[jira] [Commented] (SPARK-10078) Vector-free L-BFGS

["Seth Hendrickson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-10078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15793488#comment-15793488 ] 

Seth Hendrickson commented on SPARK-10078:
------------------------------------------

[~yanboliang] I was a bit confused by the following comment under new requirements for VL-BFGS:

"API consistency with Breeze L-BFGS so we can migrate existing code smoothly."

What existing code are we migrating, and to where/what? Are we planning to replace the use of the Breeze LBFGS solvers with this VL-BFGS implementation? If so, what about the numerous use cases that do not need to partition by features? Thanks!

> Vector-free L-BFGS
> ------------------
>
>                 Key: SPARK-10078
>                 URL: https://issues.apache.org/jira/browse/SPARK-10078
>             Project: Spark
>          Issue Type: New Feature
>          Components: ML
>            Reporter: Xiangrui Meng
>            Assignee: Yanbo Liang
>
> This is to implement a scalable version of vector-free L-BFGS (http://papers.nips.cc/paper/5333-large-scale-l-bfgs-using-mapreduce.pdf).
> Design document:
> https://docs.google.com/document/d/1VGKxhg-D-6-vZGUAZ93l3ze2f3LBvTjfHRFVpX68kaw/edit?usp=sharing



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