org.lenskit.transform.normalize

Interface ItemVectorNormalizer

All Known Implementing Classes:

AbstractItemVectorNormalizer, BiasItemVectorNormalizer, DefaultItemVectorNormalizer

@DefaultImplementation(value=DefaultItemVectorNormalizer.class)
public interface ItemVectorNormalizer

Normalizes an item’s vector.

Method Summary

Modifier and Type	Method and Description
InvertibleFunction<Long2DoubleMap,Long2DoubleMap>	makeTransformation(long itemId, Long2DoubleMap vector) Make a vector transformation for a item.

Method Detail

makeTransformation

InvertibleFunction<Long2DoubleMap,Long2DoubleMap> makeTransformation(long itemId,
                                                                     Long2DoubleMap vector)

Make a vector transformation for a item. The resulting transformation will be applied to item vectors to normalize and denormalize them.

Parameters:

itemId - The item ID to normalize for.

vector - The item’s vector to use as the reference vector.

Returns:

The vector transformation normalizing for this item.