Github user yinxusen commented on the pull request:
https://github.com/apache/spark/pull/5980#issuecomment-100116796
@mengxr How to represent `-inf` and `inf`? One possible solution is
```scala
val inf = Double.MaxValue
val negInf = Double.MinValue
splits = Array(negInf, 0, 1, 2, 3, inf)
```
Or we can define `inf` and `negInf` as double parameters, without setter.
```scala
val inf = new DoubleParam(this, "inf", "")
setDefault(inf -> Double.MaxValue)
def getInf = $(inf)
val negInf = new DoubleParam(this, "negInf", "")
setDefault(negInf -> Double.MinValue)
def getNegInf = $(negInf)
```
However, it would break the meaning of `splits`, I think.
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