Merge pull request #278 from python-adaptive/skopt-importerror

prevent ImportError due to scikit-optimize and sklearn incompatibility

Author: basnijholt

adaptive/tests/test_learners.py

@@ -29,7 +29,8 @@
 
 try:
     from adaptive.learner.skopt_learner import SKOptLearner
-except ModuleNotFoundError:
+except (ModuleNotFoundError, ImportError):
+    # XXX: catch the ImportError because of https://github.com/scikit-optimize/scikit-optimize/issues/902
     SKOptLearner = None