`DWaveCliqueSampler` occasionally produces an out-of-range qubit coupling

[randomir]

A per-group-coupling-range test occasionally fails with:

======================================================================
ERROR: test_per_qubit_coupling_range_3_Zephyr (tests.qpu.test_dwavecliquesampler.TestDWaveCliqueSampler.test_per_qubit_coupling_range_3_Zephyr)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/distiller/project/env/lib/python3.13/site-packages/parameterized/parameterized.py", line 530, in standalone_func
    return func(*(a + p.args), **p.kwargs)
  File "/Users/distiller/project/tests/qpu/test_dwavecliquesampler.py", line 92, in test_per_qubit_coupling_range
    sampler.sample(bqm, chain_strength=chain_strength).resolve()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/Users/distiller/project/env/lib/python3.13/site-packages/dimod/sampleset.py", line 1490, in resolve
    samples = self._result_hook(self._future)
  File "/Users/distiller/project/env/lib/python3.13/site-packages/dimod/sampleset.py", line 1374, in hook
    sampleset.resolve()
    ~~~~~~~~~~~~~~~~~^^
  File "/Users/distiller/project/env/lib/python3.13/site-packages/dimod/sampleset.py", line 1490, in resolve
    samples = self._result_hook(self._future)
  File "/Users/distiller/project/dwave/system/composites/embedding.py", line 314, in async_unembed
    response.resolve()
    ~~~~~~~~~~~~~~~~^^
  File "/Users/distiller/project/env/lib/python3.13/site-packages/dimod/sampleset.py", line 1490, in resolve
    samples = self._result_hook(self._future)
  File "/Users/distiller/project/env/lib/python3.13/site-packages/dimod/decorators.py", line 86, in <lambda>
    return SampleSet.from_future(next(iterator), lambda _: next(iterator))
                                                           ~~~~^^^^^^^^^^
  File "/Users/distiller/project/env/lib/python3.13/site-packages/dwave/preprocessing/composites/scale.py", line 138, in sample
    sampleset.record.energy *= 1 / scalar
    ^^^^^^^^^^^^^^^^
  File "/Users/distiller/project/env/lib/python3.13/site-packages/dimod/sampleset.py", line 1126, in record
    self.resolve()
    ~~~~~~~~~~~~^^
  File "/Users/distiller/project/env/lib/python3.13/site-packages/dimod/sampleset.py", line 1491, in resolve
    self.__init__(samples.record, samples.variables, samples.info, samples.vartype)
                  ^^^^^^^^^^^^^^
  File "/Users/distiller/project/env/lib/python3.13/site-packages/dimod/sampleset.py", line 1126, in record
    self.resolve()
    ~~~~~~~~~~~~^^
  File "/Users/distiller/project/env/lib/python3.13/site-packages/dimod/sampleset.py", line 1490, in resolve
    samples = self._result_hook(self._future)
  File "/Users/distiller/project/dwave/system/samplers/dwave_sampler.py", line 492, in _hook
    raise exc
  File "/Users/distiller/project/dwave/system/samplers/dwave_sampler.py", line 479, in _hook
    return resolve(computation)
  File "/Users/distiller/project/dwave/system/samplers/dwave_sampler.py", line 469, in resolve
    sampleset.resolve()
    ~~~~~~~~~~~~~~~~~^^
  File "/Users/distiller/project/env/lib/python3.13/site-packages/dimod/sampleset.py", line 1490, in resolve
    samples = self._result_hook(self._future)
  File "/Users/distiller/project/env/lib/python3.13/site-packages/dwave/cloud/computation.py", line 835, in <lambda>
    sampleset = dimod.SampleSet.from_future(self, lambda f: f.wait_sampleset())
                                                            ~~~~~~~~~~~~~~~~^^
  File "/Users/distiller/project/env/lib/python3.13/site-packages/dwave/cloud/computation.py", line 773, in wait_sampleset
    self._load_result()
    ~~~~~~~~~~~~~~~~~^^
  File "/Users/distiller/project/env/lib/python3.13/site-packages/dwave/cloud/computation.py", line 909, in _load_result
    raise self._exception
  File "/Users/distiller/project/env/lib/python3.13/site-packages/dwave/cloud/client/base.py", line 1347, in _handle_problem_status
    raise SolverFailureError(errmsg)
dwave.cloud.exceptions.SolverFailureError: Total coupling -13.000 for qubit 2793 to qubits 1730,1741,1754,1765,1778,1789,1802,1813,2792,2804 is out of range (-13.000 10.000).

Coupling values in this case are (on solver Advantage2_system1.5):

[np.float64(-1.7660377358490567), np.float64(-1.7660377358490567), np.float64(-1.7660377358490567), np.float64(-1.7660377358490567), np.float64(-1.7660377358490567), np.float64(-1.7660377358490567), np.float64(-1.7660377358490567), np.float64(-0.44150943396226416), np.float64(-0.1962264150943396)]

with the total sum of:

-13.000000000000002

So the lower bound of per_group_coupling_range (-13) is indeed exceeded, but due to float64 precision limits.

Arguably, this edge case should be handled on SAPI side, as the quoted precision is only 3 digits (-13.000).

[arcondello]

I swore we fixed this... #572.

Edit: I see. Different bound.