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From: Georgi Stanev <Georgi.Stanev@holidaycheck.com>
To: "user@mahout.apache.org" <user@mahout.apache.org>
Subject: Re: KnnItemBasedRecommender question
Thread-Topic: KnnItemBasedRecommender question
Thread-Index: Acyo93jtQ0J0Bk3ATr+bu3j6mkRGuQA9W/bPACwTWx4=
Date: Thu, 24 Nov 2011 11:46:58 +0000
Message-ID: <FE30A6330A343645BD6F91DBA975FEA5010352A3@ExMailbox.hc.lan>
References: 
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I'm not quite sure how to reply to you, Sean, because something didn't work=
ed with the subscription...
This is correct, what you wrote, but there are two terms in the sum, Rvj an=
d Rvk. You have to take into account also the second term. Namely...

    Float pj =3D dataModel.getPreferenceValue(userID, jitem);

which is Ruk.

Second iPrefs are the preferences for all users, not only those who rated i=
tem I and I's neighborhood. This shouldn't be correct to.
Third which A and b is calculated? A, A-dash or =C2?

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