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+<!DOCTYPE html >
+<html>
+        <head>
+          <title>MetricEvaluator - PredictionIO Scala API 0.12.0-incubating - 
org.apache.predictionio.controller.MetricEvaluator</title>
+          <meta name="description" content="MetricEvaluator - PredictionIO 
Scala API 0.12.0 - incubating - 
org.apache.predictionio.controller.MetricEvaluator" />
+          <meta name="keywords" content="MetricEvaluator PredictionIO Scala 
API 0.12.0 incubating org.apache.predictionio.controller.MetricEvaluator" />
+          <meta http-equiv="content-type" content="text/html; charset=UTF-8" />
+          
+      <link href="../../../../lib/template.css" media="screen" type="text/css" 
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+            var url = '../../../../index.html';
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+              anchor_opt = '@' + anchor.substring(1);
+            window.location.href = url + '#' + hash + anchor_opt;
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+         </script>
+    
+        </head>
+        <body class="type">
+      <div id="definition">
+        <a href="MetricEvaluator$.html" title="See companion object"><img 
alt="Class/Object" src="../../../../lib/class_to_object_big.png" /></a>
+        <p id="owner"><a href="../../../package.html" class="extype" 
name="org">org</a>.<a href="../../package.html" class="extype" 
name="org.apache">apache</a>.<a href="../package.html" class="extype" 
name="org.apache.predictionio">predictionio</a>.<a href="package.html" 
class="extype" name="org.apache.predictionio.controller">controller</a></p>
+        <h1><a href="MetricEvaluator$.html" title="See companion 
object">MetricEvaluator</a></h1><h3><span class="morelinks"><div>
+            Related Docs:
+            <a href="MetricEvaluator$.html" title="See companion 
object">object MetricEvaluator</a>
+            | <a href="package.html" class="extype" 
name="org.apache.predictionio.controller">package controller</a>
+          </div></span></h3><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      </div>
+
+      <h4 id="signature" class="signature">
+      <span class="modifier_kind">
+        <span class="modifier"></span>
+        <span class="kind">class</span>
+      </span>
+      <span class="symbol">
+        <span class="name">MetricEvaluator</span><span class="tparams">[<span 
name="EI">EI</span>, <span name="Q">Q</span>, <span name="P">P</span>, <span 
name="A">A</span>, <span name="R">R</span>]</span><span class="result"> extends 
<a href="../core/BaseEvaluator.html" class="extype" 
name="org.apache.predictionio.core.BaseEvaluator">BaseEvaluator</a>[<span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.EI">EI</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.Q">Q</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.P">P</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.A">A</span>, <a 
href="MetricEvaluatorResult.html" class="extype" 
name="org.apache.predictionio.controller.MetricEvaluatorResult">MetricEvaluatorResult</a>[<span
 class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.R">R</span>]]</span>
+      </span>
+      </h4>
+      
+          <div id="comment" class="fullcommenttop"><div class="comment 
cmt"><p>:: DeveloperApi ::
+Do no use this directly. Use <a href="MetricEvaluator$.html" class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator">MetricEvaluator$</a> 
instead. This is an
+implementation of <a href="../core/BaseEvaluator.html" class="extype" 
name="org.apache.predictionio.core.BaseEvaluator">org.apache.predictionio.core.BaseEvaluator</a>
 that evaluates
+prediction performance based on metric scores.
