v0.6.8

MatrixAlgebraKit v0.6.8

Diff since v0.6.7

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.

Merged pull requests:

• fix: LQ pullback modifies input cotangents (#226) (@lkdvos)
• Add a MatrixAlgebraKit logo (#230) (@lkdvos)
• Make svd_pullback! GPU-compatible (#232) (@kshyatt)
• fix: special case pullbacks for fully truncated decompositions (#233) (@lkdvos)
• Release v0.6.8 (#234) (@lkdvos)
• Working pullback and tests for EIGH + CUDA (#235) (@kshyatt)
• Working EIG + CUDA AD (#236) (@kshyatt)
• Test polar AD for CUDA (#237) (@kshyatt)
• Improve svd gaugefixing performance (#238) (@kshyatt)
• Fix check of whether to copy arg for Enzyme (#239) (@kshyatt)
• Test Mooncake projection rules for CUDA (#240) (@kshyatt)

Closed issues:

• SVD pullback rules aren't GPU-friendly (#228)
• EIGH pullback rules aren't GPU-friendly (#229)