Converting Weka Explorer options

[Peter Reutemann]

Hello Peter, could you please tell me what the format would be to enter through options=[....], the options of the JRip algorithm that is seen in the image, I think it would be options=["100", "True","False","False","3","2.0","2","2","135","True"]

The above are the properties as used by the GenericObjectEditor (GOE), which you can't use with pww3. But you can use the GOE to configure a classifier and the transfer the options quite easily:

- configure the classifier

- select OK to accept the options

- right-click on the panel displaying classifier name and options

- select "Copy configuration to clipboard"

Using the "from_commandline" method from the weka.core.classes module, you can convert that command-line into a classifier object:

import weka.core.jvm as jvm
from weka.core.classes import from_commandline

jvm.start()

cmdline = 'weka.classifiers.rules.JRip -F 3 -N 2.0 -O 2 -S 135'
classifier = from_commandline(cmdline, classname="weka.classifiers.Classifier")
print(classifier)
print(classifier.to_commandline())

jvm.stop()
 

Cheers, Peter

--

Peter Reutemann
Dept. of Computer Science

University of Waikato, Hamilton, NZ

Mobile +64 22 190 2375

https://www.cs.waikato.ac.nz/~fracpete/
http://www.data-mining.co.nz/

[Dario Martinez]

Hello Peter, I have two doubts, the first is that you cannot use the options[...] command in the Jrip classifier, like the other classifiers?, and the second, in the example you gave me, I could construct a string to load it to "cmdline =", this in order to change the seed dynamically?

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[Peter Reutemann]

> Hello Peter, I have two doubts, the first is that you cannot use the options[...] command in the Jrip classifier, like the other classifiers?,

No, you can use "options=[...]", just like with any classifier. I was
merely pointing a simple way of converting a setup from the Weka
Explorer into a pww3 classifier object. Since you posted the GOE
screenshot.

cls = Classifier(classname="weka.classifiers.rules.JRip",
options=["-F", "3", "-N", "2.0", "-O", "2", "-S", "135"])

Or, if you already have a JRip classifier object:
cls.options = ["-F", "3", "-N", "2.0", "-O", "2", "-S", "135"]

> and the second, in the example you gave me, I could construct a string to load it to "cmdline =", this in order to change the seed dynamically?

seed = 135
cmdline = 'weka.classifiers.rules.JRip -F 3 -N 2.0 -O 2 -S %d' % seed