<!DOCTYPE html><html><head><title>Quick Start - Similar Product Engine Template</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 - Similar Product Engine Template"/><link rel="canonical" href="https://docs.prediction.io/templates/similarproduct/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-3598c7d7.css" rel="stylesheet" type="text/css"/><script 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hidden-lg"><div id="page-title"><h1>Quick Start - Similar Product Engine Template</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="#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="#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/similarproduct/quickstart.html.md.erb"><img src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div class="content-header hidden-sm hidden-xs"><div id="page-title"><h1>Quick Start - Similar Product Engine Template</h1></div></div><div class="content"><h2 id='overview' class='header-anchors'>Overview</h2><p>This engine template recommends products that are &quot;similar&quot; to the input product(s). Similarity is not defined by user or item attributes but by users&#39; previous actions. By default, it uses &#39;view&#39; action such that product A and B are considered similar if most users who view A also view B. The template can be customized to support other action types such as buy, rate, like..etc.</p><p>This template is ideal for recommending products to customers based on their recent actions. Using the IDs of the recently viewed products of a customer as the <em>Query</em>, the engine will predict other products that this customer may also like.</p><p>This approach works perfectly for customers who are <strong>first-time visitors</strong> or have not signed in. Recommendations are made dynamically in <em>real-time</em> based on the most recent product preference you provide in the <em>Query</em>. You can, therefore, recommend products to visitors without knowing a long history about them.</p><p>You can also use this template to build the popular feature of Amazon: <strong>&quot;Customers Who Viewed This Item Also Viewed...&quot;</strong> quickly. Help your customers explore more products that they like, and sell more products.</p><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 as Training Data:</p> <ul> <li>User <em>$set</em> events</li> <li>Item <em>$set</em> events with <em>categories</em> properties</li> <li>Users&#39; <em>view</em> item events</li> </ul> <div class="alert-message info"><p>This template can easily be customized to consider more user events such as <em>buy</em>, <em>rate</em> and <em>like</em>. You can offer features like &quot;Customers Who Bought This Item Also Bought....&quot;.</p></div><h3 id='input-query' class='header-anchors'>Input Query</h3> <ul> <li>List of ItemIDs, which are the targeted products</li> <li>N (number of items to be recommended)</li> <li>List of white-listed item categories (optional)</li> <li>List of white-listed ItemIds (optional)</li> <li>List of black-listed ItemIds (optional)</li> </ul> <p>The template also supports black-list and white-list. If a white-list is provided, the engine will include only those products in the recommendation. Likewise, if a black-list 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 itemIDs</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 0.9.6</a> (if you haven&#39;t done it).</p><p>Let&#39;s say you have installed 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>MySimilarProduct</em> by downloading the Similar Product 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-scala-parallel-similarproduct MySimilarProduct
<span class="gp">$ </span><span class="nb">cd </span>MySimilarProduct
</pre></td></tr></tbody></table> </div> <p>A new directory <em>MySimilarProduct</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 some training data for the app of this Engine. By default, the Similar Product Engine Template supports 2 types of entities: <strong>user</strong> and <strong>item</strong>, and event <strong>view</strong>. An item has the <strong>categories</strong> property, which is a list of category names (String). A user can view an item. Respectively, this template requires &#39;$set&#39; user event, &#39;$set&#39; item event, and user-view-item events.</p><div class="alert-message info"><p>This template can easily be customized to consider more user events such as <em>buy</em>, <em>rate</em> and <em>like</em>.</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>$set</code> event for this user. To send this event, run the following <code>curl</code> command:</p><div class="tabs"> <ul class="control"> <li data-lang="json"><a href="#tab-77c046a1-1485-4002-aa9d-9a385c6be003">REST API</a></li> <li data-lang="python"><a href="#tab-7ea76e6c-a3ea-484b-9284-de189e4cc5d2">Python SDK</a></li> <li data-lang="php"><a href="#tab-afbe0cfd-6b54-4428-aaaf-2cc7f64650cb">PHP SDK</a></li> <li data-lang="ruby"><a href="#tab-0f525d6c-5231-43e8-8108-4bfe59e625e7">Ruby SDK</a></li> <li data-lang="java"><a href="#tab-8594e0e3-3099-4bea-b616-d4599ebb9808">Java SDK</a></li> </ul> <div data-tab="REST API" data-lang="json" id="tab-77c046a1-1485-4002-aa9d-9a385c6be003"> <div class="highlight shell"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
2
3
4
5
6
7
8</pre></td> <td class="code"><pre><span class="gp">$ </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-7ea76e6c-a3ea-484b-9284-de189e4cc5d2"> <div class="highlight python"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
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<span class="kn">from</span> <span class="nn">datetime</span> <span class="kn">import</span> <span class="n">datetime</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>
  <span class="c"># current time will be used if event_time is not specified</span>
  <span class="n">event_time</span><span class="o">=</span><span class="n">datetime</span><span class="p">(</span>
    <span class="mi">2014</span><span class="p">,</span> <span class="mi">11</span><span class="p">,</span> <span class="mo">02</span><span class="p">,</span> <span class="mi">09</span><span class="p">,</span> <span class="mi">39</span><span class="p">,</span> <span class="mi">45</span><span class="p">,</span> <span class="mi">618000</span><span class="p">,</span> <span class="n">pytz</span><span class="o">.</span><span class="n">timezone</span><span class="p">(</span><span class="s">'US/Pacific'</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-afbe0cfd-6b54-4428-aaaf-2cc7f64650cb"> <div class="highlight php"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
