fix NameError: self.learner.remove_unfinished()

adaptive/runner.py

@@ -84,7 +84,7 @@ class Runner:
                     self.learner.add_point(x, y)
         finally:
             # cancel any outstanding tasks
-            learner.remove_unfinished()
+            self.learner.remove_unfinished()
             cancelled = all(fut.cancel() for fut in xs.keys())
             if not cancelled:
                 raise RuntimeError('Some futures remain uncancelled')