Add a key->vector pair.
Add a key->vector pair. The vector should be normalized.
Build an immutable NearestNeighbor instance.
Dimension of item vectors.
Dimension of item vectors.
Add a key->vector pair to common storage.
Add a key->vector pair to common storage.
Numeric id to item key mapping.
Numeric id to item key mapping.
Item key to numeric id mapping.
Item key to numeric id mapping.
Raw item vectors.
Raw item vectors.
Builder for immutable NearestNeighbor instances.