See: Description
Class  Description 

Cosine 
A UDF used to find a vector v in a bag such that for query point q, metric m and threshold t
m(v,q) < t.

L1 
A UDF used to find a vector v in a bag such that for query point q, metric m and threshold t
m(v,q) < t.

L2 
A UDF used to find a vector v in a bag such that for query point q, metric m and threshold t
m(v,q) < t.

MetricUDF 
A base UDF used to find a vector v in a bag such that for query point q, metric m and threshold t
m(v,q) < t.
