Package org.grouplens.lenskit.data.event

LensKit's events and related types.

See: Description

Interface Summary

Interface	Description
Event	An event in a user's history.
Rating	A rating is an expression of preference for an item by a user.

Class Summary

Class	Description
Events
MutableRating	Rating implementation for mutation by fast iterators.
RatingBuilder	Build a Rating.
Ratings	Utilities for working with ratings.

Annotation Types Summary

Annotation Type	Description
EventType	A type of event, such as events to count in a history summarizer.
UseTimestamps	Parameter controlling whether a component is supposed to use timestamps.

Package org.grouplens.lenskit.data.event Description

LensKit's events and related types. Events are the core way of tracking user and item data in LensKit; users have events associated with items. Ratings are events, as are purchases, clicks, and other forms of user-item interaction data.

In some cases, it makes sense for an event to not be associated with any particular item (e.g. "user logged in"). In this case, we recommend that integrators use a designated item ID. So long as this ID does not show up in any events used by the recommender implementation, it should not affect recommendation. Likewise, a designated user ID can be used for item-only events.