trait Scaling extends AnyRef

Scaling utilities.

Often, in order to avoid underflow, we can offload some of the exponent of a double into an int. To make things more efficient, we can actually share that exponent between doubles.

The scales used in this trait are in log space: they can be safely added and subtracted.

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Scaling
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  1. abstract val scaleConstant: Int

    the largest (log) power of two we want to deal with

Concrete Value Members

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  2. final def ##(): Int
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  6. def computeScaleDelta(scores: Array[Double]): Int

    Computes the log power of two we'd need to scale by so that the max double is between (2 ** scaleConstant, 2 ** -scaleConstant).

  7. def determineScale(score: Double, oldScale: Int): Int
  8. final def eq(arg0: AnyRef): Boolean
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  10. def finalize(): Unit
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  11. final def getClass(): Class[_]
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  15. final def notify(): Unit
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  16. final def notifyAll(): Unit
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  17. def scaleArray(scores: Array[Double], currentScale: Int): Int

    Ensures that the max double is between (2**scaleConstant,2**-scaleConstant), scaling the array as necessary.

    Ensures that the max double is between (2**scaleConstant,2**-scaleConstant), scaling the array as necessary.

    returns

    newScale

  18. def scaleArrayToScale(scores: Array[Double], currentScale: Int, targetScale: Int): Unit
  19. def scaleValue(score: Double, currentScale: Int, targetScale: Int): Double

    Converts the scaled value into "normal" space

  20. def sumArrays(src: Array[Double], srcScale: Int, dest: Array[Double], destScale: Int): Int

    Sums src into dest assuming they're at different scales.

    Sums src into dest assuming they're at different scales. src may be longer than dest, which is useful for allocating a large work buffer.

    returns

    the new scale

  21. final def synchronized[T0](arg0: ⇒ T0): T0
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  22. def toLogSpace(score: Double, currentScale: Int): Double
  23. def toString(): String
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  24. def unscaleValue(score: Double, currentScale: Int): Double

    Converts the scaled value into "normal" space

  25. final def wait(): Unit
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  26. final def wait(arg0: Long, arg1: Int): Unit
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  27. final def wait(arg0: Long): Unit
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