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https://issues.apache.org/jira/browse/SPARK-3507?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiangrui Meng updated SPARK-3507:
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Fix Version/s: (was: 1.2.0)
> Create RegressionLearner trait and make some currect code implement it
> ----------------------------------------------------------------------
>
> Key: SPARK-3507
> URL: https://issues.apache.org/jira/browse/SPARK-3507
> Project: Spark
> Issue Type: New Feature
> Components: MLlib
> Affects Versions: 1.2.0
> Reporter: Egor Pakhomov
> Assignee: Egor Pakhomov
> Priority: Minor
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> Here in Yandex, during implementation of gradient boosting in spark and
> creating our ML tool for internal use, we found next serious problems in
> MLLib:
> There is no Regression/Classification learner model abstraction. We were
> building abstract data processing pipelines, which should work just with some
> regression - exact algorithm specified outside this code. There is no
> abstraction, which will allow me to do that. (It's main reason for all
> further problems)
> There is no common practice among MLlib for testing algorithms: every model
> generates it's own random test data. There is no easy extractable test cases
> applible to another algorithm. There is no benchmarks for comparing
> algorithms. After implementing new algorithm it's very hard to understand how
> it should be tested.
> Lack of serialization testing: MLlib algorithms don't contain tests which
> test that model work after serialization.
> During implementation of new algorithm it's hard to understand what API you
> should create and which interface to implement.
> Start for solving all these problems must be done in creating common
> interface for typical algorithms/models - regression, classification,
> clustering, collaborative filtering.
> All main tests should be written against these interfaces, so when new
> algorithm implemented - all it should do is passed already written tests. It
> allow us to have managble quality among all lib.
> There should be couple benchmarks which allow new spark user to get feeling
> about which algorithm to use.
> Test set against these abstractions should contain serialization test. In
> production most time there is no need in model, which can't be stored.
> As the first step of this roadmap I'd like to create trait RegressionLearner,
> ADD methods to current algorithms to implement this trait and create some
> tests against it.
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