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From don...@apache.org
Subject [08/51] [abbrv] [partial] incubator-predictionio-site git commit: Documentation based on apache/incubator-predictionio#237e17acfbae7ca7eba43c61ce1c4f5498f980be
Date Sat, 08 Oct 2016 04:57:44 GMT
http://git-wip-us.apache.org/repos/asf/incubator-predictionio-site/blob/02715c51/templates/javaecommercerecommendation/quickstart/index.html
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+<!DOCTYPE html><html><head><title>Quick Start - E-Commerce Recommendation Engine Template (Java)</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="Quick Start - E-Commerce Recommendation Engine Template (Java)"/><link rel="canonical" href="https://docs.prediction.io/templates/javaecommercerecommendation/quickstart/"/><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-a2a2f408.css" rel="stylesheet" type="text/css"/><script src="//cdnjs.cloudf
 lare.com/ajax/libs/html5shiv/3.7.2/html5shiv.min.js"></script><script src="//cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script><script src="//use.typekit.net/pqo0itb.js"></script><script>try{Typekit.load({ async: true });}catch(e){}</script></head><body><div id="global"><header><div class="container" id="header-wrapper"><div class="row"><div class="col-sm-12"><div id="logo-wrapper"><span id="drawer-toggle"></span><a href="#"></a><a href="http://predictionio.incubator.apache.org/"><img alt="PredictionIO" id="logo" src="/images/logos/logo-ee2b9bb3.png"/></a></div><div id="menu-wrapper"><div id="pill-wrapper"><a class="pill left" href="/gallery/template-gallery">TEMPLATES</a> <a class="pill right" href="//github.com/apache/incubator-predictionio/">OPEN SOURCE</a></div></div><img class="mobile-search-bar-toggler hidden-md hidden-lg" src="/images/icons/search-glass-704bd4ff.png"/></div></div></div></header><div id="search-bar-row-wrapper"><div class="contai
 ner-fluid" id="search-bar-row"><div class="row"><div class="col-md-9 col-sm-11 col-xs-11"><div class="hidden-md hidden-lg" id="mobile-page-heading-wrapper"><p>PredictionIO Docs</p><h4>Quick Start - E-Commerce Recommendation Engine Template (Java)</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-tog
 gler 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>Cu
 stomizing 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 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="/cli/#engine-commands"><span>Engine Command-line Interface</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/"><span>Event Server Overview</span></a></li><li class="level-2"><a class="final" href="/cli/#event-server-commands"><span>Event Server Command-line Interface</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>Usin
 g 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="/algorithm/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="expandible" 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>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 cla
 ss="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" 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</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="/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></ul></nav></div><div class="col-md-9 col-sm-12"><div class="content-header hidden-md hidden-lg"><div id="page-title"><h1>Quick Start - E-Commerce Recommendation Engine Template (Java)</h1></div></div><div id="table-of-content-wrapper"><h5>On this page</h5><aside id="table-of-contents"><ul> <l
 i> <a href="#overview">Overview</a> </li> <li> <a href="#usage">Usage</a> </li> <li> <a href="#1-install-and-run-predictionio">1. Install and Run PredictionIO</a> </li> <li> <a href="#2-create-a-new-engine-from-an-engine-template">2. Create a new Engine from an Engine Template</a> </li> <li> <a href="#3-generate-an-app-id-and-access-key">3. Generate an App ID and Access Key</a> </li> <li> <a href="#4-collecting-data">4. Collecting Data</a> </li> <li> <a href="#5-deploy-the-engine-as-a-service">5. Deploy the Engine as a Service</a> </li> <li> <a href="#6-use-the-engine">6. Use the Engine</a> </li> <li> <a href="#setting-constraint-unavailableitems">Setting constraint "unavailableItems"</a> </li> <li> <a href="#advanced-query">Advanced Query</a> </li> </ul> </aside><hr/><a id="edit-page-link" href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/templates/javaecommercerecommendation/quickstart.html.md.erb"><img src="/images/icons/edit-pencil-d6c1bb3d.p
 ng"/>Edit this page</a></div><div class="content-header hidden-sm hidden-xs"><div id="page-title"><h1>Quick Start - E-Commerce Recommendation Engine Template (Java)</h1></div></div><div class="content"><h2 id='overview' class='header-anchors'>Overview</h2><p>This engine template provides personalized recommendation for e-commerce applications with the following features by default:</p> <ul> <li>Exclude out-of-stock items</li> <li>Provide recommendation to new users who sign up after the model is trained</li> <li>Recommend unseen items only (configurable)</li> <li>Recommend popular items if no information about the user is available</li> </ul> <div class="alert-message warning"><p>This template requires PredictionIO version &gt;= 0.9.3</p></div><h2 id='usage' class='header-anchors'>Usage</h2><h3 id='event-data-requirements' class='header-anchors'>Event Data Requirements</h3><p>By default, this template takes the following data from Event Server:</p> <ul> <li>Users&#39; <em>view</em> 
 events</li> <li>Users&#39; <em>buy</em> events</li> <li>Items with <em>categories</em> properties</li> <li>Constraint <em>unavailableItems</em> set events</li> </ul> <div class="alert-message info"><p>This template can easily be customized to consider more user events such as <em>rate</em> and <em>like</em>.</p></div><p>The <em>view</em> events are used as Training Data to train the model. The algorithm has a parameter <em>unseenOnly</em>; when this parameter is set to true, the engine would recommend unseen items only. You can specify a list of events which are considered as <em>seen</em> events with the algorithm parameter <em>seenItemEvents</em>. The default values are <em>view</em> and <em>buy</em> events, which means that the engine by default recommends un-viewed and un-bought items only. You can also define your own events which are considered as <em>seen</em>.</p><p>The constraint <em>unavailableItems</em> set events are used to exclude a list of unavailable items (such as o
 ut of stock) for all users in real time.</p><h3 id='input-query' class='header-anchors'>Input Query</h3> <ul> <li>User entity ID</li> <li>Number of items to be recommended</li> <li>List of whitelisted item categories (optional)</li> <li>List of whitelisted item entity IDs (optional)</li> <li>List of blacklisted item entity IDs (optional)</li> </ul> <p>This template also supports blacklist and whitelist. If a whitelist is provided, the engine will include only those products in the recommendation. Likewise, if a blacklist is provided, the engine will exclude those products in the recommendation.</p><h3 id='output-predictedresult' class='header-anchors'>Output PredictedResult</h3> <ul> <li>A ranked list of recommended item entity IDs</li> </ul> <h2 id='1.-install-and-run-predictionio' class='header-anchors'>1. Install and Run PredictionIO</h2><p>First you need to <a href="/install">install PredictionIO 0.10.0-incubating</a> (if you haven&#39;t done it).</p><p>Let&#39;s say you have in
 stalled PredictionIO at <code>/home/yourname/PredictionIO/</code>. For convenience, add PredictionIO&#39;s binary command path to your <code>PATH</code>, i.e. <code>/home/yourname/PredictionIO/bin</code>:</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><span class="gp">$ </span><span class="nv">PATH</span><span class="o">=</span><span class="nv">$PATH</span>:/home/yourname/PredictionIO/bin; <span class="nb">export </span>PATH
+</pre></td></tr></tbody></table> </div> <div class="alert-message note"><p>If you launched <strong>PredictionIO AWS instance</strong>, the path is located at <code>/opt/PredictionIO/bin</code>.</p></div><p>Once you have completed the installation process, please make sure all the components (PredictionIO Event Server, Elasticsearch, and HBase) are up and running.</p><div class="alert-message note"><p>If you launched <strong>PredictionIO AWS instance</strong>, you can skip <code>pio-start-all</code>. All components should have been started automatically.</p></div><p>If you are using PostgreSQL or MySQL, run the following to start PredictionIO Event Server:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="gp">$ </span>pio eventserver &amp;
+</pre></td></tr></tbody></table> </div> <p>If instead you are running HBase and Elasticsearch, run the following to start all PredictionIO Event Server, HBase, and Elasticsearch:</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><span class="gp">$ </span>pio-start-all
+</pre></td></tr></tbody></table> </div> <p>You can check the status by running:</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><span class="gp">$ </span>pio status
+</pre></td></tr></tbody></table> </div> <p>If everything is OK, you should see the following outputs:</p><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
+4</pre></td><td class="code"><pre>...
+
+<span class="o">(</span>sleeping 5 seconds <span class="k">for </span>all messages to show up...<span class="o">)</span>
+Your system is all ready to go.
