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layout: global
title: Advanced topics - spark.ml
displayTitle: Advanced topics - spark.ml
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# Optimization of linear methods
The optimization algorithm underlying the implementation is called
[Orthant-Wise Limited-memory
QuasiNewton](http://research-srv.microsoft.com/en-us/um/people/jfgao/paper/icml07scalable.pdf)
(OWL-QN). It is an extension of L-BFGS that can effectively handle L1
regularization and elastic net.
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