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+<!DOCTYPE html><html><head><title>Language Samples</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="Language Samples"/><link 
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Events</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/customize-data-prep/"><span>Customize Data 
Preparator</span></a></li><li class="level-3"><a class="final" 
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Serving</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/training-with-implicit-preference/"><span>Train 
with Implicit Preference</span></a></li><li class="level-3"><a class="final" 
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Items by Blacklist in Query</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/batch-evaluator/"><span>Batch Persistable 
Evaluator</span></a></li></ul></li><li class="level-2"><a class="expandible" 
href="#"><span>E-Commerce Recommendation</span></a><ul><li class="level-3"><a 
class="final" href="/templ
 ates/ecommercerecommendation/quickstart/"><span>Quick Start</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/dase/"><span>DASE</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/how-to/"><span>How-To</span></a></li><li
 class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/train-with-rate-event/"><span>Train 
with Rate Event</span></a></li><li class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/adjust-score/"><span>Adjust 
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Start</span></a></li><li class="level-3"><a class="final" 
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 class="level-3"><a class="final" 
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Events and Multiple Algorithms</span></a></li><li class="level-3"><a 
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Event</span></a></li><li class="level-3"><a class="final" 
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for Users</span></a></li><li class="level-3"><a class="final" 
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Users</span></a></li></ul></li><li class="level-2"><a class="expandible" 
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Start</span></a></li><li class="level-3"><a class="final" 
href="/templates/classification/dase/"><span>DASE</span><
 /a></li><li class="level-3"><a class="final" 
href="/templates/classification/how-to/"><span>How-To</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/classification/add-algorithm/"><span>Use Alternative 
Algorithm</span></a></li><li class="level-3"><a class="final" 
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 ><span>FAQs</span></a></li><li class="level-2"><a class="final" 
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 >href="/resources/intellij/"><span>Developing Engines with IntelliJ 
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 >class="level-2"><a class="final" 
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 class="level-2"><a class="final" 
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 class="col-md-9 col-sm-12"><div class="content-header hidden-md 
hidden-lg"><div id="page-title"><h1>Language Samples</h1></div></div><div 
id="table-of-content-wrapper"><h5>On this page</h5><aside 
id="table-of-contents"><ul> <li> <a href="#plain-text">Plain Text</a> </li> 
<li> <a href="#scala">Scala</a> </li> <li> <a href="#ruby">Ruby</a> </li> <li> 
<a href="#json">JSON</a> </li> <li> <a href="#php">PHP</a> </li> <li> <a 
href="#python">Python</a> </li> </ul> </aside><hr/><a id="edit-page-link" 
href="https://github.com/apache/incubator-predictionio/tree/livedoc/doc
 s/manual/source/samples/languages.html.md"><img 
src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div 
class="content-header hidden-sm hidden-xs"><div id="page-title"><h1>Language 
Samples</h1></div></div><div class="content"> <h2 id='plain-text' 
class='header-anchors'>Plain Text</h2><p>This is a sample code block with no 
language.</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="gp">$ </span><span 
class="nv">$PIO_HOME</span>/bin/pio eventserver
+<span class="gp">$ </span><span class="nb">cd</span> /path/to/engine
+<span class="gp">$ </span>../bin/pio train
+<span class="gp">$ </span>../bin/pio deploy
