MlbendSelect.select_covers: law of mlbend-select@0.1.0.0
Import: import mlbend-select@0.1.0.0/main.bend as MlbendSelect
Lines 25-33 of mlbend-select@0.1.0.0/main.bend: https://jend.leeeet.dev/read.txt?path=mlbend-select@0.1.0.0/main.bend&start_line=25&end_line=33

import Base
import mlbend-split@0.1.1.0/main.bend as Split

# LAW (select_covers): every row of the dataset is in exactly one fold —
# the fold list holds one entry per row, so the folds cover the dataset
# exactly once each.
law select_covers:
  for labels: List<&2, Nat>
  for +orders: List<&2, List<&2, Nat>>
  for +k: Nat
  for +i: Nat
  {Split.count_rows(Split.folds_from(labels, orders, k, i)) == List.length(&2, Nat, labels) : Nat}

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.length
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.add
  https://jend.leeeet.dev/definition.txt?path=mlbend-split@0.1.1.0/main.bend&name=count_rows
  https://jend.leeeet.dev/definition.txt?path=mlbend-split@0.1.1.0/main.bend&name=folds_from