PolynomialMutation.start: def of unified-nsga-iii@0.2.2.0
Import: import unified-nsga-iii@0.2.2.0/polynomial_mutation.bend as PolynomialMutation
Lines 139-161 of unified-nsga-iii@0.2.2.0/polynomial_mutation.bend: https://jend.leeeet.dev/read.txt?path=unified-nsga-iii@0.2.2.0/polynomial_mutation.bend&start_line=139&end_line=161

import Base
import unified-nsga-iii@0.2.2.0/individual.bend as Ind
import unified-nsga-iii@0.2.2.0/bounds.bend as Bounds
import unified-nsga-iii@0.2.2.0/rng.bend as Rng

def start(
  +eta: F32,
  +box: Bounds.Box,
  rng: Rng.State,
  +ind: Ind.Individual,
  +p: F32,
  n: Nat
) -> Rng.State & Ind.Individual:
  match n:
    case 0n:
      (rng, ind)
    case 1n+f:
      +rng2 = Rng.next_double(rng)
      +xs = Ind.variables(ind)
      +ivs = Bounds.intervals_of(box)
      finish(
        Ind.n_obj(ind),
        loop.go(
          1n+f,
          skip_kind(F32.is_gt(Rng.last_double(rng2), p), tiny_head(ivs)),
          xs, ivs, eta, rng2, Nil{}, p
        )
      )

Uses (18):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=F32.is_gt
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/bounds.bend&name=Box
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/bounds.bend&name=intervals_of
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/individual.bend&name=Individual
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/individual.bend&name=n_obj
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/individual.bend&name=variables
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/polynomial_mutation.bend&name=finish
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/polynomial_mutation.bend&name=loop.go
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/polynomial_mutation.bend&name=skip_kind
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/polynomial_mutation.bend&name=tiny_head
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/rng.bend&name=State
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/rng.bend&name=last_double
  https://jend.leeeet.dev/definition.txt?path=unified-nsga-iii@0.2.2.0/rng.bend&name=next_double