trunk/666b41fe6f33957e2ade4bd9b82f35d67857867f: [MPS] Fix SVD normalization for small singular values (#200536)

发生了什么

Fix MPS SVD dropping valid singular vectors below an absolute epsilon, causing incorrect pseudoinverses and least-squares solutions. Reproducer: import torch for device in ("cpu", "mps"): eye = torch.eye(4, dtype=torch.float32, device=device) a = 1e-8 * eye print(device, "pinv:", torch.linalg.pinv(a).cpu()) print(device, "lstsq:", torch.linalg.lstsq(a, eye).solution.cpu()) output on main: cpu pinv: tensor([[10000000…

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