org.grouplens.lenskit.data.history

Interface UserHistorySummarizer

All Known Implementing Classes:

EventCountUserHistorySummarizer, LikeCountUserHistorySummarizer, RatingVectorUserHistorySummarizer

@DefaultImplementation(value=RatingVectorUserHistorySummarizer.class)
public interface UserHistorySummarizer

Summarize user histories as real-valued vectors.

Method Summary

Modifier and Type	Method and Description
Class<? extends Event>	eventTypeWanted() Get the supertype of all events required by this summarizer.
SparseVector	summarize(UserHistory<? extends Event> history) Compute a vector summary of a user's history.

Method Detail

eventTypeWanted

Class<? extends Event> eventTypeWanted()

Get the supertype of all events required by this summarizer.

Returns:

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

summarize

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

Compute a vector summary of a user's history.

Parameters:

history - The history to summarize.

Returns:

A vector summarizing the user's history.