Fixed "project_to_admissible_set" to return no value

cashocs/_forms/control_form_handler.py

@@ -327,9 +327,7 @@ def restrict_to_inactive_set(
 
         return b
 
-    def project_to_admissible_set(
-        self, a: List[fenics.Function]
-    ) -> List[fenics.Function]:
+    def project_to_admissible_set(self, a: List[fenics.Function]) -> None:
         """Project a function to the set of admissible controls.
 
         Projects a control type function ``a`` onto the set of admissible controls
@@ -339,9 +337,6 @@ def project_to_admissible_set(
             a: The function which is to be projected onto the set of admissible
                 controls (is overwritten)
 
-        Returns:
-            The result of the projection (overwrites input ``a``)
-
         """
         for j in range(self.control_dim):
             if self.require_control_constraints[j]:
@@ -354,8 +349,6 @@ def project_to_admissible_set(
                 )
                 a[j].vector().apply("")
 
-        return a
-
     def _compute_gradient_equations(self) -> None:
         """Calculates the variational form of the gradient equation."""
         self.gradient_forms_rhs = [

cashocs/_forms/form_handler.py

@@ -320,8 +320,6 @@ def update_scalar_product(self) -> None:
         """Updates the scalar product."""
         pass
 
-    def project_to_admissible_set(
-        self, a: List[fenics.Function]
-    ) -> List[fenics.Function]:
+    def project_to_admissible_set(self, a: List[fenics.Function]) -> None:
         """Projects a function ``a`` onto the admissible set."""
         pass