+</pre></td></tr></tbody></table> </div> <div class="alert-message note"><p>To further troubleshoot, please see <a href="/resources/faq/#using-predictionio">FAQ - Using PredictionIO</a>.</p></div> <p><a href="#"></a></p> <h2 id='2.-create-a-new-engine-from-an-engine-template' class='header-anchors'>2. Create a new Engine from an Engine Template</h2><p>Now let&#39;s create a new engine called <em>MyECommerceRecommendation</em> by downloading the E-Commerce Recommendation Engine Template. Go to a directory where you want to put your engine and run the following:</p><div class="highlight shell"><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="gp">$ </span>pio template get PredictionIO/template-java-parallel-ecommercerecommendation MyECommerceRecommendation
+<span class="gp">$ </span><span class="nb">cd </span>MyECommerceRecommendation
+</pre></td></tr></tbody></table> </div> <p>A new directory <em>MyECommerceRecommendation</em> is created, where you can find the downloaded engine template.</p> <p><a href="#"></a></p> <h2 id='3.-generate-an-app-id-and-access-key' class='header-anchors'>3. Generate an App ID and Access Key</h2><p>You will need to create a new App in PredictionIO to store all the data of your app. The data collected will be used for machine learning modeling.</p><p>Let&#39;s assume you want to use this engine in an application named &quot;MyApp1&quot;. Run the following to create a new app &quot;MyApp1&quot;:</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><span class="gp">$ </span>pio app new MyApp1
+</pre></td></tr></tbody></table> </div> <p>You should find the following in the console output:</p><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
+4
+5
+6</pre></td><td class="code"><pre>...
+<span class="o">[</span>INFO] <span class="o">[</span>App<span class="nv">$]</span> Initialized Event Store <span class="k">for </span>this app ID: 1.
+<span class="o">[</span>INFO] <span class="o">[</span>App<span class="nv">$]</span> Created new app:
+<span class="o">[</span>INFO] <span class="o">[</span>App<span class="nv">$]</span>       Name: MyApp1
+<span class="o">[</span>INFO] <span class="o">[</span>App<span class="nv">$]</span>         ID: 1
+<span class="o">[</span>INFO] <span class="o">[</span>App<span class="nv">$]</span> Access Key: 3mZWDzci2D5YsqAnqNnXH9SB6Rg3dsTBs8iHkK6X2i54IQsIZI1eEeQQyMfs7b3F
+</pre></td></tr></tbody></table> </div> <p>Note that <em>App ID</em><em>, **Access Key</em>* are created for this App &quot;MyApp1&quot;. You will need the <strong>Access Key</strong> when you collect data with EventServer for this App.</p><p>You can list all of the apps created its corresponding ID and Access Key by running the following command:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="gp">$ </span>pio app list
+</pre></td></tr></tbody></table> </div> <p>You should see a list of apps created. For example:</p><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
+4</pre></td><td class="code"><pre><span class="o">[</span>INFO] <span class="o">[</span>App<span class="nv">$]</span>                 Name |   ID |                                                       Access Key | Allowed Event<span class="o">(</span>s<span class="o">)</span>
+<span class="o">[</span>INFO] <span class="o">[</span>App<span class="nv">$]</span>               MyApp1 |    1 | 3mZWDzci2D5YsqAnqNnXH9SB6Rg3dsTBs8iHkK6X2i54IQsIZI1eEeQQyMfs7b3F | <span class="o">(</span>all<span class="o">)</span>
+<span class="o">[</span>INFO] <span class="o">[</span>App<span class="nv">$]</span>               MyApp2 |    2 | io5lz6Eg4m3Xe4JZTBFE13GMAf1dhFl6ZteuJfrO84XpdOz9wRCrDU44EUaYuXq5 | <span class="o">(</span>all<span class="o">)</span>
+<span class="o">[</span>INFO] <span class="o">[</span>App<span class="nv">$]</span> Finished listing 2 app<span class="o">(</span>s<span class="o">)</span>.
+</pre></td></tr></tbody></table> </div> <p><a href="#"></a></p> <h2 id='4.-collecting-data' class='header-anchors'>4. Collecting Data</h2><p>Next, let&#39;s collect training data for this Engine. By default, the E-Commerce Recommendation Engine Template supports 2 types of entities and 2 events: <strong>user</strong> and <strong>item</strong>; events <strong>view</strong> and <strong>buy</strong>. An item has the <strong>categories</strong> property, which is a list of category names (String). A user can view and buy an item. The specical <strong>constraint</strong> entiy with entityId <strong>unavailableItems</strong> defines a list of unavailable items and is taken into account in realtime during serving.</p><p>In summary, this template requires &#39;$set&#39; user event, &#39;$set&#39; item event, user-view-item events, user-buy-item event and &#39;$set&#39; constraint event.</p><div class="alert-message info"><p>This template can easily be customized to consider other user-to-it
 em events.</p></div><p>You can send these events to PredictionIO Event Server in real-time easily by making a HTTP request or through the provided SDK. Please see <a href="/appintegration/">App Integration Overview</a> for more details how to integrate your app with SDK.</p><p>Let&#39;s try sending events to EventServer with the following <code>curl</code> commands (The corresponding SDK code is showed in other tabs).</p><p>Replace <code>&lt;ACCCESS_KEY&gt;</code> by the Access Key generated in above steps. Note that <code>localhost:7070</code> is the default URL of the Event Server.</p><p>For convenience, set your access key to the shell variable, run:</p><p><code>$ ACCESS_KEY=&lt;ACCESS_KEY&gt;</code></p> <p><a href="#"></a></p> <p>For example, when a new user with id &quot;u0&quot; is created in your app on time <code>2014-11-02T09:39:45.618-08:00</code> (current time will be used if eventTime is not specified), you can send a <code>$set</code> event for this user. To send this e
 vent, run the following <code>curl</code> command:</p><div class="tabs"> <ul class="control"> <li data-lang="json"><a href="#tab-04089308-4a31-4fe9-bd13-befa92c1518b">REST API</a></li> <li data-lang="python"><a href="#tab-df72a762-da3d-402a-9fa0-4417a20e0584">Python SDK</a></li> <li data-lang="php"><a href="#tab-7d22f973-3874-47bf-9b02-24b4d7672f45">PHP SDK</a></li> <li data-lang="ruby"><a href="#tab-4dc97fc8-5f14-4a46-82ec-a25dda5473f7">Ruby SDK</a></li> <li data-lang="java"><a href="#tab-308024fc-a943-45bc-b00d-e777dfa360ca">Java SDK</a></li> </ul> <div data-tab="REST API" data-lang="json" id="tab-04089308-4a31-4fe9-bd13-befa92c1518b"> <div class="highlight shell"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8</pre></td> <td class="code"><pre><span class="gp">$ </span>curl -i -X POST http://localhost:7070/events.json?accessKey<span class="o">=</span><span class="nv">$ACCESS_KEY</span> <span class="se">\</span>
+-H <span class="s2">"Content-Type: application/json"</span> <span class="se">\</span>
+-d <span class="s1">'{
+  "event" : "$set",
+  "entityType" : "user",
+  "entityId" : "u0",
+  "eventTime" : "2014-11-02T09:39:45.618-08:00"
+}'</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Python SDK" data-lang="python" id="tab-df72a762-da3d-402a-9fa0-4417a20e0584"> <div class="highlight python"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+12
+13
+14
+15
+16</pre></td> <td class="code"><pre><span class="kn">import</span> <span class="nn">predictionio</span>
+
+<span class="n">client</span> <span class="o">=</span> <span class="n">predictionio</span><span class="o">.</span><span class="n">EventClient</span><span class="p">(</span>
+  <span class="n">access_key</span><span class="o">=&lt;</span><span class="n">ACCESS</span> <span class="n">KEY</span><span class="o">&gt;</span><span class="p">,</span>
+  <span class="n">url</span><span class="o">=&lt;</span><span class="n">URL</span> <span class="n">OF</span> <span class="n">EVENTSERVER</span><span class="o">&gt;</span><span class="p">,</span>
+  <span class="n">threads</span><span class="o">=</span><span class="mi">5</span><span class="p">,</span>
+  <span class="n">qsize</span><span class="o">=</span><span class="mi">500</span>
+<span class="p">)</span>
+
+<span class="c"># Create a new user</span>
+
+<span class="n">client</span><span class="o">.</span><span class="n">create_event</span><span class="p">(</span>
+  <span class="n">event</span><span class="o">=</span><span class="s">"$set"</span><span class="p">,</span>
+  <span class="n">entity_type</span><span class="o">=</span><span class="s">"user"</span><span class="p">,</span>
+  <span class="n">entity_id</span><span class="o">=&lt;</span><span class="n">USER_ID</span><span class="o">&gt;</span>
+<span class="p">)</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="PHP SDK" data-lang="php" id="tab-7d22f973-3874-47bf-9b02-24b4d7672f45"> <div class="highlight php"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+12
+13
+14
+15
+16
+17
+18
+19
+20
+21</pre></td> <td class="code"><pre><span class="cp">&lt;?php</span>
+<span class="k">require_once</span><span class="p">(</span><span class="s2">"vendor/autoload.php"</span><span class="p">);</span>
+<span class="k">use</span> <span class="nx">predictionio\EventClient</span><span class="p">;</span>
+