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<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="cp">?&gt;</span>
</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Ruby SDK" data-lang="ruby" id="tab-0f525d6c-5231-43e8-8108-4bfe59e625e7"> <div class="highlight ruby"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
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<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-8594e0e3-3099-4bea-b616-d4599ebb9808"> <div class="highlight java"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
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<span class="kn">import</span> <span class="nn">io.prediction.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-adcabfa1-10a0-4884-8137-234e974609eb">REST API</a></li> <li data-lang="python"><a href="#tab-71fc38d0-4bec-4323-84b5-3fefd2687e44">Python SDK</a></li> <li data-lang="php"><a href="#tab-0bf68c07-442e-4ea7-b415-120f6602d6a3">PHP SDK</a></li> <li data-lang="ruby"><a href="#tab-3158fd60-9ab3-4c3f-9c4b-e87b315e06ab">Ruby SDK</a></li> <li data-lang="java"><a href="#tab-a672baf1-62c1-465a-a9f7-98460235094c">Java SDK</a></li> </ul> <div data-tab="REST API" data-lang="json" id="tab-adcabfa1-10a0-4884-8137-234e974609eb"> <div class="highlight shell"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
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-H <span class="s2">"Content-Type: application/json"</span> <span class="se">\</span>
-d <span class="s1">'{
  "event" : "$set",
  "entityType" : "item"
  "entityId" : "i0",
  "properties" : {
    "categories" : ["c1", "c2"]
  }
  "eventTime" : "2014-11-02T09:39:45.618-08:00"
}'</span>
</pre></td> </tr></tbody></table> </div> </div> <div data-tab="Python SDK" data-lang="python" id="tab-71fc38d0-4bec-4323-84b5-3fefd2687e44"> <div class="highlight python"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
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<span class="n">client</span><span class="o">.</span><span class="n">create_event</span><span class="p">(</span>
  <span class="n">event</span><span class="o">=</span><span class="s">"$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-0bf68c07-442e-4ea7-b415-120f6602d6a3"> <div class="highlight php"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
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<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-3158fd60-9ab3-4c3f-9c4b-e87b315e06ab"> <div class="highlight ruby"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
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<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-a672baf1-62c1-465a-a9f7-98460235094c"> <div class="highlight java"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
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<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>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-8946c5e7-c2b8-43df-b05f-1f99eef3a2e5">REST API</a></li> <li data-lang="python"><a href="#tab-c0ef6c3f-8729-4a5c-9ceb-8411f6ad47e0">Python SDK</a></li> <li data-lang="php"><a href="#tab-f16e4ef4-6fdb-4cfd-9b09-7893ada51f76">PHP SDK</a></li> <li data-lang="ruby"><a href="#tab-dafff249-04b7-457d-bb35-4162aadfc154">Ruby SDK</a></li> <li data-lang="java"><a href="#tab-ebac17f4-7f51-417a-8fcc-4a536c66a302">Java SDK</a></li> </ul> <div data-tab="REST API" data-lang="json" id="tab-8946c5e7-c2b8-43df-b05f-1f99eef3a2e5"> <div class="highlight shell"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
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-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-c0ef6c3f-8729-4a5c-9ceb-8411f6ad47e0"> <div class="highlight python"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
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<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-f16e4ef4-6fdb-4cfd-9b09-7893ada51f76"> <div class="highlight php"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
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<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-dafff249-04b7-457d-bb35-4162aadfc154"> <div class="highlight ruby"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
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<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-ebac17f4-7f51-417a-8fcc-4a536c66a302"> <div class="highlight java"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
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<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><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">$ACCESS_KEY</span><span class="s2">&quot;</span>
</pre></td></tr></tbody></table> </div> <div class="alert-message note"><p>Note that you should quote the entire URL by using single or double quotes when you run the <code>curl</code> command.</p></div><p>It should return the imported events in JSON format. You can refer to <a href="/datacollection/eventapi/#debugging-recipes">Event Server Debugging Recipes</a> for more different ways to query Event Server.</p></p><h3 id='import-more-sample-data' class='header-anchors'>Import More Sample Data</h3><p>This engine requires more data in order to train a useful model. Instead of sending more events one by one in real time, for quickstart demonstration purpose, we are going to use a script to import more events in batch.</p> <p>A Python import script <code>import_eventserver.py</code> is provided to import sample data. It imports 10 users (with user ID &quot;u1&quot; to &quot;u10&quot;) and 50 items (with item ID &quot;i1&quot; to &quot;i50&quot;) with some random assigned categories ( with categories &quot;c1&quot; to &quot;c6&quot;). Each user then randomly view 10 items.</p><p>First, you will need to install Python SDK in order to run the sample data import script. To install Python SDK, run:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre><span class="gp">$ </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>MySimilarProduct</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>MySimilarProduct
<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</pre></td><td class="code"><pre>...
