Github user MLnick commented on a diff in the pull request:
https://github.com/apache/spark/pull/19715#discussion_r153775451
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/QuantileDiscretizer.scala ---
@@ -50,10 +50,26 @@ private[feature] trait QuantileDiscretizerBase extends
Params
/** @group getParam */
def getNumBuckets: Int = getOrDefault(numBuckets)
+ /**
+ * Array of number of buckets (quantiles, or categories) into which data
points are grouped.
--- End diff --
Can add a comment about "each value must be greater than or equal to 2"
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