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plates/recommendation/batch-evaluator/"><span>Batch Persistable
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id="page-title"><h1>Developing Eng
ines with IntelliJ IDEA</h1></div></div><div
id="table-of-content-wrapper"><h5>On this page</h5><aside
id="table-of-contents"><ul> <li> <a href="#prerequisites">Prerequisites</a>
</li> <li> <a href="#preparing-intellij-for-engine-development">Preparing
IntelliJ for Engine Development</a> </li> <li> <a
href="#running-and-debugging-in-intellij-idea">Running and Debugging in
IntelliJ IDEA</a> </li> <li> <a
href="#loading-a-template-into-intellij-idea">Loading a Template Into Intellij
IDEA</a> </li> </ul> </aside><hr/><a id="edit-page-link"
href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/resources/intellij.html.md.erb";><img
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page-title"><h1>Developing Engines with IntelliJ IDEA</h1></div></div><div
class="content"> <h2 id='prerequisites'
class='header-anchors'>Prerequisites</h2><p>This documentation assumes that you
have a fully functional PredictionIO setup. If you have not installed
PredictionIO yet, please follow <a href="/install/">these
instructions</a>.</p><h2 id='preparing-intellij-for-engine-development'
class='header-anchors'>Preparing IntelliJ for Engine Development</h2><h3
id='installing-intellij-scala-plugin' class='header-anchors'>Installing
IntelliJ Scala Plugin</h3><p>First of all, you will need to install the <a
href="https://plugins.jetbrains.com/plugin/?id=1347";>Scala plugin</a> if you
have not already done so.</p><p>Go to the <em>Preferences</em> menu item, and
look for <em>Plugins</em>. You should see the following screen.</p><p><img
alt="IntelliJ Plugins"
src="/images/intellij/intelliJ-scala-plugin-09ee074a.png"/></p><p>Click
<em>Install JetBrains plugin...</em>, the search for <em>
Scala</em>. You should arrive at something similar to the
following.</p><p><img alt="Scala Plugin"
src="/images/intellij/intellij-scala-plugin-2-592c697f.png"/></p><p>Click the
green <em>Install plugin</em> button to install the plugin. Restart IntelliJ
IDEA if asked to do so.</p><h3 id='setting-up-the-engine-directory'
class='header-anchors'>Setting Up the Engine Directory</h3><div
class="alert-message info"><p>It is very important to run at least <code>pio
build</code> once in your engine directory so that the project correctly
recognizes the version of PredictionIO that you are using. If you upgraded your
PredictionIO installation later, you will need to run <code>pio build</code>
again in order for the engine to pick up the latest version of
PredictionIO.</p></div><p>Create an engine directory from a template. This
requires that you install a template that you wish to start from or modify.
Follow template <a href="/start/download">install</a> and <a
href="/start/deploy">deploy</
a> instructions or go through the <a
href="/templates/recommendation/quickstart/">Quick Start</a> if you are
planning to modify a recommender. Make sure to build, train, and deploy the
engine to make sure all is configured properly.</p><p>From IntelliJ IDEA,
choose <em>File</em> > <em>New</em> > <em>Project from Existing
Sources...</em>. When asked to select a directory to import, browse to the
engine directory that you downloaded too and proceed. Make sure you pick
<em>Import project from external model</em> > <em>SBT</em>, then proceed to
finish.</p><p>You should be able to build the project at this point. To run and
debug PredictionIO server, continue on to the rest of the steps.</p><div
class="alert-message info"><p>If you are running on OS X, you will need to do
the following due to this <a href="http://bit.ly/12Abtvn";>known
issue</a>.</p></div><p>Edit <code>build.sbt</code> and add the following under
<code>libraryDependencies</code></p><div class="highlight shell"><t
able 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="s2">"org.xerial.snappy"</span> % <span
class="s2">"snappy-java"</span> % <span class="s2">"1.1.1.7"</span>
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>id="nav-main"><ul><li class="level-1"><a class="expandible"
>href="/"><span>Apache PredictionIO® Documentation</span></a><ul><li
>class="level-2"><a class="final" href="/"><span>Welcome to Apache
>PredictionIO®</span></a></li></ul></li><li class="level-1"><a
