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.
VectorTransformation	makeTransformation(long itemId, SparseVector vector) Deprecated. Use makeTransformation(long, Long2DoubleMap).
MutableSparseVector	normalize(long itemId, SparseVector vector, MutableSparseVector target) Deprecated. Old vectors are going away.

Method Detail

normalize

@Deprecated
MutableSparseVector normalize(long itemId,
                                           @Nonnull
                                           SparseVector vector,
                                           @Nullable
                                           MutableSparseVector target)

Deprecated. Old vectors are going away.

Normalize a vector with respect to an item vector.

Parameters:

itemId - The item id to normalize a vector for.

vector - The item’s vector for reference.

target - The vector to normalize. If null, the item vector is normalized.

Returns:

The target vector, if specified. Otherwise, a fresh mutable vector containing a normalized copy of the item vector is returned.

makeTransformation

@Deprecated
VectorTransformation makeTransformation(long itemId,
                                                     SparseVector vector)

Deprecated. Use makeTransformation(long, Long2DoubleMap).

Make a vector transformation for an 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 transformaition normalizing for this item.

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.