I believe the ALS algo expects the ratings to be aggregated (A). I don't see why you have to use decimals for rating.
Regards Sab On Thu, Feb 25, 2016 at 4:50 PM, Hiroyuki Yamada <mogwa...@gmail.com> wrote: > Hello. > > I just started working on CF in MLlib. > I am using trainImplicit because I only have implicit ratings like page > views. > > I am wondering which is a more appropriate form of ratings. > Let's assume that view count is regarded as a rating and > user 1 sees page 1 3 times and sees page 2 twice and so on. > > In this case, I think ratings can be formatted like the following 2 cases. > (of course it is a RDD actually) > > A: > user_id,page_id,rating(page view) > 1,1,0.3 > 1,2,0.2 > ... > > B: > user_id,page_id,rating(page view) > 1,1,0.1 > 1,1,0.1 > 1,1,0.1 > 1,2,0.1 > 1,2,0.1 > ... > > It is allowed to have like B ? > If it is, which is better ? ( is there any difference between them ?) > > Best, > Hiro > > > >
