Splitting Training testing data

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Splitting Training testing data

Peter holunaro

Unless you explicitly tell WEKA (i.e., the Explorer, CLI, Experimenter, or KnowledgeFlow) to preserve the order in the data by selecting the appropriate option (if available), it will randomly shuffle the data before splitting it.


Eibe, what do you mean by saying: " by selecting the appropriate option (if available)"? Where such option can be found?


Thanks.
 
Peter

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Re: Splitting Training testing data

Eibe Frank-3
In the Explorer, under "More options..." select "Preserve order for % split" when you do a percentage split evaluation.

In the CLI, use the "-preserve-order" flag along with the "-split-percentage" option.

In the Experimenter, select, as "Experiment Type", "Train/Test Percentage Split (order preserved)".

In the KnowledgeFlow, set "Preserve instance order" to "true" when you configure the "TrainTestSplitMaker".

Cheers,
Eibe

On Fri, Jan 6, 2017 at 5:59 AM, Peter holunaro <[hidden email]> wrote:

Unless you explicitly tell WEKA (i.e., the Explorer, CLI, Experimenter, or KnowledgeFlow) to preserve the order in the data by selecting the appropriate option (if available), it will randomly shuffle the data before splitting it.


Eibe, what do you mean by saying: " by selecting the appropriate option (if available)"? Where such option can be found?


Thanks.
 
Peter

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