Sbx.beta.pick: def of unified-nsga-iii@0.2.2.0
Import: import unified-nsga-iii@0.2.2.0/sbx.bend as Sbx
Lines 46-52 of unified-nsga-iii@0.2.2.0/sbx.bend: https://jend.leeeet.dev/read.txt?path=unified-nsga-iii@0.2.2.0/sbx.bend&start_line=46&end_line=52

import Base

# C#: if rand <= 1/alpha then (rand*alpha)^(1/(η+1)) else (1/(2-rand*alpha))^(1/(η+1)).
def beta.pick(+rand: F32, +alpha: F32, +inv: F32, lo: Bool) -> F32:
  match lo:
    case True{}:
      F32.pow(F32.mul(rand, alpha), inv)
    case False{}:
      F32.pow(F32.div(1.0, F32.sub(2.0, F32.mul(rand, alpha))), inv)

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32.div
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32.mul
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32.pow
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32.sub