Reduce.first_digit: def of bendtorch-core@0.1.0.0
Import: import bendtorch-core@0.1.0.0/src/autograd/reduce.bend as Reduce
Lines 51-58 of bendtorch-core@0.1.0.0/src/autograd/reduce.bend: https://jend.leeeet.dev/read.txt?path=bendtorch-core@0.1.0.0/src/autograd/reduce.bend&start_line=51&end_line=58

import Base
import bendtorch-core@0.1.0.0/src/shape/core.bend as Shape

# The first digit a row walks: 0 on a reduced axis (`Nat.div` by 0 is 0),
# else the digit `target` names there.
def first_digit(+rows: List<&2, Shape.Row>, +target: Nat) -> Nat:
  match rows:
    case Nil{}:
      0n
    case Shape.Row{stride, +left, right} <> rest:
      Nat.div(target, left)

Uses (4):
  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=Nat.div
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/shape/core.bend&name=Row