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 <pre>public class <span class="typeNameLabel">Recompiler</span>
 extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre>
 <div class="block">Dynamic recompilation of hop dags to runtime instructions, which includes the
  following substeps:

  (1) deep copy hop dag, (2) refresh matrix characteristics, (3) apply
  dynamic rewrites, (4) refresh memory estimates, (5) construct lops (incl
  operator selection), and (6) generate runtime program (incl piggybacking).</div>
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 <td class="colFirst"><code>static class&nbsp;</code></td>
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 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/recompile/Recompiler.html#checkCPCheckpoint-org.apache.sysds.runtime.meta.DataCharacteristics-">checkCPCheckpoint</a></span>(<a href="../../../../../org/apache/sysds/runtime/meta/DataCharacteristics.html" title="class in org.apache.sysds.runtime.meta">DataCharacteristics</a>&nbsp;dc)</code>&nbsp;</td>
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 <div class="block">CP Reblock check for spark instructions; in contrast to MR, we can not
  rely on the input file sizes because inputs might be passed via rdds.</div>
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 <tr id="i2" class="altColor">
 <td class="colFirst"><code>static <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/recompile/Recompiler.html#deepCopyHopsDag-org.apache.sysds.hops.Hop-">deepCopyHopsDag</a></span>(<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>&nbsp;hops)</code>
 <div class="block">Deep copy of hops dags for parallel recompilation.</div>
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 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/recompile/Recompiler.html#deepCopyHopsDag-java.util.List-">deepCopyHopsDag</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>&gt;&nbsp;hops)</code>
 <div class="block">Deep copy of hops dags for parallel recompilation.</div>
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 <td class="colFirst"><code>static void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/recompile/Recompiler.html#executeInMemoryReblock-org.apache.sysds.runtime.controlprogram.context.ExecutionContext-java.lang.String-java.lang.String-">executeInMemoryReblock</a></span>(<a href="../../../../../org/apache/sysds/runtime/controlprogram/context/ExecutionContext.html" title="class in org.apache.sysds.runtime.controlprogram.context">ExecutionContext</a>&nbsp;ec,
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                       <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;varout)</code>&nbsp;</td>
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 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>static void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/recompile/Recompiler.html#extractDAGOutputStatistics-java.util.ArrayList-org.apache.sysds.runtime.controlprogram.LocalVariableMap-">extractDAGOutputStatistics</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>&lt;<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>&gt;&nbsp;hops,
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 <td class="colFirst"><code>static void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/recompile/Recompiler.html#extractDAGOutputStatistics-java.util.ArrayList-org.apache.sysds.runtime.controlprogram.LocalVariableMap-boolean-">extractDAGOutputStatistics</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>&lt;<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>&gt;&nbsp;hops,
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                           boolean&nbsp;overwrite)</code>&nbsp;</td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code>static void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/recompile/Recompiler.html#extractDAGOutputStatistics-org.apache.sysds.hops.Hop-org.apache.sysds.runtime.controlprogram.LocalVariableMap-boolean-">extractDAGOutputStatistics</a></span>(<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>&nbsp;hop,
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                           boolean&nbsp;overwrite)</code>&nbsp;</td>
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 <tr id="i8" class="altColor">
 <td class="colFirst"><code>static void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/recompile/Recompiler.html#rClearLops-org.apache.sysds.hops.Hop-">rClearLops</a></span>(<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>&nbsp;hop)</code>
 <div class="block">Clearing lops for a given hops includes to (1) remove the reference
  to constructed lops and (2) clear the exec type (for consistency).</div>
 </td>
 </tr>
 <tr id="i9" class="rowColor">
 <td class="colFirst"><code>static <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>&lt;<a href="../../../../../org/apache/sysds/runtime/instructions/Instruction.html" title="class in org.apache.sysds.runtime.instructions">Instruction</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/recompile/Recompiler.html#recompileHopsDag-org.apache.sysds.hops.Hop-org.apache.sysds.runtime.controlprogram.LocalVariableMap-org.apache.sysds.hops.recompile.RecompileStatus-boolean-boolean-long-">recompileHopsDag</a></span>(<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>&nbsp;hop,
                 <a href="../../../../../org/apache/sysds/runtime/controlprogram/LocalVariableMap.html" title="class in org.apache.sysds.runtime.controlprogram">LocalVariableMap</a>&nbsp;vars,
