api: prevent evaluated derivatives to be re-evaluted

mloubout · mloubout · commit 00888ce03eb2 · 2026-01-06T22:53:29.000-05:00
diff --git a/devito/types/basic.py b/devito/types/basic.py
@@ -984,7 +984,7 @@ def c0(self):
     def _eval_deriv(self):
         return self
 
-    @property
+    @cached_property
     def _grid_map(self):
         """
         Mapper of off-grid interpolation points indices for each dimension.
