Github user WeichenXu123 commented on the issue:
https://github.com/apache/spark/pull/15435
@sethah
About your new design,
```
Summary
PredictionSummary extends Summary
ClassificationSummary extends PredictionSummary
ProbabilisticClassificationSummary extends ClassificationSummary
MulticlassClassificationSummary extends ClassificationSummary
BinaryClassificationSummary extends MulticlassClassificationSummary
Then we could implement model summaries like:
LogisticRegressionTrainingSummary extends MulticlassClassificationSummary with
ProbabilisticClassificationSummary with TrainingSummary
```
suppose the `def summary` return `LogisticRegressionTrainingSummary` type,
how to deal with `BinaryClassificationSummary` ?
In this hierarchy, `BinaryClassificationSummary` cannot inherit from
`LogisticRegressionTrainingSummary`,
but `def summary` method must support `Binary` case...
so it meets the similar problem I mentioned above...
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