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Subject [49/51] [abbrv] [partial] incubator-predictionio-site git commit: Documentation based on apache/incubator-predictionio#f92d2ac5d39a99565f07f2ffb64f17dfb8ae2d30
Date Fri, 06 Oct 2017 05:25:34 GMT
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+<!DOCTYPE html><html><head><title>Batch Predictions</title><meta charset="utf-8"/><meta content="IE=edge,chrome=1" http-equiv="X-UA-Compatible"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta class="swiftype" name="title" data-type="string" content="Batch Predictions"/><link rel="canonical" href="https://predictionio.incubator.apache.org/batchpredict/"/><link href="/images/favicon/normal-b330020a.png" rel="shortcut icon"/><link href="/images/favicon/apple-c0febcf2.png" rel="apple-touch-icon"/><link href="//fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800" rel="stylesheet"/><link href="//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet"/><link href="/stylesheets/application-3a3867f7.css" rel="stylesheet" type="text/css"/><script src="//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.2/html5shiv.min.js"></script><script src="//cdn.mathjax.org/mathjax/latest/Mat
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  hidden-lg" id="mobile-page-heading-wrapper"><p>PredictionIO Docs</p><h4>Batch Predictions</h4></div><h4 class="hidden-sm hidden-xs">PredictionIO Docs</h4></div><div class="col-md-3 col-sm-1 col-xs-1 hidden-md hidden-lg"><img id="left-menu-indicator" src="/images/icons/down-arrow-dfe9f7fe.png"/></div><div class="col-md-3 col-sm-12 col-xs-12 swiftype-wrapper"><div class="swiftype"><form class="search-form"><img class="search-box-toggler hidden-xs hidden-sm" src="/images/icons/search-glass-704bd4ff.png"/><div class="search-box"><img src="/images/icons/search-glass-704bd4ff.png"/><input type="text" id="st-search-input" class="st-search-input" placeholder="Search Doc..."/></div><img class="swiftype-row-hider hidden-md hidden-lg" src="/images/icons/drawer-toggle-active-fcbef12a.png"/></form></div></div><div class="mobile-left-menu-toggler hidden-md hidden-lg"></div></div></div></div><div id="page" class="container-fluid"><div class="row"><div id="left-menu-wrapper" class="col-md-3"><nav 
 id="nav-main"><ul><li class="level-1"><a class="expandible" href="/"><span>Apache PredictionIO (incubating) Documentation</span></a><ul><li class="level-2"><a class="final" href="/"><span>Welcome to Apache PredictionIO (incubating)</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Getting Started</span></a><ul><li class="level-2"><a class="final" href="/start/"><span>A Quick Intro</span></a></li><li class="level-2"><a class="final" href="/install/"><span>Installing Apache PredictionIO (incubating)</span></a></li><li class="level-2"><a class="final" href="/start/download/"><span>Downloading an Engine Template</span></a></li><li class="level-2"><a class="final" href="/start/deploy/"><span>Deploying Your First Engine</span></a></li><li class="level-2"><a class="final" href="/start/customize/"><span>Customizing the Engine</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Integrating with Your App</span></a><ul><li class="le
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 ible" href="#"><span>System Architecture</span></a><ul><li class="level-2"><a class="final" href="/system/"><span>Architecture Overview</span></a></li><li class="level-2"><a class="final" href="/system/anotherdatastore/"><span>Using Another Data Store</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>PredictionIO Official Templates</span></a><ul><li class="level-2"><a class="final" href="/templates/"><span>Intro</span></a></li><li class="level-2"><a class="expandible" href="#"><span>Recommendation</span></a><ul><li class="level-3"><a class="final" href="/templates/recommendation/quickstart/"><span>Quick Start</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/dase/"><span>DASE</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/evaluation/"><span>Evaluation Explained</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/how-to/"><span>How-To</span></a></li><
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 span>Community Contributed Demo</span></a></li><li class="level-2"><a class="final" href="/demo/textclassification/"><span>Text Classification Engine Tutorial</span></a></li></ul></li><li class="level-1"><a class="expandible" href="/community/"><span>Getting Involved</span></a><ul><li class="level-2"><a class="final" href="/community/contribute-code/"><span>Contribute Code</span></a></li><li class="level-2"><a class="final" href="/community/contribute-documentation/"><span>Contribute Documentation</span></a></li><li class="level-2"><a class="final" href="/community/contribute-sdk/"><span>Contribute a SDK</span></a></li><li class="level-2"><a class="final" href="/community/contribute-webhook/"><span>Contribute a Webhook</span></a></li><li class="level-2"><a class="final" href="/community/projects/"><span>Community Projects</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Getting Help</span></a><ul><li class="level-2"><a class="final" href="/resources/
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 che.org/licenses/"><span>License</span></a></li><li class="level-2"><a class="final" href="https://www.apache.org/foundation/sponsorship.html"><span>Sponsorship</span></a></li><li class="level-2"><a class="final" href="https://www.apache.org/foundation/thanks.html"><span>Thanks</span></a></li><li class="level-2"><a class="final" href="https://www.apache.org/security/"><span>Security</span></a></li></ul></li></ul></nav></div><div class="col-md-9 col-sm-12"><div class="content-header hidden-md hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a href="#">Deploying an Engine</a><span class="spacer">&gt;</span></li><li><span class="last">Batch Predictions</span></li></ul></div><div id="page-title"><h1>Batch Predictions</h1></div></div><div id="table-of-content-wrapper"><h5>On this page</h5><aside id="table-of-contents"><ul> <li> <a href="#overview">Overview</a> </li> <li> <a href="#compatibility">Compatibility</a> </li> <li> <a href="#usage">Usage</a> </li> <li> <a hr