+</p></div><dl class="paramcmts block"><dt class="tparam">EI</dt><dd 
class="cmt"><p>Evaluation information type</p></dd><dt class="tparam">Q</dt><dd 
class="cmt"><p>Query class</p></dd><dt class="tparam">P</dt><dd 
class="cmt"><p>Predicted result class</p></dd><dt class="tparam">A</dt><dd 
class="cmt"><p>Actual result class</p></dd><dt class="tparam">R</dt><dd 
class="cmt"><p>Metric result class</p></dd></dl><dl class="attributes block"> 
<dt>Annotations</dt><dd>
+                <span class="name">@DeveloperApi</span><span 
class="args">()</span>
+              
+        </dd></dl><div class="toggleContainer block">
+          <span class="toggle">Linear Supertypes</span>
+          <div class="superTypes hiddenContent"><a 
href="../core/BaseEvaluator.html" class="extype" 
name="org.apache.predictionio.core.BaseEvaluator">BaseEvaluator</a>[<span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.EI">EI</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.Q">Q</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.P">P</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.A">A</span>, <a 
href="MetricEvaluatorResult.html" class="extype" 
name="org.apache.predictionio.controller.MetricEvaluatorResult">MetricEvaluatorResult</a>[<span
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name="org.apache.predictionio.controller.MetricEvaluator.R">R</span>]], <a 
href="../core/AbstractDoer.html" class="extype" 
name="org.apache.predictionio.core.AbstractDoer">AbstractDoer</a>, <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Serializable"; 
class="extype" target="_top">Seri
 alizable</a>, <span class="extype" 
name="java.io.Serializable">Serializable</span>, <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.AnyRef"; 
class="extype" target="_top">AnyRef</a>, <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Any"; class="extype" 
target="_top">Any</a></div>
+        </div></div>
+        
+
+      <div id="mbrsel">
+        <div id="textfilter"><span class="pre"></span><span 
class="input"><input id="mbrsel-input" type="text" accesskey="/" /></span><span 
class="post"></span></div>
+        <div id="order">
+              <span class="filtertype">Ordering</span>
+              <ol>
+                
+                <li class="alpha in"><span>Alphabetic</span></li>
+                <li class="inherit out"><span>By Inheritance</span></li>
+              </ol>
+            </div>
+        <div id="ancestors">
+                <span class="filtertype">Inherited<br />
+                </span>
+                <ol id="linearization">
+                  <li class="in" 
name="org.apache.predictionio.controller.MetricEvaluator"><span>MetricEvaluator</span></li><li
 class="in" 
name="org.apache.predictionio.core.BaseEvaluator"><span>BaseEvaluator</span></li><li
 class="in" 
name="org.apache.predictionio.core.AbstractDoer"><span>AbstractDoer</span></li><li
 class="in" name="scala.Serializable"><span>Serializable</span></li><li 
class="in" name="java.io.Serializable"><span>Serializable</span></li><li 
class="in" name="scala.AnyRef"><span>AnyRef</span></li><li class="in" 
name="scala.Any"><span>Any</span></li>
+                </ol>
+              </div><div id="ancestors">
+            <span class="filtertype"></span>
+            <ol>
+              <li class="hideall out"><span>Hide All</span></li>
+              <li class="showall in"><span>Show All</span></li>
+            </ol>
+          </div>
+        <div id="visbl">
+            <span class="filtertype">Visibility</span>
+            <ol><li class="public in"><span>Public</span></li><li class="all 
out"><span>All</span></li></ol>
+          </div>
+      </div>
+
+      <div id="template">
+        <div id="allMembers">
+        <div id="constructors" class="members">
+              <h3>Instance Constructors</h3>
+              <ol><li 
name="org.apache.predictionio.controller.MetricEvaluator#&lt;init&gt;" 
visbl="pub" data-isabs="false" fullComment="yes" group="Ungrouped">
+      <a 
id="&lt;init&gt;(metric:org.apache.predictionio.controller.Metric[EI,Q,P,A,R],otherMetrics:Seq[org.apache.predictionio.controller.Metric[EI,Q,P,A,_]],outputPath:Option[String]):org.apache.predictionio.controller.MetricEvaluator[EI,Q,P,A,R]"></a>
+      <a id="&lt;init&gt;:MetricEvaluator[EI,Q,P,A,R]"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier"></span>
+        <span class="kind">new</span>
+      </span>
+      <span class="symbol">
+        <span class="name">MetricEvaluator</span><span class="params">(<span 
name="metric">metric: <a href="Metric.html" class="extype" 
name="org.apache.predictionio.controller.Metric">Metric</a>[<span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.EI">EI</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.Q">Q</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.P">P</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.A">A</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.R">R</span>]</span>, 
<span name="otherMetrics">otherMetrics: <span class="extype" 
name="scala.Seq">Seq</span>[<a href="Metric.html" class="extype" 
name="org.apache.predictionio.controller.Metric">Metric</a>[<span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.EI">EI</span>, <span 
