Nested loops: flow variable and cross validation

Hallo to everyone!

I am trying to assemble a workflow with two nested loops: the outer loop passes a flow variable to the libSVM node (the c parameter) and the inner loop should iterate a cross validation for one value of c at the time. If I use only the outher loop everything is doing fine. When I connect the CV loop it doen't work, giving me the following error message:

Unable to merge flow object stacks: Conflicting FlowObjects: <Loop Context (Head 3:75, Tail unassigned)> - iteration 0 vs. <Loop Context (Head 3:2, Tail unassigned)> - iteration 0 (loops not properly nested?)

In attachment you will find a picture of the workflow

Any help will be really appreciated

Thank you in advance






You have to connect the "Table Row To Variable Loop Start" to the "X-Partitioner". Otherwise you don't have nested loops and it is unclear which is the inner and which is the outer loop.

Thank you so much Thor! now everything works!

I'll never thank you enough!