 ef="#example">Example</a> </li> </ul> </aside><hr/><a id="edit-page-link" href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/batchpredict/index.html.md"><img src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div class="content-header hidden-sm hidden-xs"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a href="#">Deploying an Engine</a><span class="spacer">&gt;</span></li><li><span class="last">Batch Predictions</span></li></ul></div><div id="page-title"><h1>Batch Predictions</h1></div></div><div class="content"> <h2 id='overview' class='header-anchors'>Overview</h2><p>Process predictions for many queries using efficient parallelization through Spark. Useful for mass auditing of predictions and for generating predictions to push into other systems.</p><p>Batch predict reads and writes multi-object JSON files similar to the <a href="/datacollection/batchimport/">batch import</a> format. JSON objects are separated by n
 ewlines and cannot themselves contain unencoded newlines.</p><h2 id='compatibility' class='header-anchors'>Compatibility</h2><p><code>pio batchpredict</code> loads the engine and processes queries exactly like <code>pio deploy</code>. There is only one additional requirement for engines to utilize batch predict:</p><div class="alert-message warning"><p>All algorithm classes used in the engine must be <a href="https://www.scala-lang.org/api/2.11.8/index.html#scala.Serializable">serializable</a>. <strong>This is already true for PredictionIO&#39;s base algorithm classes</strong>, but may be broken by including non-serializable fields in their constructor. Using the <a href="http://fdahms.com/2015/10/14/scala-and-the-transient-lazy-val-pattern/"><code>@transient</code> annotation</a> may help in these cases.</p></div><p>This requirement is due to processing the input queries as a <a href="https://spark.apache.org/docs/latest/rdd-programming-guide.html#resilient-distributed-datasets-rdd
 s">Spark RDD</a> which enables high-performance parallelization, even on a single machine.</p><h2 id='usage' class='header-anchors'>Usage</h2><h3 id='<code>pio-batchpredict</code>' class='header-anchors' ><code>pio batchpredict</code></h3><p>Command to process bulk predictions. Takes the same options as <code>pio deploy</code> plus:</p><h3 id='<code>--input-&lt;value&gt;</code>' class='header-anchors' ><code>--input &lt;value&gt;</code></h3><p>Path to file containing queries; a multi-object JSON file with one query object per line. Accepts any valid Hadoop file URL.</p><p>Default: <code>batchpredict-input.json</code></p><h3 id='<code>--output-&lt;value&gt;</code>' class='header-anchors' ><code>--output &lt;value&gt;</code></h3><p>Path to file to receive results; a multi-object JSON file with one object per line, the prediction + original query. Accepts any valid Hadoop file URL. Actual output will be written as Hadoop partition files in a directory with the output name.</p><p>Defaul
 t: <code>batchpredict-output.json</code></p><h3 id='<code>--query-partitions-&lt;value&gt;</code>' class='header-anchors' ><code>--query-partitions &lt;value&gt;</code></h3><p>Configure the concurrency of predictions by setting the number of partitions used internally for the RDD of queries. This will directly effect the number of resulting <code>part-*</code> output files. While setting to <code>1</code> may seem appealing to get a single output file, this will remove parallelization for the batch process, reducing performance and possibly exhausting memory.</p><p>Default: number created by Spark context&#39;s <code>textFile</code> (probably the number of cores available on the local machine)</p><h3 id='<code>--engine-instance-id-&lt;value&gt;</code>' class='header-anchors' ><code>--engine-instance-id &lt;value&gt;</code></h3><p>Identifier for the trained instance to use for batch predict.</p><p>Default: the latest trained instance.</p><h2 id='example' class='header-anchors'>Exampl
 e</h2><h3 id='input' class='header-anchors'>Input</h3><p>A multi-object JSON file of queries as they would be sent to the engine&#39;s HTTP Queries API.</p><div class="alert-message note"><p>Read via <a href="https://spark.apache.org/docs/latest/rdd-programming-guide.html#external-datasets">SparkContext&#39;s <code>textFile</code></a> and so may be a single file or any supported Hadoop format.</p></div><p>File: <code>batchpredict-input.json</code></p><div class="highlight json"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5</pre></td><td class="code"><pre><span class="p">{</span><span class="s2">"user"</span><span class="p">:</span><span class="s2">"1"</span><span class="p">}</span><span class="w">
+</span><span class="p">{</span><span class="s2">"user"</span><span class="p">:</span><span class="s2">"2"</span><span class="p">}</span><span class="w">
+</span><span class="p">{</span><span class="s2">"user"</span><span class="p">:</span><span class="s2">"3"</span><span class="p">}</span><span class="w">
+</span><span class="p">{</span><span class="s2">"user"</span><span class="p">:</span><span class="s2">"4"</span><span class="p">}</span><span class="w">
+</span><span class="p">{</span><span class="s2">"user"</span><span class="p">:</span><span class="s2">"5"</span><span class="p">}</span><span class="w">
+</span></pre></td></tr></tbody></table> </div> <h3 id='execute' class='header-anchors'>Execute</h3><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3</pre></td><td class="code"><pre>pio batchpredict <span class="se">\</span>
+  --input batchpredict-input.json <span class="se">\</span>
+  --output batchpredict-output.json
+</pre></td></tr></tbody></table> </div> <p>This command will run to completion, aborting if any errors are encountered.</p><h3 id='output' class='header-anchors'>Output</h3><p>A multi-object JSON file of predictions + original queries. The predictions are JSON objects as they would be returned from the engine&#39;s HTTP Queries API.</p><div class="alert-message note"><p>Results are written via Spark RDD&#39;s <code>saveAsTextFile</code> so each partition will be written to its own <code>part-*</code> file. See <a href="#post-processing-results">post-processing results</a>.</p></div><p>File 1: <code>batchpredict-output.json/part-00000</code></p><div class="highlight json"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3</pre></td><td class="code"><pre><span class="p">{</span><span class="s2">"query"</span><span class="p">:{</span><span class="s2">"user"</span><span class="p">:</span><span class="s2">"1"</span><span class="p">},</span><span class="s2">"prediction"</span><span class="p">:{</span><span class="s2">"itemScores"</span><span class="p">:[{</span><span class="s2">"item"</span><span class="p">:</span><span class="s2">"1"</span><span class="p">,</span><span class="s2">"score"</span><span class="p">:</span><span class="mi">33</span><span class="p">},{</span><span class="s2">"item"</span><span class="p">:</span><span class="s2">"2"</span><span class="p">,</span><span class="s2">"score"</span><span class="p">:</span><span class="mi">32</span><span class="p">}]}}</span><span class="w">