class="extype" name="org.apache.predictionio.contro
 ller.MetricEvaluator.Q">Q</span>, <span class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.P">P</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.A">A</span>, 
_]]</span>, <span name="outputPath">outputPath: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Option"; 
class="extype" target="_top">Option</a>[<span class="extype" 
name="scala.Predef.String">String</span>]</span>)</span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@&lt;init&gt;(metric:org.apache.predictionio.controller.Metric[EI,Q,P,A,R],otherMetrics:Seq[org.apache.predictionio.controller.Metric[EI,Q,P,A,_]],outputPath:Option[String]):org.apache.predictionio.controller.MetricEvaluator[EI,Q,P,A,R]"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <p class="shortcomment cmt"></p><div class="fullcomment"><div 
class="comment cmt"></div><dl class="paramcmts block"><dt 
class="param">metric</dt><dd class="cmt"><p>Primary metric</p></dd><dt 
class="param">otherMetrics</dt><dd class="cmt"><p>Other metrics</p></dd><dt 
class="param">outputPath</dt><dd class="cmt"><p>Optional output path to save 
evaluation results</p></dd></dl></div>
+    </li></ol>
+            </div>
+
+        
+
+        
+
+        <div id="values" class="values members">
+              <h3>Value Members</h3>
+              <ol><li name="scala.AnyRef#!=" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="!=(x$1:Any):Boolean"></a>
+      <a id="!=(Any):Boolean"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier">final </span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span title="gt4s: $bang$eq" class="name">!=</span><span 
class="params">(<span name="arg0">arg0: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Any"; class="extype" 
target="_top">Any</a></span>)</span><span class="result">: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Boolean"; 
class="extype" target="_top">Boolean</a></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@!=(x$1:Any):Boolean"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> <dt>Definition 
Classes</dt><dd>AnyRef → Any</dd></dl></div>
+    </li><li name="scala.AnyRef###" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="##():Int"></a>
+      <a id="##():Int"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier">final </span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span title="gt4s: $hash$hash" class="name">##</span><span 
class="params">()</span><span class="result">: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Int"; class="extype" 
target="_top">Int</a></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@##():Int"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> <dt>Definition 
Classes</dt><dd>AnyRef → Any</dd></dl></div>
+    </li><li name="scala.AnyRef#==" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="==(x$1:Any):Boolean"></a>
+      <a id="==(Any):Boolean"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier">final </span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span title="gt4s: $eq$eq" class="name">==</span><span 
class="params">(<span name="arg0">arg0: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Any"; class="extype" 
target="_top">Any</a></span>)</span><span class="result">: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Boolean"; 
class="extype" target="_top">Boolean</a></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@==(x$1:Any):Boolean"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> <dt>Definition 
Classes</dt><dd>AnyRef → Any</dd></dl></div>
+    </li><li name="scala.Any#asInstanceOf" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="asInstanceOf[T0]:T0"></a>
+      <a id="asInstanceOf[T0]:T0"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier">final </span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">asInstanceOf</span><span class="tparams">[<span 
name="T0">T0</span>]</span><span class="result">: <span class="extype" 
name="scala.Any.asInstanceOf.T0">T0</span></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@asInstanceOf[T0]:T0"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> <dt>Definition 
Classes</dt><dd>Any</dd></dl></div>
+    </li><li name="scala.AnyRef#clone" visbl="prt" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="clone():Object"></a>
+      <a id="clone():AnyRef"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier"></span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">clone</span><span class="params">()</span><span 
class="result">: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.AnyRef"; 
class="extype" target="_top">AnyRef</a></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@clone():Object"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> 
<dt>Attributes</dt><dd>protected[<a href="../../../../java$lang.html" 
class="extype" name="java.lang">java.lang</a>] </dd><dt>Definition 
Classes</dt><dd>AnyRef</dd><dt>Annotations</dt><dd>
+                <span class="name">@throws</span><span class="args">(<span>
+      
+      <span class="defval" 
name="classOf[java.lang.CloneNotSupportedException]">...</span>
+    </span>)</span>
+              
+        </dd></dl></div>
