Github user VinceShieh commented on a diff in the pull request:
https://github.com/apache/spark/pull/14858#discussion_r77138983
--- Diff: docs/ml-features.md ---
@@ -1102,7 +1102,8 @@ for more details on the API.
## QuantileDiscretizer
`QuantileDiscretizer` takes a column with continuous features and outputs
a column with binned
-categorical features. The number of bins is set by the `numBuckets`
parameter.
+categorical features. The number of bins is set by the `numBuckets`
parameter, but it is
--- End diff --
consider situation, when a high proportion of duplicated data and/or NaN
exist in a data sample, the exact number of buckets is hard to get, it could be
less than/equal to/ more than 'numBuckets'. what we can be sure is that, the
NaN value if existed will be grouped in the last bucket.
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