+</span><span class="p">{</span><span class="s2">"query"</span><span class="p">:{</span><span class="s2">"user"</span><span class="p">:</span><span class="s2">"3"</span><span class="p">},</span><span class="s2">"prediction"</span><span class="p">:{</span><span class="s2">"itemScores"</span><span class="p">:[{</span><span class="s2">"item"</span><span class="p">:</span><span class="s2">"2"</span><span class="p">,</span><span class="s2">"score"</span><span class="p">:</span><span class="mi">16</span><span class="p">},{</span><span class="s2">"item"</span><span class="p">:</span><span class="s2">"3"</span><span class="p">,</span><span class="s2">"score"</span><span class="p">:</span><span class="mi">12</span><span class="p">}]}}</span><span class="w">
+</span><span class="p">{</span><span class="s2">"query"</span><span class="p">:{</span><span class="s2">"user"</span><span class="p">:</span><span class="s2">"4"</span><span class="p">},</span><span class="s2">"prediction"</span><span class="p">:{</span><span class="s2">"itemScores"</span><span class="p">:[{</span><span class="s2">"item"</span><span class="p">:</span><span class="s2">"3"</span><span class="p">,</span><span class="s2">"score"</span><span class="p">:</span><span class="mi">19</span><span class="p">},{</span><span class="s2">"item"</span><span class="p">:</span><span class="s2">"1"</span><span class="p">,</span><span class="s2">"score"</span><span class="p">:</span><span class="mi">18</span><span class="p">}]}}</span><span class="w">
+</span></pre></td></tr></tbody></table> </div> <p>File 2: <code>batchpredict-output.json/part-00001</code></p><div class="highlight json"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2</pre></td><td class="code"><pre><span class="p">{</span><span class="s2">"query"</span><span class="p">:{</span><span class="s2">"user"</span><span class="p">:</span><span class="s2">"2"</span><span class="p">},</span><span class="s2">"prediction"</span><span class="p">:{</span><span class="s2">"itemScores"</span><span class="p">:[{</span><span class="s2">"item"</span><span class="p">:</span><span class="s2">"5"</span><span class="p">,</span><span class="s2">"score"</span><span class="p">:</span><span class="mi">55</span><span class="p">},{</span><span class="s2">"item"</span><span class="p">:</span><span class="s2">"3"</span><span class="p">,</span><span class="s2">"score"</span><span class="p">:</span><span class="mi">28</span><span class="p">}]}}</span><span class="w">
+</span><span class="p">{</span><span class="s2">"query"</span><span class="p">:{</span><span class="s2">"user"</span><span class="p">:</span><span class="s2">"5"</span><span class="p">},</span><span class="s2">"prediction"</span><span class="p">:{</span><span class="s2">"itemScores"</span><span class="p">:[{</span><span class="s2">"item"</span><span class="p">:</span><span class="s2">"1"</span><span class="p">,</span><span class="s2">"score"</span><span class="p">:</span><span class="mi">24</span><span class="p">},{</span><span class="s2">"item"</span><span class="p">:</span><span class="s2">"4"</span><span class="p">,</span><span class="s2">"score"</span><span class="p">:</span><span class="mi">14</span><span class="p">}]}}</span><span class="w">
+</span></pre></td></tr></tbody></table> </div> <h3 id='post-processing-results' class='header-anchors'>Post-processing Results</h3><p>After the process exits successfully, the parts may be concatenated into a single output file using a command like:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre>cat batchpredict-output.json/part-<span class="k">*</span> &gt; batchpredict-output-all.json
+</pre></td></tr></tbody></table> </div> </div></div></div></div><footer><div class="container"><div class="seperator"></div><div class="row"><div class="col-md-6 footer-link-column"><div class="footer-link-column-row"><h4>Community</h4><ul><li><a href="//predictionio.incubator.apache.org/install/" target="blank">Download</a></li><li><a href="//predictionio.incubator.apache.org/" target="blank">Docs</a></li><li><a href="//github.com/apache/incubator-predictionio" target="blank">GitHub</a></li><li><a href="mailto:user-subscribe@predictionio.incubator.apache.org" target="blank">Subscribe to User Mailing List</a></li><li><a href="//stackoverflow.com/questions/tagged/predictionio" target="blank">Stackoverflow</a></li></ul></div></div><div class="col-md-6 footer-link-column"><div class="footer-link-column-row"><h4>Contribute</h4><ul><li><a href="//predictionio.incubator.apache.org/community/contribute-code/" target="blank">Contribute</a></li><li><a href="//github.com/apache/incubator-pred
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 <ul><li class="level-1"><a class="expandible" href="/"><span>Apache PredictionIO (incubating) Documentation</span></a><ul><li class="level-2"><a class="final" href="/"><span>Welcome to Apache PredictionIO (incubating)</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Getting Started</span></a><ul><li class="level-2"><a class="final" href="/start/"><span>A Quick Intro</span></a></li><li class="level-2"><a class="final" href="/install/"><span>Installing Apache PredictionIO (incubating)</span></a></li><li class="level-2"><a class="final" href="/start/download/"><span>Downloading an Engine Template</span></a></li><li class="level-2"><a class="final" href="/start/deploy/"><span>Deploying Your First Engine</span></a></li><li class="level-2"><a class="final" href="/start/customize/"><span>Customizing the Engine</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Integrating with Your App</span></a><ul><li class="level-2"><a clas
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  class="final" href="/templates/recommendation/reading-custom-events/"><span>Read Custom Events</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/customize-data-prep/"><span>Customize Data Preparator</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/customize-serving/"><span>Customize Serving</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/training-with-implicit-preference/"><span>Train with Implicit Preference</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/blacklist-items/"><span>Filter Recommended Items by Blacklist in Query</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/batch-evaluator/"><span>Batch Persistable Evaluator</span></a></li></ul></li><li class="level-2"><a class="expandible" href="#"><span>E-Commerce Recommendation</span></a><ul><li class="level-3"><a class="final" href="/templates/ecommercere
