[R] Get Data Table from iml FeatureEffect Object

Bert Gunter
Tue, 17 Mar 2020 19:22:06 -0000

?str

Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Tue, Mar 17, 2020 at 12:19 PM Sparks, John <jspark4 at uic.edu> wrote:

> Hi R-Helpers,
>
> I have recently started working with the iml package (Interpretable
> Machine Learning)  and its associated material, which I generally find very
> helpful.
>
> I want to recover some values out of the FeatureEffect Object created by
> this library, but the form of the object is completely foreign to me.
>
> As a reproducible example:
>
>
> set.seed(42)?
> library("iml")?
> library("randomForest")?
> data("Boston", package  = "MASS")?
> rf = randomForest(medv ~ ., data = Boston, ntree = 50)?
> ?
> X = Boston[which(names(Boston) != "medv")]?
> predictor = Predictor$new(rf, data = X, y = Boston$medv)?
> imp = FeatureImp$new(predictor, loss = "mae")?
> eff = FeatureEffect$new(predictor, feature = "rm") ?
> eff
>
>
> Interpretation method:  FeatureEffect
> features: rm[numerical]
> grid size: 20
>
> Analysed predictor:
> Prediction task: unknown
>
>
> Analysed data:
> Sampling from data.frame with 506 rows and 13 columns.
>
> Head of results:
>        .ale .type    rm
> 1 -2.150574   ale 3.561
> 2 -2.610528   ale 5.304
> 3 -2.338677   ale 5.593
> 4 -2.265673   ale 5.709
> 5 -2.142912   ale 5.837
> 6 -2.085899   ale 5.885
>
> How can I refer to and get ahold of the table of 6 records above?
>
> I tried str(eff) and class(eff), but I am not familiar with the structure
> of the object(s).
>
> Would someone please tell me how to get inside the eff object, or point me
> to a reference as to what the class or structure of the object is?
>
> Thanks.
> --John Sparks
>
>         [[alternative HTML version deleted]]
>
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