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[FLINK-2131][ml]: Initialization schemes for k-means clustering #757

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[FLINK-2131][ml]: Initialization schemes for k-means clustering #757

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708a424
[FLINK-1731][ml]Added KMeans algorithm to ML library
peterschrott Jul 29, 2015
38c31ab
[FLINK-1731][ml]Added unit tests for KMeans algorithm
FGoessler Jul 29, 2015
81c7106
[FLINK-2131] Added initialization schemes for KMeans clustering
sachingoel0101 Jul 29, 2015
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29 changes: 28 additions & 1 deletion flink-libraries/flink-ml/src/main/scala/org/apache/flink/ml/package.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -18,13 +18,15 @@

package org.apache.flink


import org.apache.flink.api.common.functions.{RichFilterFunction, RichMapFunction}
import org.apache.flink.api.common.typeinfo.TypeInformation
import org.apache.flink.api.java.operators.DataSink
import org.apache.flink.api.scala.{DataSet, ExecutionEnvironment}
import org.apache.flink.configuration.Configuration
import org.apache.flink.ml.common.LabeledVector

import scala.collection.JavaConverters._
import scala.reflect.ClassTag

package object ml {
Expand Down Expand Up @@ -70,6 +72,14 @@ package object ml {
dataSet.map(new BroadcastSingleElementMapperWithIteration[T, B, O](dataSet.clean(fun)))
.withBroadcastSet(broadcastVariable, "broadcastVariable")
}

def mapWithBcSet[B, O: TypeInformation: ClassTag](
broadcastVariable: DataSet[B])(
fun: (T, Seq[B]) => O)
: DataSet[O] = {
dataSet.map(new BroadcastSetMapper[T, B, O](dataSet.clean(fun)))
.withBroadcastSet(broadcastVariable, "broadcastVariable")
}
}

private class BroadcastSingleElementMapper[T, B, O](
Expand Down Expand Up @@ -101,7 +111,7 @@ package object ml {
fun(value, broadcastVariable, getIterationRuntimeContext.getSuperstepNumber)
}
}

private class BroadcastSingleElementFilter[T, B](
fun: (T, B) => Boolean)
extends RichFilterFunction[T] {
Expand All @@ -116,4 +126,21 @@ package object ml {
fun(value, broadcastVariable)
}
}

private class BroadcastSetMapper[T, B, O](fun: (T, Seq[B]) => O)
extends RichMapFunction[T, O] {
var broadcastVariable: Seq[B] = _

@throws(classOf[Exception])
override def open(configuration: Configuration): Unit = {
broadcastVariable = getRuntimeContext
.getBroadcastVariable[B]("broadcastVariable")
.asScala
.toSeq
}

override def map(value: T): O = {
fun(value, broadcastVariable)
}
}
}
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