Dear R Developers
I'm using the great randomForest package (4.6-7) for many projects and recently
stumbled upon a problem when I wrote unit tests for one of my projects:
On Windows, there are small numeric deviations when using the 32- / 64-bit
version of R, which doesn't seem to be a problem on Linux or Mac.
R64 on Windows produces the same results as R64/R32 on Linux or Mac:
> set.seed(131)
> importance(randomForest(Species ~ ., data=iris))
MeanDecreaseGini
Sepal.Length 9.452470
Sepal.Width 2.037092
Petal.Length 43.603071
Petal.Width 44.116904
R32 on Windows produces the following:
> set.seed(131)
> importance(randomForest(Species ~ ., data=iris))
MeanDecreaseGini
Sepal.Length 9.433986
Sepal.Width 2.249871
Petal.Length 43.594159
Petal.Width 43.941870
Is there a reason why this is different for the Windows builds? Are the
compilers on Windows doing different things for 32- / 64-bit builds than the
ones on Linux or Mac?
Thank you very much for your help.
Best regards,
George
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