org.apache.spark.mllib.regression

Class StreamingLinearAlgorithm<M extends GeneralizedLinearModel,A extends GeneralizedLinearAlgorithm<M>>

java.lang.Object

org.apache.spark.mllib.regression.StreamingLinearAlgorithm<M,A>

Direct Known Subclasses:

StreamingLinearRegressionWithSGD, StreamingLogisticRegressionWithSGD

public abstract class StreamingLinearAlgorithm<M extends GeneralizedLinearModel,A extends GeneralizedLinearAlgorithm<M>>
extends java.lang.Object

:: DeveloperApi :: StreamingLinearAlgorithm implements methods for continuously training a generalized linear model model on streaming data, and using it for prediction on (possibly different) streaming data.

This class takes as type parameters a GeneralizedLinearModel, and a GeneralizedLinearAlgorithm, making it easy to extend to construct streaming versions of any analyses using GLMs. Initial weights must be set before calling trainOn or predictOn. Only weights will be updated, not an intercept. If the model needs an intercept, it should be manually appended to the input data.

For example usage, see StreamingLinearRegressionWithSGD.

NOTE: In some use cases, the order in which trainOn and predictOn are called in an application will affect the results. When called on the same DStream, if trainOn is called before predictOn, when new data arrive the model will update and the prediction will be based on the new model. Whereas if predictOn is called first, the prediction will use the model from the previous update.

NOTE: It is ok to call predictOn repeatedly on multiple streams; this will generate predictions for each one all using the current model. It is also ok to call trainOn on different streams; this will update the model using each of the different sources, in sequence.

Constructor Summary

Constructors

Constructor and Description
StreamingLinearAlgorithm()

Method Summary

Methods

Modifier and Type	Method and Description
protected abstract A	algorithm() The algorithm to use for updating.
M	latestModel() Return the latest model.
protected abstract scala.Option<M>	model() The model to be updated and used for prediction.
DStream<java.lang.Object>	predictOn(DStream<Vector> data) Use the model to make predictions on batches of data from a DStream
JavaDStream<java.lang.Double>	predictOn(JavaDStream<Vector> data) Java-friendly version of predictOn.
<K> DStream<scala.Tuple2<K,java.lang.Object>>	predictOnValues(DStream<scala.Tuple2<K,Vector>> data, scala.reflect.ClassTag<K> evidence$1) Use the model to make predictions on the values of a DStream and carry over its keys.
<K> JavaPairDStream<K,java.lang.Double>	predictOnValues(JavaPairDStream<K,Vector> data) Java-friendly version of predictOnValues.
void	trainOn(DStream<LabeledPoint> data) Update the model by training on batches of data from a DStream.
void	trainOn(JavaDStream<LabeledPoint> data) Java-friendly version of trainOn.

Methods inherited from class java.lang.Object

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

Constructor Detail

StreamingLinearAlgorithm

public StreamingLinearAlgorithm()

Method Detail

model

protected abstract scala.Option<M> model()

The model to be updated and used for prediction.

algorithm

protected abstract A algorithm()

The algorithm to use for updating.

latestModel

public M latestModel()

Return the latest model.

Returns:

(undocumented)

trainOn

public void trainOn(DStream<LabeledPoint> data)

Update the model by training on batches of data from a DStream. This operation registers a DStream for training the model, and updates the model based on every subsequent batch of data from the stream.

Parameters:

data - DStream containing labeled data

trainOn

public void trainOn(JavaDStream<LabeledPoint> data)

Java-friendly version of trainOn.

Parameters:

data - (undocumented)

predictOn

public DStream<java.lang.Object> predictOn(DStream<Vector> data)

Use the model to make predictions on batches of data from a DStream

Parameters:

data - DStream containing feature vectors

Returns:

DStream containing predictions

predictOn

public JavaDStream<java.lang.Double> predictOn(JavaDStream<Vector> data)

Java-friendly version of predictOn.

Parameters:

data - (undocumented)

Returns:

(undocumented)

predictOnValues

public <K> DStream<scala.Tuple2<K,java.lang.Object>> predictOnValues(DStream<scala.Tuple2<K,Vector>> data,
                                                            scala.reflect.ClassTag<K> evidence$1)

Use the model to make predictions on the values of a DStream and carry over its keys.

Parameters:

data - DStream containing feature vectors

evidence$1 - (undocumented)

Returns:

DStream containing the input keys and the predictions as values

predictOnValues

public <K> JavaPairDStream<K,java.lang.Double> predictOnValues(JavaPairDStream<K,Vector> data)

Java-friendly version of predictOnValues.

Parameters:

data - (undocumented)

Returns:

(undocumented)