Shintaro Murakami created SPARK-22795:
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             Summary: Raise error when line search in FirstOrderMinimizer failed
                 Key: SPARK-22795
                 URL: https://issues.apache.org/jira/browse/SPARK-22795
             Project: Spark
          Issue Type: Improvement
          Components: ML
    Affects Versions: 2.2.1
            Reporter: Shintaro Murakami
            Priority: Minor


When line search in FirstOrderMinimizer (LBFGS or OWLQN so on) failed, the fit 
method of estimator not failed, and a meaning-less transformer is returned. 
The error should be discovered early.



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