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ble" href="#"><span>Collecting and Analyzing Data</span></a><ul><li
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href="/datacollection/eventapi/"><span>Collecting Data with
REST/SDKs</span></a></li><li class="level-2"><a class="final"
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href="/datacollection/channel/"><span>Channel</span></a></li><li
class="level-2"><a class="final"
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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" 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="/ev
aluation/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>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="/temp
lates/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="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="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"
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"
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class="level-2"><a class="final" href="/demo/textclassification/"><span>Text
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el-2"><a class="final" href="/community/projects/"><span>Community
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hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a
href="#">Resources</a><span class="spacer">></span></li><li><span
class="last">Developing Engines with IntelliJ IDEA</span></li></ul></div><div
id="page-title"><h1>Developing Engi
nes with IntelliJ IDEA</h1></div></div><div
id="table-of-content-wrapper"><h5>On this page</h5><aside
id="table-of-contents"><ul> <li> <a href="#prerequisites">Prerequisites</a>
</li> <li> <a href="#preparing-intellij-for-engine-development">Preparing
IntelliJ for Engine Development</a> </li> <li> <a
href="#running-and-debugging-in-intellij-idea">Running and Debugging in
IntelliJ IDEA</a> </li> <li> <a
href="#loading-a-template-into-intellij-idea">Loading a Template Into Intellij
IDEA</a> </li> </ul> </aside><hr/><a id="edit-page-link"
href="https://github.com/apache/incubator-predictionio/tree/livedoc/docs/manual/source/resources/intellij.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="breadcrumbs"
class="hidden-sm hidden xs"><ul><li><a href="#">Resources</a><span
class="spacer">></span></li><li><span class="last">Developing Engines with
IntelliJ IDEA</span></li></ul></div><div id="p
age-title"><h1>Developing Engines with IntelliJ IDEA</h1></div></div><div
class="content"> <h2 id='prerequisites'
class='header-anchors'>Prerequisites</h2><p>This documentation assumes that you
have a fully functional PredictionIO setup. If you have not installed
PredictionIO yet, please follow <a href="/install/">these
instructions</a>.</p><h2 id='preparing-intellij-for-engine-development'
class='header-anchors'>Preparing IntelliJ for Engine Development</h2><h3
id='installing-intellij-scala-plugin' class='header-anchors'>Installing
IntelliJ Scala Plugin</h3><p>First of all, you will need to install the <a
href="https://plugins.jetbrains.com/plugin/?id=1347";>Scala plugin</a> if you
have not already done so.</p><p>Go to the <em>Preferences</em> menu item, and
look for <em>Plugins</em>. You should see the following screen.</p><p><img
alt="IntelliJ Plugins"
src="/images/intellij/intelliJ-scala-plugin-09ee074a.png"/></p><p>Click
<em>Install JetBrains plugin...</em>, the search for <em>S
cala</em>. You should arrive at something similar to the following.</p><p><img
alt="Scala Plugin"
src="/images/intellij/intellij-scala-plugin-2-592c697f.png"/></p><p>Click the
green <em>Install plugin</em> button to install the plugin. Restart IntelliJ
IDEA if asked to do so.</p><h3 id='setting-up-the-engine-directory'
class='header-anchors'>Setting Up the Engine Directory</h3><div
class="alert-message info"><p>It is very important to run at least <code>pio
build</code> once in your engine directory so that the project correctly
recognizes the version of PredictionIO that you are using. If you upgraded your
PredictionIO installation later, you will need to run <code>pio build</code>
again in order for the engine to pick up the latest version of
PredictionIO.</p></div><p>Create an engine directory from a template. This
requires that you install a template that you wish to start from or modify.
