out of sample functionality for Bass model #2099
Description
The Bass model should support out of sample predictions like with the other model objects.
Work around
Out of sample predictions can be done by making a predictive_model with the create_bass_model function then using the pm.sample_posterior_predictive function. However, there are some caveats to be aware of:
- Deterministics are in the posterior so they have to be filtered out manually.
Related to #1647