[GitHub] [spark] huaxingao commented on issue #26344: [SPARK-29686][ML] LinearSVC should persist instances if needed

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huaxingao commented on issue #26344: [SPARK-29686][ML] LinearSVC should persist instances if needed
URL: https://github.com/apache/spark/pull/26344#issuecomment-548510267
 
 
   One general question: what is the criteria to add the persistence support? I took a quick look of the ml code, seems some of them have the persistence support, some of them don't. For example, in classification, ```LogisticRegression```, ```OneVsRest``` and this ```LinearSVC``` have persistence support, but others don't. I didn't quite figure out when we need to persist the data. 

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