[SPARK-6615][MLLIB] Python API for Word2Vec

This is the sub-task of SPARK-6254.
Wrap missing method for `Word2Vec` and `Word2VecModel`.

Author: lewuathe <lewuathe@me.com>

Closes #5296 from Lewuathe/SPARK-6615 and squashes the following commits:

f14c304 [lewuathe] Reorder tests
1d326b9 [lewuathe] Merge master
e2bedfb [lewuathe] Modify test cases
afb866d [lewuathe] [SPARK-6615] Python API for Word2Vec

1 files changed, 7 insertions, 1 deletions

diff --git a/mllib/src/main/scala/org/apache/spark/mllib/api/python/PythonMLLibAPI.scala b/mllib/src/main/scala/org/apache/spark/mllib/api/python/PythonMLLibAPI.scala
index 5995d6df97..6c386cacfb 100644
--- a/mllib/src/main/scala/org/apache/spark/mllib/api/python/PythonMLLibAPI.scala
+++ b/mllib/src/main/scala/org/apache/spark/mllib/api/python/PythonMLLibAPI.scala
@@ -476,13 +476,15 @@ private[python] class PythonMLLibAPI extends Serializable {
       learningRate: Double,
       numPartitions: Int,
       numIterations: Int,
-      seed: Long): Word2VecModelWrapper = {
+      seed: Long,
+      minCount: Int): Word2VecModelWrapper = {
     val word2vec = new Word2Vec()
       .setVectorSize(vectorSize)
       .setLearningRate(learningRate)
       .setNumPartitions(numPartitions)
       .setNumIterations(numIterations)
       .setSeed(seed)
+      .setMinCount(minCount)
     try {
       val model = word2vec.fit(dataJRDD.rdd.persist(StorageLevel.MEMORY_AND_DISK_SER))
       new Word2VecModelWrapper(model)
@@ -516,6 +518,10 @@ private[python] class PythonMLLibAPI extends Serializable {
       val words = result.map(_._1)
       List(words, similarity).map(_.asInstanceOf[Object]).asJava
     }
+
+    def getVectors: JMap[String, JList[Float]] = {
+      model.getVectors.map({case (k, v) => (k, v.toList.asJava)}).asJava
+    }
   }
 
   /**