Addressing PR issues

YanTangZhai · Dec 10, 2014 · f8d5928 · f8d5928
1 parent 277d367
commit f8d5928
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Showing 2 changed files with 15 additions and 14 deletions.
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/clustering/KMeans.scala b/mllib/src/main/scala/org/apache/spark/mllib/clustering/KMeans.scala
@@ -44,18 +44,13 @@ class KMeans private (
     private var initializationMode: String,
     private var initializationSteps: Int,
     private var epsilon: Double,
-    private var seed: Long = System.nanoTime()) extends Serializable with Logging {
+    private var seed: Long) extends Serializable with Logging {
 
   /**
    * Constructs a KMeans instance with default parameters: {k: 2, maxIterations: 20, runs: 1,
-   * initializationMode: "k-means||", initializationSteps: 5, epsilon: 1e-4}.
+   * initializationMode: "k-means||", initializationSteps: 5, epsilon: 1e-4, System.nanoTime()}.
    */
-  def this() = this(2, 20, 1, KMeans.K_MEANS_PARALLEL, 5, 1e-4)
-
-  def setSeed(seed: Long): this.type = {
-    this.seed = seed
-    this
-  }
+  def this() = this(2, 20, 1, KMeans.K_MEANS_PARALLEL, 5, 1e-4, System.nanoTime())
 
   /** Set the number of clusters to create (k). Default: 2. */
   def setK(k: Int): this.type = {
@@ -118,6 +113,12 @@ class KMeans private (
     this
   }
 
+  /** Set the random seed for cluster initialization. */
+  def setSeed(seed: Long): this.type = {
+    this.seed = seed
+    this
+  }
+
   /**
    * Train a K-means model on the given set of points; `data` should be cached for high
    * performance, because this is an iterative algorithm.
@@ -339,7 +340,7 @@ object KMeans {
   /**
    * Trains a k-means model using the given set of parameters.
    *
-   * @param data training points stored as `RDD[Array[Double]]`
+   * @param data training points stored as `RDD[Vector]`
    * @param k number of clusters
    * @param maxIterations max number of iterations
    * @param runs number of parallel runs, defaults to 1. The best model is returned.
@@ -361,12 +362,12 @@ object KMeans {
   /**
    * Trains a k-means model using the given set of parameters.
    *
-   * @param data training points stored as `RDD[Array[Double]]`
+   * @param data training points stored as `RDD[Vector]`
    * @param k number of clusters
    * @param maxIterations max number of iterations
    * @param runs number of parallel runs, defaults to 1. The best model is returned.
    * @param initializationMode initialization model, either "random" or "k-means||" (default).
-   * @param seed seed value for cluster initialization
+   * @param seed random seed value for cluster initialization
    */
   def train(
       data: RDD[Vector],

diff --git a/mllib/src/test/scala/org/apache/spark/mllib/clustering/KMeansSuite.scala b/mllib/src/test/scala/org/apache/spark/mllib/clustering/KMeansSuite.scala
@@ -90,9 +90,9 @@ class KMeansSuite extends FunSuite with MLlibTestSparkContext {
     assert(model.clusterCenters.size === 3)
   }
 
-  test("deterministic initilization") {
-    // Create a large-ish set of point to cluster
-    val points = List.tabulate(1000)(n => Vectors.dense(n,n))
+  test("deterministic initialization") {
+    // Create a large-ish set of points for clustering
+    val points = List.tabulate(1000)(n => Vectors.dense(n, n))
     val rdd = sc.parallelize(points, 3)
 
     for (initMode <- Seq(RANDOM, K_MEANS_PARALLEL)) {