Hmm, I might have guessed there is some file encoding issues, related
to line breaks, since you say copying the file "breaks" it. But that
would explain, I think, why a copy would *work* rather than fail.

One thing to be careful of is that FileDataModel tries to be clever
and allow you to post incremental updates to the data file by placing
similarly-named files in the same directory. How have you named your
files? To rule this out, put the files in separate directories, just
to make sure.

Otherwise perhaps you can send me a sample of the data file or a
sample of your code to see what is going on.

On Wed, Jul 15, 2009 at 10:23 AM, Laya Patwa<laya1uec@iitr.ernet.in> wrote:
> Hi!
> I am a student and right now I am working on a project named CoEUD. My task
> is to build a recommender system and I am using the taste recommender
> library that comes with mahout.
>
> I downloaded the subversion and installed it using maven and cygwin on
> windows and also on MacOS. I tried the grouplens demo that is given in the
> taste documentation and it also worked. Then I tried the example for user
> based recommender, but it is giving some problems as follows:
> 1) I have 3 different data files with me and they are in CSV format having
> values of userID, itemID and preference. The recommendations are generated
> for 1 data file and not for the others. There are no errors. The program
> runs and generates an empty recommendation list for other data files
> 2)Another peculiar thing that is happening is that when I make a copy of the
> data file for which the user based recommender example is working and use
> this data file, the recommendation list generated is empty.
>
> I am stuck with the above 2 problems and can't figure out why the
> recommendations are not generated for all the data files. Can you please
> help me out.
>
> I am using eclipse.
>
> Cheers,
> Laya
>