Re: Time Based Recommender System

2013-05-01 Thread Chirag Lakhani
Thanks, I will take a look at the Implicit Feedback literature to see how it can apply to my situation. Are you aware of any time aware implicit feedback models? On Tue, Apr 30, 2013 at 11:46 AM, Ted Dunning ted.dunn...@gmail.com wrote: Keep in mind that time dynamics generally have benefit

Re: Time Based Recommender System

2013-05-01 Thread Ted Dunning
On Wed, May 1, 2013 at 9:28 AM, Chirag Lakhani clakh...@zaloni.com wrote: Thanks, I will take a look at the Implicit Feedback literature to see how it can apply to my situation. Are you aware of any time aware implicit feedback models? No. I don't know of any work on that. I am also not

Re: Time Based Recommender System

2013-05-01 Thread Robin Morris
On 5/1/13 11:03 AM, Ted Dunning ted.dunn...@gmail.com wrote: The question here is how to get the recommendation engine to explore more when appropriate and less when no. Exploring now (i.e. bringing in more diversity in recommendations) pays off tomorrow because the system gets new kinds of

Time Based Recommender System

2013-04-30 Thread Chirag Lakhani
I was wondering if the collaborative filtering library in Mahout has any algorithms that incorporate concept drift i.e. time dynamics. From my own research I have come across the BellKor algorithm called TimeSVD++ and there is a recent paper using hidden markov models with collaborative

Re: Time Based Recommender System

2013-04-30 Thread Sean Owen
No, time is in the data model but nothing uses it that I know of. On Tue, Apr 30, 2013 at 3:18 PM, Chirag Lakhani clakh...@zaloni.com wrote: I was wondering if the collaborative filtering library in Mahout has any algorithms that incorporate concept drift i.e. time dynamics. From my own

Re: Time Based Recommender System

2013-04-30 Thread Chirag Lakhani
Do you know of any other large scale machine learning platforms that do incorporate it? On Tue, Apr 30, 2013 at 10:21 AM, Sean Owen sro...@gmail.com wrote: No, time is in the data model but nothing uses it that I know of. On Tue, Apr 30, 2013 at 3:18 PM, Chirag Lakhani clakh...@zaloni.com

Re: Time Based Recommender System

2013-04-30 Thread Sean Owen
GraphLab -- http://docs.graphlab.org/collaborative_filtering.html#SVD_PLUS_PLUS On Tue, Apr 30, 2013 at 3:30 PM, Chirag Lakhani clakh...@zaloni.com wrote: Do you know of any other large scale machine learning platforms that do incorporate it? On Tue, Apr 30, 2013 at 10:21 AM, Sean Owen

Re: Time Based Recommender System

2013-04-30 Thread Ted Dunning
Keep in mind that time dynamics generally have benefit for predicting ratings. The point is that the average rating for a person goes up and down over time even if their general taste doesn't change. Likewise for an item. If you use implicit feedback and recommend based on recent behavior most