moa.recommender.predictor

Class BaselinePredictor

java.lang.Object

moa.AbstractMOAObject

moa.options.AbstractOptionHandler

moa.recommender.predictor.BaselinePredictor

All Implemented Interfaces:

Serializable, MOAObject, OptionHandler, RatingPredictor

public class BaselinePredictor
extends AbstractOptionHandler
implements RatingPredictor

A naive algorithm which combines the global mean of all the existing ratings, the mean rating of the user and the mean rating of the item to make a prediction.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
ClassOption	dataOption
protected BaselinePredictor	rp

Fields inherited from class moa.options.AbstractOptionHandler

classOptionNamesToPreparedObjects, options

Constructor Summary

Constructors

Constructor and Description
BaselinePredictor()

Method Summary

Methods

Modifier and Type	Method and Description
RecommenderData	getData()
void	getDescription(StringBuilder sb, int indent) Returns a string representation of this object.
double	predictRating(Integer user, Integer item)
double	predictRating(int userID, int itemID)
List<Double>	predictRatings(int userID, List<Integer> itemIDS)
protected void	prepareForUseImpl(TaskMonitor monitor, ObjectRepository repository) This method describes the implementation of how to prepare this object for use.
void	train()

Methods inherited from class moa.options.AbstractOptionHandler

copy, discoverOptionsViaReflection, getCLICreationString, getOptions, getPreparedClassOption, getPreparedClassOption, getPurposeString, prepareClassOptions, prepareForUse, prepareForUse

Methods inherited from class moa.AbstractMOAObject

copy, measureByteSize, measureByteSize, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface moa.MOAObject

measureByteSize

Field Detail

rp

protected BaselinePredictor rp

dataOption

public ClassOption dataOption

Constructor Detail

BaselinePredictor

public BaselinePredictor()

Method Detail

prepareForUseImpl

protected void prepareForUseImpl(TaskMonitor monitor,
                     ObjectRepository repository)

Description copied from class: AbstractOptionHandler

This method describes the implementation of how to prepare this object for use. All classes that extends this class have to implement prepareForUseImpl and not prepareForUse since prepareForUse calls prepareForUseImpl.

Specified by:

prepareForUseImpl in class AbstractOptionHandler

Parameters:

monitor - the TaskMonitor to use

repository - the ObjectRepository to use

getDescription

public void getDescription(StringBuilder sb,
                  int indent)

Description copied from interface: MOAObject

Returns a string representation of this object. Used in AbstractMOAObject.toString to give a string representation of the object.

Specified by:

getDescription in interface MOAObject

Parameters:

sb - the stringbuilder to add the description

indent - the number of characters to indent

predictRating

public double predictRating(Integer user,
                   Integer item)

getData

public RecommenderData getData()

Specified by:

getData in interface RatingPredictor

predictRating

public double predictRating(int userID,
                   int itemID)

Specified by:

predictRating in interface RatingPredictor

predictRatings

public List<Double> predictRatings(int userID,
                          List<Integer> itemIDS)

Specified by:

predictRatings in interface RatingPredictor

train

public void train()

Specified by:

train in interface RatingPredictor