[SPARK-7070] [MLLIB] LDA.setBeta should call setTopicConcentration.

jkbradley

Author: Xiangrui Meng <[email protected]>

Closes #5649 from mengxr/SPARK-7070 and squashes the following commits:

c66023c [Xiangrui Meng] setBeta should call setTopicConcentration

(cherry picked from commit 1ed46a6)
Signed-off-by: Xiangrui Meng <[email protected]>

Author: mengxr

mllib/src/main/scala/org/apache/spark/mllib/clustering/LDA.scala

@@ -177,7 +177,7 @@ class LDA private (
   def getBeta: Double = getTopicConcentration
 
   /** Alias for [[setTopicConcentration()]] */
-  def setBeta(beta: Double): this.type = setBeta(beta)
+  def setBeta(beta: Double): this.type = setTopicConcentration(beta)
 
   /**
    * Maximum number of iterations for learning.

mllib/src/test/scala/org/apache/spark/mllib/clustering/LDASuite.scala

@@ -123,6 +123,14 @@ class LDASuite extends FunSuite with MLlibTestSparkContext {
     assert(termVertexIds.map(i => LDA.index2term(i.toLong)) === termIds)
     assert(termVertexIds.forall(i => LDA.isTermVertex((i.toLong, 0))))
   }
+
+  test("setter alias") {
+    val lda = new LDA().setAlpha(2.0).setBeta(3.0)
+    assert(lda.getAlpha === 2.0)
+    assert(lda.getDocConcentration === 2.0)
+    assert(lda.getBeta === 3.0)
+    assert(lda.getTopicConcentration === 3.0)
+  }
 }
 
 private[clustering] object LDASuite {