Hi,
what is the difference between the dropdown box and the text input field in the "Flow Variables" tab? Please forgive me if I miss the obvious, but I was not able to figure this out...
I tried to implement parameter variation on the random forest learner in a loop. To do so e.g. for the nrModels property, I select my flow variable from the dropdown box and everything seems to work fine.
If I try to vary the splitCriterion property by again selecting my corresponding flow variable in the dropdown box, I get «Errors loading flow variables into node : Unable to parse split criterion "Information Gain"»
A screenshot in a post dating from 2014 (https://tech.knime.org/forum/knime-general/parameter-optimization-and-dialog-options-in-learning-algorithms) suggests to not use the dropdown box, but to reference the variable name in the text input field right beside the dropdown box. If I do so, everything seems to work fine. Although I have no proof the parameter value has effectly been in use in the learner.
- What ist the difference between the dropdown box and the text input field?
- Is there a way I can validate that my variables were in use in the learner? I'm already aware of loop stepping.