Re: How much does DataModel is Refreshable in cf (Collaborative Filtering)

[Gokhan Capan <gk...@gmail.com>]

Hi Darius,

FileDataModel works on a ratings file (not directory), and if you modify
this file, you may call its refresh method for the model to reload the
ratings file.

It would check if minReloadIntervalMS milliseconds passed to reload,
though. If you don't pass that argument, it defaults to 1 minute.

Best,
Gokhan


On Thu, Aug 29, 2013 at 7:23 PM, Darius Miliauskas <
dariui.miliauskui@gmail.com> wrote:

> Dear All,
>
> I guess my question would be already discussed. I found a short explanation
> in stackoverflow (
>
> http://stackoverflow.com/questions/7638400/mahouts-datamodel-with-genericdatamodel
> )
> but I would like to get more details.
>
> 1. Let's say I uploaded data from the file to DataModel. Is it the only way
> to put all data to mahout, isn't it? I did not find any other examples
> (without the usage of DataModel).
>
> 2. What's the meaning of refresh in the concept of DataModel? Is it just
> add a new piece of data to the existing DataModel or it creates a new
> DataModel from the old piece and a new piece?
>
> Can you give a simple code example how to apply the method of refresh?
>
> For example, my tries were the following:
>
> DataModel model = new FileDataModel(ratingsFile);
> <...>
> Recommender cachingRecommender = new CachingRecommender();
> cachingRecommender.refresh();
>
> or
>
> model.refresh();
>
> But where I put the parameters?
>
> 3. Can I merge a new file with a piece of new data to the old DataModel?
>
> model.refresh(newFile); or smt how to do it.
>
>
> Thanks,
>
> Darius
>

Re: How much does DataModel is Refreshable in cf (Collaborative Filtering)

[Darius Miliauskas <da...@gmail.com>]

Dear All,

thanks for the answer, Gokhan. As far as I understood the entire file is
read every time I call refresh(). So, if I have extremely big file, and
let's say I added a few lines, it would cost much time. Am I right?

Can the other questions be answered (i. e. number 1)?


Thanks,

Darius


2013/9/1 Gokhan Capan <gk...@gmail.com>

> Hi Darius,
>
> FileDataModel works on a ratings file (not directory), and if you modify
> this file, you may call its refresh method for the model to reload the
> ratings file.
>
> It would check if minReloadIntervalMS milliseconds passed to reload,
> though. If you don't pass that argument, it defaults to 1 minute.
>
> Best,
> Gokhan
>
>
> On Thu, Aug 29, 2013 at 7:23 PM, Darius Miliauskas <
> dariui.miliauskui@gmail.com> wrote:
>
> > Dear All,
> >
> > I guess my question would be already discussed. I found a short
> explanation
> > in stackoverflow (
> >
> >
> http://stackoverflow.com/questions/7638400/mahouts-datamodel-with-genericdatamodel
> > )
> > but I would like to get more details.
> >
> > 1. Let's say I uploaded data from the file to DataModel. Is it the only
> way
> > to put all data to mahout, isn't it? I did not find any other examples
> > (without the usage of DataModel).
> >
> > 2. What's the meaning of refresh in the concept of DataModel? Is it just
> > add a new piece of data to the existing DataModel or it creates a new
> > DataModel from the old piece and a new piece?
> >
> > Can you give a simple code example how to apply the method of refresh?
> >
> > For example, my tries were the following:
> >
> > DataModel model = new FileDataModel(ratingsFile);
> > <...>
> > Recommender cachingRecommender = new CachingRecommender();
> > cachingRecommender.refresh();
> >
> > or
> >
> > model.refresh();
> >
> > But where I put the parameters?
> >
> > 3. Can I merge a new file with a piece of new data to the old DataModel?
> >
> > model.refresh(newFile); or smt how to do it.
> >
> >
> > Thanks,
> >
> > Darius
> >
>