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From Szabó Péter <nemderogator...@gmail.com>
Subject Re: [DISCUSS] Iterative streaming example
Date Fri, 27 Feb 2015 08:24:49 GMT
Cool! At the moment I don't have any good use cases, but I will read some
literature about it in the near future. The first priority for me is to
make a good streaming iteration example, and Márton liked the
machine-learning idea. That, and there is a group in SZTAKI that develops
recommendation systems and we'd like to cooperate in order to implement
some of their algorithms in Flink Streaming.


2015-02-26 23:30 GMT+01:00 Paris Carbone <parisc@kth.se>:

> We haven’t yet implemented any of these machine learning models directly
> on the Flink api but we have run them through the existing Samoa tasks,
> using Flink Streaming as a backend. Apart from it we have a student looking
> into machine learning pipelines on Flink Streaming with a focus on
> iterative jobs so we will have many more use cases coming soon. Are you
> also considering looking into something similar? Perhaps I can help more if
> you have some specific use case in mind.
> Paris
> On 23 Feb 2015, at 14:29, Szabó Péter <nemderogatorius@gmail.com<mailto:
> nemderogatorius@gmail.com>> wrote:
> Nice. Thank you guys!
> @Paris
> Are there any Flink implementations of this model? The GitHub doc is quite
> general.
> Peter
> 2015-02-23 14:05 GMT+01:00 Paris Carbone <parisc@kth.se<mailto:
> parisc@kth.se>>:
> Hello Peter,
> Streaming machine learning algorithms make use of iterations quite widely.
> One simple example is implementing distributed stream learners. There, in
> many cases you need some central model aggregator, distributed estimators
> to offload the central node and of course feedback loops to merge
> everything back to the main aggregator periodically. One such example in
> the Vertical Hoeffding Tree Classifier (VFDT) [1] that is implemented in
> Samoa.
> Iterative streams are also useful for optimisation techniques as in batch
> processing (eg. trying different parameters to estimate a variable, getting
> back the accuracy from an evaluator and repeating until a condition is
> achieved).
> I hope this helps to get a general idea of where iterations can be used.
> [1] https://github.com/yahoo/samoa/wiki/Vertical-Hoeffding-Tree-Classifier
> On 23 Feb 2015, at 12:13, Stephan Ewen <sewen@apache.org<mailto:
> sewen@apache.org><mailto:
> sewen@apache.org<mailto:sewen@apache.org>>> wrote:
> I think that the Samoa people have quite a few nice examples along the
> lines of model training with feedback.
> @Paris: What would be the simplest example?
> On Mon, Feb 23, 2015 at 11:27 AM, Szabó Péter <nemderogatorius@gmail.com
> <mailto:nemderogatorius@gmail.com>
> <mailto:nemderogatorius@gmail.com>>
> wrote:
> Does everyone know of a good, simple and realistic streaming iteration
> example? The current example tests a random generator, but it should be
> replaced by something deterministic in order to be testable.
> Peter

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