Bug#1125746: qutip: autopkgtest failure with Python 3.14

[Graham Inggs]

Source: qutip
Version: 5.2.1-4
Severity: serious
Tags: forky sid
User: debian-python at lists.debian.org
Usertags: python3.14

Hi Maintainer

The autopkgtests of this package fail with Python 3.14 [1].  I've
copied what I hope is the relevant part of the log below.

Regards
Graham


[1] https://ci.debian.net/packages/q/qutip/testing/amd64/


843s =================================== FAILURES
===================================
843s ________________ test_open_integrator[simple-Taylor15 implicit]
________________
843s
843s method = 'taylor1.5_imp', order = 1.5
843s H = QobjEvo: dims = [[5], [5]], shape = (5, 5), type = oper,
superrep = None, isconstant = True, num_elements = 1
843s c_ops = []
843s sc_ops = [QobjEvo: dims = [[5], [5]], shape = (5, 5), type =
oper, superrep = None, isconstant = True, num_elements = 1]
843s
843s     @pytest.mark.parametrize(["method", "order"], [
843s         pytest.param("euler", 0.5, id="Euler"),
843s         pytest.param("milstein", 1.0, id="Milstein"),
843s         pytest.param("milstein_imp", 1.0, id="Milstein implicit"),
843s         pytest.param("platen", 1.0, id="Platen"),
843s         pytest.param("pred_corr", 1.0, id="PredCorr"),
843s         pytest.param("rouchon", 1.0, id="rouchon"),
843s         pytest.param("explicit1.5", 1.5, id="Explicit15"),
843s         pytest.param("taylor1.5_imp", 1.5, id="Taylor15 implicit"),
843s     ])
843s     @pytest.mark.parametrize(['H', 'c_ops', 'sc_ops'], [
843s         pytest.param("qeye", [], ["destroy"], id='simple'),
843s         pytest.param("qeye", ["destroy"], ["destroy"], id='simple
+ collapse'),
843s         pytest.param("herm", ["destroy", "destroy2"], [], id='2 c_ops'),
843s         pytest.param("herm", [], ["destroy", "destroy2"], id='2 sc_ops'),
843s         pytest.param("herm", ["create", "destroy"], ["destroy",
"destroy2"],
843s                      id='many terms'),
843s         pytest.param("herm", [], ["random"], id='random'),
843s         pytest.param("herm", ["random"], ["random"], id='complex'),
843s         pytest.param("herm td", ["random"], ["destroy"], id='H td'),
843s         pytest.param("herm", ["random"], ["destroy td"], id='sc_ops td'),
843s     ])
843s     def test_open_integrator(method, order, H, c_ops, sc_ops):
843s         N = 5
843s         H = _make_oper(H, N)
843s         c_ops = [_make_oper(op, N) for op in c_ops]
843s         sc_ops = [_make_oper(op, N) for op in sc_ops]
843s
843s         rhs = _StochasticRHS(StochasticOpenSystem, H, sc_ops, c_ops, False)
843s         ref_sode =
SMESolver.avail_integrators()["taylor1.5"](rhs, {"dt": 0.01})
843s         sode = SMESolver.avail_integrators()[method](rhs, {"dt": 0.01})
843s         state = operator_to_vector(fock_dm(5, 3, dtype="Dense")).data
843s
843s         error_order = get_error_order_integrator(sode, ref_sode, state)
843s >       assert (order + 0.35) < error_order
843s E       assert (1.5 + 0.35) < np.float64(1.8064917223554944)
843s
843s tests/solver/test_sode_method.py:154: AssertionError