Mahout's SVN repository should always be the latest. The Maven
repository represents the code as of the last official release. The
code block does not exist now in SVN (I think I took it out since it
was *really* that useful to check these things and was impacting
performance.)

On Mon, Jun 15, 2009 at 2:40 PM, Gökhan Çapan<[email protected]> wrote:
> Hi,
> BooleanTanimotoCoefficientSimilarity.userSimilarity(User user1, User user2)
> that function is different in checked out code from svn repository and in
> maven repository.
> Which of those is latest code?
>
> public double userSimilarity(User user1, User user2) {
>   /*************************** This block does not exist in code that is
> checked out from mahout's svn repository
>    if (user1 == null || user2 == null) {
>      throw new IllegalArgumentException("user1 or user2 is null");
>    }
>    if (!(user1 instanceof BooleanPrefUser && user2 instanceof
> BooleanPrefUser)) {
>      throw new IllegalArgumentException();
>    }*************************/
>    BooleanPrefUser<?> bpUser1 = (BooleanPrefUser<?>) user1;
>    BooleanPrefUser<?> bpUser2 = (BooleanPrefUser<?>) user2;
>
>    FastSet<Object> prefs1 = bpUser1.getItemIDs();
>    FastSet<Object> prefs2 = bpUser2.getItemIDs();
>    int intersectionSize =
>        prefs1.size() < prefs2.size() ? prefs2.intersectionSize(prefs1) :
> prefs1.intersectionSize(prefs2);
>
>    int unionSize = prefs1.size() + prefs2.size() - intersectionSize;
>
>    return (double) intersectionSize / (double) unionSize;
>  }
>

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