+<span class="nv">$client</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EventClient</span><span class="p">(</span><span class="o">&lt;</span><span class="nx">ACCESS</span> <span class="nx">KEY</span><span class="o">&gt;</span><span class="p">,</span> <span class="o">&lt;</span><span class="nx">URL</span> <span class="nx">OF</span> <span class="nx">EVENTSERVER</span><span class="o">&gt;</span><span class="p">);</span>
+
+<span class="c1">// Create a new user
+</span><span class="nv">$client</span><span class="o">-&gt;</span><span class="na">createEvent</span><span class="p">(</span><span class="k">array</span><span class="p">(</span>
+  <span class="s1">'event'</span> <span class="o">=&gt;</span> <span class="s1">'$set'</span><span class="p">,</span>
+  <span class="s1">'entityType'</span> <span class="o">=&gt;</span> <span class="s1">'user'</span><span class="p">,</span>
+  <span class="s1">'entityId'</span> <span class="o">=&gt;</span> <span class="o">&lt;</span><span class="nx">USER</span> <span class="nx">ID</span><span class="o">&gt;</span>
+<span class="p">));</span>
+
+<span class="c1">// Create a new item or set existing item's categories
+</span><span class="nv">$client</span><span class="o">-&gt;</span><span class="na">createEvent</span><span class="p">(</span><span class="k">array</span><span class="p">(</span>
+  <span class="s1">'event'</span> <span class="o">=&gt;</span> <span class="s1">'$set'</span><span class="p">,</span>
+  <span class="s1">'entityType'</span> <span class="o">=&gt;</span> <span class="s1">'item'</span><span class="p">,</span>
+  <span class="s1">'entityId'</span> <span class="o">=&gt;</span> <span class="o">&lt;</span><span class="nx">ITEM</span> <span class="nx">ID</span><span class="o">&gt;</span>
+  <span class="s1">'properties'</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">'categories'</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">'&lt;CATEGORY_1&gt;'</span><span class="p">,</span> <span class="s1">'&lt;CATEGORY_2&gt;'</span><span class="p">))</span>
+<span class="p">));</span>
+<span class="cp">?&gt;</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Ruby SDK" data-lang="ruby" id="tab-4dc97fc8-5f14-4a46-82ec-a25dda5473f7"> <div class="highlight ruby"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9</pre></td> <td class="code"><pre><span class="c1"># Create a client object.</span>
+<span class="n">client</span> <span class="o">=</span> <span class="no">PredictionIO</span><span class="o">::</span><span class="no">EventClient</span><span class="p">.</span><span class="nf">new</span><span class="p">(</span><span class="o">&lt;</span><span class="no">ACCESS</span> <span class="no">KEY</span><span class="o">&gt;</span><span class="p">,</span> <span class="o">&lt;</span><span class="no">URL</span> <span class="no">OF</span> <span class="no">EVENTSERVER</span><span class="o">&gt;</span><span class="p">)</span>
+
+<span class="c1"># Create a new user</span>
+<span class="n">client</span><span class="p">.</span><span class="nf">create_event</span><span class="p">(</span>
+  <span class="s1">'$set'</span><span class="p">,</span>
+  <span class="s1">'user'</span><span class="p">,</span>
+  <span class="o">&lt;</span><span class="no">USER</span> <span class="no">ID</span><span class="o">&gt;</span>
+<span class="p">)</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Java SDK" data-lang="java" id="tab-308024fc-a943-45bc-b00d-e777dfa360ca"> <div class="highlight java"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+12
+13</pre></td> <td class="code"><pre><span class="kn">import</span> <span class="nn">org.apache.predictionio.Event</span><span class="o">;</span>
+<span class="kn">import</span> <span class="nn">org.apache.predictionio.EventClient</span><span class="o">;</span>
+
+<span class="kn">import</span> <span class="nn">com.google.common.collect.ImmutableList</span><span class="o">;</span>
+
+<span class="n">EventClient</span> <span class="n">client</span> <span class="o">=</span> <span class="k">new</span> <span class="n">EventClient</span><span class="o">(&lt;</span><span class="n">ACCESS</span> <span class="n">KEY</span><span class="o">&gt;,</span> <span class="o">&lt;</span><span class="n">URL</span> <span class="n">OF</span> <span class="n">EVENTSERVER</span><span class="o">&gt;);</span>
+
+<span class="c1">// Create a new user</span>
+<span class="n">Event</span> <span class="n">userEvent</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Event</span><span class="o">()</span>
+  <span class="o">.</span><span class="na">event</span><span class="o">(</span><span class="s">"$set"</span><span class="o">)</span>
+  <span class="o">.</span><span class="na">entityType</span><span class="o">(</span><span class="s">"user"</span><span class="o">)</span>
+  <span class="o">.</span><span class="na">entityId</span><span class="o">(&lt;</span><span class="n">USER_ID</span><span class="o">&gt;);</span>
+<span class="n">client</span><span class="o">.</span><span class="na">createEvent</span><span class="o">(</span><span class="n">userEvent</span><span class="o">);</span>
+</pre></td> </tr></tbody></table> </div> </div> </div> <p>When a new item &quot;i0&quot; is created in your app on time <code>2014-11-02T09:39:45.618-08:00</code> (current time will be used if eventTime is not specified), you can send a <code>$set</code> event for the item. Note that the item is set with categories properties: <code>&quot;c1&quot;</code> and <code>&quot;c2&quot;</code>. Run the following <code>curl</code> command:</p><div class="tabs"> <ul class="control"> <li data-lang="json"><a href="#tab-1cfd5690-d420-4f5a-b751-1c1b6c934f97">REST API</a></li> <li data-lang="python"><a href="#tab-45c9396c-bc2a-453b-a901-3ed109e1ec2c">Python SDK</a></li> <li data-lang="php"><a href="#tab-09a87283-24a3-4813-b75f-2ce44bc08c22">PHP SDK</a></li> <li data-lang="ruby"><a href="#tab-ee77e586-bb1e-46db-90ac-5c32ff4af1b6">Ruby SDK</a></li> <li data-lang="java"><a href="#tab-74b64107-f41a-40e1-9add-9c75f6fda165">Java SDK</a></li> </ul> <div data-tab="REST API" data-lang="json" id="tab-1cfd56
 90-d420-4f5a-b751-1c1b6c934f97"> <div class="highlight shell"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11</pre></td> <td class="code"><pre><span class="gp">$ </span>curl -i -X POST http://localhost:7070/events.json?accessKey<span class="o">=</span><span class="nv">$ACCESS_KEY</span> <span class="se">\</span>
+-H <span class="s2">"Content-Type: application/json"</span> <span class="se">\</span>
+-d <span class="s1">'{
+  "event" : "$set",
+  "entityType" : "item",
+  "entityId" : "i0",
+  "properties" : {
+    "categories" : ["c1", "c2"]
+  }
+  "eventTime" : "2014-11-02T09:39:45.618-08:00"
+}'</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Python SDK" data-lang="python" id="tab-45c9396c-bc2a-453b-a901-3ed109e1ec2c"> <div class="highlight python"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10</pre></td> <td class="code"><pre><span class="c"># Create a new item or set existing item's categories</span>
+
+<span class="n">client</span><span class="o">.</span><span class="n">create_event</span><span class="p">(</span>
+  <span class="n">event</span><span class="o">=</span><span class="s">"$set"</span><span class="p">,</span>
+  <span class="n">entity_type</span><span class="o">=</span><span class="s">"item"</span><span class="p">,</span>
+  <span class="n">entity_id</span><span class="o">=</span><span class="n">item_id</span><span class="p">,</span>
+  <span class="n">properties</span><span class="o">=</span><span class="p">{</span>
+    <span class="s">"categories"</span> <span class="p">:</span> <span class="p">[</span><span class="s">"&lt;CATEGORY_1&gt;"</span><span class="p">,</span> <span class="s">"&lt;CATEGORY_2&gt;"</span><span class="p">]</span>
+  <span class="p">}</span>
+<span class="p">)</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="PHP SDK" data-lang="php" id="tab-09a87283-24a3-4813-b75f-2ce44bc08c22"> <div class="highlight php"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9</pre></td> <td class="code"><pre><span class="cp">&lt;?php</span>
+<span class="c1">// Create a new item or set existing item's categories
+</span><span class="nv">$client</span><span class="o">-&gt;</span><span class="na">createEvent</span><span class="p">(</span><span class="k">array</span><span class="p">(</span>
+  <span class="s1">'event'</span> <span class="o">=&gt;</span> <span class="s1">'$set'</span><span class="p">,</span>
+  <span class="s1">'entityType'</span> <span class="o">=&gt;</span> <span class="s1">'item'</span><span class="p">,</span>
+  <span class="s1">'entityId'</span> <span class="o">=&gt;</span> <span class="o">&lt;</span><span class="nx">ITEM</span> <span class="nx">ID</span><span class="o">&gt;</span>
+  <span class="s1">'properties'</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">'categories'</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">'&lt;CATEGORY_1&gt;'</span><span class="p">,</span> <span class="s1">'&lt;CATEGORY_2&gt;'</span><span class="p">))</span>
+<span class="p">));</span>
