Return-Path: Delivered-To: apmail-lucene-mahout-user-archive@minotaur.apache.org Received: (qmail 61925 invoked from network); 10 Sep 2009 07:20:57 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 10 Sep 2009 07:20:57 -0000 Received: (qmail 95229 invoked by uid 500); 10 Sep 2009 07:20:56 -0000 Delivered-To: apmail-lucene-mahout-user-archive@lucene.apache.org Received: (qmail 95143 invoked by uid 500); 10 Sep 2009 07:20:56 -0000 Mailing-List: contact mahout-user-help@lucene.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: mahout-user@lucene.apache.org Delivered-To: mailing list mahout-user@lucene.apache.org Received: (qmail 95133 invoked by uid 99); 10 Sep 2009 07:20:56 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 10 Sep 2009 07:20:56 +0000 X-ASF-Spam-Status: No, hits=2.2 required=10.0 tests=HTML_MESSAGE,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of ted.dunning@gmail.com designates 209.85.211.183 as permitted sender) Received: from [209.85.211.183] (HELO mail-yw0-f183.google.com) (209.85.211.183) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 10 Sep 2009 07:20:47 +0000 Received: by ywh13 with SMTP id 13so5618142ywh.20 for ; Thu, 10 Sep 2009 00:20:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :from:date:message-id:subject:to:content-type; bh=8F3hfsaRIqRnNHt6v/bhQZ8CnPCyFD3BUOx2fwr1dw8=; b=yHACg/mgDT+5vx0qzmkz1uu5vcA72Hlu7emm94Haristkbm67dvIMHPkw80zARJAZh kXQkwZfW15F5ojt3zJsLOQOyDg2jhOOmifNKyQ6oNJmV4BAV20DwDQl7ADplfPb/G1vf O8P+70FxurRhea3QrNuZQWXho89bcCR7/Oab8= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; b=BgqbCPWIgMHDU7obsFeN7AF/lb5l7jyhOC7KshfjHGaY+WVSgvDJVZUtJ3A+mWxfep 5gHRfhkqKceXijxgDNtFTXDBzXAeyp+K3Y+wP6Nsi4ellDhihKAGJX/psgDbhIQal+VZ KVHPtdwrhm0VxPu0cWksGbJ6xqY396RDurar8= MIME-Version: 1.0 Received: by 10.150.132.11 with SMTP id f11mr886501ybd.280.1252567226065; Thu, 10 Sep 2009 00:20:26 -0700 (PDT) In-Reply-To: References: <989f35a80909070603h57867000s78f34c83ae6605c5@mail.gmail.com> <989f35a80909091542p3c882630yd97c38a84712f84@mail.gmail.com> From: Ted Dunning Date: Thu, 10 Sep 2009 00:20:06 -0700 Message-ID: Subject: Re: Taste-GenericItemBasedRecommender To: mahout-user@lucene.apache.org Content-Type: multipart/alternative; boundary=000e0cd4866c9123d2047334088a X-Virus-Checked: Checked by ClamAV on apache.org --000e0cd4866c9123d2047334088a Content-Type: text/plain; charset=UTF-8 Yes. And this last operation is only separate because it so often needs access to row sums and overall totals. It could be inserted into the first MR step at the cost of clarity. On Wed, Sep 9, 2009 at 8:48 PM, Sean Owen wrote: > Yes -- that second mapreduce is the real question! is there such a > parallelizable black box that transforms the matrix multiply result > into recommendations? I'm guessing there is indeed a matrix that makes > the result into useful similarity weights, then this can be finished > off by multiplying by the user rating vector. > -- Ted Dunning, CTO DeepDyve --000e0cd4866c9123d2047334088a--