Minor fix

Author: FilippoOlivo

pina/callback/refinement/refinement_interface.py

@@ -90,10 +90,10 @@ def per_point_residual(self, conditions_name=None):
             tot_loss.append(torch.abs(target))
         return torch.vstack(tot_loss).tensor.mean(), res_loss
 
-    def _compute_residual(self, pts, equation):
-        pts.requires_grad_(True)
-        pts.retain_grad()
-        return equation.residual(pts, self.solver.forward(pts))
+    def _compute_residual(self, points, equation):
+        points.requires_grad_(True)
+        points.retain_grad()
+        return equation.residual(points, self.solver.forward(points))
 
     @abstractmethod
     def sample(self, condition):