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Add K & KT as customizable input for recon#2

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Add K & KT as customizable input for recon#2
vjspi wants to merge 1 commit intokhammernik:masterfrom
vjspi:master

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@vjspi vjspi commented Aug 9, 2023

Added K and KT as optional input for BaseReconOptimizer and adapted recon_optimizer_th.py accordingly

Allows custom creation regularization operator, e.g. for summing up multiple dynamics

Example input for K:
K = lambda x, mode, beta: torch.stack([Nabla(mode=mode, beta=beta).forward(x[:, i, ...]) for i in range(x.shape[1])])

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