                 <a href="../../../../../org/apache/sysds/hops/recompile/RecompileStatus.html" title="class in org.apache.sysds.hops.recompile">RecompileStatus</a>&nbsp;status,
                 boolean&nbsp;inplace,
                 boolean&nbsp;replaceLit,
                 long&nbsp;tid)</code>&nbsp;</td>
 </tr>
 <tr id="i10" class="altColor">
 <td class="colFirst"><code>static <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>&lt;<a href="../../../../../org/apache/sysds/runtime/instructions/Instruction.html" title="class in org.apache.sysds.runtime.instructions">Instruction</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/recompile/Recompiler.html#recompileHopsDag-org.apache.sysds.parser.StatementBlock-java.util.ArrayList-org.apache.sysds.runtime.controlprogram.context.ExecutionContext-org.apache.sysds.hops.recompile.RecompileStatus-boolean-boolean-long-">recompileHopsDag</a></span>(<a href="../../../../../org/apache/sysds/parser/StatementBlock.html" title="class in org.apache.sysds.parser">StatementBlock</a>&nbsp;sb,
                 <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>&lt;<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>&gt;&nbsp;hops,
                 <a href="../../../../../org/apache/sysds/runtime/controlprogram/context/ExecutionContext.html" title="class in org.apache.sysds.runtime.controlprogram.context">ExecutionContext</a>&nbsp;ec,
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                 boolean&nbsp;inplace,
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 <tr id="i11" class="rowColor">
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 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/recompile/Recompiler.html#recompileHopsDag-org.apache.sysds.parser.StatementBlock-java.util.ArrayList-org.apache.sysds.runtime.controlprogram.LocalVariableMap-org.apache.sysds.hops.recompile.RecompileStatus-boolean-boolean-long-">recompileHopsDag</a></span>(<a href="../../../../../org/apache/sysds/parser/StatementBlock.html" title="class in org.apache.sysds.parser">StatementBlock</a>&nbsp;sb,
                 <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>&lt;<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>&gt;&nbsp;hops,
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                 boolean&nbsp;replaceLit,
                 long&nbsp;tid)</code>&nbsp;</td>
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 <tr id="i12" class="altColor">
 <td class="colFirst"><code>static <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>&lt;<a href="../../../../../org/apache/sysds/runtime/instructions/Instruction.html" title="class in org.apache.sysds.runtime.instructions">Instruction</a>&gt;</code></td>
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                        <a href="../../../../../org/apache/sysds/lops/LopProperties.ExecType.html" title="enum in org.apache.sysds.lops">LopProperties.ExecType</a>&nbsp;et)</code>&nbsp;</td>
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                        long&nbsp;tid,
                        <a href="../../../../../org/apache/sysds/lops/LopProperties.ExecType.html" title="enum in org.apache.sysds.lops">LopProperties.ExecType</a>&nbsp;et)</code>&nbsp;</td>
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 <tr id="i14" class="altColor">
 <td class="colFirst"><code>static <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>&lt;<a href="../../../../../org/apache/sysds/runtime/instructions/Instruction.html" title="class in org.apache.sysds.runtime.instructions">Instruction</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/recompile/Recompiler.html#recompileHopsDagInstructions-org.apache.sysds.hops.Hop-">recompileHopsDagInstructions</a></span>(<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>&nbsp;hop)</code>&nbsp;</td>
 </tr>
 <tr id="i15" class="rowColor">
 <td class="colFirst"><code>static <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>&lt;<a href="../../../../../org/apache/sysds/runtime/instructions/Instruction.html" title="class in org.apache.sysds.runtime.instructions">Instruction</a>&gt;</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/recompile/Recompiler.html#recompileHopsDagInstructions-org.apache.sysds.parser.StatementBlock-java.util.ArrayList-">recompileHopsDagInstructions</a></span>(<a href="../../../../../org/apache/sysds/parser/StatementBlock.html" title="class in org.apache.sysds.parser">StatementBlock</a>&nbsp;sb,
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 <tr id="i16" class="altColor">
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 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/sysds/hops/recompile/Recompiler.html#recompileProgramBlockHierarchy-java.util.ArrayList-org.apache.sysds.runtime.controlprogram.LocalVariableMap-long-boolean-org.apache.sysds.hops.recompile.Recompiler.ResetType-">recompileProgramBlockHierarchy</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>&lt;<a href="../../../../../org/apache/sysds/runtime/controlprogram/ProgramBlock.html" title="class in org.apache.sysds.runtime.controlprogram">ProgramBlock</a>&gt;&nbsp;pbs,
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                               boolean&nbsp;inplace,
                               <a href="../../../../../org/apache/sysds/hops/recompile/Recompiler.ResetType.html" title="enum in org.apache.sysds.hops.recompile">Recompiler.ResetType</a>&nbsp;resetRecompile)</code>&nbsp;</td>
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 <tr id="i17" class="rowColor">
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 <td class="colFirst"><code>static void</code></td>
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                                                   boolean&nbsp;inplace,
