Pickle error while using lambda function

[avi]

Please see this thread and let me know if this helps

When I am custom likelihood example I get pickle error when multiple chains are used

Hello Everyone, I am trying to use this example ([https://docs.pymc.io/notebooks/blackbox_external_likelihood.html](http://Black Box Example))) without gradient part. However, I get the pickling error when using lambda function and number of chains > 1. Could some body please point me to the correct direction? When I read though various messages on this forum, it has been suggested that the latest version fixes the problem. I am using the latest version from the repo. I am on Windows 10 and u…