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Handle exception when BQM is passed to DQM sampler #444

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Handle exception when BQM is passed to DQM sampler #444

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dc53ec4
Handle exception when BQM is passed to DQM sampler
Abdullahjavednesar Feb 28, 2022
ff432b4
moved import on top and exception handling in sample_dqm
Abdullahjavednesar Mar 1, 2022
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3 changes: 3 additions & 0 deletions dwave/system/samplers/leap_hybrid_sampler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,7 @@

bqm_to_file = FileView

from dimod.discrete.discrete_quadratic_model import DiscreteQuadraticModel
from dwave.cloud import Client
from dwave.system.utilities import classproperty, FeatureFlags

Expand Down Expand Up @@ -465,6 +466,8 @@ def sample_dqm(self, dqm, time_limit=None, compress=False, compressed=None, **kw
See the example in :class:`LeapHybridDQMSampler`.

"""
if not isinstance(dqm, DiscreteQuadraticModel):
raise TypeError(f"Expecting DiscreteQuadraticModel object, got {type(dqm)}")
if time_limit is None:
time_limit = self.min_time_limit(dqm)
elif time_limit < self.min_time_limit(dqm):
Expand Down
4 changes: 4 additions & 0 deletions tests/test_leaphybriddqmsolver.py
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Expand Up @@ -54,13 +54,17 @@ def get_solver(self, *args, **kwargs):
sampler = LeapHybridDQMSampler()

dqm = dimod.DQM()
bqm = dimod.BinaryQuadraticModel('SPIN')

with self.assertRaises(ValueError):
sampler.sample_dqm(dqm, time_limit=1)

with self.assertRaises(ValueError):
sampler.sample_dqm(dqm, time_limit=10000000)

with self.assertRaises(TypeError):
sampler.sample_dqm(bqm)

def test_DQM_subclass_without_serialization_can_be_sampled(self):
"""Test that DQM subclasses that do not implement serialization can
still be sampled by LeapHybridDQMSampler.
Expand Down