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| <div class="subTitle">org.apache.sysds.hops.rewrite</div> |
| <h2 title="Class RewriteElementwiseMultChainOptimization" class="title">Class RewriteElementwiseMultChainOptimization</h2> |
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| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
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| <li><a href="../../../../../org/apache/sysds/hops/rewrite/HopRewriteRule.html" title="class in org.apache.sysds.hops.rewrite">org.apache.sysds.hops.rewrite.HopRewriteRule</a></li> |
| <li> |
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| <li>org.apache.sysds.hops.rewrite.RewriteElementwiseMultChainOptimization</li> |
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| <pre>public class <span class="typeNameLabel">RewriteElementwiseMultChainOptimization</span> |
| extends <a href="../../../../../org/apache/sysds/hops/rewrite/HopRewriteRule.html" title="class in org.apache.sysds.hops.rewrite">HopRewriteRule</a></pre> |
| <div class="block">Prerequisite: RewriteCommonSubexpressionElimination must run before this rule. |
| |
| Rewrite a chain of element-wise multiply hops that contain identical elements. |
| For example `(B * A) * B` is rewritten to `A * (B^2)` (or `(B^2) * A`), where `^` is element-wise power. |
| The order of the multiplicands depends on their data types, dimensions (matrix or vector), and sparsity. |
| |
| Does not rewrite in the presence of foreign parents in the middle of the e-wise multiply chain, |
| since foreign parents may rely on the individual results. |
| Does not perform rewrites on an element-wise multiply if its dimensions are unknown. |
| |
| The new order of element-wise multiply chains is as follows: |
| <pre> |
| (((unknown * object * frame) * ([least-nnz-matrix * matrix] * most-nnz-matrix)) |
| * ([least-nnz-row-vector * row-vector] * most-nnz-row-vector)) |
| * ([[scalars * least-nnz-col-vector] * col-vector] * most-nnz-col-vector) |
| </pre> |
| Identical elements are replaced with powers.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/rewrite/RewriteElementwiseMultChainOptimization.html#RewriteElementwiseMultChainOptimization--">RewriteElementwiseMultChainOptimization</a></span>()</code> </td> |
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| <td class="colFirst"><code><a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/rewrite/RewriteElementwiseMultChainOptimization.html#rewriteHopDAG-org.apache.sysds.hops.Hop-org.apache.sysds.hops.rewrite.ProgramRewriteStatus-">rewriteHopDAG</a></span>(<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a> root, |
| <a href="../../../../../org/apache/sysds/hops/rewrite/ProgramRewriteStatus.html" title="class in org.apache.sysds.hops.rewrite">ProgramRewriteStatus</a> state)</code> |
| <div class="block">Handle a predicate hop DAG with exactly one root.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/ArrayList.html?is-external=true" title="class or interface in java.util">ArrayList</a><<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/rewrite/RewriteElementwiseMultChainOptimization.html#rewriteHopDAGs-java.util.ArrayList-org.apache.sysds.hops.rewrite.ProgramRewriteStatus-">rewriteHopDAGs</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/ArrayList.html?is-external=true" title="class or interface in java.util">ArrayList</a><<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>> roots, |
| <a href="../../../../../org/apache/sysds/hops/rewrite/ProgramRewriteStatus.html" title="class in org.apache.sysds.hops.rewrite">ProgramRewriteStatus</a> state)</code> |
| <div class="block">Handle a generic (last-level) hop DAG with multiple roots.</div> |
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| <h4>RewriteElementwiseMultChainOptimization</h4> |
| <pre>public RewriteElementwiseMultChainOptimization()</pre> |
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| <h4>rewriteHopDAGs</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/util/ArrayList.html?is-external=true" title="class or interface in java.util">ArrayList</a><<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>> rewriteHopDAGs(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/ArrayList.html?is-external=true" title="class or interface in java.util">ArrayList</a><<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>> roots, |
| <a href="../../../../../org/apache/sysds/hops/rewrite/ProgramRewriteStatus.html" title="class in org.apache.sysds.hops.rewrite">ProgramRewriteStatus</a> state)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../org/apache/sysds/hops/rewrite/HopRewriteRule.html#rewriteHopDAGs-java.util.ArrayList-org.apache.sysds.hops.rewrite.ProgramRewriteStatus-">HopRewriteRule</a></code></span></div> |
| <div class="block">Handle a generic (last-level) hop DAG with multiple roots.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/sysds/hops/rewrite/HopRewriteRule.html#rewriteHopDAGs-java.util.ArrayList-org.apache.sysds.hops.rewrite.ProgramRewriteStatus-">rewriteHopDAGs</a></code> in class <code><a href="../../../../../org/apache/sysds/hops/rewrite/HopRewriteRule.html" title="class in org.apache.sysds.hops.rewrite">HopRewriteRule</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>roots</code> - high-level operator roots</dd> |
| <dd><code>state</code> - program rewrite status</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>list of high-level operators</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="rewriteHopDAG-org.apache.sysds.hops.Hop-org.apache.sysds.hops.rewrite.ProgramRewriteStatus-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>rewriteHopDAG</h4> |
| <pre>public <a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a> rewriteHopDAG(<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a> root, |
| <a href="../../../../../org/apache/sysds/hops/rewrite/ProgramRewriteStatus.html" title="class in org.apache.sysds.hops.rewrite">ProgramRewriteStatus</a> state)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../org/apache/sysds/hops/rewrite/HopRewriteRule.html#rewriteHopDAG-org.apache.sysds.hops.Hop-org.apache.sysds.hops.rewrite.ProgramRewriteStatus-">HopRewriteRule</a></code></span></div> |
| <div class="block">Handle a predicate hop DAG with exactly one root.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/sysds/hops/rewrite/HopRewriteRule.html#rewriteHopDAG-org.apache.sysds.hops.Hop-org.apache.sysds.hops.rewrite.ProgramRewriteStatus-">rewriteHopDAG</a></code> in class <code><a href="../../../../../org/apache/sysds/hops/rewrite/HopRewriteRule.html" title="class in org.apache.sysds.hops.rewrite">HopRewriteRule</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>root</code> - high-level operator root</dd> |
| <dd><code>state</code> - program rewrite status</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>high-level operator</dd> |
| </dl> |
| </li> |
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