Github user derrickburns commented on a diff in the pull request:
https://github.com/apache/spark/pull/2419#discussion_r17640135
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/clustering/package.scala ---
@@ -0,0 +1,140 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.mllib
+
+import org.apache.spark.mllib.linalg.Vector
+import breeze.linalg.{Vector => BV}
+import org.apache.spark.rdd.RDD
+
+package object base {
+
+ val Zero = 0.0
+ val One = 1.0
+ val Infinity = Double.MaxValue
+ val Unknown = -1.0
+
+ private[mllib] trait FP extends Serializable {
+ val weight: Double
+ val raw: BV[Double]
+ }
+
+ private[mllib] class FPoint(val raw: BV[Double], val weight: Double)
extends FP {
+ override def toString: String = weight + "," + (raw.toArray mkString
",")
+ lazy val inh = (raw :* (1.0 / weight)).toArray
+ }
+
+ /**
+ * A mutable point in homogeneous coordinates
+ */
+ private[mllib] class Centroid extends Serializable {
+ override def toString: String = weight + "," + (raw.toArray mkString
",")
--- End diff --
We initialize the Centroid lazily.
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