+    </li><li 
name="org.apache.predictionio.controller.MetricEvaluator#engineInstances" 
visbl="pub" data-isabs="false" fullComment="no" group="Ungrouped">
+      <a 
id="engineInstances:org.apache.predictionio.data.storage.EngineInstances"></a>
+      <a id="engineInstances:EngineInstances"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier"></span>
+        <span class="kind">val</span>
+      </span>
+      <span class="symbol">
+        <span class="name">engineInstances</span><span class="result">: <a 
href="../data/storage/EngineInstances.html" class="extype" 
name="org.apache.predictionio.data.storage.EngineInstances">EngineInstances</a></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@engineInstances:org.apache.predictionio.data.storage.EngineInstances"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      
+    </li><li name="scala.AnyRef#eq" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="eq(x$1:AnyRef):Boolean"></a>
+      <a id="eq(AnyRef):Boolean"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier">final </span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">eq</span><span class="params">(<span 
name="arg0">arg0: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.AnyRef"; 
class="extype" target="_top">AnyRef</a></span>)</span><span class="result">: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Boolean"; 
class="extype" target="_top">Boolean</a></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@eq(x$1:AnyRef):Boolean"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> <dt>Definition 
Classes</dt><dd>AnyRef</dd></dl></div>
+    </li><li name="scala.AnyRef#equals" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="equals(x$1:Any):Boolean"></a>
+      <a id="equals(Any):Boolean"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier"></span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">equals</span><span class="params">(<span 
name="arg0">arg0: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Any"; class="extype" 
target="_top">Any</a></span>)</span><span class="result">: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Boolean"; 
class="extype" target="_top">Boolean</a></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@equals(x$1:Any):Boolean"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> <dt>Definition 
Classes</dt><dd>AnyRef → Any</dd></dl></div>
+    </li><li 
name="org.apache.predictionio.controller.MetricEvaluator#evaluateBase" 
visbl="pub" data-isabs="false" fullComment="yes" group="Ungrouped">
+      <a 
id="evaluateBase(sc:org.apache.spark.SparkContext,evaluation:org.apache.predictionio.controller.Evaluation,engineEvalDataSet:Seq[(org.apache.predictionio.controller.EngineParams,Seq[(EI,org.apache.spark.rdd.RDD[(Q,P,A)])])],params:org.apache.predictionio.workflow.WorkflowParams):org.apache.predictionio.controller.MetricEvaluatorResult[R]"></a>
+      <a 
id="evaluateBase(SparkContext,Evaluation,Seq[(EngineParams,Seq[(EI,RDD[(Q,P,A)])])],WorkflowParams):MetricEvaluatorResult[R]"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier"></span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">evaluateBase</span><span class="params">(<span 
name="sc">sc: <span class="extype" 
name="org.apache.spark.SparkContext">SparkContext</span></span>, <span 
name="evaluation">evaluation: <a href="Evaluation.html" class="extype" 
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<span name="engineEvalDataSet">engineEvalDataSet: <span class="extype" 
name="scala.Seq">Seq</span>[(<a href="EngineParams.html" class="extype" 
name="org.apache.predictionio.controller.EngineParams">EngineParams</a>, <span 
class="extype" name="scala.Seq">Seq</span>[(<span class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.EI">EI</span>, <span 
class="extype" name="org.apache.spark.rdd.RDD">RDD</span>[(<span class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.Q">Q</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.P">P</span>, <span 
class="extype" name="org.apache.predictionio.controller.Me
 tricEvaluator.A">A</span>)])])]</span>, <span name="params">params: <a 
href="../workflow/WorkflowParams.html" class="extype" 
name="org.apache.predictionio.workflow.WorkflowParams">WorkflowParams</a></span>)</span><span
 class="result">: <a href="MetricEvaluatorResult.html" class="extype" 
name="org.apache.predictionio.controller.MetricEvaluatorResult">MetricEvaluatorResult</a>[<span
 class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.R">R</span>]</span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@evaluateBase(sc:org.apache.spark.SparkContext,evaluation:org.apache.predictionio.controller.Evaluation,engineEvalDataSet:Seq[(org.apache.predictionio.controller.EngineParams,Seq[(EI,org.apache.spark.rdd.RDD[(Q,P,A)])])],params:org.apache.predictionio.workflow.WorkflowParams):org.apache.predictionio.controller.MetricEvaluatorResult[R]"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <p class="shortcomment cmt">:: DeveloperApi ::
+Engine developers should not use this directly.</p><div 
class="fullcomment"><div class="comment cmt"><p>:: DeveloperApi ::
+Engine developers should not use this directly. This is called by
+evaluation workflow to perform evaluation.
