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From Ted Dunning <ted.dunn...@gmail.com>
Subject Re: Mahout performance issues
Date Fri, 02 Dec 2011 18:18:16 GMT
On Fri, Dec 2, 2011 at 10:14 AM, Sean Owen <srowen@gmail.com> wrote:

> I agree, though that's something slightly different to the question at hand
> here. If just about every user viewed X, you could probably forget X, yes.
>
> But if some user happened to only view one item, Y, can you drop that? It
> affects correctness. I argue that it doesn't really affect the bottleneck
> in question here, which is not quite the point you are getting at.
>

No.  Dropping that does not affect correctness if that item is highly
popular.

If that item is not vastly popular, it does provide some information and
would not be affected by my suggestions.


>
> On Fri, Dec 2, 2011 at 6:07 PM, Ted Dunning <ted.dunning@gmail.com> wrote:
>
> > Since touching them adds nothing but cost, then not touching them is
> > better.  Kill the item!
> >
> > In practical terms, we had this problem at Veoh.  Everybody got the same
> > intro video.  It provided no information.  Likewise at Musicmatch,
> > everybody got the same startup noise during the splash screen.  It added
> no
> > information.  Both of these cases would kill performance in lots of
> > recommendation engines because a vast number of users would get sucked
> into
> > computations where it made no difference at all.
> >
> > Better to kill these items.
>

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