def left_product

bendtorch-core@0.1.0.0 · src/autograd/tensor_backward.bend:323

import Base
import bendtorch-core@0.1.0.0/src/shape/core.bend as Shape
import bendtorch-core@0.1.0.0/src/tensor/core.bend as Core
import bendtorch-core@0.1.0.0/src/tensor/matmul.bend as Matrix
import bendtorch-core@0.1.0.0/src/tensor/transforms.bend as Transforms

323# g @ right^T for the left operand. g and right are copied first, so a failure
324# loses neither.
325def left_product(+target: Nat, +shape: Shape.Shape, copy: Core.Dynamic,
326  pair: Core.Dynamic & Result<&2, &1, Transforms.Error, Core.Dynamic>) -> Core.Dynamic & Result<&2, &1, Error, Contribution>:
327  (right, transposed) = pair
328  match transposed:
329    case Fail{error}:
330      (right, Fail{TransformError{error}})
331    case Done{flipped}:
332      (right, multiplied(target, shape, Matrix.matmul(copy, flipped)))