+<span class="cp">?&gt;</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Ruby SDK" data-lang="ruby" id="tab-ee77e586-bb1e-46db-90ac-5c32ff4af1b6"> <div class="highlight ruby"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9</pre></td> <td class="code"><pre><span class="c1"># Create a new item or set existing item's categories</span>
+<span class="n">client</span><span class="p">.</span><span class="nf">create_event</span><span class="p">(</span>
+  <span class="s1">'$set'</span><span class="p">,</span>
+  <span class="s1">'item'</span><span class="p">,</span>
+  <span class="o">&lt;</span><span class="no">ITEM</span> <span class="no">ID</span><span class="o">&gt;</span><span class="p">,</span> <span class="p">{</span>
+    <span class="s1">'properties'</span> <span class="o">=&gt;</span> <span class="p">{</span> <span class="s1">'categories'</span> <span class="o">=&gt;</span> <span class="p">[</span><span class="s1">'&lt;CATEGORY_1&gt;'</span><span class="p">,</span> <span class="s1">'&lt;CATEGORY_2&gt;'</span><span class="p">]</span> <span class="p">}</span>
+  <span class="p">}</span>
+<span class="p">)</span>
+
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Java SDK" data-lang="java" id="tab-74b64107-f41a-40e1-9add-9c75f6fda165"> <div class="highlight java"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7</pre></td> <td class="code"><pre><span class="c1">// Create a new item or set existing item's categories</span>
+<span class="n">Event</span> <span class="n">itemEvent</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Event</span><span class="o">()</span>
+  <span class="o">.</span><span class="na">event</span><span class="o">(</span><span class="s">"$set"</span><span class="o">)</span>
+  <span class="o">.</span><span class="na">entityType</span><span class="o">(</span><span class="s">"item"</span><span class="o">)</span>
+  <span class="o">.</span><span class="na">entityId</span><span class="o">(&lt;</span><span class="n">ITEM_ID</span><span class="o">&gt;)</span>
+  <span class="o">.</span><span class="na">property</span><span class="o">(</span><span class="s">"categories"</span><span class="o">,</span> <span class="n">ImmutableList</span><span class="o">.</span><span class="na">of</span><span class="o">(</span><span class="s">"&lt;CATEGORY_1&gt;"</span><span class="o">,</span> <span class="s">"&lt;CATEGORY_2&gt;"</span><span class="o">));</span>
+<span class="n">client</span><span class="o">.</span><span class="na">createEvent</span><span class="o">(</span><span class="n">itemEvent</span><span class="o">)</span>
+</pre></td> </tr></tbody></table> </div> </div> </div> <p>The properties of the <code>user</code> and <code>item</code> can be set, unset, or delete by special events <strong>$set</strong>, <strong>$unset</strong> and <strong>$delete</strong>. Please refer to <a href="/datacollection/eventapi/#note-about-properties">Event API</a> for more details of using these events.</p><p>When the user &quot;u0&quot; view item &quot;i0&quot; on time <code>2014-11-10T12:34:56.123-08:00</code> (current time will be used if eventTime is not specified), you can send a view event. Run the following <code>curl</code> command:</p><div class="tabs"> <ul class="control"> <li data-lang="json"><a href="#tab-fb43715d-5751-4e31-a36d-4c3c0c4f14da">REST API</a></li> <li data-lang="python"><a href="#tab-a88c6018-d805-47fb-83c5-3e36bdbd2496">Python SDK</a></li> <li data-lang="php"><a href="#tab-70c92c0a-e4f7-47af-8508-82152fd9e8d2">PHP SDK</a></li> <li data-lang="ruby"><a href="#tab-ecaf1477-6c3b-48e8-8c11-4400b3
 65bbb7">Ruby SDK</a></li> <li data-lang="java"><a href="#tab-a9193487-0a94-4015-b144-582891ac234f">Java SDK</a></li> </ul> <div data-tab="REST API" data-lang="json" id="tab-fb43715d-5751-4e31-a36d-4c3c0c4f14da"> <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
+4
+5
+6
+7
+8
+9
+10</pre></td> <td class="code"><pre><span class="gp">$ </span>curl -i -X POST http://localhost:7070/events.json?accessKey<span class="o">=</span><span class="nv">$ACCESS_KEY</span> <span class="se">\</span>
+-H <span class="s2">"Content-Type: application/json"</span> <span class="se">\</span>
+-d <span class="s1">'{
+  "event" : "view",
+  "entityType" : "user",
+  "entityId" : "u0",
+  "targetEntityType" : "item",
+  "targetEntityId" : "i0",
+  "eventTime" : "2014-11-10T12:34:56.123-08:00"
+}'</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Python SDK" data-lang="python" id="tab-a88c6018-d805-47fb-83c5-3e36bdbd2496"> <div class="highlight python"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9</pre></td> <td class="code"><pre><span class="c"># A user views an item</span>
+
+<span class="n">client</span><span class="o">.</span><span class="n">create_event</span><span class="p">(</span>
+  <span class="n">event</span><span class="o">=</span><span class="s">"view"</span><span class="p">,</span>
+  <span class="n">entity_type</span><span class="o">=</span><span class="s">"user"</span><span class="p">,</span>
+  <span class="n">entity_id</span><span class="o">=&lt;</span><span class="n">USER</span> <span class="n">ID</span><span class="o">&gt;</span><span class="p">,</span>
+  <span class="n">target_entity_type</span><span class="o">=</span><span class="s">"item"</span><span class="p">,</span>
+  <span class="n">target_entity_id</span><span class="o">=&lt;</span><span class="n">ITEM</span> <span class="n">ID</span><span class="o">&gt;</span>
+<span class="p">)</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="PHP SDK" data-lang="php" id="tab-70c92c0a-e4f7-47af-8508-82152fd9e8d2"> <div class="highlight php"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10</pre></td> <td class="code"><pre><span class="cp">&lt;?php</span>
+<span class="c1">// A user views an item
+</span><span class="nv">$client</span><span class="o">-&gt;</span><span class="na">createEvent</span><span class="p">(</span><span class="k">array</span><span class="p">(</span>
+   <span class="s1">'event'</span> <span class="o">=&gt;</span> <span class="s1">'view'</span><span class="p">,</span>
+   <span class="s1">'entityType'</span> <span class="o">=&gt;</span> <span class="s1">'user'</span><span class="p">,</span>
+   <span class="s1">'entityId'</span> <span class="o">=&gt;</span> <span class="o">&lt;</span><span class="nx">USER</span> <span class="nx">ID</span><span class="o">&gt;</span><span class="p">,</span>
+   <span class="s1">'targetEntityType'</span> <span class="o">=&gt;</span> <span class="s1">'item'</span><span class="p">,</span>
+   <span class="s1">'targetEntityId'</span> <span class="o">=&gt;</span> <span class="o">&lt;</span><span class="nx">ITEM</span> <span class="nx">ID</span><span class="o">&gt;</span>
+<span class="p">));</span>
+<span class="cp">?&gt;</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Ruby SDK" data-lang="ruby" id="tab-ecaf1477-6c3b-48e8-8c11-4400b365bbb7"> <div class="highlight ruby"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10</pre></td> <td class="code"><pre><span class="c1"># A user views an item.</span>
+<span class="n">client</span><span class="p">.</span><span class="nf">create_event</span><span class="p">(</span>
+  <span class="s1">'view'</span><span class="p">,</span>
+  <span class="s1">'user'</span><span class="p">,</span>
+  <span class="o">&lt;</span><span class="no">USER</span> <span class="no">ID</span><span class="o">&gt;</span><span class="p">,</span> <span class="p">{</span>
+    <span class="s1">'targetEntityType'</span> <span class="o">=&gt;</span> <span class="s1">'item'</span><span class="p">,</span>
+    <span class="s1">'targetEntityId'</span> <span class="o">=&gt;</span> <span class="o">&lt;</span><span class="no">ITEM</span> <span class="no">ID</span><span class="o">&gt;</span>
+  <span class="p">}</span>
+<span class="p">)</span>
+
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Java SDK" data-lang="java" id="tab-a9193487-0a94-4015-b144-582891ac234f"> <div class="highlight java"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8</pre></td> <td class="code"><pre><span class="c1">// A user views an item</span>
+<span class="n">Event</span> <span class="n">viewEvent</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Event</span><span class="o">()</span>
+    <span class="o">.</span><span class="na">event</span><span class="o">(</span><span class="s">"view"</span><span class="o">)</span>
+    <span class="o">.</span><span class="na">entityType</span><span class="o">(</span><span class="s">"user"</span><span class="o">)</span>
+    <span class="o">.</span><span class="na">entityId</span><span class="o">(&lt;</span><span class="n">USER_ID</span><span class="o">&gt;)</span>
+    <span class="o">.</span><span class="na">targetEntityType</span><span class="o">(</span><span class="s">"item"</span><span class="o">)</span>
+    <span class="o">.</span><span class="na">targetEntityId</span><span class="o">(&lt;</span><span class="n">ITEM_ID</span><span class="o">&gt;);</span>
+<span class="n">client</span><span class="o">.</span><span class="na">createEvent</span><span class="o">(</span><span class="n">viewEvent</span><span class="o">);</span>
