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Fix BlockSampler validation of a graph with self edges #70

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Fix BlockSampler validation of a graph with self edges #70

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2 changes: 2 additions & 0 deletions dwave/plugins/torch/samplers/block_spin_sampler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -174,6 +174,8 @@ def _valid_colouring(self) -> bool:
bool: True if the colouring is valid and False otherwise.
"""
for u, v in self._grbm.edges:
if u == v:
continue
if self._colouring(u) == self._colouring(v):
return False
return True
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