Hi, all:
I try to user mahout api to make recommendations, but I find some userId
has no recommendations, why?
here is my code
public static void main(String args[]) throws Exception {
String inFile = "F:\\hadoop\\data\\recsysinput.txt";
DataModel dataModel = new FileDataModel(new
Hi, all:
I try to user mahout api to make recommendations, but I find some userId
has no recommendations, why?
here is my code
public static void main(String args[]) throws Exception {
String inFile = "F:\\hadoop\\data\\recsysinput.txt";
DataModel dataModel = new FileDataModel(new
hi, does anybody have suggestions for this question
Thanks!
Regards
Jiang
2014-02-12 11:25 GMT+08:00 jiangwen jiang :
> Hi, all:
>
> I try to user mahout api to make recommendations, but I find some userId
> has no recommendations, why?
>
> here is my code
> public static void main(String args[
5 should get 107 as a recommendation, whether user-based or item-based.
No clue why you're not getting it.
On Wed, Feb 12, 2014 at 11:50 PM, jiangwen jiang wrote:
> Hi, all:
>
> I try to user mahout api to make recommendations, but I find some userId
> has no recommendations, why?
>
> here is m
user 5 has given rating for all 5 books,
So there will be no recommendations for him.
On 12 February 2014 08:55, jiangwen jiang wrote:
> Hi, all:
>
> I try to user mahout api to make recommendations, but I find some userId
> has no recommendations, why?
>
> here is my code
> public static void
Hi Jiang,
Mahout's userbased recommender make use of similarity of a user with other
users to arrive at what to recommend to him & in this specific case,uses
Pearson correlation coefficient calculated from the user ratings as a
similarity measure to form a neighborhood.It then estimates ratings fo
In some cases users might not get any recommendations. There might be
different reasons of this. In your case there is only item 107 which
can be recommended to user 5 (since user 5 rated all other items).
Item 107 got two ratings which are both 5. In this case pearson
correlation between this item
User 3 gave a recommendation to item 107.
User 5 did not rate 107.
On Thu, Feb 13, 2014 at 1:57 AM, Suresh M wrote:
> user 5 has given rating for all 5 books,
> So there will be no recommendations for him.
>
>
>
> On 12 February 2014 08:55, jiangwen jiang wrote:
>
> > Hi, all:
> >
> > I try to
I guess you would get a 107 as a recommendation for 5
if you switched to user-based?
On Thu, Feb 13, 2014 at 8:21 AM, Koobas wrote:
> User 3 gave a recommendation to item 107.
> User 5 did not rate 107.
>
>
> On Thu, Feb 13, 2014 at 1:57 AM, Suresh M wrote:
>
>> user 5 has given rating for all
You are right Koobas, my answer was on the assumption that item-based
NN is used (but I noticed that user-based NN is being used). So my
answer is not correct, sorry.
Currently, I could not understand the exact reason why user 5 is not
getting any recommendations, as you said user 5 should get 107.
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