+</pre></td> </tr></tbody></table> </div> </div> </div> <p>When the user &quot;u0&quot; buy item &quot;i0&quot; on time <code>2014-11-10T13:00:00.123-08:00</code> (current time will be used if eventTime is not specified), you can send a view event. Run the following <code>curl</code> command:</p><div class="tabs"> <ul class="control"> <li data-lang="json"><a href="#tab-0f4b7c6b-6179-491d-b9a3-7d7c6494005d">REST API</a></li> <li data-lang="python"><a href="#tab-9b9a9f6c-f438-46f3-b004-858885930174">Python SDK</a></li> <li data-lang="php"><a href="#tab-049de206-f27d-45c1-bbff-f2cde511ea23">PHP SDK</a></li> <li data-lang="ruby"><a href="#tab-f058dd9d-eb96-4c0f-8aa2-49058de56234">Ruby SDK</a></li> <li data-lang="java"><a href="#tab-bff14dd5-ba0c-4ed5-b871-b82679e8c436">Java SDK</a></li> </ul> <div data-tab="REST API" data-lang="json" id="tab-0f4b7c6b-6179-491d-b9a3-7d7c6494005d"> <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
+4
+5
+6
+7
+8
+9
+10</pre></td> <td class="code"><pre><span class="gp">$ </span>curl -i -X POST http://localhost:7070/events.json?accessKey<span class="o">=</span><span class="nv">$ACCESS_KEY</span> <span class="se">\</span>
+-H <span class="s2">"Content-Type: application/json"</span> <span class="se">\</span>
+-d <span class="s1">'{
+  "event" : "buy",
+  "entityType" : "user",
+  "entityId" : "u0",
+  "targetEntityType" : "item",
+  "targetEntityId" : "i0",
+  "eventTime" : "2014-11-10T13:00:00.123-08:00"
+}'</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Python SDK" data-lang="python" id="tab-9b9a9f6c-f438-46f3-b004-858885930174"> <div class="highlight python"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9</pre></td> <td class="code"><pre><span class="c"># A user buys an item</span>
+
+<span class="n">client</span><span class="o">.</span><span class="n">create_event</span><span class="p">(</span>
+  <span class="n">event</span><span class="o">=</span><span class="s">"buy"</span><span class="p">,</span>
+  <span class="n">entity_type</span><span class="o">=</span><span class="s">"user"</span><span class="p">,</span>
+  <span class="n">entity_id</span><span class="o">=&lt;</span><span class="n">USER</span> <span class="n">ID</span><span class="o">&gt;</span><span class="p">,</span>
+  <span class="n">target_entity_type</span><span class="o">=</span><span class="s">"item"</span><span class="p">,</span>
+  <span class="n">target_entity_id</span><span class="o">=&lt;</span><span class="n">ITEM</span> <span class="n">ID</span><span class="o">&gt;</span>
+<span class="p">)</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="PHP SDK" data-lang="php" id="tab-049de206-f27d-45c1-bbff-f2cde511ea23"> <div class="highlight php"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10</pre></td> <td class="code"><pre><span class="cp">&lt;?php</span>
+<span class="c1">// A user buys an item
+</span><span class="nv">$client</span><span class="o">-&gt;</span><span class="na">createEvent</span><span class="p">(</span><span class="k">array</span><span class="p">(</span>
+   <span class="s1">'event'</span> <span class="o">=&gt;</span> <span class="s1">'buy'</span><span class="p">,</span>
+   <span class="s1">'entityType'</span> <span class="o">=&gt;</span> <span class="s1">'user'</span><span class="p">,</span>
+   <span class="s1">'entityId'</span> <span class="o">=&gt;</span> <span class="o">&lt;</span><span class="nx">USER</span> <span class="nx">ID</span><span class="o">&gt;</span><span class="p">,</span>
+   <span class="s1">'targetEntityType'</span> <span class="o">=&gt;</span> <span class="s1">'item'</span><span class="p">,</span>
+   <span class="s1">'targetEntityId'</span> <span class="o">=&gt;</span> <span class="o">&lt;</span><span class="nx">ITEM</span> <span class="nx">ID</span><span class="o">&gt;</span>
+<span class="p">));</span>
+<span class="cp">?&gt;</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Ruby SDK" data-lang="ruby" id="tab-f058dd9d-eb96-4c0f-8aa2-49058de56234"> <div class="highlight ruby"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9</pre></td> <td class="code"><pre><span class="c1"># A user buys an item.</span>
+<span class="n">client</span><span class="p">.</span><span class="nf">create_event</span><span class="p">(</span>
+  <span class="s1">'buy'</span><span class="p">,</span>
+  <span class="s1">'user'</span><span class="p">,</span>
+  <span class="o">&lt;</span><span class="no">USER</span> <span class="no">ID</span><span class="o">&gt;</span><span class="p">,</span> <span class="p">{</span>
+    <span class="s1">'targetEntityType'</span> <span class="o">=&gt;</span> <span class="s1">'item'</span><span class="p">,</span>
+    <span class="s1">'targetEntityId'</span> <span class="o">=&gt;</span> <span class="o">&lt;</span><span class="no">ITEM</span> <span class="no">ID</span><span class="o">&gt;</span>
+  <span class="p">}</span>
+<span class="p">)</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Java SDK" data-lang="java" id="tab-bff14dd5-ba0c-4ed5-b871-b82679e8c436"> <div class="highlight java"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8</pre></td> <td class="code"><pre><span class="c1">// A user buys an item</span>
+<span class="n">Event</span> <span class="n">viewEvent</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Event</span><span class="o">()</span>
+    <span class="o">.</span><span class="na">event</span><span class="o">(</span><span class="s">"buy"</span><span class="o">)</span>
+    <span class="o">.</span><span class="na">entityType</span><span class="o">(</span><span class="s">"user"</span><span class="o">)</span>
+    <span class="o">.</span><span class="na">entityId</span><span class="o">(&lt;</span><span class="n">USER_ID</span><span class="o">&gt;)</span>
+    <span class="o">.</span><span class="na">targetEntityType</span><span class="o">(</span><span class="s">"item"</span><span class="o">)</span>
+    <span class="o">.</span><span class="na">targetEntityId</span><span class="o">(&lt;</span><span class="n">ITEM_ID</span><span class="o">&gt;);</span>
+<span class="n">client</span><span class="o">.</span><span class="na">createEvent</span><span class="o">(</span><span class="n">viewEvent</span><span class="o">);</span>
+</pre></td> </tr></tbody></table> </div> </div> </div> <p><h3 id='query-event-server' class='header-anchors'>Query Event Server</h3><p>Now let&#39;s query the EventServer and see if these events are imported successfully.</p><p>Go to following URL with your browser:</p><p><code><a href="http://localhost:7070/events.json?accessKey=&amp;lt;YOUR_ACCESS_KEY">http://localhost:7070/events.json?accessKey=&amp;lt;YOUR_ACCESS_KEY</a>&gt;</code></p><p>or run the following command in terminal:</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><span class="gp">$ </span>curl -i -X GET <span class="s2">&quot;<a href="http://localhost:7070/events.json?accessKey=">http://localhost:7070/events.json?accessKey=</a></span><span class="nv">$ACCESS_KEY</span><span class="s2">&quot;</span>
+</pre></td></tr></tbody></table> </div> <div class="alert-message note"><p>Note that you should quote the entire URL by using single or double quotes when you run the <code>curl</code> command.</p></div><p>It should return the imported events in JSON format. You can refer to <a href="/datacollection/eventapi/#debugging-recipes">Event Server Debugging Recipes</a> for more different ways to query Event Server.</p></p><h3 id='import-more-sample-data' class='header-anchors'>Import More Sample Data</h3><p>This engine requires more data in order to train a useful model. Instead of sending more events one by one in real time, for quickstart demonstration purpose, we are going to use a script to import more events in batch.</p> <p>A Python import script <code>import_eventserver.py</code> is provided to import sample data. It imports 10 users (with user ID &quot;u1&quot; to &quot;u10&quot;) and 50 items (with item ID &quot;i1&quot; to &quot;i50&quot;) with some random assigned categories ( w
 ith categories &quot;c1&quot; to &quot;c6&quot;). Each user then randomly view 10 items.</p><p>First, you will need to install Python SDK in order to run the sample data import script. To install Python SDK, run:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="gp">$ </span>pip install predictionio
+</pre></td></tr></tbody></table> </div> <p>or</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><span class="gp">$ </span>easy_install predictionio
+</pre></td></tr></tbody></table> </div> <div class="alert-message note"><p>You may need <code>sudo</code> access if you have permission issue. (ie. <code>sudo pip install predictionio</code>)</p></div> <p><a href="#"></a></p> <p>Make sure you are under the <code>MyECommerceRecommendation</code> directory. Execute the following to import the data (Replace the value of access_key parameter with your <strong>Access Key</strong>):</p><div class="highlight shell"><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="gp">$ </span><span class="nb">cd </span>MyECommerceRecommendation
+<span class="gp">$ </span>python data/import_eventserver.py --access_key 3mZWDzci2D5YsqAnqNnXH9SB6Rg3dsTBs8iHkK6X2i54IQsIZI1eEeQQyMfs7b3F
+</pre></td></tr></tbody></table> </div> <p>You should see the following output:</p><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
+4
+5
+6
+7
+8
+9</pre></td><td class="code"><pre>...
