Question about density matrix algorithm for MPO-MPS contraction
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I have a question about the sentence below on the page MPO-MPS Multiplication: Density Matrix Algorithm.
tensornetwork.org/src/mps/algorithms/denmat_mpo_mps/index.md
Lines 59 to 61 in 32c3234
Consider the contraction of the overlap tensor
Does the sentence mean that the tensor
Thanks for the question. Basically the steps are to prepare
Thank you for your reply.
I have understood the meaning of the sentence.
I am currently trying to check the optimal contraction order and will report back when it is done.
If my estimate is correct, a "top-down" order (↗︎→↘︎↗︎ in the figure below) is more efficient than the suggested order (↗︎↗︎↘︎↘︎).
The "top-down" order requires
Therefore, the suggested order requires