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 buted Demo</span></a></li><li class="level-2"><a class="final" href="/demo/textclassification/"><span>Text Classification Engine Tutorial</span></a></li></ul></li><li class="level-1"><a class="expandible" href="/community/"><span>Getting Involved</span></a><ul><li class="level-2"><a class="final" href="/community/contribute-code/"><span>Contribute Code</span></a></li><li class="level-2"><a class="final" href="/community/contribute-documentation/"><span>Contribute Documentation</span></a></li><li class="level-2"><a class="final" href="/community/contribute-sdk/"><span>Contribute a SDK</span></a></li><li class="level-2"><a class="final" href="/community/contribute-webhook/"><span>Contribute a Webhook</span></a></li><li class="level-2"><a class="final" href="/community/projects/"><span>Community Projects</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Getting Help</span></a><ul><li class="level-2"><a class="final" href="/resources/faq/"><span>FAQs</spa
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 es/"><span>License</span></a></li><li class="level-2"><a class="final" href="https://www.apache.org/foundation/sponsorship.html"><span>Sponsorship</span></a></li><li class="level-2"><a class="final" href="https://www.apache.org/foundation/thanks.html"><span>Thanks</span></a></li><li class="level-2"><a class="final" href="https://www.apache.org/security/"><span>Security</span></a></li></ul></li></ul></nav></div><div class="col-md-9 col-sm-12"><div class="content-header hidden-md hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a href="#">Resources</a><span class="spacer">&gt;</span></li><li><span class="last">Command-line Interface</span></li></ul></div><div id="page-title"><h1>Command Line</h1></div></div><div id="table-of-content-wrapper"><h5>On this page</h5><aside id="table-of-contents"><ul> <li> <a href="#overview">Overview</a> </li> <li> <a href="#general-commands">General Commands</a> </li> <li> <a href="#event-server-commands">Event Server Commands</a> </
 li> <li> <a href="#engine-commands">Engine Commands</a> </li> </ul> </aside><hr/><a id="edit-page-link" href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/cli/index.html.md"><img src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div class="content-header hidden-sm hidden-xs"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a href="#">Resources</a><span class="spacer">&gt;</span></li><li><span class="last">Command-line Interface</span></li></ul></div><div id="page-title"><h1>Command Line</h1></div></div><div class="content"> <h2 id='overview' class='header-anchors'>Overview</h2><p>Interaction with Apache PredictionIO (incubating) is done through the command line interface. It follows the format of:</p><p><code>pio &lt;command&gt; [options] &lt;args&gt;...</code></p><p>You can run <code>pio help</code> to see a list of all available commands and <code>pio help &lt;command&gt;</code> to see details of the command.</p><p
 >Apache PredictionIO (incubating) commands can be separated into the following three categories.</p><h2 id='general-commands' class='header-anchors'>General Commands</h2><p><code>pio help</code> Display usage summary. <code>pio help &lt;command&gt;</code> to read about a specific subcommand.</p><p><code>pio version</code> Displays the version of the installed PredictionIO.</p><p><code>pio status</code> Displays install path and running status of PredictionIO system and its dependencies.</p><h2 id='event-server-commands' class='header-anchors'>Event Server Commands</h2><p><code>pio eventserver</code> Launch the Event Server.</p><p><code>pio app</code> Manage apps that are used by the Event Server.</p><p><code>pio app data-delete &lt;name&gt;</code> deletes all data associated with the app.</p><p><code>pio app delete &lt;name&gt;</code> deletes the app and its data.</p><p> <code>--ip &lt;value&gt;</code> IP to bind to. Default to localhost.</p><p> <code>--port &lt;value&gt;</code> Por
 t to bind to. Default to 7070.</p><p><code>pio accesskey</code> Manage app access keys.</p><h2 id='engine-commands' class='header-anchors'>Engine Commands</h2><p>Engine commands need to be run from the directory that contains the engine project. <code>--debug</code> and <code>--verbose</code> flags will provide debug and third-party informational messages.</p><p><code>pio build</code> Build the engine at the current directory.</p><p><code>pio train</code> Kick off a training using an engine.</p><p><code>pio deploy</code> Deploy an engine as an engine server.</p><p><code>pio batchpredict</code> Process bulk predictions using an engine.</p><p>For <code>deploy</code> &amp; <code>batchpredict</code>, if <code>--engine-instance-id</code> is not specified, it will use the latest trained instance.</p></div></div></div></div><footer><div class="container"><div class="seperator"></div><div class="row"><div class="col-md-6 footer-link-column"><div class="footer-link-column-row"><h4>Community<
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+<!DOCTYPE html><html><head><title>Contribute Code</title><meta charset="utf-8"/><meta content="IE=edge,chrome=1" http-equiv="X-UA-Compatible"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta class="swiftype" name="title" data-type="string" content="Contribute Code"/><link rel="canonical" href="https://predictionio.incubator.apache.org/community/contribute-code/"/><link href="/images/favicon/normal-b330020a.png" rel="shortcut icon"/><link href="/images/favicon/apple-c0febcf2.png" rel="apple-touch-icon"/><link href="//fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800" rel="stylesheet"/><link href="//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet"/><link href="/stylesheets/application-3a3867f7.css" rel="stylesheet" type="text/css"/><script src="//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.2/html5shiv.min.js"></script><script src="//cdn.mathjax.org/mathjax/l
