org.grouplens.lenskit.data.history

Class RatingVectorUserHistorySummarizer

java.lang.Object

org.grouplens.lenskit.data.history.RatingVectorUserHistorySummarizer

All Implemented Interfaces:

Serializable, UserHistorySummarizer

@Shareable
 @ThreadSafe
public final class RatingVectorUserHistorySummarizer
extends Object
implements UserHistorySummarizer, Serializable

Summarize a history by extracting a rating vector.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
RatingVectorUserHistorySummarizer()

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o) All rating vector summarizers are equal.
Class<? extends Event>	eventTypeWanted() Get the supertype of all events required by this summarizer.
int	hashCode()
static SparseVector	makeRatingVector(UserHistory<? extends Event> history)
SparseVector	summarize(UserHistory<? extends Event> history) Compute a vector summary of a user's history.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

RatingVectorUserHistorySummarizer

public RatingVectorUserHistorySummarizer()

Method Detail

eventTypeWanted

public Class<? extends Event> eventTypeWanted()

Description copied from interface: UserHistorySummarizer

Get the supertype of all events required by this summarizer.

Specified by:

eventTypeWanted in interface UserHistorySummarizer

Returns:

A type such that any type used by this summarizer is a subtype of it.

summarize

@Nonnull
public SparseVector summarize(@Nonnull
                                       UserHistory<? extends Event> history)

Description copied from interface: UserHistorySummarizer

Compute a vector summary of a user's history.

Specified by:

summarize in interface UserHistorySummarizer

Parameters:

history - The history to summarize.

Returns:

A vector summarizing the user's history.

makeRatingVector

public static SparseVector makeRatingVector(@Nonnull
                                            UserHistory<? extends Event> history)

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

All rating vector summarizers are equal.

Overrides:

equals in class Object