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 class="col-md-9 col-sm-12"><div class="content-header hidden-md 
hidden-lg"><div id="page-title"><h1>DASE Components Explained (Complementary 
Purchase)</h1></div></div><div id="table-of-content-wrapper"><h5>On this 
page</h5><aside id="table-of-contents"><ul> <li> <a 
href="#the-engine-design">The Engine Design</a> </li>
  <li> <a href="#data">Data</a> </li> <li> <a href="#algorithm">Algorithm</a> 
</li> <li> <a href="#serving">Serving</a> </li> </ul> </aside><hr/><a 
id="edit-page-link" 
href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/templates/complementarypurchase/dase.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>DASE 
Components Explained (Complementary Purchase)</h1></div></div><div 
class="content"><p>PredictionIO&#39;s DASE architecture brings the 
separation-of-concerns design principle to predictive engine development. DASE 
stands for the following components of an engine:</p> <ul> 
<li><strong>D</strong>ata - includes Data Source and Data Preparator</li> 
<li><strong>A</strong>lgorithm(s)</li> <li><strong>S</strong>erving</li> 
<li><strong>E</strong>valuator</li> </ul> <p><p>Let&#39;s look at the code and 
see how you can customize the engine you b
 uilt from the Complementary Purchase Engine Template.</p><div 
class="alert-message note"><p>Evaluator will not be covered in this 
tutorial.</p></div></p><h2 id='the-engine-design' class='header-anchors'>The 
Engine Design</h2><p>As you can see from the Quick Start, 
<em>MyComplementaryPurchase</em> takes a JSON prediction query, e.g. <code>{ 
&quot;items&quot; : [&quot;s2i1&quot;], &quot;num&quot; : 3 }</code>, and 
return a JSON predicted result. In 
MyComplementaryPurchase/src/main/scala/<strong><em>Engine.scala</em></strong>, 
the <code>Query</code> case class defines the format of such 
<strong>query</strong>:</p><div class="highlight scala"><table 
style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: 
right"><pre class="lineno">1
+<!DOCTYPE html><html><head><title>DASE Components Explained (Complementary 
Purchase)</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="DASE Components Explained 
(Complementary Purchase)"/><link rel="canonical" 
href="https://docs.prediction.io/templates/complementarypurchase/dase/"/><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"
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rel="stylesheet"/><link href="/stylesheets/application-a2a2f408.css" 
rel="stylesheet" type="text/css"/><script 
src="//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.2/h
 tml5shiv.min.js"></script><script 
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id="pill-wrapper"><a class="pill left" 
href="/gallery/template-gallery">TEMPLATES</a> <a class="pill right" 
href="//github.com/apache/incubator-predictionio/">OPEN 
SOURCE</a></div></div><img class="mobile-search-bar-toggler hidden-md 
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Components Explained (Complementary Purchase)</h4></div><h4 class="hidden-sm 
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href="#"><span>Getting Started</span></a><ul><li class="level-2"><a 
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href="/start/download/"><span>Downloading an Engine Template</span></a></li><li 
class="level-2"><a class="final" href="/start/deploy/"><span>Deploying Your 
First Engine</span></a></li><li class="level-2"><a class="final" 
href="/start/customize/"><span>Customizing the 
Engine</span></a></li></ul></li><l
 i class="level-1"><a class="expandible" href="#"><span>Integrating with Your 
App</span></a><ul><li class="level-2"><a class="final" 
href="/appintegration/"><span>App Integration Overview</span></a></li><li 
class="level-2"><a class="expandible" href="/sdk/"><span>List of 
SDKs</span></a><ul><li class="level-3"><a class="final" 
href="/sdk/java/"><span>Java & Android SDK</span></a></li><li 
class="level-3"><a class="final" href="/sdk/php/"><span>PHP 
SDK</span></a></li><li class="level-3"><a class="final" 
href="/sdk/python/"><span>Python SDK</span></a></li><li class="level-3"><a 
class="final" href="/sdk/ruby/"><span>Ruby SDK</span></a></li><li 
class="level-3"><a class="final" href="/sdk/community/"><span>Community Powered 
SDKs</span></a></li></ul></li></ul></li><li class="level-1"><a 
class="expandible" href="#"><span>Deploying an Engine</span></a><ul><li 
class="level-2"><a class="final" href="/deploy/"><span>Deploying as a Web 
Service</span></a></li><li class="level-2"><a class="final" hr
 ef="/cli/#engine-commands"><span>Engine Command-line 
Interface</span></a></li><li class="level-2"><a class="final" 
href="/deploy/monitoring/"><span>Monitoring Engine</span></a></li><li 
class="level-2"><a class="final" href="/deploy/engineparams/"><span>Setting 
Engine Parameters</span></a></li><li class="level-2"><a class="final" 
href="/deploy/enginevariants/"><span>Deploying Multiple Engine 
Variants</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Customizing an Engine</span></a><ul><li class="level-2"><a 
class="final" href="/customize/"><span>Learning DASE</span></a></li><li 
class="level-2"><a class="final" href="/customize/dase/"><span>Implement 
DASE</span></a></li><li class="level-2"><a class="final" 
href="/customize/troubleshooting/"><span>Troubleshooting Engine 
Development</span></a></li><li class="level-2"><a class="final" 
href="/api/current/#package"><span>Engine Scala 
