Sean, Grant, I'm happy to provide the code that creates the DataModel if you can tell me exactly what files to send. But I followed http://lucene.apache.org/mahout/taste.html#demo pretty literally (one exception, below), so whatever that code is should be exactly what those instructions intend.
The exception is that those instructions specified that the GroupLens ratings.dat and movies.dat files live in one place, but the demo wanted them in addition in some other place (I forget the exact path, but it was obvious from the error message). So I added symbolic links. It just occurred to me that the instructions talked about ratings.dat and movies.dat, but did not mention users.dat. I wonder if copying that will let the demo work? I'll try that in a minute. > Date: Thu, 28 May 2009 12:00:44 +0100 > Subject: Re: taste-web example booboo > From: [email protected] > To: [email protected] > > The cause is that the DataModel has no items. (I will improve the > error checking to produce a better error.) So there is some problem in > loading up the DataModel. It seems to have succeeded but didn't load > anything? weird. If you can, provide the code that creates the > DataModel? > > On Wed, May 27, 2009 at 10:54 PM, Jack Tanner wrote: >> >> I'm trying to run the taste-web example using mahout 0.1 and the grouplens >> dataset. All the steps here went fine: >> >> http://lucene.apache.org/mahout/taste.html#demo >> But now I get: >> >> Problem accessing /mahout-taste-webapp/RecommenderServlet. Reason: >> size must be at least 1 >> Caused by:java.lang.IllegalArgumentException: size must be at least 1 >> at org.apache.mahout.cf.taste.impl.common.FastSet.(FastSet.java:68) >> at >> org.apache.mahout.cf.taste.impl.recommender.slopeone.MemoryDiffStorage.(MemoryDiffStorage.java:110) _________________________________________________________________ Insert movie times and more without leaving Hotmail®. http://windowslive.com/Tutorial/Hotmail/QuickAdd?ocid=TXT_TAGLM_WL_HM_Tutorial_QuickAdd1_052009
