save_experiment issues a warning when copy fails

Author: bartzbeielstein

pyproject.toml

@@ -7,7 +7,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "spotpython"
-version = "0.15.17"
+version = "0.15.18"
 authors = [
   { name="T. Bartz-Beielstein", email="tbb@bartzundbartz.de" }
 ]

src/spotpython/spot/spot.py

@@ -2308,7 +2308,13 @@ def save_experiment(self, filename=None) -> None:
         optimizer_control = copy.deepcopy(self.optimizer_control)
         surrogate_control = copy.deepcopy(self.surrogate_control)
         design_control = copy.deepcopy(self.design_control)
-        spot_tuner = copy.deepcopy(self)
+        # try to copy the spot_tuner object. If not possible,issue a warning and set spot_tuner to None.
+        try:
+            spot_tuner = copy.deepcopy(self)
+        except Exception as e:
+            logger.warning("Warning: Could not copy/save spot_tuner object!")
+            logger.warning(f"Error: {e}")
+            spot_tuner = None
         experiment = {
             "design_control": design_control,
             "fun_control": fun_control,