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Return InferenceData when there are no variables sampled and extend=True #7509

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Sep 18, 2024
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Return InferenceData when there are no variables sampled and extend=True #7509

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2 changes: 1 addition & 1 deletion pymc/sampling/forward.py
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Original file line number Diff line number Diff line change
Expand Up @@ -825,7 +825,7 @@ def sample_posterior_predictive(
if return_inferencedata and not extend_inferencedata:
return InferenceData()
elif return_inferencedata and extend_inferencedata:
return trace
return trace if idata is None else idata
return {}

vars_in_trace = get_vars_in_point_list(_trace, model)
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5 changes: 5 additions & 0 deletions tests/sampling/test_forward.py
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Expand Up @@ -492,6 +492,11 @@ def test_normal_scalar(self):
ppc = pm.sample_posterior_predictive(trace, var_names=[], return_inferencedata=False)
assert len(ppc) == 0

# test empty ppc with extend_inferencedata
assert isinstance(trace, InferenceData)
ppc = pm.sample_posterior_predictive(trace, var_names=[], extend_inferencedata=True)
assert ppc is trace

# test keep_size parameter
ppc = pm.sample_posterior_predictive(trace, return_inferencedata=False)
assert ppc["a"].shape == (nchains, ndraws)
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