DenseMatrix double[][]

[Murariu Fabian <mu...@gmail.com>]

Hi,

I'm quite new to the mahout source code and as I see the current matrix
implementation is rather inefficient since double dimensional arrays in
java are not continuously allocated. Are there any plans to use some
external matrix implementation? Am I looking in the wrong place? Is this a
good place to start if I want to implement a different kind of dense matrix?

Best regards,
Fabian

Re: DenseMatrix double[][]

[Ted Dunning <te...@gmail.com>]

There have been off and on discussions of this for some time.  Mahout was
intended to be (a) extensible and (b) focussed more on sparse matrices.
 This means that adding new implementations such as you suggest is quite
feasible and may be quite a speedup.

If you search the email archives [1] for jblas you will likely find some of
the discussions I mean.  I seen no JIRA entries [2] at this time to address
your thoughts.

[1] http://bit.ly/mahout-mailing-list-jblas
[2] http://bit.ly/mahout-issues-with-jblas
[3] https://mahout.apache.org/users/sparkbindings/home.html



On Sun, Sep 14, 2014 at 10:11 AM, Murariu Fabian <mu...@gmail.com>
wrote:

> Hi,
>
> I'm quite new to the mahout source code and as I see the current matrix
> implementation is rather inefficient since double dimensional arrays in
> java are not continuously allocated. Are there any plans to use some
> external matrix implementation? Am I looking in the wrong place? Is this a
> good place to start if I want to implement a different kind of dense
> matrix?
>
> Best regards,
> Fabian
>