Let me figure out how to do this and add Aditya as the owner of that JIRA. My initial attempts in ASF infra-land were not quite successful.
Frank On Mon, Mar 28, 2016 at 4:54 PM, Rahul Iyer <ri...@pivotal.io> wrote: > @Frank, Roman: I believe Aditya needs to be added as a developer to the > MADlib project to assign a JIRA to him? Is this only available to the > lead/owner? > > On Mon, Mar 28, 2016 at 3:49 PM, Aditya Nain <adityana...@gmail.com> > wrote: > >> Hi Rahul, >> >> I didn't have an id, so I created one now. >> My id is : Aditya Nain >> >> Thanks, >> Aditya >> >> On Mon, Mar 28, 2016 at 6:40 PM, Rahul Iyer <ri...@pivotal.io> wrote: >> >> > I can assign this to you, but you need to have an account in >> > https://issues.apache.org. >> > If you already have an account, then please send your id - I wasn't >> able to >> > find you just using your name. >> > >> > On Mon, Mar 28, 2016 at 3:31 PM, Aditya Nain <adityana...@gmail.com> >> > wrote: >> > >> > > Hi Rahul, >> > > >> > > Thanks for the reply! >> > > >> > > I am working on implementing Gaussian Mixture Model assuming that the >> > > co-variance matrix is same for all the Gaussians. >> > > The JIRA which deals GMM is MADBLIB-410: >> > > >> > >> https://issues.apache.org/jira/browse/MADLIB-410?jql=project%20%3D%20MADLIB >> > > >> > > Can this be assigned to me, or how do I get it assigned to me? >> > > >> > > Thanks, >> > > Aditya >> > > >> > > On Mon, Mar 21, 2016 at 3:41 PM, Rahul Iyer <ri...@pivotal.io> wrote: >> > > >> > > > Hi Aditya, >> > > > >> > > > Welcome to the MADlib community! >> > > > >> > > > Gaussian Mixture models is extrememly useful and we would heartily >> > > welcome >> > > > a contribution for it. The SQLEM paper might be oversimplifying the >> > > > capabilities of the database (e.g. assuming there is no array type >> is >> > > > unnecessary for Postgresql). You could speed things (both dev time >> and >> > > > execution time) by writing some of the functions in C++. K-means is >> an >> > > > example of how clustering is implemented. >> > > > IMO, assuming the same covariance matrix is reasonable. We could >> extend >> > > the >> > > > capabilities after the initial implementation is complete. >> > > > >> > > > There was some work started a long time ago that built perceptrons >> > using >> > > > the convex framework (link < >> https://github.com/iyerr3/madlib/tree/mlp >> > >). >> > > > There are still some bugs in that code since the trained network >> isn't >> > > > converging. You could start there or build a new module - either >> ways >> > an >> > > > MLP module is frequently demanded by the data science community. >> > > > >> > > > I would suggest starting with Gaussian mixtures and then moving to >> > > > perceptrons if GMM work is completed. >> > > > >> > > > Feel free to ask questions on this forum. Looking forward to >> > > collaborating >> > > > with you. >> > > > >> > > > Best, >> > > > Rahul >> > > > >> > > > On Thu, Mar 17, 2016 at 2:08 PM, Aditya Nain <adityana...@gmail.com >> > >> > > > wrote: >> > > > >> > > > > Hi, >> > > > > >> > > > > My name is Aditya Nain, and I am a graduate student at University >> of >> > > > > Florida. >> > > > > I have been learning MADLib for a while and want to contribute to >> > > MADLib. >> > > > > I went through some of the open stories in JIRA and started >> working >> > on >> > > > > MADLIB-410 : >> > > > > >> > > > > >> > > > >> > > >> > >> https://issues.apache.org/jira/browse/MADLIB-410?jql=project%20%3D%20MADLIB >> > > > > >> > > > > which is about implementing Gaussian Mixture Model using >> Expectation >> > > > > Maximization (EM) algorithm. >> > > > > >> > > > > I came across the following paper while searching for distributed >> EM >> > > > > algorithm which can be implemented in MADLib. >> > > > > >> > > > > Carlos Ordonez, Paul Cereghini "SQLEM: fast clustering in SQL >> using >> > the >> > > > EM >> > > > > algorithm" ACM SIGMOD Record, Volume 29 Issue 2, June 2000 Pages >> > > 559-570. >> > > > > http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.28.7564 >> > > > > >> > > > > I thought of implementing the approach discussed in the paper, but >> > the >> > > > > paper makes an assumption that the covariance martix is the same >> for >> > > all >> > > > > the clusters ( i.e covariance matrix is same for all the Gaussian >> > > > > distributions). So, I wanted to know the opinion of the community >> if >> > > it's >> > > > > fine to go with the assumption made in the paper and implement it >> in >> > > > > MADLib. >> > > > > >> > > > > Also, currently MADLib doesn't have an implementation of a >> > perceptron, >> > > > nor >> > > > > did I find any open story related to it in JIRA. I came across the >> > > > > following paper, which talks about a distributed algorithm for >> > > > perceptron : >> > > > > >> > > > > Ryan McDonald, Keith Hall, Gideon Mann "Distributed training >> > strategies >> > > > for >> > > > > the structured perceptron" >> > > > > http://dl.acm.org/citation.cfm?id=1858068 >> > > > > >> > > > > Would it useful to have a distributed implementaion of perceptron >> in >> > > > > MADlib? >> > > > > >> > > > > Thanks, >> > > > > Aditya >> > > > > >> > > > >> > > >> > >> > >
