Return-Path: Delivered-To: apmail-mahout-user-archive@www.apache.org Received: (qmail 34591 invoked from network); 6 Mar 2011 21:24:20 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 6 Mar 2011 21:24:20 -0000 Received: (qmail 67255 invoked by uid 500); 6 Mar 2011 21:24:19 -0000 Delivered-To: apmail-mahout-user-archive@mahout.apache.org Received: (qmail 67223 invoked by uid 500); 6 Mar 2011 21:24:19 -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 67213 invoked by uid 99); 6 Mar 2011 21:24:19 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 06 Mar 2011 21:24:19 +0000 X-ASF-Spam-Status: No, hits=-0.7 required=5.0 tests=FREEMAIL_FROM,RCVD_IN_DNSWL_LOW,RFC_ABUSE_POST,SPF_PASS,T_TO_NO_BRKTS_FREEMAIL X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of ssc.open@googlemail.com designates 209.85.214.42 as permitted sender) Received: from [209.85.214.42] (HELO mail-bw0-f42.google.com) (209.85.214.42) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 06 Mar 2011 21:24:11 +0000 Received: by bwz13 with SMTP id 13so5345967bwz.1 for ; Sun, 06 Mar 2011 13:23:50 -0800 (PST) Received: by 10.204.117.138 with SMTP id r10mr2756166bkq.8.1299446630158; Sun, 06 Mar 2011 13:23:50 -0800 (PST) Received: from [192.168.0.107] (f052132247.adsl.alicedsl.de [78.52.132.247]) by mx.google.com with ESMTPS id f20sm1303831bkf.4.2011.03.06.13.23.48 (version=SSLv3 cipher=OTHER); Sun, 06 Mar 2011 13:23:49 -0800 (PST) Message-ID: <4D73FB5A.3050906@apache.org> Date: Sun, 06 Mar 2011 22:23:38 +0100 From: Sebastian Schelter Reply-To: ssc@apache.org User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.14) Gecko/20110223 Thunderbird/3.1.8 MIME-Version: 1.0 To: user@mahout.apache.org Subject: Re: Boolean recommendations References: <4D73F9F3.1000507@gmail.com> In-Reply-To: <4D73F9F3.1000507@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi Mark, you can precompute the item-similarities on Hadoop using ItemSimilarityJob and load them via FileItemSimilarity into your recommender afterwards. You can also try out different implementations of CandidateItemsStrategy with your recommender. --sebastian On 06.03.2011 22:17, Mark wrote: > I have about 20 million boolean preferences and I am trying to suggest > some recommendations using a GenericBooleanPrefItemBasedRecommender > with a LogLikelihoodSimilarity. The results that are returned aren't > terrible, however it takes up to a minute for each recommendation. > > Unique users: ~ 600k > Unique items: ~ 15m > > Is there anything I can do to speed this up? Thanks