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 hidden-md hidden-lg" id="mobile-page-heading-wrapper"><p>PredictionIO Docs</p><h4>Contribute Code</h4></div><h4 class="hidden-sm hidden-xs">PredictionIO Docs</h4></div><div class="col-md-3 col-sm-1 col-xs-1 hidden-md hidden-lg"><img id="left-menu-indicator" src="/images/icons/down-arrow-dfe9f7fe.png"/></div><div class="col-md-3 col-sm-12 col-xs-12 swiftype-wrapper"><div class="swiftype"><form class="search-form"><img class="search-box-toggler hidden-xs hidden-sm" src="/images/icons/search-glass-704bd4ff.png"/><div class="search-box"><img src="/images/icons/search-glass-704bd4ff.png"/><input type="text" id="st-search-input" class="st-search-input" placeholder="Search Doc..."/></div><img class="swiftype-row-hider hidden-md hidden-lg" src="/images/icons/drawer-toggle-active-fcbef12a.png"/></form></div></div><div class="mobile-left-menu-toggler hidden-md hidden-lg"></div></div></div></div><div id="page" class="container-fluid"><div class="row"><div id="left-menu-wrapper" class="col-md-3
 "><nav id="nav-main"><ul><li class="level-1"><a class="expandible" href="/"><span>Apache PredictionIO (incubating) Documentation</span></a><ul><li class="level-2"><a class="final" href="/"><span>Welcome to Apache PredictionIO (incubating)</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Getting Started</span></a><ul><li class="level-2"><a class="final" href="/start/"><span>A Quick Intro</span></a></li><li class="level-2"><a class="final" href="/install/"><span>Installing Apache PredictionIO (incubating)</span></a></li><li class="level-2"><a class="final" href="/start/download/"><span>Downloading an Engine Template</span></a></li><li class="level-2"><a class="final" href="/start/deploy/"><span>Deploying Your First Engine</span></a></li><li class="level-2"><a class="final" href="/start/customize/"><span>Customizing the Engine</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Integrating with Your App</span></a><ul><li cl
 ass="level-2"><a class="final" href="/appintegration/"><span>App Integration Overview</span></a></li><li class="level-2"><a class="expandible" href="/sdk/"><span>List of SDKs</span></a><ul><li class="level-3"><a class="final" href="/sdk/java/"><span>Java & Android SDK</span></a></li><li class="level-3"><a class="final" href="/sdk/php/"><span>PHP SDK</span></a></li><li class="level-3"><a class="final" href="/sdk/python/"><span>Python SDK</span></a></li><li class="level-3"><a class="final" href="/sdk/ruby/"><span>Ruby SDK</span></a></li><li class="level-3"><a class="final" href="/sdk/community/"><span>Community Powered SDKs</span></a></li></ul></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Deploying an Engine</span></a><ul><li class="level-2"><a class="final" href="/deploy/"><span>Deploying as a Web Service</span></a></li><li class="level-2"><a class="final" href="/batchpredict/"><span>Batch Predictions</span></a></li><li class="level-2"><a class="final" href=
 "/deploy/monitoring/"><span>Monitoring Engine</span></a></li><li class="level-2"><a class="final" href="/deploy/engineparams/"><span>Setting Engine Parameters</span></a></li><li class="level-2"><a class="final" href="/deploy/enginevariants/"><span>Deploying Multiple Engine Variants</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Customizing an Engine</span></a><ul><li class="level-2"><a class="final" href="/customize/"><span>Learning DASE</span></a></li><li class="level-2"><a class="final" href="/customize/dase/"><span>Implement DASE</span></a></li><li class="level-2"><a class="final" href="/customize/troubleshooting/"><span>Troubleshooting Engine Development</span></a></li><li class="level-2"><a class="final" href="/api/current/#package"><span>Engine Scala APIs</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Collecting and Analyzing Data</span></a><ul><li class="level-2"><a class="final" href="/datacollection/"><sp
 an>Event Server Overview</span></a></li><li class="level-2"><a class="final" href="/datacollection/eventapi/"><span>Collecting Data with REST/SDKs</span></a></li><li class="level-2"><a class="final" href="/datacollection/eventmodel/"><span>Events Modeling</span></a></li><li class="level-2"><a class="final" href="/datacollection/webhooks/"><span>Unifying Multichannel Data with Webhooks</span></a></li><li class="level-2"><a class="final" href="/datacollection/channel/"><span>Channel</span></a></li><li class="level-2"><a class="final" href="/datacollection/batchimport/"><span>Importing Data in Batch</span></a></li><li class="level-2"><a class="final" href="/datacollection/analytics/"><span>Using Analytics Tools</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Choosing an Algorithm(s)</span></a><ul><li class="level-2"><a class="final" href="/algorithm/"><span>Built-in Algorithm Libraries</span></a></li><li class="level-2"><a class="final" href="/algorith
 m/switch/"><span>Switching to Another Algorithm</span></a></li><li class="level-2"><a class="final" href="/algorithm/multiple/"><span>Combining Multiple Algorithms</span></a></li><li class="level-2"><a class="final" href="/algorithm/custom/"><span>Adding Your Own Algorithms</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>ML Tuning and Evaluation</span></a><ul><li class="level-2"><a class="final" href="/evaluation/"><span>Overview</span></a></li><li class="level-2"><a class="final" href="/evaluation/paramtuning/"><span>Hyperparameter Tuning</span></a></li><li class="level-2"><a class="final" href="/evaluation/evaluationdashboard/"><span>Evaluation Dashboard</span></a></li><li class="level-2"><a class="final" href="/evaluation/metricchoose/"><span>Choosing Evaluation Metrics</span></a></li><li class="level-2"><a class="final" href="/evaluation/metricbuild/"><span>Building Evaluation Metrics</span></a></li></ul></li><li class="level-1"><a class="expand
 ible" href="#"><span>System Architecture</span></a><ul><li class="level-2"><a class="final" href="/system/"><span>Architecture Overview</span></a></li><li class="level-2"><a class="final" href="/system/anotherdatastore/"><span>Using Another Data Store</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>PredictionIO Official Templates</span></a><ul><li class="level-2"><a class="final" href="/templates/"><span>Intro</span></a></li><li class="level-2"><a class="expandible" href="#"><span>Recommendation</span></a><ul><li class="level-3"><a class="final" href="/templates/recommendation/quickstart/"><span>Quick Start</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/dase/"><span>DASE</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/evaluation/"><span>Evaluation Explained</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/how-to/"><span>How-To</span></a></li><
