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  1. Mahout
  2. MAHOUT-460

Add "maxPreferencesPerItemConsidered" option to o.a.m.cf.taste.hadoop.similarity.item.ItemSimilarityJob

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 0.4
    • None
    • None

    Description

      Because "coocurrence algorithms ... scale in the square of the number of occurrences most popular item" (Ted wrote that in a recent mail) we should offer a parameter to the ItemSimilarity job that makes it limit the number of considered preferences per item. RecommenderJob already has such an option.

      Attachments

        1. MAHOUT-460.patch
          44 kB
          Sebastian Schelter
        2. MAHOUT-460-2.patch
          41 kB
          Sebastian Schelter

        Issue Links

          is duplicated by

          Improvement - An improvement or enhancement to an existing feature or task. MAHOUT-467 Change Iterable<Cooccurrence> in org.apache.mahout.math.hadoop.similarity.RowSimilarityJob.SimilarityReducer to list or array to improve the performance

          • Major - Major loss of function.
          • Closed

          Test - A new unit, integration or system test. MAHOUT-468 Performance of RowSimilarityJob is not good

          • Major - Major loss of function.
          • Closed

          Activity

            People

              Unassigned Unassigned
              ssc Sebastian Schelter
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              Dates

                Created:
                Updated:
                Resolved: