Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/4580#discussion_r29816042
--- Diff: docs/mllib-feature-extraction.md ---
@@ -477,3 +477,76 @@ sc.stop();
</div>
</div>
+## ElementwiseProduct
+
+ElementwiseProduct multiplies individual vector samples by a provided
weighting vector component-wise. This represents the [Hadamard
product](https://en.wikipedia.org/wiki/Hadamard_product_%28matrices%29) between
the input vector, `v` and transforming vector, `w`, to yield a result vector.
+
+`\[ \begin{pmatrix}
+v_1 \\
+\vdots \\
+v_N
+\end{pmatrix} \circ \begin{pmatrix}
+ w_1 \\
+ \vdots \\
+ w_N
+ \end{pmatrix}
+= \begin{pmatrix}
+ v_1 w_1 \\
+ \vdots \\
+ v_N w_N
+ \end{pmatrix}
+\]`
+
+[`ElementwiseProduct`](api/scala/index.html#org.apache.spark.mllib.feature.ElementwiseProduct)
has the following parameter in the constructor:
+
+* `w` Vector, the transforming vector.
--- End diff --
``` `w` Vector, the transforming vector``` --> ``` `w`: the transforming
vector``` (add colon + remove superfluous "Vector")
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