www-ai.cs.tu-dortmund.de/LEHRE/VORLESUNGEN/LOPT/SS16/papers/FISTA.pdf
8633002> /CHT <FEFF4f7f752890194e9b8a2d7f6e5efa7acb7684002000410064006f006200650020005000440046002065874ef69069752865bc9ad854c18cea76845370524d5370523786557406300260a853ef4ee54f7f752800200041006300720 [...] 4380438002e> /CHS <FEFF4f7f75288fd94e9b8bbe5b9a521b5efa7684002000410064006f006200650020005000440046002065876863900275284e8e9ad88d2891cf76845370524d53705237300260a853ef4ee54f7f75280020004100630072006f0 [...] matrix-vector multiplication involving A and AT followed by a shrinkage/soft-threshold step;1 see, e.g., [7, 15, 10, 34, 18, 35]. Specifically, the general step of ISTA is
(1.4) xk+1 = T λt
( xk − 2tAT (Axk − …