Pseudo Random Numbers Generator

KNIME Extensions
1

Dear community,

I have inquired on the matter which random numbers generator(s) KNIME is using in general,

and in particular in the bagging process of the RandomForestLearner Node. Is it by any chance

MersenneTwister?

I intend to reproduce a finding in sci-kit learn in KNIME and need exact information about the implementation/

default settings of the node.

 

Furthermore, will the GINI impurity splitting criterion be implemented any time soon?

Last but not least, is there a more thorough documentation of the RandomForestLearner node?

 

Kind regards,

moxplayer

2

Hello moxplayer,

I believe most nodes use java.util.Random as random number generator, at least the random forest does.

Exactly reproducing results of a different implementation could proof to be very difficult as there are many factors at play.

Regarding your second question: The gini impurity is already implemented in the KNIME random forest (and tree ensemble) nodes for classification. You have to select Gini Index as splitting criterion. I agree that the naming is somewhat wrong here and I will file a bug to change this.

Kind regards,

nemad

3