message: ml: disable not implemented k-fold validation in RTrees
diff: @@ -151,6 +151,11 @@ namespace ml
  CV_Error( CV_StsOutOfRange,
  "params.CVFolds should be =0 (the tree is not pruned) "
  "or n>0 (tree is pruned using n-fold cross-validation)" );
  + if(val > 1)
  + CV_Error( CV_StsNotImplemented,
  + "tree pruning using cross-validation is not implemented."
  + "Set CVFolds to 1");
  +
  if( val == 1 )
  val = 0;
  CVFolds = val;
  