Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/9229#discussion_r56207829
--- Diff: mllib/src/main/scala/org/apache/spark/ml/ann/Layer.scala ---
@@ -32,20 +32,43 @@ import org.apache.spark.util.random.XORShiftRandom
*
*/
private[ann] trait Layer extends Serializable {
+
+ /**
+ * Number of weights that is used to allocate memory for the weights
vector
+ */
+ val weightSize: Int
+
+ /**
+ * Returns the output size given the input size (not counting the stack
size).
+ * Output size is used to allocate memory for the output.
+ * @param inputSize input size
+ * @return output size
+ */
+ def outputSize(inputSize: Int): Int
--- End diff --
`getOutputSize`
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