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 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>pbs</code> - list of program blocks</dd>
 <dd><code>tid</code> - thread id</dd>
 <dd><code>fnStack</code> - function stack</dd>
 <dd><code>et</code> - execution type</dd>
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 <div class="block">This method does NO full program block recompile (no stats update, no rewrites, no recursion) but
  only regenerates lops and instructions. The primary use case is recompilation after are hop configuration
  changes which allows to preserve statistics (e.g., propagated worst case stats from other program blocks)
  and better performance for recompiling individual program blocks.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>pb</code> - program block</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if IOException occurs</dd>
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 <div class="block">Deep copy of hops dags for parallel recompilation.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>hops</code> - list of high-level operators</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>list of high-level operators</dd>
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 <div class="block">Deep copy of hops dags for parallel recompilation.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>hops</code> - high-level operator</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
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                                                  long&nbsp;tid,
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                                         <a href="../../../../../org/apache/sysds/parser/StatementBlock.html" title="class in org.apache.sysds.parser">StatementBlock</a>&nbsp;sb)</pre>
 <div class="block">Remove any scalar variables from the variable map if the variable
  is updated in this block.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>callVars</code> - Map of variables eligible for propagation.</dd>
 <dd><code>sb</code> - DML statement block.</dd>
 </dl>
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 <pre>public static&nbsp;void&nbsp;extractDAGOutputStatistics(<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>&lt;<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>&gt;&nbsp;hops,
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 <pre>public static&nbsp;void&nbsp;extractDAGOutputStatistics(<a href="../../../../../org/apache/sysds/hops/Hop.html" title="class in org.apache.sysds.hops">Hop</a>&nbsp;hop,
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 <div class="block">Clearing lops for a given hops includes to (1) remove the reference
  to constructed lops and (2) clear the exec type (for consistency).

  The latter is important for advanced optimizers like parfor; otherwise subtle
  side-effects of program recompilation and hop-lop rewrites possible
  (e.g., see indexingop hop-lop rewrite in combination parfor rewrite set
  exec type that eventuelly might lead to unnecessary remote_parfor jobs).</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>hop</code> - high-level operator</dd>
 </dl>
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                                     <a href="../../../../../org/apache/sysds/runtime/controlprogram/context/ExecutionContext.html" title="class in org.apache.sysds.runtime.controlprogram.context">ExecutionContext</a>&nbsp;ec,
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 <div class="block">public interface to package local literal replacement</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>hop</code> - high-level operator</dd>
 <dd><code>ec</code> - Execution context</dd>
 <dd><code>scalarsOnly</code> - if true, replace only scalar variables but no matrix operations;
             if false, apply full literal replacement</dd>
 </dl>
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 <pre>public static&nbsp;boolean&nbsp;checkCPReblock(<a href="../../../../../org/apache/sysds/runtime/controlprogram/context/ExecutionContext.html" title="class in org.apache.sysds.runtime.controlprogram.context">ExecutionContext</a>&nbsp;ec,
                                      <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;varin)</pre>
 <div class="block">CP Reblock check for spark instructions; in contrast to MR, we can not
  rely on the input file sizes because inputs might be passed via rdds.</div>
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 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>ec</code> - execution context</dd>
 <dd><code>varin</code> - variable</dd>
 <dt><span class="returnLabel">Returns:</span></dt>
 <dd>true if CP reblock?</dd>
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 <pre>public static&nbsp;boolean&nbsp;checkCPCheckpoint(<a href="../../../../../org/apache/sysds/runtime/meta/DataCharacteristics.html" title="class in org.apache.sysds.runtime.meta">DataCharacteristics</a>&nbsp;dc)</pre>
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 <pre>public static&nbsp;void&nbsp;executeInMemoryReblock(<a href="../../../../../org/apache/sysds/runtime/controlprogram/context/ExecutionContext.html" title="class in org.apache.sysds.runtime.controlprogram.context">ExecutionContext</a>&nbsp;ec,
                                           <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;varin,
                                           <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;varout)</pre>
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