+User u10 buys item i14
+User u10 views item i46
+User u10 buys item i46
+User u10 views item i30
+User u10 buys item i30
+User u10 views item i40
+User u10 buys item i40
+204 events are imported.
+</pre></td></tr></tbody></table> </div> <p><a href="#"></a></p><div class="alert-message warning"><p>If you see error <strong>TypeError: <strong>init</strong>() got an unexpected keyword argument &#39;access_key&#39;</strong>, please update the Python SDK to the latest version.</p></div><p>You can query the event server again as described previously to check the imported events.</p> <h2 id='5.-deploy-the-engine-as-a-service' class='header-anchors'>5. Deploy the Engine as a Service</h2><p>Now you can build, train, and deploy the engine. First, make sure you are under the <code>MyECommerceRecommendation</code> directory.</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><span class="gp">$ </span><span class="nb">cd </span>MyECommerceRecommendation
+</pre></td></tr></tbody></table> </div> <h3 id='engine.json' class='header-anchors'>Engine.json</h3><p>Under the directory, you should find an <code>engine.json</code> file; this is where you specify parameters for the engine.</p><div class="alert-message warning"><p>Modify this file to make sure the <code>appName</code> parameter match your <strong>App Name</strong> you created earlier (e.g. &quot;MyApp1&quot; if you follow the quickstart).</p></div><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
+4
+5
+6
+7</pre></td><td class="code"><pre>  ...
+  <span class="s2">"datasource"</span>: <span class="o">{</span>
+    <span class="s2">"params"</span> : <span class="o">{</span>
+      <span class="s2">"appName"</span>: <span class="s2">"MyApp1"</span>
+    <span class="o">}</span>
+  <span class="o">}</span>,
+  ...
+</pre></td></tr></tbody></table> </div> <div class="alert-message note"><p>You may see <code>appId</code> in engine.json instead, which means you are using old template. In this case, make sure the <code>appId</code> defined in the file match your <strong>App ID</strong>. Alternatively, you can download the latest version of the template or follow our <a href="/resources/upgrade/#upgrade-to-0.9.2">upgrade instructions</a> to modify the template to use <code>appName</code> as parameter.</p></div> <p><a href="#"></a></p> <div class="alert-message warning"><p>Note that the &quot;algorithms&quot; also has <code>appName</code> parameter which you need to modify to match your <strong>App Name</strong> as well:</p></div><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
+4
+5
+6
+7
+8
+9
+10
+11</pre></td><td class="code"><pre>  ...
+  <span class="s2">"algorithms"</span>: <span class="o">[</span>
+    <span class="o">{</span>
+      <span class="s2">"name"</span>: <span class="s2">"als"</span>,
+      <span class="s2">"params"</span>: <span class="o">{</span>
+        <span class="s2">"appName"</span>: <span class="s2">"MyApp1"</span>,
+        ...
+      <span class="o">}</span>
+    <span class="o">}</span>
+  <span class="o">]</span>
+  ...
+</pre></td></tr></tbody></table> </div> <p><h3 id='building' class='header-anchors'>Building</h3><p>Start with building your <em>MyECommerceRecommendation</em> engine. Run the following command:</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><span class="gp">$ </span>pio build --verbose
+</pre></td></tr></tbody></table> </div> <p>This command should take few minutes for the first time; all subsequent builds should be less than a minute. You can also run it without <code>--verbose</code> if you don&#39;t want to see all the log messages.</p><p>Upon successful build, you should see a console message similar to the following.</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><span class="o">[</span>INFO] <span class="o">[</span>Console<span class="nv">$]</span> Your engine is ready <span class="k">for </span>training.
+</pre></td></tr></tbody></table> </div> <h3 id='training-the-predictive-model' class='header-anchors'>Training the Predictive Model</h3><p>To train your engine, run the following command:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="gp">$ </span>pio train
+</pre></td></tr></tbody></table> </div> <p>When your engine is trained successfully, you should see a console message similar to the following.</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><span class="o">[</span>INFO] <span class="o">[</span>CoreWorkflow<span class="nv">$]</span> Training completed successfully.
+</pre></td></tr></tbody></table> </div> <h3 id='deploying-the-engine' class='header-anchors'>Deploying the Engine</h3><p>Now your engine is ready to deploy. Run:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="gp">$ </span>pio deploy
+</pre></td></tr></tbody></table> </div> <p>When the engine is deployed successfully and running, you should see a console message similar to the following:</p><div class="highlight shell"><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="o">[</span>INFO] <span class="o">[</span>HttpListener] Bound to /0.0.0.0:8000
+<span class="o">[</span>INFO] <span class="o">[</span>MasterActor] Bind successful. Ready to serve.
+</pre></td></tr></tbody></table> </div> <p>Do not kill the deployed engine process.</p><p>By default, the deployed engine binds to <a href="http://localhost:8000"><a href="http://localhost:8000">http://localhost:8000</a></a>. You can visit that page in your web browser to check its status.</p><p><img alt="Engine Status" src="/images/engine-server-3246414b.png"/></p></p><h2 id='6.-use-the-engine' class='header-anchors'>6. Use the Engine</h2><p>Now, You can retrieve predicted results. To recommend 4 items to user ID &quot;u1&quot;. You send this JSON <code>{ &quot;userEntityId&quot;: &quot;u1&quot;, &quot;number&quot;: 4 }</code> to the deployed engine and it will return a JSON of the recommended items. Simply send a query by making a HTTP request or through the <code>EngineClient</code> of an SDK.</p><p>With the deployed engine running, open another temrinal and run the following <code>curl</code> command or use SDK to send the query:</p><div class="tabs"> <ul class="control"> <li da
 ta-lang="json"><a href="#tab-c2e1a58f-a23e-4abe-93bf-bc97c86a44ed">REST API</a></li> <li data-lang="python"><a href="#tab-595afe1b-be4d-41de-aa1d-5d96ad6e3fec">Python SDK</a></li> <li data-lang="php"><a href="#tab-09e37272-c48a-4fa9-85d3-b1d681b595e4">PHP SDK</a></li> <li data-lang="ruby"><a href="#tab-903acba3-60f0-409b-b739-bc2849d67994">Ruby SDK</a></li> <li data-lang="java"><a href="#tab-35f24332-ccc8-4d20-9339-45373dd8efec">Java SDK</a></li> </ul> <div data-tab="REST API" data-lang="json" id="tab-c2e1a58f-a23e-4abe-93bf-bc97c86a44ed"> <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
+4</pre></td> <td class="code"><pre><span class="gp">$ </span>curl -H <span class="s2">"Content-Type: application/json"</span> <span class="se">\</span>
+-d <span class="s1">'{ "userEntityId": "u1", "number": 4 }'</span> <span class="se">\</span>
+http://localhost:8000/queries.json
+
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Python SDK" data-lang="python" id="tab-595afe1b-be4d-41de-aa1d-5d96ad6e3fec"> <div class="highlight python"> <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="kn">import</span> <span class="nn">predictionio</span>
+<span class="n">engine_client</span> <span class="o">=</span> <span class="n">predictionio</span><span class="o">.</span><span class="n">EngineClient</span><span class="p">(</span><span class="n">url</span><span class="o">=</span><span class="s">"http://localhost:8000"</span><span class="p">)</span>
+<span class="k">print</span> <span class="n">engine_client</span><span class="o">.</span><span class="n">send_query</span><span class="p">({</span><span class="s">"userEntityId"</span><span class="p">:</span> <span class="s">"u1"</span><span class="p">,</span> <span class="s">"number"</span><span class="p">:</span> <span class="mi">4</span><span class="p">})</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="PHP SDK" data-lang="php" id="tab-09e37272-c48a-4fa9-85d3-b1d681b595e4"> <div class="highlight php"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10</pre></td> <td class="code"><pre><span class="cp">&lt;?php</span>
+<span class="k">require_once</span><span class="p">(</span><span class="s2">"vendor/autoload.php"</span><span class="p">);</span>
+<span class="k">use</span> <span class="nx">predictionio\EngineClient</span><span class="p">;</span>
+
+<span class="nv">$client</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">EngineClient</span><span class="p">(</span><span class="s1">'http://localhost:8000'</span><span class="p">);</span>
+
+<span class="nv">$response</span> <span class="o">=</span> <span class="nv">$client</span><span class="o">-&gt;</span><span class="na">sendQuery</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">'userEntityId'</span><span class="o">=&gt;</span> <span class="s1">'i1'</span><span class="p">,</span> <span class="s1">'number'</span><span class="o">=&gt;</span> <span class="mi">4</span><span class="p">));</span>