 li class="level-3"><a class="final" href="/templates/recommendation/reading-custom-events/"><span>Read Custom Events</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/customize-data-prep/"><span>Customize Data Preparator</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/customize-serving/"><span>Customize Serving</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/training-with-implicit-preference/"><span>Train with Implicit Preference</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/blacklist-items/"><span>Filter Recommended Items by Blacklist in Query</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/batch-evaluator/"><span>Batch Persistable Evaluator</span></a></li></ul></li><li class="level-2"><a class="expandible" href="#"><span>E-Commerce Recommendation</span></a><ul><li class="level-3"><a class="final" href="/
 templates/ecommercerecommendation/quickstart/"><span>Quick Start</span></a></li><li class="level-3"><a class="final" href="/templates/ecommercerecommendation/dase/"><span>DASE</span></a></li><li class="level-3"><a class="final" href="/templates/ecommercerecommendation/how-to/"><span>How-To</span></a></li><li class="level-3"><a class="final" href="/templates/ecommercerecommendation/train-with-rate-event/"><span>Train with Rate Event</span></a></li><li class="level-3"><a class="final" href="/templates/ecommercerecommendation/adjust-score/"><span>Adjust Score</span></a></li></ul></li><li class="level-2"><a class="expandible" href="#"><span>Similar Product</span></a><ul><li class="level-3"><a class="final" href="/templates/similarproduct/quickstart/"><span>Quick Start</span></a></li><li class="level-3"><a class="final" href="/templates/similarproduct/dase/"><span>DASE</span></a></li><li class="level-3"><a class="final" href="/templates/similarproduct/how-to/"><span>How-To</span></a></li
 ><li class="level-3"><a class="final" href="/templates/similarproduct/multi-events-multi-algos/"><span>Multiple Events and Multiple Algorithms</span></a></li><li class="level-3"><a class="final" href="/templates/similarproduct/return-item-properties/"><span>Returns Item Properties</span></a></li><li class="level-3"><a class="final" href="/templates/similarproduct/train-with-rate-event/"><span>Train with Rate Event</span></a></li><li class="level-3"><a class="final" href="/templates/similarproduct/rid-user-set-event/"><span>Get Rid of Events for Users</span></a></li><li class="level-3"><a class="final" href="/templates/similarproduct/recommended-user/"><span>Recommend Users</span></a></li></ul></li><li class="level-2"><a class="expandible" href="#"><span>Classification</span></a><ul><li class="level-3"><a class="final" href="/templates/classification/quickstart/"><span>Quick Start</span></a></li><li class="level-3"><a class="final" href="/templates/classification/dase/"><span>DASE</s
 pan></a></li><li class="level-3"><a class="final" href="/templates/classification/how-to/"><span>How-To</span></a></li><li class="level-3"><a class="final" href="/templates/classification/add-algorithm/"><span>Use Alternative Algorithm</span></a></li><li class="level-3"><a class="final" href="/templates/classification/reading-custom-properties/"><span>Read Custom Properties</span></a></li></ul></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Engine Template Gallery</span></a><ul><li class="level-2"><a class="final" href="/gallery/template-gallery/"><span>Browse</span></a></li><li class="level-2"><a class="final" href="/community/submit-template/"><span>Submit your Engine as a Template</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Demo Tutorials</span></a><ul><li class="level-2"><a class="final" href="/demo/tapster/"><span>Comics Recommendation Demo</span></a></li><li class="level-2"><a class="final" href="/demo/community/"><
 span>Community Contributed Demo</span></a></li><li class="level-2"><a class="final" href="/demo/textclassification/"><span>Text Classification Engine Tutorial</span></a></li></ul></li><li class="level-1"><a class="expandible" href="/community/"><span>Getting Involved</span></a><ul><li class="level-2"><a class="final active" href="/community/contribute-code/"><span>Contribute Code</span></a></li><li class="level-2"><a class="final" href="/community/contribute-documentation/"><span>Contribute Documentation</span></a></li><li class="level-2"><a class="final" href="/community/contribute-sdk/"><span>Contribute a SDK</span></a></li><li class="level-2"><a class="final" href="/community/contribute-webhook/"><span>Contribute a Webhook</span></a></li><li class="level-2"><a class="final" href="/community/projects/"><span>Community Projects</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Getting Help</span></a><ul><li class="level-2"><a class="final" href="/res
 ources/faq/"><span>FAQs</span></a></li><li class="level-2"><a class="final" href="/support/"><span>Support</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Resources</span></a><ul><li class="level-2"><a class="final" href="/cli/"><span>Command-line Interface</span></a></li><li class="level-2"><a class="final" href="/resources/release/"><span>Release Cadence</span></a></li><li class="level-2"><a class="final" href="/resources/intellij/"><span>Developing Engines with IntelliJ IDEA</span></a></li><li class="level-2"><a class="final" href="/resources/upgrade/"><span>Upgrade Instructions</span></a></li><li class="level-2"><a class="final" href="/resources/glossary/"><span>Glossary</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Apache Software Foundation</span></a><ul><li class="level-2"><a class="final" href="https://www.apache.org/"><span>Apache Homepage</span></a></li><li class="level-2"><a class="final" href="https://
 www.apache.org/licenses/"><span>License</span></a></li><li class="level-2"><a class="final" href="https://www.apache.org/foundation/sponsorship.html"><span>Sponsorship</span></a></li><li class="level-2"><a class="final" href="https://www.apache.org/foundation/thanks.html"><span>Thanks</span></a></li><li class="level-2"><a class="final" href="https://www.apache.org/security/"><span>Security</span></a></li></ul></li></ul></nav></div><div class="col-md-9 col-sm-12"><div class="content-header hidden-md hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a href="/community/">Getting Involved</a><span class="spacer">&gt;</span></li><li><span class="last">Contribute Code</span></li></ul></div><div id="page-title"><h1>Contribute Code</h1></div></div><div id="table-of-content-wrapper"><h5>On this page</h5><aside id="table-of-contents"><ul> <li> <a href="#areas-in-need-of-help">Areas in Need of Help</a> </li> <li> <a href="#how-to-report-an-issue">How to Report an Issue</a> 