Follow template <a href="/start/download">install</a> and <a
href="/start/deploy">deploy</a
> instructions or go through the <a
> href="/templates/recommendation/quickstart/">Quick Start</a> if you are
> planning to modify a recommender. Make sure to build, train, and deploy the
> engine to make sure all is configured properly.</p><p>From IntelliJ IDEA,
> choose <em>File</em> > <em>New</em> > <em>Project from Existing
> Sources...</em>. When asked to select a directory to import, browse to the
> engine directory that you downloaded too and proceed. Make sure you pick
> <em>Import project from external model</em> > <em>SBT</em>, then proceed
> to finish.</p><p>You should be able to build the project at this point. To
> run and debug PredictionIO server, continue on to the rest of the
> steps.</p><div class="alert-message info"><p>If you are running on OS X, you
> will need to do the following due to this <a
> href="http://bit.ly/12Abtvn";>known issue</a>.</p></div><p>Edit
> <code>build.sbt</code> and add the following under
> <code>libraryDependencies</code></p><div class="highlight shell"><ta
ble 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="s2">"org.xerial.snappy"</span> % <span
class="s2">"snappy-java"</span> % <span class="s2">"1.1.1.7"</span>
</pre></td></tr></tbody></table> </div> <p><img alt="Updating build.sbt"
src="/images/intellij/intellij-buildsbt-05cfd141.png"/></p><p>When you are done
editing, IntelliJ should either refresh the project automatically or prompt you
to refresh.</p><h3 id='dependencies'
class='header-anchors'>Dependencies</h3><p>IntelliJ has the annoying tendency
to drop some dependencies when you refresh your build.sbt after any changes. To
avoid this we put any jars that must be available at runtime into a separate
empty module in the project then we make the main engine project depend on this
dummy module for runtime classes.</p><p>Right click on the project and click
<em>Open Module Settings</em>. In the second modules column hit
<strong>+</strong> and create a new Scala module. Name it pio-runtime-jars and
add these assemblies under the module dependencies tab and remember to change
the scope of the jars to <strong>runtime</strong>:</p> <ul> <li><p>
<code>pio-assembly-0.12.0-incubating.jar</code
></p><p>This JAR can be found inside the <code>assembly</code> or
><code>lib</code> directory of your PredictionIO installation
>directory.</p></li> <li><p>
><code>spark-assembly-2.1.1-hadoop2.4.0.jar</code></p><p>This JAR can be found
>inside the <code>assembly</code> or <code>lib</code> directory of your Apache
>Spark installation directory.</p></li> </ul> <p><img alt="Create empty module
>and add dependencies"
>src="/images/intellij/pio-runtime-jar-deps-3f3c99d9.png"/></p><p>Now make
>your engine module dependent on the pio-runtime-jars module for scope =
>runtime.</p><p><img alt="Create empty module and add dependencies"
>src="/images/intellij/pio-runtime-jars-266e8c1b.png"/></p><h2
>id='running-and-debugging-in-intellij-idea' class='header-anchors'>Running
>and Debugging in IntelliJ IDEA</h2><h3 id='simulating-<code>pio-train</code>'
>class='header-anchors' >Simulating <code>pio train</code></h3><p>Create a new
><em>Run/Debug Configuration</em> by going to <em>Run</em> > <em>Edit
>Configur
ations...</em>. Click on the <strong>+</strong> button and select
<em>Application</em>. Name it <code>pio train</code> and put in 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
3</pre></td><td class="code"><pre>Main class:
org.apache.predictionio.workflow.CreateWorkflow
@@ -61,7 +61,7 @@ Program Arguments: --engineInstanceId <span
class="k">**</span>replace_with_the_
<span class="o">]}</span>
</pre></td></tr></tbody></table> </div> <div class="alert-message info"><p>If
you hit a breakpoint you are likely to get a connection timeout. To see the
data that would have been returned, just place a breakpoint where the response
is created or run the query with no breakpoints.</p></div><h2
id='loading-a-template-into-intellij-idea' class='header-anchors'>Loading a
Template Into Intellij IDEA</h2><p>To customize an existing <a
href="/gallery/template-gallery">template</a> using Intellij IDEA, first pull
it from the template gallery:</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>git clone <Template Source> <New Engine Directory>
</pre></td></tr></tbody></table> </div> <p>Now, before opening the template
with Intellij, run the following command in the new engine template
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>pio
build
-</pre></td></tr></tbody></table> </div> <p>This should update the pioVersion
key in SBT to the version of PredictionIO you have installed, so that Intellij
loads the correct JARS via its Auto-Import feature. Now, you can go ahead and
open the file <code>build.sbt</code> with Intellij IDEA. You are now ready to
<a href="/customize/">customize</a> your new engine
template.</p></div></div></div></div><footer><div class="container"><div
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