Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/16883#discussion_r104296526
--- Diff: docs/ml-features.md ---
@@ -542,12 +543,13 @@ column, we should get the following:
"a" gets index `0` because it is the most frequent, followed by "c" with
index `1` and "b" with
index `2`.
-Additionally, there are two strategies regarding how `StringIndexer` will
handle
+Additionally, there are three strategies regarding how `StringIndexer`
will handle
unseen labels when you have fit a `StringIndexer` on one dataset and then
use it
to transform another:
- throw an exception (which is the default)
- skip the row containing the unseen label entirely
+- map the unseen labels with indices [numLabels]
--- End diff --
Or just match the phrasing in the doc param
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