 </li> <li> <a href="#how-to-help-resolve-existing-issues">How to Help Resolve Existing Issues</a> </li> <li> <a href="#how-to-add-propose-a-new-feature">How to Add / Propose a New Feature</a> </li> <li> <a href="#how-to-issue-a-pull-request">How to Issue a Pull Request</a> </li> <li> <a href="#getting-started">Getting Started</a> </li> <li> <a href="#anatomy-of-apache-predictionio-incubating-code-tree">Anatomy of Apache PredictionIO (incubating) Code Tree</a> </li> </ul> </aside><hr/><a id="edit-page-link" href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/community/contribute-code.html.md"><img src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div class="content-header hidden-sm hidden-xs"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a href="/community/">Getting Involved</a><span class="spacer">&gt;</span></li><li><span class="last">Contribute Code</span></li></ul></div><div id="page-title"><h1>Contribute Code</
 h1></div></div><div class="content"> <p>Thank you for your interest in contributing to Apache PredictionIO (incubating). Our mission is to enable developers to build scalable machine learning applications easily. Here is how you can help with the project development. If you have any question regarding development at anytime, please free to <a href="mailto:dev-subscribe@predictionio.incubator.apache.org">subscribe</a> and post to the <a href="mailto:dev-subscribe@predictionio.incubator.apache.org">Development Mailing List</a>.</p><h2 id='areas-in-need-of-help' class='header-anchors'>Areas in Need of Help</h2><p>We accept contributions of all kinds at any time. We are compiling this list to show features that are highly sought after by the community.</p> <ul> <li>Tests and CI</li> <li>Engine template, tutorials, and samples</li> <li>Client SDKs</li> <li>Building engines in Java (updating the Java controller API)</li> <li>Code clean up and refactoring</li> <li>Code and data pipeline op
 timization</li> <li>Developer experience (UX) improvement</li> </ul> <h2 id='how-to-report-an-issue' class='header-anchors'>How to Report an Issue</h2><p>If you wish to report an issue you found, you can do so on <a href="https://issues.apache.org/jira/browse/PIO">Apache PredictionIO (incubating) JIRA</a>.</p><h2 id='how-to-help-resolve-existing-issues' class='header-anchors'>How to Help Resolve Existing Issues</h2><p>In general, bug fixes should be done the same way as new features, but critical bug fixes will follow a different path.</p><h2 id='how-to-add-/-propose-a-new-feature' class='header-anchors'>How to Add / Propose a New Feature</h2><p>Before adding new features into JIRA, please check that the feature does not currently exist in JIRA.</p> <ol> <li>To propose a new feature, simply <a href="mailto:dev-subscribe@predictionio.incubator.apache.org">subscribe</a> and post your proposal to <a href="mailto:dev@predictionio.incubator.apache.org">Apache PredictionIO (incubating) De
 velopment Mailing List</a>.</li> <li>Discuss with the community and the core development team on what needs to be done, and lay down concrete plans on deliverables.</li> <li>Once solid plans are made, start creating tickets in the <a href="https://issues.apache.org/jira/browse/PIO">issue tracker</a>.</li> <li>Work side by side with other developers using Apache PredictionIO (incubating) Development Mailing List as primary mode of communication. You never know if someone else has a better idea. ;)</li> </ol> <h3 id='adding-ticket-to-jira' class='header-anchors'>Adding ticket to JIRA</h3> <ol> <li>Add a descriptive Summary and a detailed description</li> <li>Set Issue Type to Bug, Improvement, New Feature, Test or Wish</li> <li>Set Priority to Blocker, Critical, Major, Minor or Trivial</li> <li>Fill out Affects Version with the version of PredictionIO you are currently using</li> <li>Fill out Environment if needed for description of your bug / feature</li> <li>Please leave other field
 s blank</li> </ol> <h3 id='triaging-jira' class='header-anchors'>Triaging JIRA</h3><p>Tickets will be triaged by PredictionIO committers.</p> <ul> <li><p><strong>Target Version</strong>: Either a particular version or <code>Future</code> if to be done later</p> <ul> <li>Once a fix has been committed, the Fix Version will filled in with the appropriate release</li> </ul></li> <li><p><strong>Component</strong>: Each ticket will be annotated with one or more of the following Components</p> <ul> <li><strong>Core</strong>: affects the main code branch / will be part of a release</li> <li><strong>Documentation</strong>: affects the documents / will be pushed to livedoc branch</li> <li><strong>Templates</strong>: affects one of the separate github repositories for a template</li> </ul></li> </ul> <h2 id='how-to-issue-a-pull-request' class='header-anchors'>How to Issue a Pull Request</h2><p>When you have finished your code, you can <a href="https://help.github.com/articles/creating-a-pull-r
 equest/">create a pull request</a> against the <strong>develop</strong> branch.</p> <ul> <li>The title must contain a tag associating with an existing JIRA ticket. You must create a ticket so that the infrastructure can correctly track issues across Apache JIRA and GitHub. If your ticket is <code>PIO-789</code>, your title must look something like <code>[PIO-789] Some short description</code>.</li> <li>Please also, in your commit message summary, include the JIRA ticket number similar to above.</li> <li>Make sure the title and description are clear and concise. For more details on writing a good commit message, check out <a href="http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html">this guide</a>.</li> <li>If the change is visual, make sure to include a screenshot or GIF.</li> <li>Make sure it is being opened into the right branch.</li> <li>Make sure it has been rebased on top of that branch.</li> </ul> <div class="alert-message note"><p>When it is close to a releas
