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 Summary

Constructors

Constructor and Description
RewriteCompressedReblock()

Method Summary

Modifier and Type	Method and Description
boolean	createsSplitDag() Indicates if the rewrite potentially splits dags, which is used for phase ordering of rewrites.
List<StatementBlock>	rewriteStatementBlock(StatementBlock sb, ProgramRewriteStatus sate) Handle an arbitrary statement block.
List<StatementBlock>	rewriteStatementBlocks(List<StatementBlock> sbs, ProgramRewriteStatus sate) Handle a list of statement blocks.
static boolean	satisfiesAggressiveCompressionCondition(Hop hop)
static boolean	satisfiesCompressionCondition(Hop hop)
static boolean	satisfiesSizeConstraintsForCompression(Hop hop)

Methods inherited from class org.apache.sysds.hops.rewrite.StatementBlockRewriteRule

createCutVarName

Methods inherited from class java.lang.Object

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

Constructor Detail

RewriteCompressedReblock

public RewriteCompressedReblock()

Method Detail

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)