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From Sean Owen <>
Subject Re: Problem building Taste grouplens Demo
Date Sat, 07 Mar 2009 10:58:18 GMT
Great catch, that's exactly right. I think the naming scheme I set it
to look for could prove a little problematic. For the moment I
committed the fix you suggest.

On Sat, Mar 7, 2009 at 9:39 AM, Ryan Shih <> wrote:
> Hi Matt - This is actually the result of a code problem. For this example,
> it picks up your data files fine (you'll be able to verify this by taking a
> look in your temp directory on Tomcat because it will write files like
> taste.movies.txt and taste.ratings.txt that hold your GLF converted file
> after it reads it in from your classpath). However, the example currently
> has logic that will look for additional files with the same prefix as
> updates to your data. This fails, however because while taste.ratings.txt is
> a valid ratings file, it reads taste.movies.txt as an an additional update
> file but it's not and it fails to parse correctly. At the moment, it doesn't
> appear like there is a way to override this because it's hardcoded so you'll
> probably have to patch your file and rebuild.
> A quick & dirty approach that I got to work for me is by editing the
> following file & patch the following line.
> src/main/java/org/apache/mahout/cf/taste/example/grouplens/
> -                                     "taste." + (ratings ? "ratings"
> "movies") + ".txt");
> +                                     (ratings ? "ratings" : "movies")
> ".txt");

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