Pullbacks for Diagonal inputs
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FWIW there was some work done for this in the |
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So you might be able to cannibalize part of that |
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Ahh, thanks! let me first revisit that then :) |
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Just grab whatever you need from there imo and I can rebase on top of this once it's merged |
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Ran into some issues in QuantumKitHub/TensorKit.jl#350, we are currently not testing pullbacks for$\Delta A$ , but we need an additional projection on the diagonal subspace.
Diagonalinputs, and apparently this is not working right now.The issue is that we want to in-place add to
I'm guessing similar issues would appear for other restricted input vector spaces, for now I'd be okay with this simple fix only for diagonal.
I'll try add a similar thing for the other pullbacks as well. In principle we can probably improve the performance a bit more but I'm not sure if this is worth the effort.