Re: Strange behavior in external package

Thanks, Martin. I've checked your fix into the SVN repository.

Mark, can you make a new package release of external/DilcaDistance (version
1.0.2)?

Cheers,
Eibe

On Thu, 9 Jun 2022 at 19:05, Martin Trat <[email protected]> wrote:

> Dear fellow scientists and developers,
>
>
>
> in the latest version of the external package DilcaDistance I found
> strange behavior when attempting to work with it.
>
>
>
> When I try to execute DBSCAN clustering, I use the following command to
> use DilcaDistance as distance function *in unsupervised mode*
> (supervisedDiscretization set to False):
>
> DBSCAN -E 0.9 -M 6 -A “weka.core.DilcaDistance -R first-last”
>
> However I get the following error, informing me that, in fact, supervised
> discretization is set internally:
>
> Problem evaluating clusterer: Trying to use Supervised Discretization over
> a dataset without an assigned class attribute.
>
> Weirdly enough, when setting supervisedDiscretization to True, a -D flag
> in above command announces supervised calculation of DilcaDistance but I do
> not get an error message (although no class attribute is set in dataset).
>
> DBSCAN -E 0.9 -M 6 -A “weka.core.DilcaDistance -R first-last -D”
>
>
>
> However, when looking for said error in the source of DilcaDistance, this
> false behavior is clear to me:
>
> In
> https://svn.cms.waikato.ac.nz/svn/weka/branches/stable-3-8/packages/external/DilcaDistance/src/main/java/weka/core/
> -> file DilcaDistance.java
>
> *line 318* and following:
>
>             if (!supDiscr && m_Data.classIndex() < 0)
>
>                   throw new RuntimeException("Trying to use Supervised
> Discretization over a dataset without an assigned class attribute");
>
> It clearly should be if (supDiscr && m_Data.classIndex() < 0) (à leave
> out negation “!”), as supDiscr is True, if supervised discretization is
> activated.
>
>
>
> How can I contribute to solve this error in source?
>
>
>
> Best
>
> Martin
>
> …………………………………………………
>
> Martin Trat, M.Sc.
>
> Wissenschaftlicher Mitarbeiter | Research Associate
>
> Intelligent Systems and Production Engineering (ISPE)
>
>
>
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>
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>
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>
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>
>
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>
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