I agree, if RM makes an attribute, it should be usable. No doubt that will get changed, but in the meantime use a regex to remove the brackets in the attribute name, like this..
that's true. Unfortunately, the parentheses go back to the first version of RapidMiner in 2001 and we cannot simply change the output names without breaking compatibility. So we have to write a parser for the processes etc. and this is something which is not easily done.
Until then, however, there are two new helper operators to overcome those naming issues:
- ChangeAttributeNamesReplace: replaces characters in matching attribute names, e.g. all non-word characters by an underscore
- ChangeAttributeNames2Generic: replaces the matching attribute names by generic names