APIs</span></a></li></ul></li><li class="level-1"><a class="expandible" hre
 f="#"><span>Collecting and Analyzing Data</span></a><ul><li class="level-2"><a 
class="final" href="/datacollection/"><span>Event Server 
Overview</span></a></li><li class="level-2"><a class="final" 
href="/cli/#event-server-commands"><span>Event Server Command-line 
Interface</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/eventapi/"><span>Collecting Data with 
REST/SDKs</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/eventmodel/"><span>Events Modeling</span></a></li><li 
class="level-2"><a class="final" 
href="/datacollection/webhooks/"><span>Unifying Multichannel Data with 
Webhooks</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/channel/"><span>Channel</span></a></li><li 
class="level-2"><a class="final" 
href="/datacollection/batchimport/"><span>Importing Data in 
Batch</span></a></li><li class="level-2"><a class="final" 
href="/datacollection/analytics/"><span>Using Analytics 
Tools</span></a></li></ul></li><li c
 lass="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="fina
 l" href="/evaluation/metricchoose/"><span>Choosing Evaluation 
Metrics</span></a></li><li class="level-2"><a class="final" 
href="/evaluation/metricbuild/"><span>Building Evaluation 
Metrics</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>System Architecture</span></a><ul><li class="level-2"><a 
class="final" href="/system/"><span>Architecture Overview</span></a></li><li 
class="level-2"><a class="final" href="/system/anotherdatastore/"><span>Using 
Another Data Store</span></a></li></ul></li><li class="level-1"><a 
class="expandible" href="#"><span>Engine Template Gallery</span></a><ul><li 
class="level-2"><a class="final" 
href="/gallery/template-gallery/"><span>Browse</span></a></li><li 
class="level-2"><a class="final" 
href="/community/submit-template/"><span>Submit your Engine as a 
Template</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Demo Tutorials</span></a><ul><li class="level-2"><a 
class="final" href="/demo/tapste
 r/"><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 c
 lass="expandible" href="#"><span>Getting Help</span></a><ul><li 
class="level-2"><a class="final" 
href="/resources/faq/"><span>FAQs</span></a></li><li class="level-2"><a 
class="final" href="/support/"><span>Support</span></a></li></ul></li><li 
class="level-1"><a class="expandible" 
href="#"><span>Resources</span></a><ul><li class="level-2"><a class="final" 
href="/resources/intellij/"><span>Developing Engines with IntelliJ 
IDEA</span></a></li><li class="level-2"><a class="final" 
href="/resources/upgrade/"><span>Upgrade Instructions</span></a></li><li 
class="level-2"><a class="final" 
href="/resources/glossary/"><span>Glossary</span></a></li></ul></li></ul></nav></div><div
 class="col-md-9 col-sm-12"><div class="content-header hidden-md 
hidden-lg"><div id="page-title"><h1>DASE Components Explained (Complementary 
Purchase)</h1></div></div><div id="table-of-content-wrapper"><h5>On this 
page</h5><aside id="table-of-contents"><ul> <li> <a 
href="#the-engine-design">The Engine Design</a> </li> 
 <li> <a href="#data">Data</a> </li> <li> <a href="#algorithm">Algorithm</a> 
</li> <li> <a href="#serving">Serving</a> </li> </ul> </aside><hr/><a 
id="edit-page-link" 
href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/templates/complementarypurchase/dase.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>DASE 
Components Explained (Complementary Purchase)</h1></div></div><div 
class="content"><p>PredictionIO&#39;s DASE architecture brings the 
separation-of-concerns design principle to predictive engine development. DASE 
stands for the following components of an engine:</p> <ul> 
<li><strong>D</strong>ata - includes Data Source and Data Preparator</li> 
<li><strong>A</strong>lgorithm(s)</li> <li><strong>S</strong>erving</li> 
<li><strong>E</strong>valuator</li> </ul> <p><p>Let&#39;s look at the code and 
see how you can customize the engine you bu
 ilt from the Complementary Purchase Engine Template.</p><div 
class="alert-message note"><p>Evaluator will not be covered in this 
tutorial.</p></div></p><h2 id='the-engine-design' class='header-anchors'>The 
Engine Design</h2><p>As you can see from the Quick Start, 
<em>MyComplementaryPurchase</em> takes a JSON prediction query, e.g. <code>{ 
&quot;items&quot; : [&quot;s2i1&quot;], &quot;num&quot; : 3 }</code>, and 
return a JSON predicted result. In 
MyComplementaryPurchase/src/main/scala/<strong><em>Engine.scala</em></strong>, 
the <code>Query</code> case class defines the format of such 
<strong>query</strong>:</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</pre></td><td class="code"><pre><span class="k">case</span> <span 
class="k">class</span> <span class="nc">Query</span><span 
class="o">(</span><span class="n">items</span><span class="k">:</span> <span 
class="kt">Set</span><span class="o">[</span><span 
class="kt">String</span><span class="o">],</span> <span 
class="n">num</span><span class="k">:</span> <span class="kt">Int</span><span 
class="o">)</span>
   <span class="k">extends</span> <span class="nc">Serializable</span>
 </pre></td></tr></tbody></table> </div> <p>The <code>PredictedResult</code> 
case class defines the format of <strong>predicted result</strong>, such 
as</p><div class="highlight json"><table style="border-spacing: 
0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre 
class="lineno">1

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