Github user MLnick commented on a diff in the pull request:
https://github.com/apache/spark/pull/13176#discussion_r65634025
--- Diff:
examples/src/main/scala/org/apache/spark/examples/ml/QuantileDiscretizerExample.scala
---
@@ -38,6 +38,7 @@ object QuantileDiscretizerExample {
.setInputCol("hour")
.setOutputCol("result")
.setNumBuckets(3)
+ .setRelativeError(0)
--- End diff --
If we do this here, then I think we should be explicit about the fact that
we're computing exact quantiles for illustrative purposes.
Something like
```
.setRelativeError(0) // note that we compute exact quantiles here for
illustrative purposes, however in most cases the default parameter value should
suffice
```
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