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from matplotlib import pyplot
import numpy as np

def scale(x, k=1.0, func="log"):
    k = max(1e-9, abs(k))
    if func == "log":
        return np.sign(x) * np.log(k*np.abs(x)+1) / k
    elif func == "sqrt":
        return np.sign(x) * (np.sqrt(k*np.abs(x)+1) * 2 - 2) / k
    else:

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Expectation 표기법

        

Expectation의 선형성

        

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object PoiMapping {

  type Poi = Int
  type Grade = Int
  case class MatchResult(poi: Poi, grade: Grade)

  private def searchMatchingCandidates(poi: Poi): Seq[Poi] = 1 to 300 by 3

  private def evaluateMatching(p: Poi, c: Poi): Grade = (p - c).abs