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https://issues.apache.org/jira/browse/FLINK-2162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14620398#comment-14620398
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Ventura Del Monte commented on FLINK-2162:
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Hi, I would like to contribute to Flink. I read the contribution guidelines. I
have already worked on Flink and I am quite familiar with its internal
components. Can I be assigned to this issue?
> Implement adaptive learning rate strategies for SGD
> ---------------------------------------------------
>
> Key: FLINK-2162
> URL: https://issues.apache.org/jira/browse/FLINK-2162
> Project: Flink
> Issue Type: Improvement
> Components: Machine Learning Library
> Reporter: Till Rohrmann
> Priority: Minor
> Labels: ML
>
> At the moment, the SGD implementation uses a simple adaptive learning rate
> strategy, {{adaptedLearningRate =
> initialLearningRate/sqrt(iterationNumber)}}, which makes the optimization
> algorithm sensitive to the setting of the {{initialLearningRate}}. If this
> value is chosen wrongly, then the SGD might become instable.
> There are better ways to calculate the learning rate [1] such as Adagrad [3],
> Adadelta [4], SGD with momentum [5] others [2]. They promise to result in
> more stable optimization algorithms which don't require so much
> hyperparameter tweaking. It might be worthwhile to investigate these
> approaches.
> It might also be interesting to look at the implementation of vowpal wabbit
> [6].
> Resources:
> [1] [http://imgur.com/a/Hqolp]
> [2] [http://cs.stanford.edu/people/karpathy/convnetjs/demo/trainers.html]
> [3] [http://www.jmlr.org/papers/volume12/duchi11a/duchi11a.pdf]
> [4] [http://www.matthewzeiler.com/pubs/googleTR2012/googleTR2012.pdf]
> [5] [http://www.willamette.edu/~gorr/classes/cs449/momrate.html]
> [6] [https://github.com/JohnLangford/vowpal_wabbit]
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