Yes, we support “popular”, “trending”, and “hot” as methods for ranking items. The UR queries are backfilled with these items if there are not enough results. So if the users has little history and so only gets 5 out of 10 results based on this history, we will automatically return the other 5 from the “popular” results. This is the default, if there is no specific config for this.
If you query with no user or item, we will return only from “popular” or whatever brand of ranking you have setup. To change which type of ranking you want you can specify the period to use in calculating the ranking and which method from “popular”, “trending”, and “hot”. These roughly correspond to # of conversion, speed of conversion, and acceleration in conversions, if that helps. Docs here: http://actionml.com/docs/ur_config Search for “rankings" From: Sami Serbey <sami.ser...@designer-24.com> Reply: user@predictionio.apache.org <user@predictionio.apache.org> Date: June 20, 2018 at 10:25:53 AM To: user@predictionio.apache.org <user@predictionio.apache.org>, Pat Ferrel <p...@occamsmachete.com> Cc: user@predictionio.apache.org <user@predictionio.apache.org> Subject: Re: UR trending ranking as separate process Hi George, I didn't get your question but I think I am missing something. So you're using the Universal Recommender and you're getting a sorted output based on the trending items? Is that really a thing in this template? May I please know how can you configure the template to get such output? I really hope you can answer that. I am also working with the UR template. Regards, Sami Serbey Get Outlook for iOS From: George Yarish <gyar...@griddynamics.com> Sent: Wednesday, June 20, 2018 7:45:12 PM To: Pat Ferrel Cc: user@predictionio.apache.org Subject: Re: UR trending ranking as separate process Matthew, Pat Thanks for the answers and concerns. Yes, we want to calculate every 30 minutes trending for the last X hours, there X might be even few days. So realtime analogy is correct. On Wed, Jun 20, 2018 at 6:50 PM, Pat Ferrel <p...@occamsmachete.com> wrote: No the trending algorithm is meant to look at something like trends over 2 days. This is because it looks at 2 buckets of conversion frequencies and if you cut them smaller than a day you will have so much bias due to daily variations that the trends will be invalid. In other words the ups and downs over a day period need to be made irrelevant and taking day long buckets is the simplest way to do this. Likewise for “hot” which needs 3 buckets and so takes 3 days worth of data. Maybe what you need is to just count conversions for 30 minutes as a realtime thing. For every item, keep conversions for the last 30 minutes, sort them periodically by count. This is a Kappa style algorithm doing online learning, not really supported by PredictionIO. You will have to experiment with the length of time since a too small period will be very noisy, popping back and forth between items semi-randomly. From: George Yarish <gyar...@griddynamics.com> Reply: user@predictionio.apache.org <user@predictionio.apache.org> Date: June 20, 2018 at 8:34:10 AM To: user@predictionio.apache.org <user@predictionio.apache.org> Subject: UR trending ranking as separate process Hi! Not sure this is correct place to ask, since my question correspond to UR specifically, not to pio itself I guess. Anyway, we are using UR template for predictionio and we are about to use trending ranking for sorting UR output. If I understand it correctly ranking is created during training and stored in ES. Our training takes ~ 3 hours and we launch it daily by scheduler but for trending rankings we want to get actual information every 30 minutes. That means we want to separate training (scores calculation) and ranking calculation and launch them by different schedule. Is there any easy way to achieve it? Does UR supports something like this? Thanks, George -- George Yarish, Java Developer Grid Dynamics 197101, Rentgena Str., 5A, St.Petersburg, Russia Cell: +7 950 030-1941 Read Grid Dynamics' Tech Blog
