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"Decision Tree on a huge sparse dataset"

aryan_hosseinzaaryan_hosseinza Member Posts: 74 Contributor II
edited June 2019 in Help
Hi,

I have very sparse dataset with huge number of attributes (~12 K features and 700K records) I can not fit it in memory (attribute values are binomial i.e. True/False) ,

As it is sparse I keep the dataset in (ID , Feature) format, so for example I would have the following records :
(ID , Feature)
(110 , d_0022)
(110 , d_2393)
(110 , i_2293)
(822 , d_933)
(822 , p_2003)
....

So we would have three attributes with true value (d_0022 ; 2_2393 ; i_2293) for the record with ID : 110 and the rest are false (attributes are all distinct values of the attribute "feature")

Is it possible to train decision tree while not making the whole dataset first ?

Thanks
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    MariusHelfMariusHelf RapidMiner Certified Expert, Member Posts: 1,869 Unicorn
    No, it's not possible to train directly on the de-pivoted data. You'll have to use the Pivot operator to create a row-based format. If your data is sparse, however, you can try to set the datamanagement to double_sparse_array to save memory.

    Best regards,
    Marius
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