Add `turbo` parameter with test

pysr/sr.py

@@ -1587,7 +1587,6 @@ class PySRRegressor(MultiOutputMixin, RegressorMixin, BaseEstimator):
             early_stop_condition=early_stop_condition,
             seed=seed,
             deterministic=self.deterministic,
-            extend_user_operators=False,
             define_helper_functions=False,
         )
 

test/test.py

@@ -70,12 +70,13 @@ class TestPipeline(unittest.TestCase):
         print(model.equations_)
         self.assertLessEqual(model.get_best()["loss"], 1e-4)
 
-    def test_multiprocessing(self):
+    def test_multiprocessing_turbo(self):
         y = self.X[:, 0]
         model = PySRRegressor(
             **self.default_test_kwargs,
             procs=2,
             multithreading=False,
+            turbo=True,
             early_stop_condition="stop_if(loss, complexity) = loss < 1e-4 && complexity == 1",
         )
         model.fit(self.X, y)