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<h1>PersistentModel</h1><h3><span class="morelinks"><div>Related Doc:
<a href="package.html" class="extype" name="org.apache.predictionio.controller">package controller</a>
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<span class="name">PersistentModel</span><span class="tparams">[<span name="AP">AP &lt;: <a href="Params.html" class="extype" name="org.apache.predictionio.controller.Params">Params</a></span>]</span><span class="result"> extends <span class="extype" name="scala.AnyRef">AnyRef</span></span>
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<div id="comment" class="fullcommenttop"><div class="comment cmt"><p>Mix in and implement this trait if your model cannot be persisted by
PredictionIO automatically. A companion object extending
IPersistentModelLoader is required for PredictionIO to load the persisted
model automatically during deployment.</p><p>Notice that models generated by <a href="PAlgorithm.html" class="extype" name="org.apache.predictionio.controller.PAlgorithm">PAlgorithm</a> cannot be persisted
automatically by nature and must implement these traits if model persistence
is desired.</p><pre><span class="kw">class</span> MyModel <span class="kw">extends</span> PersistentModel[MyParams] {
<span class="kw">def</span> save(id: <span class="std">String</span>, params: MyParams, sc: SparkContext): <span class="std">Boolean</span> = {
...
}
}
<span class="kw">object</span> MyModel <span class="kw">extends</span> PersistentModelLoader[MyParams, MyModel] {
<span class="kw">def</span> apply(id: <span class="std">String</span>, params: MyParams, sc: <span class="std">Option</span>[SparkContext]): MyModel = {
...
}
}</pre><p>In Java, all you need to do is to implement this interface, and add a static
method with 3 arguments of type String, <a href="Params.html" class="extype" name="org.apache.predictionio.controller.Params">Params</a>, and SparkContext.</p><pre>public <span class="kw">class</span> MyModel implements PersistentModel&lt;MyParams&gt;, Serializable {
...
public boolean save(<span class="std">String</span> id, MyParams params, SparkContext sc) {
...
}
public static MyModel load(<span class="std">String</span> id, Params params, SparkContext sc) {
...
}
...
}</pre></div><dl class="paramcmts block"><dt class="tparam">AP</dt><dd class="cmt"><p>Algorithm parameters class.</p></dd></dl><dl class="attributes block"> <dt>See also</dt><dd><span class="cmt"><p><a href="PersistentModelLoader.html" class="extype" name="org.apache.predictionio.controller.PersistentModelLoader">PersistentModelLoader</a></p></span></dd></dl><div class="toggleContainer block">
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<p class="shortcomment cmt">Save the model to some persistent storage.</p><div class="fullcomment"><div class="comment cmt"><p>Save the model to some persistent storage.</p><p>This method should return true if the model has been saved successfully so
that PredictionIO knows that it can be restored later during deployment.
This method should return false if the model cannot be saved (or should
not be saved due to configuration) so that PredictionIO will re-train the
model during deployment. All arguments of this method are provided by
automatically by PredictionIO.
</p></div><dl class="paramcmts block"><dt class="param">id</dt><dd class="cmt"><p>ID of the run that trained this model.</p></dd><dt class="param">params</dt><dd class="cmt"><p>Algorithm parameters that were used to train this model.</p></dd><dt class="param">sc</dt><dd class="cmt"><p>An Apache Spark context.</p></dd></dl></div>
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