Package org.apache.sysds.hops.rewrite

Class RewriteCompressedReblock

java.lang.Object
org.apache.sysds.hops.rewrite.StatementBlockRewriteRule
org.apache.sysds.hops.rewrite.RewriteCompressedReblock
public class RewriteCompressedReblock extends StatementBlockRewriteRule
Rule: Compressed Re block if config compressed.linalg is enabled, we inject compression directions after read of matrices if number of rows is above 1000 and cols at least 1. In case of 'auto' compression, we apply compression if the data size is known to exceed aggregate cluster memory, the matrix is used in loops, and all operations are supported over compressed matrices.

  • Constructor Details

    • RewriteCompressedReblock

      public RewriteCompressedReblock()

  • Method Details

    • createsSplitDag

      public boolean createsSplitDag()
      Description copied from class: StatementBlockRewriteRule
      Indicates if the rewrite potentially splits dags, which is used for phase ordering of rewrites.
      Specified by:
      createsSplitDag in class StatementBlockRewriteRule
      Returns:
      true if dag splits are possible.

    • rewriteStatementBlock

      public List<StatementBlock> rewriteStatementBlock(StatementBlock sb, ProgramRewriteStatus sate)
      Description copied from class: StatementBlockRewriteRule
      Handle an arbitrary statement block. Specific type constraints have to be ensured within the individual rewrites. If a rewrite does not apply to individual blocks, it should simply return the input block.
      Specified by:
      rewriteStatementBlock in class StatementBlockRewriteRule
      Parameters:
      sb - statement block
      sate - program rewrite status
      Returns:
      list of statement blocks

    • rewriteStatementBlocks

      public List<StatementBlock> rewriteStatementBlocks(List<StatementBlock> sbs, ProgramRewriteStatus sate)
      Description copied from class: StatementBlockRewriteRule
      Handle a list of statement blocks. Specific type constraints have to be ensured within the individual rewrites. If a rewrite does not require sequence access, it should simply return the input list of statement blocks.
      Specified by:
      rewriteStatementBlocks in class StatementBlockRewriteRule
      Parameters:
      sbs - list of statement blocks
      sate - program rewrite status
      Returns:
      list of statement blocks

    • satisfiesSizeConstraintsForCompression

      public static boolean satisfiesSizeConstraintsForCompression(Hop hop)

    • satisfiesCompressionCondition

      public static boolean satisfiesCompressionCondition(Hop hop)

    • satisfiesAggressiveCompressionCondition

      public static boolean satisfiesAggressiveCompressionCondition(Hop hop)