rework TensorOperations implementation to use backend and allocator#311
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rework TensorOperations implementation to use backend and allocator#311
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Very nice; I think there is one typo/mistake, but otherwise this is indeed a great and long overdue change. Tanks for tackling this.
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* initial basic design SectorVector * some additional functionality * relax `foreachblock` signature * replace `SectorDict` with `SectorVector` for eig/svdvals * export `svd_vals` * clean up SectorVector design * small fix * add finitedifferences support * update changelog * some simplifications and extensions * some further fixes * some more fixes * update dates --------- Co-authored-by: Jutho Haegeman <jutho.haegeman@ugent.be>
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This removes one of the TODOs by bringing the
contract!interface more in line with the TensorOperations functionality, which allows us to now use thebackendandallocatorfunctionality a bit more fully.Additionally, I slightly reworked the logic of surrounding
twistto avoid some more allocations in some edge cases where we didn't have to permute A, but we did have to twist it.This is a partial reimplementation of some of the logic in #203 but I kept this PR way more minimal and less opinionated, to already get this merged and then simplify actually looking at the multithreading afterwards.
One other thing I noticed is that our
memcostchecking could use some improvements still: we will never simplify the following case for example, which actually could be implemented as a simplemul!call.This however is somewhat related to the planar reorderings that we are doing anyways, so it might actually pay off to at some point (in a separate PR!) have a look at this.