Forward and reverse Enzyme rules and tests for TensorOperations#451
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Jutho
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Jun 18, 2026
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Good points on both. I’ve tried moving the shared functions into the main
part of TK and encountered very strange errors (also for Mooncake) that I
punted on investigating too hard. I can try asking enzyme to generate its
own rules but given that wasn’t a blocker for the Mooncake version I’d be
ok with keeping this for now so at least something is working, then
iteratively pruning both sets of roles back.
…On Thu, Jun 18, 2026 at 11:01 AM Jutho ***@***.***> wrote:
***@***.**** commented on this pull request.
------------------------------
In ext/TensorKitEnzymeExt/tensoroperations.jl
<#451 (comment)>
:
> +function blas_contract_pullback_ΔA!(
+ ΔA, ΔC, A, pA, B, pB, pAB, α, backend, allocator
+ )
+ ipAB = invperm(linearize(pAB))
+ pΔC = _repartition(ipAB, TO.numout(pA))
+ ipA = _repartition(invperm(linearize(pA)), A)
+
+ tB = twist(
+ B,
+ TupleTools.vcat(
+ filter(x -> !isdual(space(B, x)), pB[1]),
+ filter(x -> isdual(space(B, x)), pB[2])
+ ); copy = false
+ )
+
+ project_contract!(
+ ΔA,
+ ΔC, pΔC, false,
+ tB, reverse(pB), true,
+ ipA, conj(α), backend, allocator
+ )
+
+ return nothing
+end
These generic rules should probably appear somewhere more centrally, in
the main TensorKit module? Also, same question as always: do we really need
to redefine all these rules? Can't AD do this for us, using only the rules
for the lower level primitives?
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