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ASF GitHub Bot commented on MAHOUT-1464: ---------------------------------------- Github user pferrel commented on a diff in the pull request: https://github.com/apache/mahout/pull/18#discussion_r13771652 --- Diff: math/src/main/java/org/apache/mahout/math/function/Functions.java --- @@ -1393,6 +1393,17 @@ public double apply(double a) { }; } + /** Constructs a function that returns <tt>a != b ? 1 : 0</tt>. <tt>a</tt> is a variable, <tt>b</tt> is fixed. */ + public static DoubleFunction notEqual(final double b) { + return new DoubleFunction() { + + @Override + public double apply(double a) { + return a != b ? 1 : 0; --- End diff -- Taken from "equal" in the same file. Changed one character. But I'll note the point. > Cooccurrence Analysis on Spark > ------------------------------ > > Key: MAHOUT-1464 > URL: https://issues.apache.org/jira/browse/MAHOUT-1464 > Project: Mahout > Issue Type: Improvement > Components: Collaborative Filtering > Environment: hadoop, spark > Reporter: Pat Ferrel > Assignee: Pat Ferrel > Fix For: 1.0 > > Attachments: MAHOUT-1464.patch, MAHOUT-1464.patch, MAHOUT-1464.patch, > MAHOUT-1464.patch, MAHOUT-1464.patch, MAHOUT-1464.patch, run-spark-xrsj.sh > > > Create a version of Cooccurrence Analysis (RowSimilarityJob with LLR) that > runs on Spark. This should be compatible with Mahout Spark DRM DSL so a DRM > can be used as input. > Ideally this would extend to cover MAHOUT-1422. This cross-cooccurrence has > several applications including cross-action recommendations. -- This message was sent by Atlassian JIRA (v6.2#6252)