Github user Earthson commented on the pull request:
https://github.com/apache/spark/pull/9650#issuecomment-156036519
I have an idea that may simplify the using DefaultParamsReader/Writer
```scala
/**
* Default Writable using DefaultParamsWriter
*/
@Experimental
@Since("1.6.0")
trait DefaultWritable extends Writable {
self: Params =>
override def write: Writer = new DefaultParamsWriter(self)
}
/**
* Default Readable using DefaultParamsReader
* @tparam T ML instance type
*/
@Experimental
@Since("1.6.0")
trait DefaultReadable[T] extends Readable[T] {
override def read: Reader[T] = new DefaultParamsReader[T]
}
```
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