Add Neighborhood Tensor Update (NTU)#144
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(Finally, after being delayed for over a year)
This PR adds the Neighborhood Tensor Update (NTU, arXiv 2107.06635), which works for both iPEPS and iPEPO, and supports nearest neighbor 2-site gates and arbitrary MPO gates (in particular, the next-nearest neighbor 3-site MPO).
When truncating a bond after applying a time evolution gate, the NTU uses some neighboring tensors as the bond environment, instead of using only a few bond weights (simple update) of the full iPEPS approximated by CTM (full update), "interpolating" between the two extremes. Currently the NN, NN+ and NNN bond environments (see description in the YASTN package) are implemented.
Here I do not provide a version of
time_evolvefor ground state search. Since the state virtual space may change during the evolution, it is a bit tricky to keep track of it and reconverge the CTMRG environment for energy measurement.