User u10 views item i20
User u10 views item i17
User u10 views item i22
User u10 views item i31
User u10 views item i18
User u10 views item i29
160 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>MySimilarProduct</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>MySimilarProduct
</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> <p><h3 id='building' class='header-anchors'>Building</h3><p>Start with building your <em>MySimilarProduct</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 retrieve 4 items which are similar to item ID &quot;i1&quot;. You send this JSON <code>{ &quot;items&quot;: [&quot;i1&quot;], &quot;num&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 data-lang="json"><a href="#tab-65a3eb17-439f-42ba-9c21-1aad0db34ba3">REST API</a></li> <li data-lang="python"><a href="#tab-92f2b0c5-8fc3-4c7e-962e-8eb31f1865e6">Python SDK</a></li> <li data-lang="php"><a href="#tab-35c52482-d9dd-4a9e-b9e2-020612a83e2b">PHP SDK</a></li> <li data-lang="ruby"><a href="#tab-bd745ab5-80dd-4b9a-a452-798d6428a6ab">Ruby SDK</a></li> <li data-lang="java"><a href="#tab-bf6181e0-9c42-4fa7-9959-9e912fb31b83">Java SDK</a></li> </ul> <div data-tab="REST API" data-lang="json" id="tab-65a3eb17-439f-42ba-9c21-1aad0db34ba3"> <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">'{ "items": ["i1"], "num": 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-92f2b0c5-8fc3-4c7e-962e-8eb31f1865e6"> <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">"items"</span><span class="p">:</span> <span class="p">[</span><span class="s">"i1"</span><span class="p">],</span> <span class="s">"num"</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-35c52482-d9dd-4a9e-b9e2-020612a83e2b"> <div class="highlight php"> <table style="border-spacing: 0"><tbody><tr> <td class="gutter gl" style="text-align: right"><pre class="lineno">1
2
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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">'items'</span><span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">'i1'</span><span class="p">),</span> <span class="s1">'num'</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-bd745ab5-80dd-4b9a-a452-798d6428a6ab"> <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
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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">'items'</span> <span class="o">=&gt;</span> <span class="p">[</span><span class="s1">'i1'</span><span class="p">],</span> <span class="s1">'num'</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-bf6181e0-9c42-4fa7-9959-9e912fb31b83"> <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
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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">io.prediction.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">"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">"i1"</span><span class="o">),</span>
        <span class="s">"num"</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">"item"</span>:<span class="s2">"i43"</span>,<span class="s2">"score"</span>:0.7071067811865475<span class="o">}</span>,
    <span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i21"</span>,<span class="s2">"score"</span>:0.7071067811865475<span class="o">}</span>,
    <span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i46"</span>,<span class="s2">"score"</span>:0.5773502691896258<span class="o">}</span>,
    <span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i8"</span>,<span class="s2">"score"</span>:0.5773502691896258<span class="o">}</span>
  <span class="o">]</span>
<span class="o">}</span>
</pre></td></tr></tbody></table> </div> <p><em>MySimilarProduct</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='advanced-query' class='header-anchors'>Advanced Query</h2><h3 id='recommend-items-which-are-similar-to-multiple-items:' class='header-anchors'>Recommend items which are similar to multiple items:</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</pre></td><td class="code"><pre>curl -H <span class="s2">"Content-Type: application/json"</span> <span class="se">\</span>
-d <span class="s1">'{ "items": ["i1", "i3"], "num": 10}'</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">"item"</span>:<span class="s2">"i12"</span>,<span class="s2">"score"</span>:1.1700499715209998<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i21"</span>,<span class="s2">"score"</span>:1.1153550716504106<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i43"</span>,<span class="s2">"score"</span>:1.1153550716504106<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i14"</span>,<span class="s2">"score"</span>:1.0773502691896257<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i39"</span>,<span class="s2">"score"</span>:1.0773502691896257<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i26"</span>,<span class="s2">"score"</span>:1.0773502691896257<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i44"</span>,<span class="s2">"score"</span>:1.0773502691896257<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i38"</span>,<span class="s2">"score"</span>:0.9553418012614798<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i36"</span>,<span class="s2">"score"</span>:0.9106836025229592<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i46"</span>,<span class="s2">"score"</span>:0.9106836025229592<span class="o">}]}</span>