+</pre></td></tr></tbody></table> </div> <h2 id='scala' 
class='header-anchors'>Scala</h2><p>This is a sample Scala code block:</p><div 
class="highlight scala"><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="k">class</span> <span 
class="nc">Preparator</span>
+  <span class="k">extends</span> <span class="nc">PPreparator</span><span 
class="o">[</span><span class="kt">TrainingData</span>, <span 
class="kt">PreparedData</span><span class="o">]</span> <span class="o">{</span>
+
+  <span class="k">def</span> <span class="n">prepare</span><span 
class="o">(</span><span class="n">sc</span><span class="k">:</span> <span 
class="kt">SparkContext</span><span class="o">,</span> <span 
class="n">trainingData</span><span class="k">:</span> <span 
class="kt">TrainingData</span><span class="o">)</span><span class="k">:</span> 
<span class="kt">PreparedData</span> <span class="o">=</span> <span 
class="o">{</span>
+    <span class="k">new</span> <span class="nc">PreparedData</span><span 
class="o">(</span><span class="n">ratings</span> <span class="k">=</span> <span 
class="n">trainingData</span><span class="o">.</span><span 
class="n">ratings</span><span class="o">)</span>
+  <span class="o">}</span>
+<span class="o">}</span>
+
+<span class="k">class</span> <span class="nc">PreparedData</span><span 
class="o">(</span>
+  <span class="k">val</span> <span class="n">ratings</span><span 
class="k">:</span> <span class="kt">RDD</span><span class="o">[</span><span 
class="kt">Rating</span><span class="o">]</span>
+<span class="o">)</span>
+</pre></td></tr></tbody></table> </div> <h2 id='ruby' 
class='header-anchors'>Ruby</h2><p>This is a sample Ruby code block:</p><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</pre></td><td class="code"><pre><span class="k">class</span> <span 
class="nc">UsersController</span> <span class="o">&lt;</span> <span 
class="no">ApplicationController</span>
+  <span class="k">def</span> <span class="nf">index</span>
+    <span class="vi">@users</span> <span class="o">=</span> <span 
class="no">User</span><span class="p">.</span><span 
class="nf">order</span><span class="p">(</span><span class="s1">'reviews_count 
DESC'</span><span class="p">).</span><span class="nf">limit</span><span 
class="p">(</span><span class="mi">20</span><span class="p">)</span>
+  <span class="k">end</span>
+<span class="k">end</span>
+</pre></td></tr></tbody></table> </div> <h2 id='json' 
class='header-anchors'>JSON</h2><p>This is a sample JSON code block:</p><div 
class="highlight json"><table style="border-spacing: 0"><tbody><tr><td 
class="gutter gl" style="text-align: right"><pre class="lineno">1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+11
+12
+13
+14</pre></td><td class="code"><pre><span class="p">{</span><span class="w">
+  </span><span class="err">...</span><span class="w">
+  </span><span class="s2">"algorithms"</span><span class="p">:</span><span 
class="w"> </span><span class="p">[</span><span class="w">
+    </span><span class="p">{</span><span class="w">
+      </span><span class="s2">"name"</span><span class="p">:</span><span 
class="w"> </span><span class="s2">"als"</span><span class="p">,</span><span 
class="w">
+      </span><span class="s2">"params"</span><span class="p">:</span><span 
class="w"> </span><span class="p">{</span><span class="w">
+        </span><span class="s2">"rank"</span><span class="p">:</span><span 
class="w"> </span><span class="mi">10</span><span class="p">,</span><span 
class="w">
+        </span><span class="s2">"numIterations"</span><span 
class="p">:</span><span class="w"> </span><span class="mi">20</span><span 
class="p">,</span><span class="w">
+        </span><span class="s2">"lambda"</span><span class="p">:</span><span 
class="w"> </span><span class="mf">0.01</span><span class="w">
+      </span><span class="p">}</span><span class="w">
+    </span><span class="p">}</span><span class="w">
+  </span><span class="p">]</span><span class="w">
+  </span><span class="err">...</span><span class="w">
+</span><span class="p">}</span><span class="w">
+</span></pre></td></tr></tbody></table> </div> <h2 id='php' 
class='header-anchors'>PHP</h2><p>This is a sample PHP code block:</p><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</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">$client</span> <span class="o">=</span> <span 
