Don't mask out zero elements on the diagonal of the matrix when inverting triangular matrices. #15026
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…ting triangular matrices. The intent of this code seems to have been to mask out zeros that were part of padding on the diagonal. However, this isn't correct: if there is a zero on the diagonal, we very much want to get an inf or nan! We also appear to now pad with the identity matrix. Fixes jax-ml/jax#3589 Fixes jax-ml/jax#15429 PiperOrigin-RevId: 653562611
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Don't mask out zero elements on the diagonal of the matrix when inverting triangular matrices.
The intent of this code seems to have been to mask out zeros that were part of padding on the diagonal. However, this isn't correct: if there is a zero on the diagonal, we very much want to get an inf or nan! We also appear to now pad with the identity matrix.
Fixes jax-ml/jax#3589
Fixes jax-ml/jax#15429