Github user feynmanliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/7705#discussion_r35818506
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAModel.scala ---
@@ -53,6 +51,37 @@ abstract class LDAModel private[clustering] extends
Saveable {
/** Vocabulary size (number of terms or terms in the vocabulary) */
def vocabSize: Int
+ /** Dirichlet parameters for document-topic distribution. */
+ protected def docConcentration: Vector
+
+ /**
+ * Concentration parameter (commonly named "alpha") for the prior placed
on documents'
+ * distributions over topics ("theta").
+ *
+ * This is the parameter to a Dirichlet distribution.
+ */
+ def getDocConcentration: Vector = this.docConcentration
--- End diff --
OK
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