add pickle import back in for pickle.PickleError

Spaak · Spaak · commit f2e96e97881b · 2021-07-13T09:31:16.000+02:00
diff --git a/pymc3/sampling.py b/pymc3/sampling.py
@@ -16,6 +16,7 @@
 
 import collections.abc as abc
 import logging
+import pickle
 import sys
 import time
 import warnings
