<Hop> roots, ProgramRewriteStatus state)` Handle a generic (last-level) hop DAG with multiple roots.

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

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

- - ### Constructor Detail

    - #### HopRewriteRule

          public HopRewriteRule()

  - ### Method Detail

    - #### rewriteHopDAGs

          public abstract ArrayList<Hop> rewriteHopDAGs(ArrayList<Hop> roots,
                                                        ProgramRewriteStatus state)

      Handle a generic (last-level) hop DAG with multiple roots.
      Parameters:
        `roots` - high-level operator roots
        `state` - program rewrite status
      Returns:
        list of high-level operators

    - #### rewriteHopDAG

          public abstract Hop rewriteHopDAG(Hop root,
                                            ProgramRewriteStatus state)

      Handle a predicate hop DAG with exactly one root.
      Parameters:
        `root` - high-level operator root
        `state` - program rewrite status
      Returns:
        high-level operator

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