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                                            TianHao-Yang-tim

DMRG2 + MPO_ham_ising(..., cyclic=True) gives ~0 energy and almost-zero state norm

### What happened? ### Summary When using `quimb.tensor.DMRG2` with a **periodic** Ising Hamiltonian constructed via `MPO_ham_ising(..., cyclic=True)`, the DMRG2 energy is extremely close to zero, while the same Hamiltonian converted...

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