def source
import bendtorch-core@0.1.0.0/src/tensor/gather.bend as Gatherimport Base
246def source(+plan: Plan, +at: Nat, +j: Nat) -> Nat:
247 Plan{+kind, +outer, +extent, +inner, +length} = plan
248 position(extent, inner, Nat.div(Nat.div(at, inner), length), j, Nat.mod(at, inner))