Github user hayashidac commented on a diff in the pull request:
https://github.com/apache/spark/pull/15658#discussion_r86677670
--- Diff: docs/ml-features.md ---
@@ -729,6 +729,58 @@ for more details on the API.
</div>
</div>
+## Interaction
+
+`Interaction` is a `Transformer` which takes a vector/double columns, and
generate a single vector column that contains multiplication results of all
combination of each vector/double values.
+
+For example, if you have two vector type columns each of which contains
three double type values as input columns, then you'll get a vector with 9
double type values as the output column.
--- End diff --
Thank you for your check. I fixed the document for your comment.
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