+</p></div><dl class="paramcmts block"><dt class="param">sc</dt><dd 
class="cmt"><p>Spark context</p></dd><dt class="param">evaluation</dt><dd 
class="cmt"><p>Evaluation to run</p></dd><dt 
class="param">engineEvalDataSet</dt><dd class="cmt"><p>Sets of engine 
parameters and data for evaluation</p></dd><dt class="param">params</dt><dd 
class="cmt"><p>Evaluation workflow parameters</p></dd><dt>returns</dt><dd 
class="cmt"><p>Evaluation result</p></dd></dl><dl class="attributes block"> 
<dt>Definition Classes</dt><dd><a href="" class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator">MetricEvaluator</a> 
→ <a href="../core/BaseEvaluator.html" class="extype" 
name="org.apache.predictionio.core.BaseEvaluator">BaseEvaluator</a></dd></dl></div>
+    </li><li name="scala.AnyRef#finalize" visbl="prt" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="finalize():Unit"></a>
+      <a id="finalize():Unit"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier"></span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">finalize</span><span class="params">()</span><span 
class="result">: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Unit"; 
class="extype" target="_top">Unit</a></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@finalize():Unit"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> 
<dt>Attributes</dt><dd>protected[<a href="../../../../java$lang.html" 
class="extype" name="java.lang">java.lang</a>] </dd><dt>Definition 
Classes</dt><dd>AnyRef</dd><dt>Annotations</dt><dd>
+                <span class="name">@throws</span><span class="args">(<span>
+      
+      <span class="symbol">classOf[java.lang.Throwable]</span>
+    </span>)</span>
+              
+        </dd></dl></div>
+    </li><li name="scala.AnyRef#getClass" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="getClass():Class[_]"></a>
+      <a id="getClass():Class[_]"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier">final </span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">getClass</span><span class="params">()</span><span 
class="result">: <span class="extype" 
name="java.lang.Class">Class</span>[_]</span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@getClass():Class[_]"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> <dt>Definition 
Classes</dt><dd>AnyRef → Any</dd></dl></div>
+    </li><li name="scala.AnyRef#hashCode" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="hashCode():Int"></a>
+      <a id="hashCode():Int"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier"></span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">hashCode</span><span class="params">()</span><span 
class="result">: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Int"; class="extype" 
target="_top">Int</a></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@hashCode():Int"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> <dt>Definition 
Classes</dt><dd>AnyRef → Any</dd></dl></div>
+    </li><li name="scala.Any#isInstanceOf" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="isInstanceOf[T0]:Boolean"></a>
+      <a id="isInstanceOf[T0]:Boolean"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier">final </span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">isInstanceOf</span><span class="tparams">[<span 
name="T0">T0</span>]</span><span class="result">: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Boolean"; 
class="extype" target="_top">Boolean</a></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@isInstanceOf[T0]:Boolean"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> <dt>Definition 
Classes</dt><dd>Any</dd></dl></div>
+    </li><li name="org.apache.predictionio.controller.MetricEvaluator#logger" 
visbl="pub" data-isabs="false" fullComment="no" group="Ungrouped">
+      <a id="logger:grizzled.slf4j.Logger"></a>
+      <a id="logger:Logger"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier"></span>
+        <span class="kind">lazy val</span>
+      </span>
+      <span class="symbol">
+        <span class="name">logger</span><span class="result">: <span 
class="extype" name="grizzled.slf4j.Logger">Logger</span></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@logger:grizzled.slf4j.Logger"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      
+    </li><li name="org.apache.predictionio.controller.MetricEvaluator#metric" 
visbl="pub" data-isabs="false" fullComment="no" group="Ungrouped">
+      <a id="metric:org.apache.predictionio.controller.Metric[EI,Q,P,A,R]"></a>
+      <a id="metric:Metric[EI,Q,P,A,R]"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier"></span>
+        <span class="kind">val</span>
+      </span>
+      <span class="symbol">
+        <span class="name">metric</span><span class="result">: <a 
href="Metric.html" class="extype" 
