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From Sean Owen <so...@cloudera.com>
Subject Re: apply simplex method to fix linear programming in spark
Date Mon, 02 Nov 2015 18:13:05 GMT
I might be steering this a bit off topic: does this need the simplex
method? this is just an instance of nonnegative least squares. I don't
think it relates to LDA either.

Spark doesn't have any particular support for NNLS (right?) or simplex though.

On Mon, Nov 2, 2015 at 6:03 PM, Debasish Das <debasish.das83@gmail.com> wrote:
> Use breeze simplex which inturn uses apache maths simplex...if you want to
> use interior point method you can use ecos
> https://github.com/embotech/ecos-java-scala ...spark summit 2014 talk on
> quadratic solver in matrix factorization will show you example integration
> with spark. ecos runs as jni process in every executor.
>
> On Nov 1, 2015 9:52 AM, "Zhiliang Zhu" <zchl.jump@yahoo.com.invalid> wrote:
>>
>> Hi Ted Yu,
>>
>> Thanks very much for your kind reply.
>> Do you just mean that in spark there is no specific package for simplex
>> method?
>>
>> Then I may try to fix it by myself, do not decide whether it is convenient
>> to finish by spark, before finally fix it.
>>
>> Thank you,
>> Zhiliang
>>
>>
>>
>>
>> On Monday, November 2, 2015 1:43 AM, Ted Yu <yuzhihong@gmail.com> wrote:
>>
>>
>> A brief search in code base shows the following:
>>
>>     TODO: Add simplex constraints to allow alpha in (0,1).
>> ./mllib/src/main/scala/org/apache/spark/mllib/clustering/LDA.scala
>>
>> I guess the answer to your question is no.
>>
>> FYI
>>
>> On Sun, Nov 1, 2015 at 9:37 AM, Zhiliang Zhu <zchl.jump@yahoo.com.invalid>
>> wrote:
>>
>> Dear All,
>>
>> As I am facing some typical linear programming issue, and I know simplex
>> method is specific in solving LP question,
>> I am very sorry that whether there is already some mature package in spark
>> about simplex method...
>>
>> Thank you very much~
>> Best Wishes!
>> Zhiliang
>>
>>
>>
>>
>>
>

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