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Add warning not to intialize walkers in same starting place #39

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Add warning not to intialize walkers in same starting place #39

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5 changes: 4 additions & 1 deletion zeus/ensemble.py
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Original file line number Diff line number Diff line change
Expand Up @@ -494,6 +494,9 @@ def sample(self,
if not np.all(np.isfinite(Z)):
raise ValueError('Invalid walker initial positions! \n' +
'Initialise walkers from positions of finite log probability.')
if self.nwalkers > 1 and (X == X[0]).all():
raise ValueError('Invalid walker initial positions! \n' +
'Initialise walkers from different starting positions.')
batch = list(np.arange(self.nwalkers))

# Extend saving space
Expand Down Expand Up @@ -724,4 +727,4 @@ def sample(self,
class sampler(EnsembleSampler):
def __init__(self, *args, **kwargs):
logging.warning('The sampler class has been deprecated. Please use the new EnsembleSampler class.')
super().__init__(*args, **kwargs)
super().__init__(*args, **kwargs)