Sgd.refusal_at: def of bendtorch-core@0.1.0.0
Import: import bendtorch-core@0.1.0.0/src/autograd/sgd.bend as Sgd
Lines 67-78 of bendtorch-core@0.1.0.0/src/autograd/sgd.bend: https://jend.leeeet.dev/read.txt?path=bendtorch-core@0.1.0.0/src/autograd/sgd.bend&start_line=67&end_line=78

import Base
import bendtorch-core@0.1.0.0/src/autograd/tensor_backward.bend as Backward

# Why id cannot be a parameter of a newest-first list of count nodes, or
# None when it is a leaf the list holds.
def refusal_at(nodes: List<&2, Backward.Node>, +count: Nat, +id: Nat, same: Bool) -> Maybe<&2, Error>:
  match nodes count same:
    case Nil{} count same:
      Some{UnknownNode{}}
    case Con{node, rest} 0n same:
      Some{UnknownNode{}}
    case Con{node, rest} 1n+below True{}:
      leaf_refusal(node)
    case Con{node, rest} 1n+below False{}:
      refusal_at(rest, below, id, Backward.at_head(below, id))

Uses (8):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/autograd/sgd.bend&name=Error
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/autograd/sgd.bend&name=leaf_refusal
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/autograd/tensor_backward.bend&name=Node
  https://jend.leeeet.dev/definition.txt?path=bendtorch-core@0.1.0.0/src/autograd/tensor_backward.bend&name=at_head