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Excellent free e-book from Stanford on machine learning and Hadoop - Mahout - [mail # user]
...http://infolab.stanford.edu/~ullman/mmds.html  "Mining of Massive Data Sets" A must-read for any Mahout user. It's got some basic intro to Hadoop, and recipes for common stuff like join...
   Author: Sean Owen , 2011-01-01, 01:03
[expand - 1 more] - same estimated pref values - Mahout - [mail # user]
...My first 'guess', not knowing all the details, is that it sounds like the similarity metric is not showing a similarity for many pairs of items. The item-item connections are few and far bet...
   Author: Sean Owen , 2011-01-01, 00:49
[expand - 1 more] - Taste: real-time no go - distributed pre-computing? - Mahout - [mail # user]
...Not surprised. It is still roughly an O(n^3) algorithm (n = number of users).  A lower number will increase speed. You might want something far lower like 0.05.  One other way to s...
   Author: Sean Owen , 2008-11-02, 14:22
Memory problems with KMeans - Mahout - [mail # user]
...You're not setting -Xmx1024m, for example, to increase the max heap size (unless somehow these other options imply that.) Try that?  In general I'd say don't bother messing too much wit...
   Author: Sean Owen , 2008-11-13, 17:29
[expand - 3 more] - Recommending when working with binary data sets - Mahout - [mail # user]
...On Tue, Sep 30, 2008 at 7:55 PM, Otis Gospodnetic  wrote: > I think their algo then translates to: > > for item i1 in {1, 2, 3 ...100} { >  for item i2 in {1, 10, 20} {...
   Author: Sean Owen , 2008-10-01, 11:18
[expand - 1 more] - What are the business cases for collaborative filtering? - Mahout - [mail # user]
...I mentioned this to Otis but thought I'd expand it --  As some of you may know I am actually an MBA student. I have worked on the collaborative filtering portion of Mahout (formerly cal...
   Author: Sean Owen , 2008-10-09, 12:34
collecting data (was Re: What are the business cases for collaborative filtering?) - Mahout - [mail # user]
...On Sun, Oct 12, 2008 at 8:47 AM, Ian Holsman  wrote: > right.. we have put our 'real time' portion on the side lines for the > moment, and are have hadoop jobs running every X min...
   Author: Sean Owen , 2008-10-13, 08:08
[expand - 1 more] - Inconsistent recommendations - Mahout - [mail # user]
...Yeah that's what it's about -- skipping some randomly-selected stuff, which changes the input to the calculations and potentially changes its output. It's about speed. It doesn't 'permanentl...
   Author: Sean Owen , 2009-06-03, 20:17
[expand - 1 more] - Re : Help with Installation Instructions - Mahout - [mail # user]
...LoadTest is my department. Do you have any stack trace or other output? It would under core/target/surefire-reports. Normally it only fails from running too slowly, but, perhaps it hit some ...
   Author: Sean Owen , 2009-06-09, 07:47
Any utility to solve the matrix inversion in Map/Reduce Way - Mahout - [mail # user]
...And, do you really need an inverse, or pseudo-inverse? But, no, there are really no direct utilities for this. But we could probably tell you how to do it efficiently, as long as you don't a...
   Author: Sean Owen , 2013-01-18, 12:10