+<span class="nb">print_r</span><span class="p">(</span><span class="nv">$response</span><span class="p">);</span>
+
+<span class="cp">?&gt;</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Ruby SDK" data-lang="ruby" id="tab-903acba3-60f0-409b-b739-bc2849d67994"> <div class="highlight ruby"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7</pre></td> <td class="code"><pre><span class="c1"># Create client object.</span>
+<span class="n">client</span> <span class="o">=</span> <span class="no">PredictionIO</span><span class="o">::</span><span class="no">EngineClient</span><span class="p">.</span><span class="nf">new</span><span class="p">(</span><span class="s1">'http://localhost:8000'</span><span class="p">)</span>
+
+<span class="c1"># Query PredictionIO.</span>
+<span class="n">response</span> <span class="o">=</span> <span class="n">client</span><span class="p">.</span><span class="nf">send_query</span><span class="p">(</span><span class="s1">'userEntityId'</span> <span class="o">=&gt;</span> <span class="s1">'i1'</span><span class="p">,</span> <span class="s1">'number'</span> <span class="o">=&gt;</span> <span class="mi">4</span><span class="p">)</span>
+
+<span class="nb">puts</span> <span class="n">response</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Java SDK" data-lang="java" id="tab-35f24332-ccc8-4d20-9339-45373dd8efec"> <div class="highlight java"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+12
+13
+14
+15</pre></td> <td class="code"><pre><span class="kn">import</span> <span class="nn">com.google.common.collect.ImmutableMap</span><span class="o">;</span>
+<span class="kn">import</span> <span class="nn">com.google.common.collect.ImmutableList</span><span class="o">;</span>
+<span class="kn">import</span> <span class="nn">com.google.gson.JsonObject</span><span class="o">;</span>
+
+<span class="kn">import</span> <span class="nn">org.apache.predictionio.EngineClient</span><span class="o">;</span>
+
+<span class="c1">// create client object</span>
+<span class="n">EngineClient</span> <span class="n">engineClient</span> <span class="o">=</span> <span class="k">new</span> <span class="n">EngineClient</span><span class="o">(</span><span class="s">"http://localhost:8000"</span><span class="o">);</span>
+
+<span class="c1">// query</span>
+
+<span class="n">JsonObject</span> <span class="n">response</span> <span class="o">=</span> <span class="n">engineClient</span><span class="o">.</span><span class="na">sendQuery</span><span class="o">(</span><span class="n">ImmutableMap</span><span class="o">.&lt;</span><span class="n">String</span><span class="o">,</span> <span class="n">Object</span><span class="o">&gt;</span><span class="n">of</span><span class="o">(</span>
+        <span class="s">"userEntityId"</span><span class="o">,</span> <span class="s">"u1"</span><span class="o">,</span>
+        <span class="s">"number"</span><span class="o">,</span>  <span class="mi">4</span>
+    <span class="o">));</span>
+</pre></td> </tr></tbody></table> </div> </div> </div> <p>The following is sample JSON response:</p><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
+4
+5
+6
+7
+8</pre></td><td class="code"><pre><span class="o">{</span>
+  <span class="s2">"itemScores"</span>:[
+    <span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i4"</span>,<span class="s2">"score"</span>:0.006009267718658978<span class="o">}</span>,
+    <span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i33"</span>,<span class="s2">"score"</span>:0.005999267822052033<span class="o">}</span>,
+    <span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i14"</span>,<span class="s2">"score"</span>:0.005261309429391667<span class="o">}</span>,
+    <span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i3"</span>,<span class="s2">"score"</span>:0.003007015026561692<span class="o">}</span>
+  <span class="o">]</span>
+<span class="o">}</span>
+</pre></td></tr></tbody></table> </div> <p><em>MyECommerceRecommendation</em> is now running.</p><div class="alert-message info"><p>To update the model periodically with new data, simply set up a cron job to call <code>pio train</code> and <code>pio deploy</code>. The engine will continue to serve prediction results during the re-train process. After the training is completed, <code>pio deploy</code> will automatically shutdown the existing engine server and bring up a new process on the same port.</p></div><div class="alert-message info"><p><strong>Note that if you import a <em>large</em> data set</strong> and the training seems to be taking forever or getting stuck, it&#39;s likely that there is not enough executor memory. It&#39;s recommended to setup a Spark standalone cluster, you&#39;ll need to specify more driver and executor memory when training with a large data set. Please see <a href="/resources/faq/#engine-training">FAQ here</a> for instructions.</p></div> <h2 id='settin
 g-constraint-&quot;unavailableitems&quot;' class='header-anchors'>Setting constraint &quot;unavailableItems&quot;</h2><p>Now let&#39;s send an item constraint &quot;unavailableItems&quot; (replace accessKey with your Access Key):</p><div class="alert-message note"><p>You can also use SDK to send this event as described in the SDK sample above.</p></div><div class="tabs"> <ul class="control"> <li data-lang="json"><a href="#tab-004e793c-9406-4aa5-91fd-72ae58f24715">REST API</a></li> <li data-lang="python"><a href="#tab-3c244880-4864-4b50-aa40-eb79a5157619">Python SDK</a></li> <li data-lang="php"><a href="#tab-93a60337-53b3-47c2-818a-15153188c821">PHP SDK</a></li> <li data-lang="ruby"><a href="#tab-b7e8b7a0-93b1-4ce9-ab49-9ab407114bd1">Ruby SDK</a></li> <li data-lang="java"><a href="#tab-efba3f6f-1a4a-40f4-822a-7ee9c2a0450e">Java SDK</a></li> </ul> <div data-tab="REST API" data-lang="json" id="tab-004e793c-9406-4aa5-91fd-72ae58f24715"> <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
+4
+5
+6
+7
+8
+9
+10
+11</pre></td> <td class="code"><pre><span class="gp">$ </span>curl -i -X POST http://localhost:7070/events.json?accessKey<span class="o">=</span><span class="nv">$ACCESS_KEY</span> <span class="se">\</span>
+-H <span class="s2">"Content-Type: application/json"</span> <span class="se">\</span>
+-d <span class="s1">'{
+  "event" : "$set",
+  "entityType" : "constraint"
+  "entityId" : "unavailableItems",
+  "properties" : {
+    "items": ["i4", "i14", "i11"],
+  }
+  "eventTime" : "2015-02-17T02:11:21.934Z"
+}'</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Python SDK" data-lang="python" id="tab-3c244880-4864-4b50-aa40-eb79a5157619"> <div class="highlight python"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10</pre></td> <td class="code"><pre><span class="c"># Set a list of unavailable items</span>
+
+<span class="n">client</span><span class="o">.</span><span class="n">create_event</span><span class="p">(</span>
+  <span class="n">event</span><span class="o">=</span><span class="s">"$set"</span><span class="p">,</span>
+  <span class="n">entity_type</span><span class="o">=</span><span class="s">"constraint"</span><span class="p">,</span>
+  <span class="n">entity_id</span><span class="o">=</span><span class="s">"unavailableItems"</span><span class="p">,</span>
+  <span class="n">properties</span><span class="o">=</span><span class="p">{</span>
+    <span class="s">"items"</span> <span class="p">:</span> <span class="p">[</span><span class="s">"&lt;ITEM ID1&gt;"</span><span class="p">,</span> <span class="s">"&lt;ITEM ID2&gt;"</span><span class="p">]</span>
+  <span class="p">}</span>
+<span class="p">)</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="PHP SDK" data-lang="php" id="tab-93a60337-53b3-47c2-818a-15153188c821"> <div class="highlight php"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9</pre></td> <td class="code"><pre><span class="cp">&lt;?php</span>
+<span class="c1">// Set a list of unavailable items
+</span><span class="nv">$client</span><span class="o">-&gt;</span><span class="na">createEvent</span><span class="p">(</span><span class="k">array</span><span class="p">(</span>
+  <span class="s1">'event'</span> <span class="o">=&gt;</span> <span class="s1">'$set'</span><span class="p">,</span>
+  <span class="s1">'entityType'</span> <span class="o">=&gt;</span> <span class="s1">'constraint'</span><span class="p">,</span>
+  <span class="s1">'entityId'</span> <span class="o">=&gt;</span> <span class="s1">'unavailableItems'</span><span class="p">,</span>
+  <span class="s1">'properties'</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">'items'</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">'&lt;ITEM ID1&gt;'</span><span class="p">,</span> <span class="s1">'&lt;ITEM ID2&gt;'</span><span class="p">))</span>
+<span class="p">));</span>
+<span class="cp">?&gt;</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Ruby SDK" data-lang="ruby" id="tab-b7e8b7a0-93b1-4ce9-ab49-9ab407114bd1"> <div class="highlight ruby"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8</pre></td> <td class="code"><pre><span class="c1"># Set a list of unavailable items</span>
