Class

org.apache.spark.mllib.evaluation

BinaryClassificationMetrics

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class BinaryClassificationMetrics extends Logging

Evaluator for binary classification.

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@Since( "1.0.0" )
Source
BinaryClassificationMetrics.scala
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Instance Constructors

  1. new BinaryClassificationMetrics(scoreAndLabels: RDD[(Double, Double)])

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    Defaults numBins to 0.

    Defaults numBins to 0.

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    @Since( "1.0.0" )
  2. new BinaryClassificationMetrics(scoreAndLabels: RDD[(Double, Double)], numBins: Int)

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    scoreAndLabels

    an RDD of (score, label) pairs.

    numBins

    if greater than 0, then the curves (ROC curve, PR curve) computed internally will be down-sampled to this many "bins". If 0, no down-sampling will occur. This is useful because the curve contains a point for each distinct score in the input, and this could be as large as the input itself -- millions of points or more, when thousands may be entirely sufficient to summarize the curve. After down-sampling, the curves will instead be made of approximately numBins points instead. Points are made from bins of equal numbers of consecutive points. The size of each bin is floor(scoreAndLabels.count() / numBins), which means the resulting number of bins may not exactly equal numBins. The last bin in each partition may be smaller as a result, meaning there may be an extra sample at partition boundaries.

    Annotations
    @Since( "1.3.0" )

Value Members

  1. final def !=(arg0: Any): Boolean

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  2. final def ##(): Int

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  3. final def ==(arg0: Any): Boolean

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  4. def areaUnderPR(): Double

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    Computes the area under the precision-recall curve.

    Computes the area under the precision-recall curve.

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    @Since( "1.0.0" )
  5. def areaUnderROC(): Double

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    Computes the area under the receiver operating characteristic (ROC) curve.

    Computes the area under the receiver operating characteristic (ROC) curve.

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    @Since( "1.0.0" )
  6. final def asInstanceOf[T0]: T0

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  7. def clone(): AnyRef

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  8. final def eq(arg0: AnyRef): Boolean

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  9. def equals(arg0: Any): Boolean

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  10. def fMeasureByThreshold(): RDD[(Double, Double)]

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    Returns the (threshold, F-Measure) curve with beta = 1.0.

    Returns the (threshold, F-Measure) curve with beta = 1.0.

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    @Since( "1.0.0" )
  11. def fMeasureByThreshold(beta: Double): RDD[(Double, Double)]

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    Returns the (threshold, F-Measure) curve.

    Returns the (threshold, F-Measure) curve.

    beta

    the beta factor in F-Measure computation.

    returns

    an RDD of (threshold, F-Measure) pairs.

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    @Since( "1.0.0" )
    See also

    F1 score (Wikipedia)

  12. def finalize(): Unit

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  13. final def getClass(): Class[_]

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  14. def hashCode(): Int

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  15. def initializeLogIfNecessary(isInterpreter: Boolean, silent: Boolean = false): Boolean

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  16. def initializeLogIfNecessary(isInterpreter: Boolean): Unit

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  17. final def isInstanceOf[T0]: Boolean

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  18. def isTraceEnabled(): Boolean

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  19. def log: Logger

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

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  21. def logDebug(msg: ⇒ String): Unit

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  22. def logError(msg: ⇒ String, throwable: Throwable): Unit

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  23. def logError(msg: ⇒ String): Unit

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  24. def logInfo(msg: ⇒ String, throwable: Throwable): Unit

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  25. def logInfo(msg: ⇒ String): Unit

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  26. def logName: String

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  27. def logTrace(msg: ⇒ String, throwable: Throwable): Unit

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  28. def logTrace(msg: ⇒ String): Unit

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  29. def logWarning(msg: ⇒ String, throwable: Throwable): Unit

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  30. def logWarning(msg: ⇒ String): Unit

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  31. final def ne(arg0: AnyRef): Boolean

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  32. final def notify(): Unit

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  33. final def notifyAll(): Unit

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  34. val numBins: Int

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    if greater than 0, then the curves (ROC curve, PR curve) computed internally will be down-sampled to this many "bins".

    if greater than 0, then the curves (ROC curve, PR curve) computed internally will be down-sampled to this many "bins". If 0, no down-sampling will occur. This is useful because the curve contains a point for each distinct score in the input, and this could be as large as the input itself -- millions of points or more, when thousands may be entirely sufficient to summarize the curve. After down-sampling, the curves will instead be made of approximately numBins points instead. Points are made from bins of equal numbers of consecutive points. The size of each bin is floor(scoreAndLabels.count() / numBins), which means the resulting number of bins may not exactly equal numBins. The last bin in each partition may be smaller as a result, meaning there may be an extra sample at partition boundaries.

    Annotations
    @Since( "1.3.0" )
  35. def pr(): RDD[(Double, Double)]

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    Returns the precision-recall curve, which is an RDD of (recall, precision), NOT (precision, recall), with (0.0, p) prepended to it, where p is the precision associated with the lowest recall on the curve.

    Returns the precision-recall curve, which is an RDD of (recall, precision), NOT (precision, recall), with (0.0, p) prepended to it, where p is the precision associated with the lowest recall on the curve.

    Annotations
    @Since( "1.0.0" )
    See also

    Precision and recall (Wikipedia)

  36. def precisionByThreshold(): RDD[(Double, Double)]

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    Returns the (threshold, precision) curve.

    Returns the (threshold, precision) curve.

    Annotations
    @Since( "1.0.0" )
  37. def recallByThreshold(): RDD[(Double, Double)]

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    Returns the (threshold, recall) curve.

    Returns the (threshold, recall) curve.

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    @Since( "1.0.0" )
  38. def roc(): RDD[(Double, Double)]

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    Returns the receiver operating characteristic (ROC) curve, which is an RDD of (false positive rate, true positive rate) with (0.0, 0.0) prepended and (1.0, 1.0) appended to it.

    Returns the receiver operating characteristic (ROC) curve, which is an RDD of (false positive rate, true positive rate) with (0.0, 0.0) prepended and (1.0, 1.0) appended to it.

    Annotations
    @Since( "1.0.0" )
    See also

    Receiver operating characteristic (Wikipedia)

  39. val scoreAndLabels: RDD[(Double, Double)]

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    an RDD of (score, label) pairs.

    an RDD of (score, label) pairs.

    Annotations
    @Since( "1.3.0" )
  40. final def synchronized[T0](arg0: ⇒ T0): T0

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  41. def thresholds(): RDD[Double]

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    Returns thresholds in descending order.

    Returns thresholds in descending order.

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    @Since( "1.0.0" )
  42. def toString(): String

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  43. def unpersist(): Unit

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    Unpersist intermediate RDDs used in the computation.

    Unpersist intermediate RDDs used in the computation.

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    @Since( "1.0.0" )
  44. final def wait(): Unit

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  45. final def wait(arg0: Long, arg1: Int): Unit

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  46. final def wait(arg0: Long): Unit

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