Hi, I've run into an exception using MLlib OneVsRest with logistic regression (v1.6.0, but also in previous versions).
The issue is intermittent. When running multiclass classification with K-fold cross validation, there are scenarios where the split does not contain instances for every target label. In such cases, an ArrayIndexOutOfBoundsException is generated. I've tried to reproduce the problem in a simple SBT project here: https://github.com/junglebarry/SparkOneVsRestTest I don't imagine this is typical - it first surfaced when running over a dataset with some very rare classes. I'm happy to look into patching the code, but I first wanted to confirm that the problem was real, and that I wasn't somehow misunderstanding how I should be using OneVsRest. Any guidance would be appreciated - I'm new to the list. Many thanks, David