+<span class="n">client</span><span class="p">.</span><span class="nf">create_event</span><span class="p">(</span>
+  <span class="s1">'$set'</span><span class="p">,</span>
+  <span class="s1">'constraint'</span><span class="p">,</span>
+  <span class="s1">'unavailableItems'</span><span class="p">,</span> <span class="p">{</span>
+    <span class="s1">'properties'</span> <span class="o">=&gt;</span> <span class="p">{</span> <span class="s1">'items'</span> <span class="o">=&gt;</span> <span class="p">[</span><span class="s1">'&lt;ITEM ID1&gt;'</span><span class="p">,</span> <span class="s1">'&lt;ITEM ID2&gt;'</span><span class="p">]</span> <span class="p">}</span>
+  <span class="p">}</span>
+<span class="p">)</span>
+</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Java SDK" data-lang="java" id="tab-efba3f6f-1a4a-40f4-822a-7ee9c2a0450e"> <div class="highlight java"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7</pre></td> <td class="code"><pre><span class="c1">// Set a list of unavailable items</span>
+<span class="n">Event</span> <span class="n">itemEvent</span> <span class="o">=</span> <span class="k">new</span> <span class="n">Event</span><span class="o">()</span>
+  <span class="o">.</span><span class="na">event</span><span class="o">(</span><span class="s">"$set"</span><span class="o">)</span>
+  <span class="o">.</span><span class="na">entityType</span><span class="o">(</span><span class="s">"constraint"</span><span class="o">)</span>
+  <span class="o">.</span><span class="na">entityId</span><span class="o">(</span><span class="s">"unavailableItems"</span><span class="o">)</span>
+  <span class="o">.</span><span class="na">property</span><span class="o">(</span><span class="s">"items"</span><span class="o">,</span> <span class="n">ImmutableList</span><span class="o">.</span><span class="na">of</span><span class="o">(</span><span class="s">"&lt;ITEM ID1&gt;"</span><span class="o">,</span> <span class="s">"&lt;ITEM ID2&gt;"</span><span class="o">));</span>
+<span class="n">client</span><span class="o">.</span><span class="na">createEvent</span><span class="o">(</span><span class="n">itemEvent</span><span class="o">)</span>
+</pre></td> </tr></tbody></table> </div> </div> </div> <p>Try to get recommendation for user <em>u1</em> again, the unavaiable items (e.g. i4, i14, i11). won&#39;t be recommended anymore:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9</pre></td><td class="code"><pre><span class="gp">$ </span>curl -H <span class="s2">"Content-Type: application/json"</span> <span class="se">\</span>
+-d <span class="s1">'{
+  "userEntityId": "u1",
+  "number": 4,
+  "blackList": ["i21", "i26", "i40"]
+}'</span> <span class="se">\</span>
+http://localhost:8000/queries.json
+
+<span class="o">{</span><span class="s2">"itemScores"</span>:[<span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i33"</span>,<span class="s2">"score"</span>:0.005999267822052019<span class="o">}</span>,<span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i3"</span>,<span class="s2">"score"</span>:0.0030070150265619003<span class="o">}</span>,<span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i2"</span>,<span class="s2">"score"</span>:0.0028489173099429527<span class="o">}</span>,<span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i5"</span>,<span class="s2">"score"</span>:0.0028489173099429527<span class="o">}]}</span>
+</pre></td></tr></tbody></table> </div> <div class="alert-message info"><p>You should send a full list of unavailable items whenever there is any updates in the list. The latest event is used.</p></div><p>When there is no more unavilable items, simply set an empty list. ie.</p><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
+4
+5
+6
+7
+8
+9
+10
+11</pre></td><td class="code"><pre><span class="gp">$ </span>curl -i -X POST http://localhost:7070/events.json?accessKey<span class="o">=</span>zPkr6sBwQoBwBjVHK2hsF9u26L38ARSe19QzkdYentuomCtYSuH0vXP5fq7advo4 <span class="se">\</span>
+-H <span class="s2">"Content-Type: application/json"</span> <span class="se">\</span>
+-d <span class="s1">'{
+  "event" : "$set",
+  "entityType" : "constraint"
+  "entityId" : "unavailableItems",
+  "properties" : {
+    "items": [],
+  }
+  "eventTime" : "2015-02-18T02:11:21.934Z"
+}'</span>
+</pre></td></tr></tbody></table> </div> <h2 id='advanced-query' class='header-anchors'>Advanced Query</h2><p>In addition, the Query support the following optional parameters <code>categories</code>, <code>whitelist</code> and <code>blacklist</code>.</p><h3 id='recommend-items-in-selected-categories:' class='header-anchors'>Recommend items in selected categories:</h3><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9</pre></td><td class="code"><pre><span class="gp">$ </span>curl -H <span class="s2">"Content-Type: application/json"</span> <span class="se">\</span>
+-d <span class="s1">'{
+  "userEntityId": "u1",
+  "number": 4,
+  "categories" : ["c4", "c3"]
+}'</span> <span class="se">\</span>
+http://localhost:8000/queries.json
+
+<span class="o">{</span><span class="s2">"itemScores"</span>:[<span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i4"</span>,<span class="s2">"score"</span>:0.006009267718658978<span class="o">}</span>,<span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i33"</span>,<span class="s2">"score"</span>:0.005999267822052033<span class="o">}</span>,<span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i14"</span>,<span class="s2">"score"</span>:0.005261309429391667<span class="o">}</span>,<span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i2"</span>,<span class="s2">"score"</span>:0.002848917309942939<span class="o">}]}</span>
+</pre></td></tr></tbody></table> </div> <h3 id='recommend-items-in-the-whitelist:' class='header-anchors'>Recommend items in the whitelist:</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
+4
+5
+6
+7
+8
+9</pre></td><td class="code"><pre><span class="gp">$ </span>curl -H <span class="s2">"Content-Type: application/json"</span> <span class="se">\</span>
+-d <span class="s1">'{
+  "userEntityId": "u1",
+  "number": 4,
+  "whitelist": ["i1", "i2", "i3", "i21", "i22", "i23", "i24", "i25"]
+}'</span> <span class="se">\</span>
+http://localhost:8000/queries.json
+
+<span class="o">{</span><span class="s2">"itemScores"</span>:[<span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i3"</span>,<span class="s2">"score"</span>:0.003007015026561692<span class="o">}</span>,<span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i2"</span>,<span class="s2">"score"</span>:0.002848917309942939<span class="o">}</span>,<span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i23"</span>,<span class="s2">"score"</span>:0.0016857619403278443<span class="o">}</span>,<span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i25"</span>,<span class="s2">"score"</span>:1.3707548965227745E-4<span class="o">}]}</span>
+</pre></td></tr></tbody></table> </div> <h3 id='recommend-items-not-in-the-blacklist:' class='header-anchors'>Recommend items not in the blackList:</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
+4
+5
+6
+7
+8
+9
+10</pre></td><td class="code"><pre><span class="gp">$ </span>curl -H <span class="s2">"Content-Type: application/json"</span> <span class="se">\</span>
+-d <span class="s1">'{
+  "userEntityId": "u1",
+  "number": 4,
+  "categories" : ["c4", "c3"],
+  "blacklist": ["i21", "i26", "i40"]
+}'</span> <span class="se">\</span>
+http://localhost:8000/queries.json
+
+<span class="o">{</span><span class="s2">"itemScores"</span>:[<span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i4"</span>,<span class="s2">"score"</span>:0.006009267718658978<span class="o">}</span>,<span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i33"</span>,<span class="s2">"score"</span>:0.005999267822052033<span class="o">}</span>,<span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i14"</span>,<span class="s2">"score"</span>:0.005261309429391667<span class="o">}</span>,<span class="o">{</span><span class="s2">"itemEntityId"</span>:<span class="s2">"i2"</span>,<span class="s2">"score"</span>:0.002848917309942939<span class="o">}]}</span>
+</pre></td></tr></tbody></table> </div> <h4 id='<a-href="../dase/">next:-dase-components-explained</a>' class='header-anchors' ><a href="../dase/">Next: DASE Components Explained</a></h4></div></div></div></div><footer><div class="container"><div class="seperator"></div><div class="row"><div class="col-md-6 col-xs-6 footer-link-column"><div class="footer-link-column-row"><h4>Community</h4><ul><li><a href="//docs.prediction.io/install/" target="blank">Download</a></li><li><a href="//docs.prediction.io/" 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 col-xs-6 footer-link-column"><div class="footer-link-column-row"><h4>Contribute</h4><ul><li><a href="//predicti
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