Pass device to Hamiltonian, pass to pauli_string_to_matrix #292
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pauli_string_to_matrixtakes a device argument, which defaults totorch.device('cpu'):torchquantum/torchquantum/util/utils.py
Line 990 in 611cc2a
When trying to use
Hamiltonianon GPU this invariably leads to device errors, since the result frompauli_string_to_matrixwill be on CPU, so it would be nice to be able to pass device to Hamiltonian, which passes it on topauli_string_to_matrix. Setting the default toNoneensures that not previous behaviour is changed.