class="k">new</span> <span class="nx">EventClient</span><span 
class="p">(</span><span class="o">&lt;</span><span class="nx">ACCESS</span> 
<span class="nx">KEY</span><span class="o">&gt;</span><span class="p">,</span> 
<span class="o">&lt;</span><span class="nx">URL</span> <span 
class="nx">OF</span> <span class="nx">EVENTSERVER</span><span 
class="o">&gt;</span><span class="p">);</span>
+
+<span class="c1">// Set the 4 properties for a user
+</span><span class="nv">$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="s1">'properties'</span> <span class="o">=&gt;</span> <span 
class="k">array</span><span class="p">(</span>
+    <span class="s1">'attr0'</span> <span class="o">=&gt;</span> <span 
class="o">&lt;</span><span class="nx">VALUE</span> <span class="nx">OF</span> 
<span class="nx">ATTR0</span><span class="o">&gt;</span><span class="p">,</span>
+    <span class="s1">'attr1'</span> <span class="o">=&gt;</span> <span 
class="o">&lt;</span><span class="nx">VALUE</span> <span class="nx">OF</span> 
<span class="nx">ATTR1</span><span class="o">&gt;</span><span class="p">,</span>
+    <span class="s1">'attr2'</span> <span class="o">=&gt;</span> <span 
class="o">&lt;</span><span class="nx">VALUE</span> <span class="nx">OF</span> 
<span class="nx">ATTR2</span><span class="o">&gt;</span><span class="p">,</span>
+    <span class="s1">'plan'</span> <span class="o">=&gt;</span> <span 
class="o">&lt;</span><span class="nx">VALUE</span> <span class="nx">OF</span> 
<span class="nx">PLAN</span><span class="o">&gt;</span>
+    <span class="p">)</span>
+  <span class="p">));</span>
+<span class="cp">?&gt;</span>
+</pre></td></tr></tbody></table> </div> <h2 id='python' 
class='header-anchors'>Python</h2><p>This is a sample Python code 
block:</p><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
+17
+18
+19
+20
+21
+22</pre></td><td class="code"><pre><span class="kn">from</span> <span 
class="nn">predictionio</span> <span class="kn">import</span> <span 
class="n">EventClient</span>
+<span class="kn">from</span> <span class="nn">datetime</span> <span 
class="kn">import</span> <span class="n">datetime</span>
+<span class="kn">import</span> <span class="nn">pytz</span>
+<span class="n">client</span> <span class="o">=</span> <span 
class="n">EventClient</span><span class="p">(</span><span 
class="n">app_id</span><span class="o">=</span><span class="mi">4</span><span 
class="p">,</span> <span class="n">url</span><span class="o">=</span><span 
class="s">"http://localhost:7070";</span><span class="p">)</span>
+
+<span class="n">first_event_properties</span> <span class="o">=</span> <span 
class="p">{</span>
+    <span class="s">"prop1"</span> <span class="p">:</span> <span 
class="mi">1</span><span class="p">,</span>
+    <span class="s">"prop2"</span> <span class="p">:</span> <span 
class="s">"value2"</span><span class="p">,</span>
+    <span class="s">"prop3"</span> <span class="p">:</span> <span 
class="p">[</span><span class="mi">1</span><span class="p">,</span> <span 
class="mi">2</span><span class="p">,</span> <span class="mi">3</span><span 
class="p">],</span>
+    <span class="s">"prop4"</span> <span class="p">:</span> <span 
class="bp">True</span><span class="p">,</span>
+    <span class="s">"prop5"</span> <span class="p">:</span> <span 
class="p">[</span><span class="s">"a"</span><span class="p">,</span> <span 
class="s">"b"</span><span class="p">,</span> <span class="s">"c"</span><span 
class="p">],</span>
+    <span class="s">"prop6"</span> <span class="p">:</span> <span 
class="mf">4.56</span> <span class="p">,</span>
+    <span class="p">}</span>
+<span class="n">first_event_time</span> <span class="o">=</span> <span 
class="n">datetime</span><span class="p">(</span>
+  <span class="mi">2004</span><span class="p">,</span> <span 
class="mi">12</span><span class="p">,</span> <span class="mi">13</span><span 
class="p">,</span> <span class="mi">21</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/Mountain'</span><span class="p">))</span>
+<span class="n">first_event_response</span> <span class="o">=</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">"my_event"</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">=</span><span 
