Gil

@jonpsy great! If you start a PR I can have a look.

@karlnapf how does shogun handle missing data values? It is possible to have NaN values ("?" in arff files) ?

> For unit test, I would rather not base it on a file ... although there seems to be no other sensible way or? For unittest I could try and...

Yes, I need it for openml stuff!

So datetime somewhat works, but might have to add strptime definition for the windows build? (see https://stackoverflow.com/a/321877). The conversion to the c++ convention of datetime format needs to be tested...

@karlnapf I am not sure how to do the parsing of strings though, for that we would almost need a `SGMatrix`

@karlnapf @vigsterkr so the return type is now `CCombinedFeatures`, and I use `std::vector` internally. Current features: 1. handle numeric data with CDenseFeatures 2. handle dates (excluding timezone name parsing because...

also the error seems to be due to `AveragedPerceptron`? I am guessing there's some UB going on

@karlnapf I will skip the relational attributes for now, they don't seem to be used much (I haven't seen them yet other than in the ARFF reference manual) and I...

> * using CombinedFeatures is the best idea? I am torn....see discussion in irc. But maybe leave it as it is for now @karlnapf I have been thinking about this,...