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In the documentation, subchapter "Define VQE cost function" (http://docs.qulacs.org/en/latest/apply/6.2_vqe.html#Define-VQE-cost-function) the return value of the cost function should be np.real(qulacs_hamiltonian.get_expectation_value(state)) instead of qulacs_hamiltonian.get_expectation_value(state). This is because of the scipy.optimize.minimize function in http://docs.qulacs.org/en/latest/apply/6.2_vqe.html#Run-VQE, which expects a cost function returning a float not a complex number.
np.real(qulacs_hamiltonian.get_expectation_value(state))
qulacs_hamiltonian.get_expectation_value(state)
scipy.optimize.minimize
The text was updated successfully, but these errors were encountered:
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In the documentation, subchapter "Define VQE cost function" (http://docs.qulacs.org/en/latest/apply/6.2_vqe.html#Define-VQE-cost-function) the return value of the cost function should be
np.real(qulacs_hamiltonian.get_expectation_value(state))instead of
qulacs_hamiltonian.get_expectation_value(state).This is because of the
scipy.optimize.minimizefunction in http://docs.qulacs.org/en/latest/apply/6.2_vqe.html#Run-VQE, which expects a cost function returning a float not a complex number.The text was updated successfully, but these errors were encountered: