| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <!-- NewPage --> |
| <html lang="en"> |
| <head> |
| <!-- Generated by javadoc (1.8.0_121) on Fri Apr 14 22:11:37 PDT 2017 --> |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> |
| <title>org.apache.mahout.classifier.df.mapreduce.inmem (Mahout Map-Reduce 0.13.0 API)</title> |
| <meta name="date" content="2017-04-14"> |
| <link rel="stylesheet" type="text/css" href="../../../../../../../stylesheet.css" title="Style"> |
| <script type="text/javascript" src="../../../../../../../script.js"></script> |
| </head> |
| <body> |
| <script type="text/javascript"><!-- |
| try { |
| if (location.href.indexOf('is-external=true') == -1) { |
| parent.document.title="org.apache.mahout.classifier.df.mapreduce.inmem (Mahout Map-Reduce 0.13.0 API)"; |
| } |
| } |
| catch(err) { |
| } |
| //--> |
| </script> |
| <noscript> |
| <div>JavaScript is disabled on your browser.</div> |
| </noscript> |
| <!-- ========= START OF TOP NAVBAR ======= --> |
| <div class="topNav"><a name="navbar.top"> |
| <!-- --> |
| </a> |
| <div class="skipNav"><a href="#skip.navbar.top" title="Skip navigation links">Skip navigation links</a></div> |
| <a name="navbar.top.firstrow"> |
| <!-- --> |
| </a> |
| <ul class="navList" title="Navigation"> |
| <li><a href="../../../../../../../overview-summary.html">Overview</a></li> |
| <li class="navBarCell1Rev">Package</li> |
| <li>Class</li> |
| <li><a href="package-use.html">Use</a></li> |
| <li><a href="package-tree.html">Tree</a></li> |
| <li><a href="../../../../../../../deprecated-list.html">Deprecated</a></li> |
| <li><a href="../../../../../../../index-all.html">Index</a></li> |
| <li><a href="../../../../../../../help-doc.html">Help</a></li> |
| </ul> |
| </div> |
| <div class="subNav"> |
| <ul class="navList"> |
| <li><a href="../../../../../../../org/apache/mahout/classifier/df/mapreduce/package-summary.html">Prev Package</a></li> |
| <li><a href="../../../../../../../org/apache/mahout/classifier/df/mapreduce/partial/package-summary.html">Next Package</a></li> |
| </ul> |
| <ul class="navList"> |
| <li><a href="../../../../../../../index.html?org/apache/mahout/classifier/df/mapreduce/inmem/package-summary.html" target="_top">Frames</a></li> |
| <li><a href="package-summary.html" target="_top">No Frames</a></li> |
| </ul> |
| <ul class="navList" id="allclasses_navbar_top"> |
| <li><a href="../../../../../../../allclasses-noframe.html">All Classes</a></li> |
| </ul> |
| <div> |
| <script type="text/javascript"><!-- |
| allClassesLink = document.getElementById("allclasses_navbar_top"); |
| if(window==top) { |
| allClassesLink.style.display = "block"; |
| } |
| else { |
| allClassesLink.style.display = "none"; |
| } |
| //--> |
| </script> |
| </div> |
| <a name="skip.navbar.top"> |
| <!-- --> |
| </a></div> |
| <!-- ========= END OF TOP NAVBAR ========= --> |
| <div class="header"> |
| <h1 title="Package" class="title">Package org.apache.mahout.classifier.df.mapreduce.inmem</h1> |
| <div class="docSummary"> |
| <div class="block">In-memory mapreduce implementation of Random Decision Forests</div> |
| </div> |
| <p>See: <a href="#package.description">Description</a></p> |
| </div> |
| <div class="contentContainer"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Class Summary table, listing classes, and an explanation"> |
| <caption><span>Class Summary</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Class</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../../org/apache/mahout/classifier/df/mapreduce/inmem/InMemBuilder.html" title="class in org.apache.mahout.classifier.df.mapreduce.inmem">InMemBuilder</a></td> |
| <td class="colLast">Deprecated</td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../../org/apache/mahout/classifier/df/mapreduce/inmem/InMemInputFormat.html" title="class in org.apache.mahout.classifier.df.mapreduce.inmem">InMemInputFormat</a></td> |
| <td class="colLast">Deprecated</td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../../org/apache/mahout/classifier/df/mapreduce/inmem/InMemInputFormat.InMemInputSplit.html" title="class in org.apache.mahout.classifier.df.mapreduce.inmem">InMemInputFormat.InMemInputSplit</a></td> |
| <td class="colLast"> |
