Allow D_init and nothing tolerances
#4
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We had some strange cases where we "converged" in the norm all the way to zero, but were still making progress in the nnz.
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By setting
D_init, we can, for example, use dictionaries from previous runs that have been generated with higher tolerances.By setting both tolerances to
nothingthey don't trigger even when the norm between the last two steps is 0. This can happen if progress in the sparse encoding is still made, but not in the dictionary.