name="org.apache.predictionio.controller.Metric">Metric</a>[<span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.EI">EI</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.Q">Q</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.P">P</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.A">A</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.R">R</span>]</span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@metric:org.apache.predictionio.controller.Metric[EI,Q,P,A,R]"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <p class="shortcomment cmt">Primary metric</p>
+    </li><li name="scala.AnyRef#ne" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="ne(x$1:AnyRef):Boolean"></a>
+      <a id="ne(AnyRef):Boolean"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier">final </span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">ne</span><span class="params">(<span 
name="arg0">arg0: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.AnyRef"; 
class="extype" target="_top">AnyRef</a></span>)</span><span class="result">: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Boolean"; 
class="extype" target="_top">Boolean</a></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@ne(x$1:AnyRef):Boolean"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> <dt>Definition 
Classes</dt><dd>AnyRef</dd></dl></div>
+    </li><li name="scala.AnyRef#notify" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="notify():Unit"></a>
+      <a id="notify():Unit"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier">final </span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">notify</span><span class="params">()</span><span 
class="result">: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Unit"; 
class="extype" target="_top">Unit</a></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@notify():Unit"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> <dt>Definition 
Classes</dt><dd>AnyRef</dd></dl></div>
+    </li><li name="scala.AnyRef#notifyAll" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="notifyAll():Unit"></a>
+      <a id="notifyAll():Unit"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier">final </span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">notifyAll</span><span class="params">()</span><span 
class="result">: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Unit"; 
class="extype" target="_top">Unit</a></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@notifyAll():Unit"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> <dt>Definition 
Classes</dt><dd>AnyRef</dd></dl></div>
+    </li><li 
name="org.apache.predictionio.controller.MetricEvaluator#otherMetrics" 
visbl="pub" data-isabs="false" fullComment="no" group="Ungrouped">
+      <a 
id="otherMetrics:Seq[org.apache.predictionio.controller.Metric[EI,Q,P,A,_]]"></a>
+      <a id="otherMetrics:Seq[Metric[EI,Q,P,A,_]]"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier"></span>
+        <span class="kind">val</span>
+      </span>
+      <span class="symbol">
+        <span class="name">otherMetrics</span><span class="result">: <span 
class="extype" name="scala.Seq">Seq</span>[<a href="Metric.html" class="extype" 
name="org.apache.predictionio.controller.Metric">Metric</a>[<span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.EI">EI</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.Q">Q</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.P">P</span>, <span 
class="extype" 
name="org.apache.predictionio.controller.MetricEvaluator.A">A</span>, _]]</span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@otherMetrics:Seq[org.apache.predictionio.controller.Metric[EI,Q,P,A,_]]"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <p class="shortcomment cmt">Other metrics</p>
+    </li><li 
name="org.apache.predictionio.controller.MetricEvaluator#outputPath" 
visbl="pub" data-isabs="false" fullComment="no" group="Ungrouped">
+      <a id="outputPath:Option[String]"></a>
+      <a id="outputPath:Option[String]"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier"></span>
+        <span class="kind">val</span>
+      </span>
+      <span class="symbol">
+        <span class="name">outputPath</span><span class="result">: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Option"; 
class="extype" target="_top">Option</a>[<span class="extype" 
name="scala.Predef.String">String</span>]</span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@outputPath:Option[String]"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <p class="shortcomment cmt">Optional output path to save evaluation 
results</p>
+    </li><li 
name="org.apache.predictionio.controller.MetricEvaluator#saveEngineJson" 
visbl="pub" data-isabs="false" fullComment="no" group="Ungrouped">
+      <a 
id="saveEngineJson(evaluation:org.apache.predictionio.controller.Evaluation,engineParams:org.apache.predictionio.controller.EngineParams,outputPath:String):Unit"></a>
+      <a id="saveEngineJson(Evaluation,EngineParams,String):Unit"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier"></span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">saveEngineJson</span><span class="params">(<span 
name="evaluation">evaluation: <a href="Evaluation.html" class="extype" 
