Error in Saving model objects for HDDMrl: 'Cannot pickle pymc.LazyFunction.Counter' Object

[oneyearmoreone]

When using the hddm.Hrl or hddm.RLDDM models and attempting to save the ProMCMC chain data, users may encounter the error: "fail to save model: cannot pickle 'pymc.LazyFunction.Counter' object". This issue arises due to the inability of Python's pickle module to serialize certain PyMC objects, specifically the LazyFunction.Counter. This post discusses potential workarounds and solutions to resolve the problem and successfully save the MCMC chain data.

[panwanke]

Thank you for raising this question. A detailed explanation has been provided in the tutorial RLDDM.ipynb.

To summarize:

1. The hddm package does not support saving RLDDM models directly, and this limitation remains even in our optimized version.
2. As an alternative, you can save the model's parameter results using the save_name argument to specify the location and filename, as described in the tutorial.

Hope this helps!