diff --git a/mloop/learners.py b/mloop/learners.py
index f5169a4..01c8ea1 100644
--- a/mloop/learners.py
+++ b/mloop/learners.py
@@ -1703,8 +1703,8 @@ def predict_costs_from_param_array(self,params):
         Returns:
             float : Predicted cost at paramters
         '''
-# TODO
-        return []
+        # TODO: Can do this more efficiently.
+        return [self.predict_cost(param) for param in params]
  
 
     def wait_for_new_params_event(self):