Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/16883#discussion_r103332764
--- Diff: docs/ml-features.md ---
@@ -502,7 +502,7 @@ for more details on the API.
## StringIndexer
`StringIndexer` encodes a string column of labels to a column of label
indices.
-The indices are in `[0, numLabels)`, ordered by label frequencies, so the
most frequent label gets index `0`.
+The indices are in `[0, numLabels]`, ordered by label frequencies, so the
most frequent label gets index `0`.
--- End diff --
This change is not correct, except when keeping invalid ones.
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