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
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