org.apache.spark.mllib.clustering

KMeans

class KMeans extends Serializable with Logging

K-means clustering with support for multiple parallel runs and a k-means++ like initialization mode (the k-means|| algorithm by Bahmani et al). When multiple concurrent runs are requested, they are executed together with joint passes over the data for efficiency.

This is an iterative algorithm that will make multiple passes over the data, so any RDDs given to it should be cached by the user.

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Instance Constructors

  1. new KMeans()

    Constructs a KMeans instance with default parameters: {k: 2, maxIterations: 20, runs: 1, initializationMode: "k-means||", initializationSteps: 5, epsilon: 1e-4, seed: random}.

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  15. def log: Logger

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  16. def logDebug(msg: ⇒ String, throwable: Throwable): Unit

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  30. def run(data: RDD[Vector]): KMeansModel

    Train a K-means model on the given set of points; data should be cached for high performance, because this is an iterative algorithm.

  31. def setEpsilon(epsilon: Double): KMeans.this.type

    Set the distance threshold within which we've consider centers to have converged.

    Set the distance threshold within which we've consider centers to have converged. If all centers move less than this Euclidean distance, we stop iterating one run.

  32. def setInitializationMode(initializationMode: String): KMeans.this.type

    Set the initialization algorithm.

    Set the initialization algorithm. This can be either "random" to choose random points as initial cluster centers, or "k-means||" to use a parallel variant of k-means++ (Bahmani et al., Scalable K-Means++, VLDB 2012). Default: k-means||.

  33. def setInitializationSteps(initializationSteps: Int): KMeans.this.type

    Set the number of steps for the k-means|| initialization mode.

    Set the number of steps for the k-means|| initialization mode. This is an advanced setting -- the default of 5 is almost always enough. Default: 5.

  34. def setK(k: Int): KMeans.this.type

    Set the number of clusters to create (k).

    Set the number of clusters to create (k). Default: 2.

  35. def setMaxIterations(maxIterations: Int): KMeans.this.type

    Set maximum number of iterations to run.

    Set maximum number of iterations to run. Default: 20.

  36. def setRuns(runs: Int): KMeans.this.type

    :: Experimental :: Set the number of runs of the algorithm to execute in parallel.

    :: Experimental :: Set the number of runs of the algorithm to execute in parallel. We initialize the algorithm this many times with random starting conditions (configured by the initialization mode), then return the best clustering found over any run. Default: 1.

    Annotations
    @Experimental()
  37. def setSeed(seed: Long): KMeans.this.type

    Set the random seed for cluster initialization.

  38. final def synchronized[T0](arg0: ⇒ T0): T0

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