[SPARK-7604] [MLLIB] Python API for PCA and PCAModel

Python API for PCA and PCAModel

Author: Yanbo Liang <ybliang8@gmail.com>

Closes #6315 from yanboliang/spark-7604 and squashes the following commits:

1d58734 [Yanbo Liang] remove transform() in PCAModel, use default behavior
4d9d121 [Yanbo Liang] Python API for PCA and PCAModel

1 files changed, 10 insertions, 0 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 2897865af6..634d56d08d 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
@@ -520,6 +520,16 @@ private[python] class PythonMLLibAPI extends Serializable {
   }
 
   /**
+   * Java stub for PCA.fit(). This stub returns a
+   * handle to the Java object instead of the content of the Java object.
+   * Extra care needs to be taken in the Python code to ensure it gets freed on
+   * exit; see the Py4J documentation.
+   */
+  def fitPCA(k: Int, data: JavaRDD[Vector]): PCAModel = {
+    new PCA(k).fit(data.rdd)
+  }
+
+  /**
    * Java stub for IDF.fit(). This stub returns a
    * handle to the Java object instead of the content of the Java object.
    * Extra care needs to be taken in the Python code to ensure it gets freed on