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                                            TianHao-Yang-tim

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

> You can also use a autograd optimizer directly like so, this is a much more stable algorithm than periodic DMRG: > > mps = qtn.MPS_rand_state(L, bond_dim=20, phys_dim=2, cyclic=True) >...

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

Hi @jcmgray, I’ve followed your advice and obtained a much more stable result for the 50-qubit chain. Thank you so much! I still have a couple of questions: 1. L...

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

Thank you so much! It works after specifying 'autograd' with TNOptimizer. I have tried PBC DMRG on Heissenberg model as notebook and get great result before testing Ising. Now I...