Smoothing and Regularization with Modified Sparse Approximate Inverses

Figure 2

Smoothing factor 𝜇 against subspace weight 𝜌. MSPAI using individual (a) and global (b) probing conditions compared to Jacobi, SPAI, and 𝑀5_opt (26) for the 2D constant-coefficient model problem 𝐴₂ of size 𝑛=1024.

(a) MSPAI using individual probing conditions

(b) MSPAI using global probing conditions