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[SPARK-19384][ML] forget unpersist input dataset in IsotonicRegression
## What changes were proposed in this pull request? unpersist the input dataset if `handlePersistence` = true ## How was this patch tested? existing tests Author: Zheng RuiFeng <ruifengz@foxmail.com> Closes #16718 from zhengruifeng/isoReg_unpersisit.
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