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com.spotify.featran.transformers

VonMisesEvaluator

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object VonMisesEvaluator extends Serializable

Transform a column of continuous features that represent the mean of a von Mises distribution to n columns of continuous features. The number n represent the number of points to evaluate the von Mises distribution. The von Mises pdf is given by

f(x | mu, kappa, scale) = exp(kappa * cos(scale*(x-mu)) / (2*pi*Io(kappa))

and is only valid for x, mu in the interval [0, 2*pi/scale].

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  4. def apply(name: String, kappa: Double, scale: Double, points: Array[Double]): Transformer[Double, Unit, Unit]

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    Create a new VonMisesEvaluator instance.

    Create a new VonMisesEvaluator instance.

    kappa

    measure of concentration

    scale

    scaling factor

    points

    points to evaluate the distribution with

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  11. def getProbability(x: Double, mu: Double, kappa: Double, scale: Double): Double

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