supplied test set in weka python

[Aldo Rodríguez]

hello, someone will have an example of implementing supplied test set in weka python, I have a training set and a test set but I would like to use the weka sdk with python. first of all, Thanks

[Peter Reutemann]

> hello, someone will have an example of implementing supplied test set in weka python, I have a training set and a test set but I would like to use the weka sdk with python. first of all, Thanks

Have you had a look at the example repository?
https://github.com/fracpete/python-weka-wrapper-examples

For instance, here is an example of splitting a dataset into
train/test, training a classifier and then evaluating it:
https://github.com/fracpete/python-weka-wrapper-examples/blob/master/src/wekaexamples/classifiers/train_test_split.py

The exact examples also exist for the Python 3 version of the library
(you didn't specify what version of the library you're using):
https://github.com/fracpete/python-weka-wrapper3-examples

Cheers, Peter
--
Peter Reutemann
Dept. of Computer Science
University of Waikato, NZ
+64 (7) 858-5174
http://www.cms.waikato.ac.nz/~fracpete/
http://www.data-mining.co.nz/

[Aldo Rodríguez]

I use python3, I have two predefined files, a test set and a training set, I understand that in the example:

https://github.com/fracpete/python-weka-wrapper-examples/blob/master/src/wekaexamples/classifiers/train_test_split.py

It does a split test and generates an automatic test set but I just want to evaluate it with the test set I already have.

[Peter Reutemann]

It should be obvious, that in your case you just load two datasets from disks. Building and testing is the same.

Cheers, Peter

--
Peter Reutemann
Dept. of Computer Science
University of Waikato, NZ
+64 (7) 858-5174
http://www.cms.waikato.ac.nz/~fracpete/
http://www.data-mining.co.nz/

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[Aldo Rodríguez]

yes although I get an error, I do not know what is due, I'll show it in the image, thank you very much for the attention

[Aldo Rodríguez]

El martes, 6 de noviembre de 2018, 23:53:14 (UTC-6), Aldo Rodríguez escribió:

[Peter Reutemann]

You didn't set the class attribute for the test set. Hence the error message, class not set.

Cheers, Peter

--
Peter Reutemann
Dept. of Computer Science
University of Waikato, NZ
+64 (7) 858-5174
http://www.cms.waikato.ac.nz/~fracpete/
http://www.data-mining.co.nz/

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[Aldo Rodríguez]

yes but I get the following error

El martes, 6 de noviembre de 2018, 23:53:14 (UTC-6), Aldo Rodríguez escribió:

[Peter Reutemann]

This is Python, not Java. Check the API documentation.

The training set is getting the class attribute set as well. Use the same approach.

Cheers, Peter

--
Peter Reutemann
Dept. of Computer Science
University of Waikato, NZ
+64 (7) 858-5174
http://www.cms.waikato.ac.nz/~fracpete/
http://www.data-mining.co.nz/

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[Aldo Rodríguez]

Excuse me, I will have some example, I would appreciate very much

El martes, 6 de noviembre de 2018, 23:53:14 (UTC-6), Aldo Rodríguez escribió:

[Peter Reutemann]

Check the example code where the class attribute is set for the training set.

Cheers, Peter

--
Peter Reutemann
Dept. of Computer Science
University of Waikato, NZ
+64 (7) 858-5174
http://www.cms.waikato.ac.nz/~fracpete/
http://www.data-mining.co.nz/

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