I just take a short look at the file. Maybe thats because all Users own
all Collors - so there is nothing to recommend. Delete some Item for the
User the recommendation is made for and you should get some
recommendations.
Laya Patwa schrieb:
Did you get any recommendations?
The preferences are different for each user in tdata.txt. In testdata.csv
the preferences are all 1, but the items are different for each user. I
think the pearson correlation is working, because the nearest n user list is
working and the code generates the nearest n user list.
On Wed, Jul 15, 2009 at 12:16 PM, Sean Owen <[email protected]> wrote:
OK, hmm well it was kind of a long shot anyway. It should have worked even
so.
I see one data file attached. There are some blank lines at the top,
though I don't think that will matter.
You are putting quotes around the names. That means the item IDs have
quotes in their names, which is not what I think you intend. For
example, you do not have an item named 'red', you have an item named
'"red"' in your model. If you are looking for recommendations that
include the item 'red' you will not find any. But somehow I suspect
this is not the problem you are talking about.
What algorithm are you using -- one involving a correlation-based
similarity metric like Pearson? I ask because most of your ratings
have exactly the same rating, which will cause correlations to be
undefined in some cases. You also have relatively little data. It may
be that there are simply few or no defined similarities between users
in the model and so no recommendations can be made.
Add more, or more realistic, data and you should see better results
perhaps.
But I still then can't explain why two copies of the same file give
different results. I might have to see the code.
Yes do not send anything confidential.
On Wed, Jul 15, 2009 at 11:10 AM, Laya Patwa<[email protected]>
wrote:
Hey!
I followed your instructions. It doesn't work even when I put each file
in
separate directory.
Maybe you should have a look at the code and the data files. I am
attaching
2 of the data files. I need to get permission for the 3rd one( it is also
a
bit larger ). The code is almost the same as given in the documentation.
It
is giving recommendations for the file testdata.csv.
Cheers,
Laya
On Wed, Jul 15, 2009 at 11:43 AM, Sean Owen <[email protected]> wrote:
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<[email protected]>
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
