org.grouplens.lenskit.data.pref

Interface IndexedPreference

All Superinterfaces:

Preference

public interface IndexedPreference
extends Preference

A Preference that also provides 0-based indices for the user, item, and itself.

Compatibility

Public

Method Summary

Modifier and Type	Method and Description
int	getIndex() Get the preference index.
int	getItemIndex() Get the item index.
int	getUserIndex() Get the user index.

Methods inherited from interface org.grouplens.lenskit.data.pref.Preference

getItemId, getUserId, getValue

Method Detail

getIndex

int getIndex()

Get the preference index. Each indexed preference (within a given context, such as a PackedPreferenceSnapshot) has a unique, contiguous, zero-based index. This is to make it easy to store additional information related to preferences for efficient learning scenarios.

Returns:

The preference's index.

getItemIndex

int getItemIndex()

Get the item index. This is a zero-based index for the item, used for making item data easy to store in arrays.

Returns:

The item index.

getUserIndex

int getUserIndex()

Get the user index. This is a zero-based index for the user, used for making user data easy to store in arrays.

Returns:

The user index.