Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/7538#issuecomment-127430728
@MechCoder Thanks for the updates! We'll need to use traits to fix the
multiple inheritance issue:
```
sealed trait LogisticRegressionSummary
sealed trait LogisticRegressionTrainingSummary
class BinaryLogisticRegressionSummary extends LogisticRegressionSummary
class BinaryLogisticRegressionTrainingSummary extends
BinaryLogisticRegressionSummary with LogisticRegressionTrainingSummary
```
Notes:
* LogisticRegressionSummary could be an abstract class if it saves a lot of
code, but if not, I'd prefer it remain a trait.
* I'm marking the traits sealed so that we can extend them in the future
without breaking the public API.
* These classes and traits will need to be public.
Let me know if you have alternate ideas for these items.
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