TensorBackwardLAWS.targets: def of bendtorch-core@0.1.0.0
Import: import bendtorch-core@0.1.0.0/src/autograd/tensor_backward_LAWS.bend as TensorBackwardLAWS
Lines 37-73 of bendtorch-core@0.1.0.0/src/autograd/tensor_backward_LAWS.bend: https://jend.leeeet.dev/read.txt?path=bendtorch-core@0.1.0.0/src/autograd/tensor_backward_LAWS.bend&start_line=37&end_line=73

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

# Operand bounds, stated without the engine's validator: a node may name only
# nodes older than itself, so each operand id must be below the number of
# older nodes.
def targets(node: Backward.Node) -> List<&2, Nat>:
  match node:
    case Backward.Leaf{}:
      []
    case Backward.Add{a, b, left, right}:
      [a, b]
    case Backward.Sub{a, b, left, right}:
      [a, b]
    case Backward.Mul{a, b, left, right}:
      [a, b]
    case Backward.Sum{a, input}:
      [a]
    case Backward.SumDims{a, input, kept}:
      [a]
    case Backward.Matmul{a, b, left, right}:
      [a, b]
    case Backward.MatmulNT{a, b, left, right}:
      [a, b]
    case Backward.Relu{a, input}:
      [a]
    case Backward.MseLoss{a, b, left, right}:
      [a, b]
    case Backward.CrossEntropy{a, input}:
      [a]
    case Backward.BatchedMatmul{a, b, left, right}:
      [a, b]
    case Backward.Slice{a, input, kept, plan}:
      [a]
    case Backward.Gathered{a, input, plan, entries}:
      [a]
    case Backward.Constant{}:
      []
    case Backward.Frozen{id, inner}:
      targets(inner)

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=bendtorch-core@0.1.0.0/src/autograd/tensor_backward.bend&name=Node