diff --git a/benchmark/tests/GridSearch_test.py b/benchmark/tests/GridSearch_test.py
index 9bd7539..225fb12 100644
--- a/benchmark/tests/GridSearch_test.py
+++ b/benchmark/tests/GridSearch_test.py
@@ -35,7 +35,7 @@ class GridSearchTest(unittest.TestCase):
         file_name = self.grid.get_output_file()
         if os.path.exists(file_name):
             os.remove(file_name)
-        grid = self.build_exp()
+        _ = self.build_exp()
         # check the output file is initialized
         with open(file_name) as f:
             data = json.load(f)
diff --git a/benchmark/tests/results/grid_output_accuracy_STree.json b/benchmark/tests/results/grid_output_accuracy_STree.json
index 78c3c0a..0cde0e8 100644
--- a/benchmark/tests/results/grid_output_accuracy_STree.json
+++ b/benchmark/tests/results/grid_output_accuracy_STree.json
@@ -6,7 +6,7 @@
             "kernel": "liblinear",
             "multiclass_strategy": "ovr"
         },
-        "v. 1.2.4, Computed on Test on 2022-04-24 at 00:15:45 took 0.240s"
+        "v. 1.2.4, Computed on Test on 2022-04-24 at 00:18:17 took 0.261s"
     ],
     "balloons": [
         0.625,
@@ -15,6 +15,6 @@
             "kernel": "linear",
             "multiclass_strategy": "ovr"
         },
-        "v. 1.2.4, Computed on Test on 2022-04-24 at 00:15:45 took 0.253s"
+        "v. 1.2.4, Computed on Test on 2022-04-24 at 00:18:17 took 0.478s"
     ]
 }
\ No newline at end of file