 e, and if there are major development ongoing, a release branch will be forked from the develop branch to stabilize the code for binary release. Please refer to the <em>git flow</em> methodology page for more information.</p></div><h2 id='getting-started' class='header-anchors'>Getting Started</h2><p>Apache PredictionIO (incubating) relies heavily on the <a href="http://nvie.com/posts/a-successful-git-branching-model/">git flow methodology</a>. Please make sure you read and understand it before you start your development. By default, cloning Apache PredictionIO (incubating) will put you in the <em>develop</em> branch, which in most cases is where all the latest development go to.</p><div class="alert-message note"><p>For core development, please follow the <a href="http://docs.scala-lang.org/style/">Scala Style Guide</a>.</p></div><h3 id='create-a-fork-of-the-apache-predictionio-(incubating)-repository' class='header-anchors'>Create a Fork of the Apache PredictionIO (incubating) Rep
 ository</h3> <ol> <li>Start by creating a GitHub account if you do not already have one.</li> <li>Go to <a href="https://github.com/PredictionIO/PredictionIO">Apache PredictionIO (incubating)’s GitHub mirror</a> and fork it to your own account.</li> <li>Clone your fork to your local machine.</li> </ol> <p>If you need additional help, please refer to <a href="https://help.github.com/articles/fork-a-repo/">https://help.github.com/articles/fork-a-repo/</a>.</p><h3 id='building-apache-predictionio-(incubating)-from-source' class='header-anchors'>Building Apache PredictionIO (incubating) from Source</h3><p>After the previous section, you should have a copy of Apache PredictionIO (incubating) in your local machine ready to be built.</p> <ol> <li>Make sure you are on the <em>develop</em> branch. You can double check by <code>git status</code> or simply <code>git checkout develop</code>.</li> <li>At the root of the repository, do <code>./make-distribution.sh</code> to build PredictionIO.<
 /li> </ol> <h3 id='setting-up-the-environment' class='header-anchors'>Setting Up the Environment</h3><p>Apache PredictionIO (incubating) relies on 3rd party software to perform its tasks. To set them up, simply follow this <a href="http://predictionio.incubator.apache.org/install/install-sourcecode/#installing-dependencies">documentation</a>.</p><h3 id='start-hacking' class='header-anchors'>Start Hacking</h3><p>You should have a Apache PredictionIO (incubating) development environment by now. Happy hacking!</p><h2 id='anatomy-of-apache-predictionio-(incubating)-code-tree' class='header-anchors'>Anatomy of Apache PredictionIO (incubating) Code Tree</h2><p>The following describes each directory’s purpose.</p><h3 id='bin' class='header-anchors'>bin</h3><p>Shell scripts and any relevant components to go into the binary distribution. Utility shell scripts can also be included here.</p><h3 id='conf' class='header-anchors'>conf</h3><p>Configuration files that are used by both a source tr
 ee and binary distribution.</p><h3 id='core' class='header-anchors'>core</h3><p>Core Apache PredictionIO (incubating) code that provides the DASE controller API, core data structures, and workflow creation and management code.</p><h3 id='data' class='header-anchors'>data</h3><p>Apache PredictionIO (incubating) Event Server, and backend-agnostic storage layer for event store and metadata store.</p><h3 id='docs' class='header-anchors'>docs</h3><p>Source code for <a href="http://predictionio.incubator.apache.org">http://predictionio.incubator.apache.org</a> site, and any other documentation support files.</p><h3 id='examples' class='header-anchors'>examples</h3><p>Complete code examples showing Apache PredictionIO (incubating)&#39;s application.</p><h3 id='sbt' class='header-anchors'>sbt</h3><p>Embedded SBT (Simple Build Tool) launcher.</p><h3 id='storage' class='header-anchors'>storage</h3><p>Storage implementations.</p><h3 id='tools' class='header-anchors'>tools</h3><p>Tools for runn
 ing Apache PredictionIO (incubating). Contains primarily the CLI (command-line interface) and its supporting code, and the experimental evaluation dashboard.</p></div></div></div></div><footer><div class="container"><div class="seperator"></div><div class="row"><div class="col-md-6 footer-link-column"><div class="footer-link-column-row"><h4>Community</h4><ul><li><a href="//predictionio.incubator.apache.org/install/" target="blank">Download</a></li><li><a href="//predictionio.incubator.apache.org/" target="blank">Docs</a></li><li><a href="//github.com/apache/incubator-predictionio" target="blank">GitHub</a></li><li><a href="mailto:user-subscribe@predictionio.incubator.apache.org" target="blank">Subscribe to User Mailing List</a></li><li><a href="//stackoverflow.com/questions/tagged/predictionio" target="blank">Stackoverflow</a></li></ul></div></div><div class="col-md-6 footer-link-column"><div class="footer-link-column-row"><h4>Contribute</h4><ul><li><a href="//predictionio.incubator
 .apache.org/community/contribute-code/" target="blank">Contribute</a></li><li><a href="//github.com/apache/incubator-predictionio" target="blank">Source Code</a></li><li><a href="//issues.apache.org/jira/browse/PIO" target="blank">Bug Tracker</a></li><li><a href="mailto:dev-subscribe@predictionio.incubator.apache.org" target="blank">Subscribe to Development Mailing List</a></li></ul></div></div></div><div class="row"><div class="col-md-12 footer-link-column"><a class="pull-right" href="http://incubator.apache.org/projects/predictionio.html"><img alt="Apache Incubator" src="/images/logos/apache_incubator-6954bd16.png"/></a><span>Apache PredictionIO is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Apache Incubator. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects.
  While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF.</span></div></div></div><div id="footer-bottom"><div class="container"><div class="row"><div class="col-md-12"><div id="footer-logo-wrapper"><img alt="PredictionIO" src="/images/logos/logo-white-d1e9c6e6.png"/></div><div id="social-icons-wrapper"><a class="github-button" href="https://github.com/apache/incubator-predictionio" data-style="mega" data-count-href="/apache/incubator-predictionio/stargazers" data-count-api="/repos/apache/incubator-predictionio#stargazers_count" data-count-aria-label="# stargazers on GitHub" aria-label="Star apache/incubator-predictionio on GitHub">Star</a> <a class="github-button" href="https://github.com/apache/incubator-predictionio/fork" data-icon="octicon-git-branch" data-style="mega" data-count-href="/apache/incubator-predictionio/network" data-count-api="/repos/apache/incuba
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