trunk/13948faea12f1eb3a6df72f181a51f3e65dbf309: [MPS] Orthonormalize null-space U columns in svd_jacobi (#196139)

发生了什么

The native Jacobi SVD forms U as (A V)_j / sigma_j, which collapses to zero for sigma_j at the noise floor, so rank-deficient inputs got a non-orthonormal U (U^H U != I) even though A = U S V^H still held. Replace those null columns with an orthonormal completion of the emitted columns (simd-group-parallel Gram-Schmidt of canonical vectors, like gesdd). Full-rank inputs are unaffected since the completion loop has z…

摘要按规则整理自下方来源原文

来源