Sam Halliday a écrit : > Edward, Hama looks fantastic! I fully agree, 'distributed' isn't agreeable > with commons-math. However, there might be parts of it that are relevant to > Hama.
Is Hama related to Hadoop ? > > We should absolutely ensure that the "ducks are aligned" between > commons-math and Hama. It would be win-win if Hama were able to use > commons-math's linear interfaces. commons-math will hopefully be moving to > use a netlib-java style backend (not user facing), we should ensure that > ScaLAPACK is handled in the same way. > > I have some ideas of people who might be interested... I've encountered them > as maintainer of MTJ, but never worked with them. I'll dig through my e-mail > archive and make the intros. > > > Edward J. Yoon-2 wrote: >> That's really cool. >> >> BTW, Can I ask about the plan of data distribution strategies of your >> 'distributed' package in the future? IMO, it seems, it doesn't sit >> well with 'common-math' project. >> >> If if there is a developer who wants to implement 'distributed', pls >> let us know, too. I'm working for the Hama >> (http://incubator.apache.org/hama) with ScaLAPACK members. >> >> On Thu, May 14, 2009 at 7:18 PM, Sam Halliday <sam.halli...@gmail.com> >> wrote: >>> Dear all, >>> >>> I am a maintainer of the matrix-toolkits-java >>> >>> http://code.google.com/p/matrix-toolkits-java/ >>> >>> which is a comprehensive collection of matrix data structures, linear >>> solvers, least squares methods, eigenvalue and singular value >>> decompositions. >>> >>> This note is in regard to the commons-math library. It is clear that our >>> projects dovetail, especially when I look at "linear" in version 2.0 of >>> the >>> API. It would be good if we could either complement or consolidate >>> efforts, >>> rather than reproduce. >>> >>> It would be excellent if all the functionality of matrix-toolkits-java >>> were >>> available as part of commons-math. There is already too much diversity >>> and >>> un-maintained maths code out there for Java! >>> >>> As a start, I'd like to discourage the use of a solid implementation for >>> SparseReal{Vector, Matrix}... please prefer an interface approach, >>> allowing >>> implementations based on the Templates project:- >>> >>> http://www.netlib.org/templates >>> >>> The reason is that the storage implementation should be related to the >>> type >>> of data being stored. For example, there are many well-known kinds of >>> sparse >>> matrix that are well suited to particular kinds of calculations... >>> consider >>> multiplying sparse matrices that you know to be diagonal! >>> >>> In general, the netlib.org folk (BLAS/LAPACK) have spent a *lot* of time >>> thinking about linear algebra and have set up unrivalled standard APIs >>> which >>> have been implemented right down to the architecture level. It would be a >>> major mistake if commons-math didn't build on their good work. >>> >>> I believe commons-math should move to a netlib-java backend (allowing the >>> use of machine optimised BLAS/LAPACK). >>> >>> http://code.google.com/p/netlib-java/ >>> >>> The largest problems facing MTJ are support for Sparse BLAS/LAPACK and >>> scalability to parallel architectures which use Parallel BLAS/LAPACK. The >>> former should be possible with some work within the current API, but I >>> fear >>> major API changes would be needed for the latter. I do not want the >>> commons-math API to walk into this trap without having first considered >>> future architectures! MTJ has a distributed package, but I am not sure if >>> this is something that is completely future proof either. >>> >>> What say ye'? >>> >>> -- >>> Sam >>> >>> -- >>> View this message in context: >>> http://www.nabble.com/commons-math%2C-matrix-toolkits-java-and-consolidation-tp23537813p23537813.html >>> Sent from the Commons - Dev mailing list archive at Nabble.com. >>> >>> >>> --------------------------------------------------------------------- >>> To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org >>> For additional commands, e-mail: dev-h...@commons.apache.org >>> >>> >> >> >> -- >> Best Regards, Edward J. Yoon @ NHN, corp. >> edwardy...@apache.org >> http://blog.udanax.org >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org >> For additional commands, e-mail: dev-h...@commons.apache.org >> >> >> > --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
