add Python example running LBFGSB-PC #1663
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Implementation of
Tsai et al,
"Fast Quasi-Newton Algorithms for Penalized Reconstruction in Emission Tomography and Further Improvements via reconditioning"
IEEE TRANSACTIONS ON MEDICAL IMAGING, VOL. 37, NO. 4, APRIL 2018
DOI: 10.1109/TMI.2017.2786865
https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8239640
Loosely based on a (non-class/non-SIRF) implementation by @gschramm at https://github.com/SyneRBI/PETRIC-MaGeZ/blob/a690205b2e3ec874e621ed2a32a802cd0bed4c1d/simulation_src/sim_stochastic_grad.py but with using diag(H.1) as preconditioner at the moment, as per Tsai's paper.
LBFGBPC.py is derived from SyneRBI/SIRF-Contribs#23, but with some modifications for STIR Python