Hello. I develop recommendation system and use mahout on spark (1.0 snapshot). In the process I have found, that spark-itemsimilarity driver do not allow to process more than two action types. After reading the documentation, I found that, I should run it multiple times or use SimilarityAnalysis.cooccurrence API. But multiple running is not efficiently and write java/scala code is not always very convenient.
Furthermore, in sources of ItemSimilarityDriver.scala (at 217 line) I have found this comment "// todo: allow more than one cross-similarity matrix?" It is my first experience of working with opensource, also I hear writing here before creating issue is preferred. So my question: what about extending spark-itemsimilarity driver api with something like this: mahout spark-itemsimilarity --main-filter purchase --secondary-filter view,addToCart,like (other parameters are omitted) The result will be one indicator matrix and set of cross-indicator matrices(one for each secondary action) If it's helpful feature, I'll do it. P.S. Sorry for my poor English, it is not my native language. Regards, Oleg.
