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List:       wekalist
Subject:    Re: [Wekalist] How to update an existing model in Weka?
From:       Christophe Salperwyck <christophe.salperwyck () gmail ! com>
Date:       2012-06-27 6:54:07
Message-ID: CAGUT8BKL1sH8pbVQPPzDzeypXRFeN5vON8y-5KY4OnQF7gOwPQ () mail ! gmail ! com
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I don't think you can disable pruning for an existing model as pruning
is a part of the construction of the model. Pruning is only (mainly?)
used on tree model building.
In J48 you have to set the -U option to disable all pruning before
learning the classifier.

Best,
Christophe

You can read this post:
http://old.nabble.com/forum/PrintPost.jtp?post=25984297

2012/6/27 Mr. Debojit Boro <deb0001@tezu.ernet.in>:
> Hi Christrophe,
>
> Thanks for the reply. Could you please tell me how to disable pruning in
> Weka for an existing model? I am new to Weka.
>
> Regards
>
> Debojit
>
>
>> Hi all,
>>
>> If you want this kind of behavior perhaps you should simply consider
>> the option that will disable pruning. Be aware that the badly
>> classified instances can simply be noise.
>>
>> Best,
>> Christophe
>>
>> 2012/6/26 Mr. Debojit Boro <deb0001@tezu.ernet.in>:
>>> Hi All,
>>>
>>> Can anyone help me to how to update an existing model in Weka. Actually,
>>> I
>>> am training C4.5(J48) algorithm with a dataset. But after it gets
>>> trained,
>>> there is still some instances in the dataset that are not correctly
>>> classified.
>>>
>>> I want to retrain the already trained C4.5(J48) model with those
>>> incorrectly classified instances but don't want C4.5 to forget the
>>> previously learned informations. I just want to update the C4.5 model.
>>> Is
>>> it possible to do so?
>>>
>>> Regards
>>>
>>> Debojit Boro
>>>
>>>
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