Tensor.inner: def of bendtorch@1.3.0.0
Import: import bendtorch@1.3.0.0/tensor.bend as Tensor
Lines 264-272 of bendtorch@1.3.0.0/tensor.bend: https://jend.leeeet.dev/read.txt?path=bendtorch@1.3.0.0/tensor.bend&start_line=264&end_line=272

import Base
import bend-ml-nat-lemmas@0.1.2.0/main.bend as NL

# the product of the sizes after axis k
def inner(s: List<&2, Nat>, k: Nat) -> Nat:
  match s k:
    case Nil{} _:
      1n
    case Con{h, t} 0n:
      NL.product(t)
    case Con{h, t} 1n+p:
      inner(t, p)

Uses (3):
  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=bend-ml-nat-lemmas@0.1.2.0/main.bend&name=product