Strange behavior in external package

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) (--> 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)

 

FZI Forschungszentrum Informatik

Haid-und-Neu-Str. 10–14

76131 Karlsruhe, Germany

Tel.: +49 721 9654-509

[email protected]

 

 <https://www.fzi.de/team/martin-trat> www.fzi.de/team/martin-trat 

 <https://www.fzi.de/> www.fzi.de |  <http://www.twitter.com/FZI_official>
www.twitter.com/FZI_official |
<http://www.linkedin.com/company/fzi-official>
www.linkedin.com/company/fzi-official |
<https://www.youtube.com/FZIchannel> www.youtube.com/FZIchannel

…………………………………………………
FZI Forschungszentrum Informatik
Stiftung des bürgerlichen Rechts
Stiftung Az: 14-0563.1 Regierungspräsidium Karlsruhe
Vorstand: Prof. Dr. Andreas Oberweis, Jan Wiesenberger, Prof. Dr.-Ing. J.
Marius Zöllner
Vorsitzender des Kuratoriums: Ministerialdirigent Günther Leßnerkraus
…………………………………………………

_______________________________________________
Wekalist mailing list -- [email protected]
Send posts to [email protected]
To unsubscribe send an email to [email protected]
To subscribe, unsubscribe, etc., visit https://list.waikato.ac.nz/postorius/lists/wekalist.list.waikato.ac.nz
List etiquette: http://www.cs.waikato.ac.nz/~ml/weka/mailinglist_etiquette.html