</pre></td></tr></tbody></table> </div> <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>curl -H <span class="s2">"Content-Type: application/json"</span> <span class="se">\</span>
-d <span class="s1">'{
  "items": ["i1", "i3"],
  "num": 10,
  "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">"item"</span>:<span class="s2">"i21"</span>,<span class="s2">"score"</span>:1.1153550716504106<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i14"</span>,<span class="s2">"score"</span>:1.0773502691896257<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i26"</span>,<span class="s2">"score"</span>:1.0773502691896257<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i39"</span>,<span class="s2">"score"</span>:1.0773502691896257<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i44"</span>,<span class="s2">"score"</span>:1.0773502691896257<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i45"</span>,<span class="s2">"score"</span>:0.7886751345948129<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i47"</span>,<span class="s2">"score"</span>:0.7618016810571367<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i9"</span>,<span class="s2">"score"</span>:0.7618016810571367<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i28"</span>,<span class="s2">"score"</span>:0.7618016810571367<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i6"</span>,<span class="s2">"score"</span>:0.7618016810571367<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
10</pre></td><td class="code"><pre>curl -H <span class="s2">"Content-Type: application/json"</span> <span class="se">\</span>
-d <span class="s1">'{
  "items": ["i1", "i3"],
  "num": 10,
  "categories" : ["c4", "c3"],
  "whiteList": ["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">"item"</span>:<span class="s2">"i21"</span>,<span class="s2">"score"</span>:1.1153550716504106<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i26"</span>,<span class="s2">"score"</span>:1.0773502691896257<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>curl -H <span class="s2">"Content-Type: application/json"</span> <span class="se">\</span>
-d <span class="s1">'{
  "items": ["i1", "i3"],
  "num": 10,
  "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">"item"</span>:<span class="s2">"i39"</span>,<span class="s2">"score"</span>:1.0773502691896257<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i44"</span>,<span class="s2">"score"</span>:1.0773502691896257<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i14"</span>,<span class="s2">"score"</span>:1.0773502691896257<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i45"</span>,<span class="s2">"score"</span>:0.7886751345948129<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i47"</span>,<span class="s2">"score"</span>:0.7618016810571367<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i6"</span>,<span class="s2">"score"</span>:0.7618016810571367<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i28"</span>,<span class="s2">"score"</span>:0.7618016810571367<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i9"</span>,<span class="s2">"score"</span>:0.7618016810571367<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i29"</span>,<span class="s2">"score"</span>:0.6220084679281463<span class="o">}</span>,<span class="o">{</span><span class="s2">"item"</span>:<span class="s2">"i30"</span>,<span class="s2">"score"</span>:0.5386751345948129<span class="o">}]}</span>
</pre></td></tr></tbody></table> </div> <h4 id='<a-href="/templates/similarproduct/dase/">next:-dase-components-explained</a>' class='header-anchors' ><a href="/templates/similarproduct/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="//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><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/incubator-predictionio#forks_count" data-count-aria-label="# forks on GitHub" aria-label="Fork apache/incubator-predictionio on GitHub">Fork</a> <script id="github-bjs" async="" defer="" src="https://buttons.github.io/buttons.js"></script><a href="//www.facebook.com/predictionio" target="blank"><img alt="PredictionIO on Twitter" src="/images/icons/twitter-ea9dc152.png"/></a> <a href="//twitter.com/predictionio" target="blank"><img alt="PredictionIO on Facebook" src="/images/icons/facebook-5c57939c.png"/></a> </div></div></div></div></div></footer></div><script>(function(w,d,t,u,n,s,e){w['SwiftypeObject']=n;w[n]=w[n]||function(){
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