Export spark feature transformation pipeline to a file
问题 PMML, Mleap, PFA currently only support row based transformations. None of them support frame based transformations like aggregates or groupby or join. What is the recommended way to export a spark pipeline consisting of these operations. 回答1: I see 2 options wrt Mleap: 1) implement dataframe based transformers and the SQLTransformer -Mleap equivalent. This solution seems to be conceptually the best (since you can always encapsule such transformations in a pipeline element) but also alot of