class="s">"uid"</span><span class="p">,</span>
+    <span class="n">properties</span><span class="o">=</span><span 
class="n">first_event_properties</span><span class="p">,</span>
+    <span class="n">event_time</span><span class="o">=</span><span 
class="n">first_event_time</span><span class="p">,</span>
+<span class="p">)</span>
+</pre></td></tr></tbody></table> </div> </div></div></div></div><footer><div 
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+<!DOCTYPE html><html><head><title>Level 1</title><meta charset="utf-8"/><meta 
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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="/datacollection/eventapi/"><span>Collecting Data with 
 >REST/SDKs</span></a></li><li class="level-2"><a class="final" 
 >href="/datacollection/eventmodel/"><span>Events Modeling</span></a></li><li 
 >class="level-2"><a class="final" 
 >href="/datacollection/webhooks/"><span>Unifying Multichannel Data with 
 >Webhooks</span></a></li><li class="level-2"><a class="final" 
 >href="/datacollection/channel/"><span>Channel</span></a></li><li 
 >class="level-2"><a class="final" 
 >href="/datacollection/batchimport/"><span>Importing Data in 
 >Batch</span></a></li><li class="level-2"><a class="final" 
 >href="/datacollection/analytics/"><span>Using Analytics 
 >Tools</span></a></li></ul></li><li class="level-1"><a class="expandible" 
 >href="#"><span>Choosing an Algorithm(s)</span></a><ul><li class="level-2"><a 
 >class="final" href="/algorithm/"><span>Built-in Algorithm 
 >Libraries</span></a></li><li class="level-2"><a class="final" 
 >href="/algorithm/switch/"><span>Switching to Anot
 her 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 Archit
 ecture</span></a><ul><li class="level-2"><a class="final" 
href="/system/"><span>Architecture Overview</span></a></li><li 
class="level-2"><a class="final" href="/system/anotherdatastore/"><span>Using 
Another Data Store</span></a></li></ul></li><li class="level-1"><a 
class="expandible" href="#"><span>PredictionIO Official 
Templates</span></a><ul><li class="level-2"><a class="final" 
href="/templates/"><span>Intro</span></a></li><li class="level-2"><a 
class="expandible" href="#"><span>Recommendation</span></a><ul><li 
class="level-3"><a class="final" 
href="/templates/recommendation/quickstart/"><span>Quick 
Start</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/dase/"><span>DASE</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/recommendation/evaluation/"><span>Evaluation 
Explained</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/how-to/"><span>How-To</span></a></li><li 
class="level-3"><a class="final
 " href="/templates/recommendation/reading-custom-events/"><span>Read Custom 
Events</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/customize-data-prep/"><span>Customize Data 
Preparator</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/customize-serving/"><span>Customize 
Serving</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/training-with-implicit-preference/"><span>Train 
with Implicit Preference</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/blacklist-items/"><span>Filter Recommended 
Items by Blacklist in Query</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/batch-evaluator/"><span>Batch Persistable 
Evaluator</span></a></li></ul></li><li class="level-2"><a class="expandible" 
href="#"><span>E-Commerce Recommendation</span></a><ul><li class="level-3"><a 
class="final" href="/templates/ecommercerecommendation/
 quickstart/"><span>Quick Start</span></a></li><li class="level-3"><a 
class="final" 
href="/templates/ecommercerecommendation/dase/"><span>DASE</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/how-to/"><span>How-To</span></a></li><li
 class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/train-with-rate-event/"><span>Train 
with Rate Event</span></a></li><li class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/adjust-score/"><span>Adjust 
Score</span></a></li></ul></li><li class="level-2"><a class="expandible" 
href="#"><span>Similar Product</span></a><ul><li class="level-3"><a 
class="final" href="/templates/similarproduct/quickstart/"><span>Quick 
Start</span></a></li><li class="level-3"><a class="final" 
