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id="page-title"><h1>Switching to Another Algorithm</h1></div></div><div 
class="content"> <p>Every engine template comes with default algorithm(s). To 
switch to another algorithm, you simply need to modify the Algorithm 
class.</p><p>Here are some How-to examples:</p> <ul> <li><a 
href="/templates/classification/add-algorithm/">Classification template - 
switching from NaiveBayes to Random Forests</a></li> </ul> 
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class="content"> <p>Every engine template comes with default algorithm(s). To 
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class="level-1"><a class="expandible" href="#"><span>Customizing an 
Engine</span></a><ul><li class="level-2"><a class="final" 
href="/customize/"><span>Learning DASE</span></a></li><li class="level-2"><a 
class="final" href="/customize/dase/"><span>Implement DASE</span></a></li><li 
class="level-2"><a class="final" 
href="/customize/troubleshooting/"><span>Troubleshooting Engine 
Development</span></a></li><li class="level-2"><a class="final" 
href="/api/current/#package"><span>Engine Scala 
APIs</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Collecting and 
 Analyzing Data</span></a><ul><li class="level-2"><a class="final" 
href="/datacollection/"><span>Event Server Overview</span></a></li><li 
class="level-2"><a class="final" 
href="/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><li class="level-2"><a class="final" 
href="/datacollection/plugin/"><span>Event Server 
Plugin</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" 
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Algorithm</span></a></li><li class="level-2"><a class="final" 
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class="final" href="/evaluation/"><span>Overview</span></a></li><li 
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class="level-2"><a class="final" 
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Dashboard</span></a></li><li class="level-2"><a class="final" 
href="/evaluation/metricchoose/"><span>Choos
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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 
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class="level-3"><a clas
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class="level-3"><a class="final" 
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Start</span></a></li><li
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class="level-3"><a class="final" 
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Properties</span></a></li><li class="level-3"><a class="final" 
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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>
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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 
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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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Properties</span></a></li></ul></li></ul></li><li class="level-1"><a 
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Template</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#">
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href="/demo/tapster/"><span>Comics Recommendation Demo</span></a></li><li 
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Contributed Demo</span></a></li><li class="level-2"><a class="final" 
href="/demo/textclassification/"><span>Text Classification Engine 
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IDEA</span></a></li><li class="level-2"><a class="final" 
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Overview</span></li></ul></div><div id="page-title"><h1>App Integration 
Overview</h1></div></div><div id="tabl
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Integration Overview</span></li></ul></div><div id="page-title"><h1>App 
Integration Overview</h1></div></div><div class="content"> <p>Apache 
PredictionIO is designed as a machine learning server that integrates with your 
applications on production environments.</p><p>A web or mobile app 
normally:</p> <ol> <li> Send event data to Apache PredictionIO&#39;s
  Event Server for model training</li> <li> Send dynamic queries to deployed 
engine(s) to retrieve predicted results</li> </ol> <p><img alt="Apache 
PredictionIO Single Engine Overview" 
src="/images/overview-singleengine-0a99200d.png"/></p><h2 
id='sending-event-data' class='header-anchors'>Sending Event Data</h2><p>Apache 
PredictionIO&#39;s Event Server receives event data from your application. The 
data can be used by engines as training data to build preditive 
models.</p><p>Event Server listens to port 7070 by default. You can change the 
port with the <a href="/cli/#event-server-commands">--port arg</a> when you 
launch the Event Server.</p><p>For further information, please read:</p> <ul> 
<li><a href="/datacollection/">Event Server Overview</a></li> <li><a 
href="/datacollection/eventapi">Collecting Data with REST/SDKs</a></li> </ul> 
<h2 id='sending-query' class='header-anchors'>Sending Query</h2><p>After you 
deploy an engine as a web service, it will wait for queries from your appli
 cation and return predicted results in JSON format. An engine listens to port 
8000 by default. If you want to deploy multiple engines, you can specific a 
different port for each of them.</p><p>For further information, please 
read:</p> <ul> <li><a href="/deploy/">Deploying an Engine as a Web 
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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</span></a></li><li class="level-2"><a class="final" 
href="/start/download/"><span>Downloading an Engine Template</span></a></li><li 
class="level-2"><a class="final" href="/start/deploy/"><span>Deploying Your 
First Engine</span></a></li><li class="level-2"><a class="final" 
href="/start/customize/"><span>Customizing the 
Engine</span></a></li></ul></li><li class="level-1"><a class="expandible" 
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 class="final active" href="/appintegration/"><span>App Integration 
Overview</span></a></li><li class="level-2"><a class="expandible" 
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SDK</span></a></li><li class="level-3"><a class="final" 
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SDKs</span></a></li></ul></li></ul></li><li class="level-1"><a 
class="expandible" href="#"><span>Deploying an Engine</span></a><ul><li 
class="level-2"><a class="final" href="/deploy/"><span>Deploying as a Web 
Service</span></a></li><li class="level-2"><a class="final" 
href="/batchpredict/"><span>Batch Predictions</span></a></li><li 
class="level-2"><a class="final" href="/deploy/m
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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 
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href="/deploy/plugin/"><span>Engine Server Plugin</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 
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Development</span></a></li><li class="level-2"><a class="final" 
href="/api/current/#package"><span>Engine Scala 
APIs</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><span>Collecting and A
 nalyzing 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><li class="level-2"><a class="final" 
href="/datacollection/plugin/"><span>Event Server 
Plugin</span></a></li></ul></li><li class="level-1"><a class="expandible" 
href="#"><s
 pan>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 
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PredictionIO is designed as a machine learning server that integrates with your 
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engine(s) to retrieve predicted results</li> </ol> <p><img alt="Apache 
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<h2 id='sending-query' class='header-anchors'>Sending Query</h2><p>After you 
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