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. Author manuscript; available in PMC: 2021 Mar 9.
Published in final edited form as: IEEE Trans Comput Imaging. 2020 Oct 15;6:1451–1458. doi: 10.1109/TCI.2020.3031082

Table I.

Number of nonzero elements, memory usage, and NRMSE of the inverse of each factorization in a toy problem of size 20 × 16 × 8.

H H−1 Lc Lt L0
Number of nonzeros (× 105) 1.67 655 72.5 1.77 0.96
Storage (megabytes) 0.31 100.1 11.9 0.53 0.27
NRMSE 3e-16 4e-3 3e-2