brickhouse.udf.sketch
Class SetSimilarityUDF

java.lang.Object
  org.apache.hadoop.hive.ql.exec.UDF
      brickhouse.udf.sketch.SetSimilarityUDF

public class SetSimilarityUDF
extends org.apache.hadoop.hive.ql.exec.UDF

Compute the Jaccard similarity of two sketch sets. Jaccard Similarity is defined as the size of the intersection of two sets divided by the size of the union of the sets. Since sketches are only approximate measures, this calculation only makes sense when the sets are roughly the same size.

Constructor Summary

SetSimilarityUDF()

Method Summary

Double

evaluate(List<String> a, List<String> b)

Methods inherited from class org.apache.hadoop.hive.ql.exec.UDF

getRequiredFiles, getRequiredJars, getResolver, setResolver

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SetSimilarityUDF

public SetSimilarityUDF()

Method Detail

evaluate

public Double evaluate(List<String> a,
                       List<String> b)