Package org.grouplens.lenskit.transform.normalize

Interfaces and classes for data normalization.

See: Description

Interface Summary

Interface	Description
ItemVectorNormalizer	Normalizes an item's vector.
UserVectorNormalizer	Normalize a user's vector.
VectorNormalizer	Normalize vectors by applying a reversible transformation with respect to a reference vector.
VectorTransformation	Reversible in-place vector transformations.

Class Summary

Class	Description
AbstractUserVectorNormalizer	Abstract user vector normalizer implementation.
AbstractVectorNormalizer	Abstract vector normalizer implementation.
BaselineSubtractingUserVectorNormalizer	User vector normalizer that subtracts a user's baseline scores.
DefaultItemVectorNormalizer	Default item vector normalizer that delegates to a generic VectorNormalizer.
DefaultUserVectorNormalizer	Default user vector normalizer that delegates to a generic VectorNormalizer.
IdentityVectorNormalizer	Identity normalization (makes no change).
MeanCenteringVectorNormalizer	Vector normlizer that subtracts the mean from every value.
MeanVarianceNormalizer	Normalizes against the variance of the vector with optional smoothing as described in Hofmann '04.
MeanVarianceNormalizer.Builder	A Builder for UserVarianceNormalizers that computes the variance from a RatingBuildContext.
UnitVectorNormalizer	Vector normalizer that scales a vector by the factor needed to scale the reference vector to a unit vector.

Package org.grouplens.lenskit.transform.normalize Description

Interfaces and classes for data normalization. Normalization is typically done prior to training a recommender.