hex.genmodel

Class MojoReaderBackendFactory

java.lang.Object

hex.genmodel.MojoReaderBackendFactory

public class MojoReaderBackendFactory
extends java.lang.Object

Factory class for vending MojoReaderBackend object that can be used to load MOJOs from different data sources.

This class provides convenience methods for loading MOJOs from files, URLs (this includes classpath resources) and also from a generic InputStream source.

User needs to make a choice of a Caching Strategy for MOJO sources that are not file based. Available caching strategies:

• MEMORY: (decompressed) content of the MOJO will be cached in memory, this should be suitable for most cases (for very large models please make sure that your application has enough memory to hold the unpacked MOJO)
• DISK: MOJO is cached in a temporary file on disk, recommended for very large models

Example of using MojoReaderBackendFactory to read a MOJO from a classpath resource:

 
   public class ExampleApp {
     public static void main(String[] args) throws Exception {
       URL mojoURL = ExampleApp.class.getResource("/com/company/mojo.zip");
       MojoReaderBackend reader = MojoReaderBackendFactory.createReaderBackend(mojoURL, CachingStrategy.MEMORY);
       MojoModel model = ModelMojoReader.readFrom(reader);
       EasyPredictModelWrapper modelWrapper = new EasyPredictModelWrapper(model);
       RowData testRow = new RowData();
         for (int i = 0; i < args.length; i++)
           testRow.put("C"+i, Double.valueOf(args[i]));
       RegressionModelPrediction prediction = (RegressionModelPrediction) modelWrapper.predict(testRow);
       System.out.println("Prediction: " + prediction.value);
     }
   }
 
 

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MojoReaderBackendFactory.CachingStrategy

Constructor Summary

Constructors

Constructor and Description
MojoReaderBackendFactory()

Method Summary

Modifier and Type	Method and Description
static MojoReaderBackend	createReaderBackend(java.io.File file)
static MojoReaderBackend	createReaderBackend(java.io.InputStream inputStream, MojoReaderBackendFactory.CachingStrategy cachingStrategy)
static MojoReaderBackend	createReaderBackend(java.lang.String filename)
static MojoReaderBackend	createReaderBackend(java.net.URL url, MojoReaderBackendFactory.CachingStrategy cachingStrategy)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MojoReaderBackendFactory

public MojoReaderBackendFactory()

Method Detail

createReaderBackend

public static MojoReaderBackend createReaderBackend(java.lang.String filename)
                                             throws java.io.IOException

Throws:

java.io.IOException

createReaderBackend

public static MojoReaderBackend createReaderBackend(java.io.File file)
                                             throws java.io.IOException

Throws:

java.io.IOException

createReaderBackend

public static MojoReaderBackend createReaderBackend(java.net.URL url,
                                                    MojoReaderBackendFactory.CachingStrategy cachingStrategy)
                                             throws java.io.IOException

Throws:

java.io.IOException

createReaderBackend

public static MojoReaderBackend createReaderBackend(java.io.InputStream inputStream,
                                                    MojoReaderBackendFactory.CachingStrategy cachingStrategy)
                                             throws java.io.IOException

Throws:

java.io.IOException