Release v0.6.8

[lkdvos]

MatrixAlgebraKit.jl v0.6.8

Bug-fix release addressing several pullback issues — GPU compatibility for svd_pullback!, eigh, and eig pullbacks, correct handling of fully truncated decompositions, a cotangent-mutation bug in the LQ pullback, and an Enzyme caching fix — plus an svd gauge-fixing performance improvement and a new project logo. (Shout-out to @VictorVanthilt)

Highlights

• svd_pullback! now works on the GPU (#232).
• eigh and eig pullbacks now work on CUDA arrays (#235, #236).
• Pullbacks of eig_trunc, eigh_trunc, and svd_trunc no longer error when truncation keeps no values; the zero-rank case in svd_pullback! is also handled (#233).
• LQ pullback no longer mutates the input cotangents (#226).
• Corrected the Enzyme rule's check for when the cached output argument must be copied (#239).
• Improved svd gauge-fixing performance (#238).
• Extended AD test coverage to CUDA arrays for the polar decomposition and Mooncake projection rules (#237, #240).
• New MatrixAlgebraKit logo (#230).

Full Changelog

See CHANGELOG for the complete list of changes.

[Jutho]

Should we also get the GPU fixes for eig(h)_pullback in?

[codecov]

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[lkdvos]

I'll rebase and include them once the eig ones get fixed?

[kshyatt]

If you want to get this out asap I'd just merge it, I probably won't get to debugging the eig failure until tomorrow

[kshyatt]

All passed! Shall we merge?