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From Ted Dunning <>
Subject Re: Negative preferences
Date Sat, 16 Aug 2014 00:03:55 GMT
On Fri, Aug 15, 2014 at 2:24 PM, Pat Ferrel <> wrote:

> > On Aug 15, 2014, at 9:05 AM, Ted Dunning <> wrote:
> >
> > It is bad practice to use weightings to express different actions.  This
> > may be necessary in an ALS framework, but it is still a bad idea.
> >
> > A much better approach is to use multi-modal recommendation in which each
> > action is used independently in a cross-recommendation fashion to measure
> > predictive power.  Some thumbs down actions will likely predict some
> > purchases.  If you smash everything together, you won't see that
> subtlety.
> I think that is precisely what I was suggesting with #1. Using thumbs down
> as the secondary action—a cross-cooccurrence indicator. For the [B’A]h_b
> case. Where A is thumbs up and B is thumbs down.
> For that matter about any action that can be recorded for the same user
> set can now be treated as if it has some predictive value for the primary
> action because the cross-cooccurrence indicator will tell you whether that
> is a correct assumption or not.
> If this pans out it seems like a substantially new way of predicting user
> behavior by looking at many correlated actions but recommending only one
> (or few).

Sorry about that.

I didn't recognize what you were saying until I had read it again a few
times.  Unfortunately, I posted first and read after.

You are correct.  This is just what you said.  And it is very exciting new

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