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  1. Mahout
  2. MAHOUT-1602

Euclidean Distance Similarity Math

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    Description

      Within the file:

      /mrlegacy/src/main/java/org/apache/mahout/cf/taste/impl/similarity/EuclideanDistanceSimilarity.java

      Mentions that the implementation should be sqrt / (1 + distance).

      Once the equation is simplified, should be:
      1 / ((1 + distance) / sqrt)

      Coded:
      return 1.0 / ((1.0 + Math.sqrt(sumXYdiff2)) / Math.sqrt);

      But instead is (missing grouping brackets):
      1 / (1 + distance / sqrt )

      Coded:
      return 1.0 / (1.0 + Math.sqrt(sumXYdiff2) / Math.sqrt);

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            sslavic Stevo Slavić
            leonfs Leonardo Fernandez Sanchez
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              Updated:
              Resolved: