Return-Path: Delivered-To: apmail-mahout-user-archive@www.apache.org Received: (qmail 84010 invoked from network); 25 Feb 2011 22:30:10 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 25 Feb 2011 22:30:10 -0000 Received: (qmail 44089 invoked by uid 500); 25 Feb 2011 22:30:09 -0000 Delivered-To: apmail-mahout-user-archive@mahout.apache.org Received: (qmail 44032 invoked by uid 500); 25 Feb 2011 22:30:08 -0000 Mailing-List: contact user-help@mahout.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@mahout.apache.org Delivered-To: mailing list user@mahout.apache.org Received: (qmail 44023 invoked by uid 99); 25 Feb 2011 22:30:08 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 25 Feb 2011 22:30:08 +0000 X-ASF-Spam-Status: No, hits=2.2 required=5.0 tests=FREEMAIL_FROM,HTML_MESSAGE,RCVD_IN_DNSWL_NONE,SPF_PASS,T_TO_NO_BRKTS_FREEMAIL X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of ted.dunning@gmail.com designates 209.85.220.170 as permitted sender) Received: from [209.85.220.170] (HELO mail-vx0-f170.google.com) (209.85.220.170) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 25 Feb 2011 22:30:00 +0000 Received: by vxb39 with SMTP id 39so3363052vxb.1 for ; Fri, 25 Feb 2011 14:29:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc:content-type; bh=VxqrBKMperjz3HfLAZHBCCYKgX1Dx6Y6H9512G0EvV4=; b=v0rFoKB8Z4JDdqah2wZDt237tpC+mHyNi7q9Ffvdz4KkKbci4kAxLzB+HnbEmJEX7v dFqhRc/cuTRJSLNNudHZQ6gfyHKHvi+s+yd5KyUaibwnD+dn0Gtp3e9DS/aXgo4gJoSR zoMIFQC1VpckxBvHnmTNCVc4Omdy3+Kaxriew= 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 :cc:content-type; b=mexhctOSuLvg7EIfs0pB6NpNIMfjZDQnRMOiWOFs5PwaSVK4EwsjfbQg+YUpTk/GQe XRZZ6uRx2QOO9bHkjflykHFr2QpOXXoNkl1Hme/8qTXCs420ooTzJ8njcyJRTcBawCVZ GN2XlqTJs2zDUZ9jGym3JjT4aBjesCnHm1cds= Received: by 10.52.96.161 with SMTP id dt1mr331vdb.253.1298672969181; Fri, 25 Feb 2011 14:29:29 -0800 (PST) MIME-Version: 1.0 Received: by 10.52.158.4 with HTTP; Fri, 25 Feb 2011 14:25:55 -0800 (PST) In-Reply-To: References: <2208.51655.qm@web36106.mail.mud.yahoo.com> From: Ted Dunning Date: Fri, 25 Feb 2011 14:25:55 -0800 Message-ID: Subject: Re: Understanding Mahout's Hadoop SVD results - eigenvectors/values vs decomposed matrices To: user@mahout.apache.org Cc: Dmitriy Lyubimov Content-Type: multipart/alternative; boundary=20cf307f370e01e7f9049d22dd0a X-Virus-Checked: Checked by ClamAV on apache.org --20cf307f370e01e7f9049d22dd0a Content-Type: text/plain; charset=UTF-8 I don't think we have a single method for this, but it would be very easy to implement. On Fri, Feb 25, 2011 at 1:21 PM, Dmitriy Lyubimov wrote: > Ok, thank you, Ted. > > The reason i am actually asking is fold-in jobs in LSI which are basically > very similar operation (multiplication + scaling). Because if you could do > it with DRM > method, i would just need to describe what to call or run. Sorry for the > offtopic. > > -Dmitriy > > On Fri, Feb 25, 2011 at 1:05 PM, Ted Dunning > wrote: > > > I think that lanczos may already do this. The correction for the > diagonal > > matrix just involves weighting the output rows as they are produced. I > > don't know that is in any explicit code. You may not even want it if you > > want to get scaled left (right) eigenvectors. > > > --20cf307f370e01e7f9049d22dd0a--