It's perfectly fine. That way you will construct a data flow graph which
will calculate the linear model for all different groups once you define an
output and trigger the execution.
On Thu, Jul 9, 2015 at 6:05 PM, Felix Neutatz <neut...@googlemail.com>
wrote:
> The problem is that I am not able to incorporate this into a Flink
> iteration since the MultipleLinearRegression() already contains an
> iteration. Therefore this would be a nested iteration ;-)
>
> So at the moment I just use a for loop like this:
>
> data: DataSet[model_ID, DataVector]
>
> for (current_model_ID <- uniqueModel_IDs){
>
> trainingDS = data.filter(t => t.model_ID == current_model_ID).map(t =>
> t.DataVector)
>
> val mlr = MultipleLinearRegression()
>
> .setIterations(10)
> .setStepsize(stepsize)
>
> mlr.fit(trainingDS)
>
> mlr.predict()
>
> ...
>
> }
>
> Is there a more efficient way to do this?
>
> Thank you for your help,
>
> Felix
>
>
>
>
> 2015-07-08 10:58 GMT+02:00 Till Rohrmann <trohrm...@apache.org>:
>
> > Yes it is. But you can still run the calculation in parallel because
> `fit`
> > does not trigger the execution of the job graph. It simply builds the
> data
> > flow. Only if you call `predict` or collect the weights, it is executed.
> >
> > Cheers,
> > Till
> >
> > On Wed, Jul 8, 2015 at 10:52 AM, Felix Neutatz <neut...@googlemail.com>
> > wrote:
> >
> > > Thanks for the information Till :)
> > >
> > > So at the moment the iteration is the only way.
> > >
> > > Best regards,
> > > Felix
> > >
> > > 2015-07-08 10:43 GMT+02:00 Till Rohrmann <trohrm...@apache.org>:
> > >
> > > > Hi Felix,
> > > >
> > > > this is currently not supported by FlinkML. The
> > MultipleLinearRegression
> > > > algorithm expects a DataSet and not a GroupedDataSet as input. What
> you
> > > can
> > > > do is to extract each group from the original DataSet by using a
> filter
> > > > operation. Once you have done this, you can train the linear model on
> > > each
> > > > sub part of the DataSet.
> > > >
> > > > Cheers,
> > > > Till
> > > >
> > > >
> > > > On Wed, Jul 8, 2015 at 10:37 AM, Felix Neutatz <
> neut...@googlemail.com
> > >
> > > > wrote:
> > > >
> > > > > Hi Felix,
> > > > >
> > > > > thanks for the idea. But doesn't this mean that I can only train
> one
> > > > model
> > > > > per partition? The thing is, I have way more models than that :(
> > > > >
> > > > > Best regards,
> > > > > Felix
> > > > >
> > > > > 2015-07-07 22:37 GMT+02:00 Felix Schüler <fschue...@posteo.de>:
> > > > >
> > > > > > Hi Felix!
> > > > > >
> > > > > > We had a similar usecase and I trained multiple models on
> > partitions
> > > of
> > > > > > my data with mapPartition and the model-parameters (weights) as
> > > > > > broadcast variable. If I understood broadcast variables in Flink
> > > > > > correctly, you should end up with one model on each TaskManager.
> > > > > >
> > > > > > Does that work?
> > > > > >
> > > > > > Felix
> > > > > >
> > > > > > Am 07.07.2015 um 17:32 schrieb Felix Neutatz:
> > > > > > > Hi,
> > > > > > >
> > > > > > > at the moment I have a dataset which looks like this:
> > > > > > >
> > > > > > > DataSet[model_ID, DataVector] data
> > > > > > >
> > > > > > > So what I want to do is group by the model_ID and build for
> each
> > > > > model_ID
> > > > > > > one regression model
> > > > > > >
> > > > > > > in pseudo code:
> > > > > > > data.groupBy(model_ID)
> > > > > > > --> MultipleLinearRegression().fit(data_grouped)
> > > > > > >
> > > > > > > Is there anyway besides an iteration how to do this at the
> > moment?
> > > > > > >
> > > > > > > Thanks for your help,
> > > > > > >
> > > > > > > Felix Neutatz
> > > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
>