href="/templates/similarproduct/dase/"><span>DASE</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/similarproduct/how-to/"><span>How-To</span></a></li><li 
class="level-3"><a class="fin
 al" href="/templates/similarproduct/multi-events-multi-algos/"><span>Multiple 
Events and Multiple Algorithms</span></a></li><li class="level-3"><a 
class="final" 
href="/templates/similarproduct/return-item-properties/"><span>Returns Item 
Properties</span></a></li><li class="level-3"><a class="final" 
href="/templates/similarproduct/train-with-rate-event/"><span>Train with Rate 
Event</span></a></li><li class="level-3"><a class="final" 
href="/templates/similarproduct/rid-user-set-event/"><span>Get Rid of Events 
for Users</span></a></li><li class="level-3"><a class="final" 
href="/templates/similarproduct/recommended-user/"><span>Recommend 
Users</span></a></li></ul></li><li class="level-2"><a class="expandible" 
href="#"><span>Classification</span></a><ul><li class="level-3"><a 
class="final" href="/templates/classification/quickstart/"><span>Quick 
Start</span></a></li><li class="level-3"><a class="final" 
href="/templates/classification/dase/"><span>DASE</span></a></li><li 
class="level-3"><
 a class="final" 
href="/templates/classification/how-to/"><span>How-To</span></a></li><li 
class="level-3"><a class="final" 
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 class="col-md-9 col-sm-12"><div class="content-header hidden-md 
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class="content-header hidden-sm hidden-xs"><div id="page-title"><h1>Level 
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(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 
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href="/batchpredict/"><span>Batch Predictions</span></a></li><li 
class="level-2"><a class="final" href="/deploy/monitoring/"><spa
 n>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 
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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" 
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APIs</span></a></li></ul></li><li class="level-1"><a class="expandible" 
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class="level-2"><a class="final" href="/datacollection/"><span>Event Server 
Overview</
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href="/datacollection/eventapi/"><span>Collecting Data with 
REST/SDKs</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/eventmodel/"><span>Events Modeling</span></a></li><li 
class="level-2"><a class="final" 
href="/datacollection/webhooks/"><span>Unifying Multichannel Data with 
Webhooks</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/channel/"><span>Channel</span></a></li><li 
class="level-2"><a class="final" 
href="/datacollection/batchimport/"><span>Importing Data in 
Batch</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/analytics/"><span>Using Analytics 
Tools</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Choosing an Algorithm(s)</span></a><ul><li class="level-2"><a 
class="final" href="/algorithm/"><span>Built-in Algorithm 
Libraries</span></a></li><li class="level-2"><a class="final" 
href="/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>Syste
 m Architecture</span></a><ul><li class="level-2"><a class="final" 
href="/system/"><span>Architecture Overview</span></a></li><li 
class="level-2"><a class="final" href="/system/anotherdatastore/"><span>Using 
Another Data Store</span></a></li></ul></li><li class="level-1"><a 
class="expandible" href="#"><span>PredictionIO Official 
Templates</span></a><ul><li class="level-2"><a class="final" 
href="/templates/"><span>Intro</span></a></li><li class="level-2"><a 
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class="level-3"><a class="final" 
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Start</span></a></li><li class="level-3"><a class="final" 
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Explained</span></a></li><li class="level-3"><a class="final" 
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class="level-3"><a clas
 s="final" href="/templates/recommendation/reading-custom-events/"><span>Read 
Custom Events</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/customize-data-prep/"><span>Customize Data 