name="org.apache.predictionio.controller.Evaluation">Evaluation</a></span>, 
<span name="engineParams">engineParams: <a href="EngineParams.html" 
class="extype" 
name="org.apache.predictionio.controller.EngineParams">EngineParams</a></span>, 
<span name="outputPath">outputPath: <span class="extype" 
name="scala.Predef.String">String</span></span>)</span><span class="result">: 
<a href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Unit"; 
class="extype" target="_top">Unit</a></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@saveEngineJson(evaluation:org.apache.predictionio.controller.Evaluation,engineParams:org.apache.predictionio.controller.EngineParams,outputPath:String):Unit"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      
+    </li><li name="scala.AnyRef#synchronized" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="synchronized[T0](x$1:=&gt;T0):T0"></a>
+      <a id="synchronized[T0](⇒T0):T0"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier">final </span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">synchronized</span><span class="tparams">[<span 
name="T0">T0</span>]</span><span class="params">(<span name="arg0">arg0: ⇒ 
<span class="extype" 
name="java.lang.AnyRef.synchronized.T0">T0</span></span>)</span><span 
class="result">: <span class="extype" 
name="java.lang.AnyRef.synchronized.T0">T0</span></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@synchronized[T0](x$1:=&gt;T0):T0"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> <dt>Definition 
Classes</dt><dd>AnyRef</dd></dl></div>
+    </li><li name="scala.AnyRef#toString" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="toString():String"></a>
+      <a id="toString():String"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier"></span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">toString</span><span class="params">()</span><span 
class="result">: <span class="extype" 
name="java.lang.String">String</span></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@toString():String"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> <dt>Definition 
Classes</dt><dd>AnyRef → Any</dd></dl></div>
+    </li><li name="scala.AnyRef#wait" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="wait():Unit"></a>
+      <a id="wait():Unit"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier">final </span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">wait</span><span class="params">()</span><span 
class="result">: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Unit"; 
class="extype" target="_top">Unit</a></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@wait():Unit"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> <dt>Definition 
Classes</dt><dd>AnyRef</dd><dt>Annotations</dt><dd>
+                <span class="name">@throws</span><span class="args">(<span>
+      
+      <span class="defval" 
name="classOf[java.lang.InterruptedException]">...</span>
+    </span>)</span>
+              
+        </dd></dl></div>
+    </li><li name="scala.AnyRef#wait" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="wait(x$1:Long,x$2:Int):Unit"></a>
+      <a id="wait(Long,Int):Unit"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier">final </span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">wait</span><span class="params">(<span 
name="arg0">arg0: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Long"; 
class="extype" target="_top">Long</a></span>, <span name="arg1">arg1: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Int"; class="extype" 
target="_top">Int</a></span>)</span><span class="result">: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Unit"; 
class="extype" target="_top">Unit</a></span>
+      </span>
+      </h4><span class="permalink">
+      <a 
href="../../../../index.html#org.apache.predictionio.controller.MetricEvaluator@wait(x$1:Long,x$2:Int):Unit"
 title="Permalink" target="_top">
+        <img src="../../../../lib/permalink.png" alt="Permalink" />
+      </a>
+    </span>
+      <div class="fullcomment"><dl class="attributes block"> <dt>Definition 
Classes</dt><dd>AnyRef</dd><dt>Annotations</dt><dd>
+                <span class="name">@throws</span><span class="args">(<span>
+      
+      <span class="defval" 
name="classOf[java.lang.InterruptedException]">...</span>
+    </span>)</span>
+              
+        </dd></dl></div>
+    </li><li name="scala.AnyRef#wait" visbl="pub" data-isabs="false" 
fullComment="yes" group="Ungrouped">
+      <a id="wait(x$1:Long):Unit"></a>
+      <a id="wait(Long):Unit"></a>
+      <h4 class="signature">
+      <span class="modifier_kind">
+        <span class="modifier">final </span>
+        <span class="kind">def</span>
+      </span>
+      <span class="symbol">
+        <span class="name">wait</span><span class="params">(<span 
name="arg0">arg0: <a 
href="http://www.scala-lang.org/api/2.11.8/index.html#scala.Long"; 
class="extype" target="_top">Long</a></span>)</span><span class="result">: <a 
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