fselector seems to stall when parallelized with multicore?

[aydindemircioglu]

running this code (from bernd, see link to issue below)

library(parallel)                                                                                                                                                 
                                                                                                                                                                                                                                                                                                                                       
 fun = function(foo) {                                                                                                                                             
   chi.squared(Species ~ ., data = iris)                                                                                                                           
 }                                                                                                                                                                 
                                                                                                                                                                    
 mclapply(1:2, fun, mc.cores = 2)     

stalls. the same is true if instead of parallel, the parallelMap package is
used with 'multicore' (but parallelizing via 'socket' does not stall)--
is it possible that fselector cannot be used in 'multicore' fashion,
maybe because of the underlying java/weka packages?

the previous discussion is here: mlr-org/mlr#1802

[larskotthoff]

This is a problem with RWeka/rJava -- it can't be parallelized through multicore (sorry for not replying earlier, I'm travelling).

[aydindemircioglu]

ah, ok, thanks!

[mb706]

It seems like the only thing that makes RWeka necessary is the Discretize() function, so maybe it would be possible to use the discretization package or similar?