Preparator</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/customize-serving/"><span>Customize 
Serving</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/training-with-implicit-preference/"><span>Train 
with Implicit Preference</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/blacklist-items/"><span>Filter Recommended 
Items by Blacklist in Query</span></a></li><li class="level-3"><a class="final" 
href="/templates/recommendation/batch-evaluator/"><span>Batch Persistable 
Evaluator</span></a></li></ul></li><li class="level-2"><a class="expandible" 
href="#"><span>E-Commerce Recommendation</span></a><ul><li class="level-3"><a 
class="final" href="/templates/ecommercerecomme
 ndation/quickstart/"><span>Quick Start</span></a></li><li class="level-3"><a 
class="final" 
href="/templates/ecommercerecommendation/dase/"><span>DASE</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/how-to/"><span>How-To</span></a></li><li
 class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/train-with-rate-event/"><span>Train 
with Rate Event</span></a></li><li class="level-3"><a class="final" 
href="/templates/ecommercerecommendation/adjust-score/"><span>Adjust 
Score</span></a></li></ul></li><li class="level-2"><a class="expandible" 
href="#"><span>Similar Product</span></a><ul><li class="level-3"><a 
class="final" href="/templates/similarproduct/quickstart/"><span>Quick 
Start</span></a></li><li class="level-3"><a class="final" 
href="/templates/similarproduct/dase/"><span>DASE</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/similarproduct/how-to/"><span>How-To</span></a></li><li 
class="level-3"><a cl
 ass="final" 
href="/templates/similarproduct/multi-events-multi-algos/"><span>Multiple 
Events and Multiple Algorithms</span></a></li><li class="level-3"><a 
class="final" 
href="/templates/similarproduct/return-item-properties/"><span>Returns Item 
Properties</span></a></li><li class="level-3"><a class="final" 
href="/templates/similarproduct/train-with-rate-event/"><span>Train with Rate 
Event</span></a></li><li class="level-3"><a class="final" 
href="/templates/similarproduct/rid-user-set-event/"><span>Get Rid of Events 
for Users</span></a></li><li class="level-3"><a class="final" 
href="/templates/similarproduct/recommended-user/"><span>Recommend 
Users</span></a></li></ul></li><li class="level-2"><a class="expandible" 
href="#"><span>Classification</span></a><ul><li class="level-3"><a 
class="final" href="/templates/classification/quickstart/"><span>Quick 
Start</span></a></li><li class="level-3"><a class="final" 
href="/templates/classification/dase/"><span>DASE</span></a></li><li class="le
 vel-3"><a class="final" 
href="/templates/classification/how-to/"><span>How-To</span></a></li><li 
class="level-3"><a class="final" 
href="/templates/classification/add-algorithm/"><span>Use Alternative 
Algorithm</span></a></li><li class="level-3"><a class="final" 
href="/templates/classification/reading-custom-properties/"><span>Read Custom 
Properties</span></a></li></ul></li></ul></li><li class="level-1"><a 
class="expandible" href="#"><span>Engine Template Gallery</span></a><ul><li 
class="level-2"><a class="final" 
href="/gallery/template-gallery/"><span>Browse</span></a></li><li 
class="level-2"><a class="final" 
href="/community/submit-template/"><span>Submit your Engine as a 
Template</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Demo Tutorials</span></a><ul><li class="level-2"><a 
class="final" href="/demo/tapster/"><span>Comics Recommendation 
Demo</span></a></li><li class="level-2"><a class="final" 
href="/demo/community/"><span>Community Contributed
  Demo</span></a></li><li class="level-2"><a class="final" 
href="/demo/textclassification/"><span>Text Classification Engine 
Tutorial</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="/community/"><span>Getting Involved</span></a><ul><li class="level-2"><a 
class="final" 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="/cli/"><span>Command-line Interface</span></a></li><li 
 >class="level-2"><a class="final" href="/resources/release/"><span>Release 
 >Cadence</span></a></li><li class="level-2"><a class="final" 
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