| <div class="block">Custom InputSplit that indicates how many trees are built by each mapper</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../../../../org/apache/mahout/classifier/df/mapreduce/inmem/InMemInputFormat.InMemRecordReader.html" title="class in org.apache.mahout.classifier.df.mapreduce.inmem">InMemInputFormat.InMemRecordReader</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../../../../org/apache/mahout/classifier/df/mapreduce/inmem/InMemMapper.html" title="class in org.apache.mahout.classifier.df.mapreduce.inmem">InMemMapper</a></td> |
| <td class="colLast">Deprecated</td> |
| </tr> |
| </tbody> |
| </table> |
| </li> |
| </ul> |
| <a name="package.description"> |
| <!-- --> |
| </a> |
| <h2 title="Package org.apache.mahout.classifier.df.mapreduce.inmem Description">Package org.apache.mahout.classifier.df.mapreduce.inmem Description</h2> |
| <div class="block"><h2>In-memory mapreduce implementation of Random Decision Forests</h2> |
| |
| <p>Each mapper is responsible for growing a number of trees with a whole copy of the dataset loaded in memory, |
| it uses the reference implementation's code to build each tree and estimate the oob error.</p> |
| |
| <p>The dataset is distributed to the slave nodes using the <code>DistributedCache</code>. |
| A custom <code>InputFormat</code> |
| (<a href="../../../../../../../org/apache/mahout/classifier/df/mapreduce/inmem/InMemInputFormat.html" title="class in org.apache.mahout.classifier.df.mapreduce.inmem"><code>InMemInputFormat</code></a>) is configured with the |
| desired number of trees and generates a number of <code>InputSplit</code>s |
| equal to the configured number of maps.</p> |
| |
| <p>There is no need for reducers, each map outputs (the trees it built and, for each tree, the labels the |
| tree predicted for each out-of-bag instance. This step has to be done in the mapper because only there we |
| know which instances are o-o-b.</p> |
| |
| <p>The Forest builder (<a href="../../../../../../../org/apache/mahout/classifier/df/mapreduce/inmem/InMemBuilder.html" title="class in org.apache.mahout.classifier.df.mapreduce.inmem"><code>InMemBuilder</code></a>) is responsible |
| for configuring and launching the job. |
| At the end of the job it parses the output files and builds the corresponding |
| <a href="../../../../../../../org/apache/mahout/classifier/df/DecisionForest.html" title="class in org.apache.mahout.classifier.df"><code>DecisionForest</code></a>.</p></div> |
| </div> |
| <!-- ======= START OF BOTTOM NAVBAR ====== --> |
| <div class="bottomNav"><a name="navbar.bottom"> |
| <!-- --> |
| </a> |
| <div class="skipNav"><a href="#skip.navbar.bottom" title="Skip navigation links">Skip navigation links</a></div> |
| <a name="navbar.bottom.firstrow"> |
| <!-- --> |
| </a> |
| <ul class="navList" title="Navigation"> |
| <li><a href="../../../../../../../overview-summary.html">Overview</a></li> |
| <li class="navBarCell1Rev">Package</li> |
| <li>Class</li> |
| <li><a href="package-use.html">Use</a></li> |
| <li><a href="package-tree.html">Tree</a></li> |
| <li><a href="../../../../../../../deprecated-list.html">Deprecated</a></li> |
| <li><a href="../../../../../../../index-all.html">Index</a></li> |
| <li><a href="../../../../../../../help-doc.html">Help</a></li> |
| </ul> |
| </div> |
| <div class="subNav"> |
| <ul class="navList"> |
| <li><a href="../../../../../../../org/apache/mahout/classifier/df/mapreduce/package-summary.html">Prev Package</a></li> |
| <li><a href="../../../../../../../org/apache/mahout/classifier/df/mapreduce/partial/package-summary.html">Next Package</a></li> |
| </ul> |
| <ul class="navList"> |
| <li><a href="../../../../../../../index.html?org/apache/mahout/classifier/df/mapreduce/inmem/package-summary.html" target="_top">Frames</a></li> |
| <li><a href="package-summary.html" target="_top">No Frames</a></li> |
| </ul> |
| <ul class="navList" id="allclasses_navbar_bottom"> |
| <li><a href="../../../../../../../allclasses-noframe.html">All Classes</a></li> |
| </ul> |
| <div> |
| <script type="text/javascript"><!-- |
| allClassesLink = document.getElementById("allclasses_navbar_bottom"); |
| if(window==top) { |
| allClassesLink.style.display = "block"; |
| } |
| else { |
| allClassesLink.style.display = "none"; |
| } |
| //--> |
| </script> |
| </div> |
| <a name="skip.navbar.bottom"> |
| <!-- --> |
| </a></div> |
| <!-- ======== END OF BOTTOM NAVBAR ======= --> |
| <p class="legalCopy"><small>Copyright © 2008–2017 <a href="http://www.apache.org/">The Apache Software Foundation</a>. All rights reserved.</small></p> |
| </body> |
| </html> |
