pymc-devs/pymc
Ver no GitHubBUG: `pm.sample_posterior_predictive` discards new results when `extend_inferencedata=True` and `posterior_predictive` group already exists
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#7.214 aberto em 22 de mar. de 2024
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Description
Describe the issue:
pm.sample_posterior_predictive silently fails when extend_inferencedata = True and posterior_predictive group exists
Reproduceable code example:
import pymc as pm
import numpy as np
y = np.random.normal(loc=1, size=(100,))
with pm.Model() as m:
mu = pm.Normal('mu')
y_hat = pm.Normal('y_hat', mu=mu, sigma=1, observed=y)
idata = pm.sample()
idata = pm.sample_posterior_predictive(idata, extend_inferencedata=True)
with pm.Model() as m2:
new_mu = pm.Normal('mu2', sigma=10)
y_hat = pm.Normal('y_hat', mu=new_mu, sigma=1)
idata = pm.sample_posterior_predictive(idata, extend_inferencedata=True)
Error message:
No response
PyMC version information:
Context for the issue:
In the above snippet, the 2nd sample_posterior_predictive will not error, but the samples will not be associated with the new_mu model.