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From "Mattmann, Chris A (398J)" <chris.a.mattm...@jpl.nasa.gov>
Subject Re: Needs a matrix library
Date Sat, 07 Sep 2013 01:41:07 GMT
Thank you Shivaram!

Cheers,
Chris

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Chris Mattmann, Ph.D.
Senior Computer Scientist
NASA Jet Propulsion Laboratory Pasadena, CA 91109 USA
Office: 171-266B, Mailstop: 171-246
Email: chris.a.mattmann@nasa.gov
WWW:  http://sunset.usc.edu/~mattmann/
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Adjunct Assistant Professor, Computer Science Department
University of Southern California, Los Angeles, CA 90089 USA
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++






-----Original Message-----
From: Shivaram Venkataraman <shivaram@eecs.berkeley.edu>
Reply-To: "dev@spark.incubator.apache.org"
<dev@spark.incubator.apache.org>, "shivaram@eecs.berkeley.edu"
<shivaram@eecs.berkeley.edu>
Date: Friday, September 6, 2013 5:26 PM
To: "dev@spark.incubator.apache.org" <dev@spark.incubator.apache.org>
Cc: "dev@sis.apache.org" <dev@sis.apache.org>
Subject: Re: Needs a matrix library

>For the machine learning library that is a part of Spark 0.8 we have been
>using jblas for local matrix operations. From some limited benchmarking
>that we did, jblas is not much slower than optimized C++ libraries.
>http://blog.mikiobraun.de/2009/04/some-benchmark-numbers-for-jblas.html
>has
>some more details.
>
>For more complex operations than addition and multiplication, mahout-math
>is a pretty good library. There was a great discussion on pros/cons of
>different Java/Scala-based matrix libraries in
>https://github.com/mesos/spark/pull/736
>
>Thanks
>Shivaram
>
>
>On Fri, Sep 6, 2013 at 5:09 PM, Reynold Xin <rxin@cs.berkeley.edu> wrote:
>
>> They are asking about dedicated matrix libraries.
>>
>> Neither GraphX nor Giraph are matrix libraries. These are systems that
>> handle large scale graph processing, which could possibly be modeled as
>> matrix computations.  Hama looks like a BSP framework, so I am not sure
>>if
>> it has anything to do with matrix library either.
>>
>> For very small matrices (3x3, 4x4), the cost of going through jni to do
>> native matrix operations will likely dominate the computation itself, so
>> you are probably better off with a simple unrolled for loop in Java.
>>
>> I haven't looked into this myself, but I heard mahout-math is a decent
>> library.
>>
>> --
>> Reynold Xin, AMPLab, UC Berkeley
>> http://rxin.org
>>
>>
>>
>> On Sat, Sep 7, 2013 at 6:13 AM, Dmitriy Lyubimov <dlieu.7@gmail.com>
>> wrote:
>>
>> > keep forgetting this: what is graphx release roadmap?
>> >
>> > On Fri, Sep 6, 2013 at 3:04 PM, Konstantin Boudnik <cos@apache.org>
>> wrote:
>> > > Would it be more logical to use GraphX ?
>> > >   https://amplab.cs.berkeley.edu/publication/graphx-grades/
>> > >
>> > > Cos
>> > >
>> > > On Fri, Sep 06, 2013 at 09:13PM, Mattmann, Chris A (398J) wrote:
>> > >> Thanks Roman, I was thinking Giraph too (knew it supported graphs
>>but
>> > >> wasn't sure it supported matrices). If Giraph supports matrices,
>>big
>> +1.
>> > >>
>> > >> Cheers,
>> > >> Chris
>> > >>
>> > >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>> > >> Chris Mattmann, Ph.D.
>> > >> Senior Computer Scientist
>> > >> NASA Jet Propulsion Laboratory Pasadena, CA 91109 USA
>> > >> Office: 171-266B, Mailstop: 171-246
>> > >> Email: chris.a.mattmann@nasa.gov
>> > >> WWW:  http://sunset.usc.edu/~mattmann/
>> > >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>> > >> Adjunct Assistant Professor, Computer Science Department
>> > >> University of Southern California, Los Angeles, CA 90089 USA
>> > >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>> > >>
>> > >>
>> > >>
>> > >>
>> > >>
>> > >>
>> > >> -----Original Message-----
>> > >> From: Roman Shaposhnik <rvs@apache.org>
>> > >> Date: Friday, September 6, 2013 2:00 PM
>> > >> To: <dev@spark.incubator.apache.org>
>> > >> Cc: "dev@sis.apache.org" <dev@sis.apache.org>
>> > >> Subject: Re: Needs a matrix library
>> > >>
>> > >> >On Fri, Sep 6, 2013 at 1:33 PM, Mattmann, Chris A (398J)
>> > >> ><chris.a.mattmann@jpl.nasa.gov> wrote:
>> > >> >> Hey Martin,
>> > >> >>
>> > >> >> We may seriously consider using either Apache Hama here (which
>>will
>> > >> >> bring in Hadoop):
>> > >> >
>> > >> >On that note I'd highly recommend taking a look at Apache Giraph
>> > >> >as well: http://giraph.apache.org/
>> > >> >
>> > >> >Thanks,
>> > >> >Roman.
>> > >> >
>> > >>
>> >
>>


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