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From Ameet Talwalkar <>
Subject Re: Spark Matrix Factorization
Date Fri, 03 Jan 2014 00:06:57 GMT
Hi Deb,

Thanks for your email.  We currently do not have a DSGD implementation in
MLlib. Also, just to clarify, DSGD is not a variant of ALS, but rather a
different algorithm for solving the same the same bi-convex objective

It would be a good thing to do add, but to the best of my knowledge, no one
is actively working on this right now.

Also, as you mentioned, the ALS implementation in mllib is more
robust/scalable than the one in spark.examples.


On Thu, Jan 2, 2014 at 3:16 PM, Debasish Das <>wrote:

> Hi,
> I am not noticing any DSGD implementation of ALS in Spark.
> There are two ALS implementations.
> org.apache.spark.examples.SparkALS does not run on large matrices and
> seems more like a demo code.
> org.apache.spark.mllib.recommendation.ALS looks feels more robust version
> and I am experimenting with it.
> References here are Jellyfish, Twitter's implementation of Jellyfish
> called Scalafish, Google paper called Sparkler and similar idea put forward
> by IBM paper by Gemulla et al. (large-scale matrix factorization with
> distributed stochastic gradient descent)
> Are there any plans of adding DSGD in Spark or there are any existing JIRA
> ?
> Thanks.
> Deb

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