relax tolerance per ivf_flat is unstable with default None algoParam

Signed-off-by: Jinfeng <[email protected]>

python/tests/test_approximate_nearest_neighbors.py

@@ -627,7 +627,7 @@ def test_ivfflat(
     # cuvs ivf_flat None sets nlist to 1000 and nprobe to 20, leading to unstable results when run multiple times
     expected_avg_recall: float = 0.95 if algoParams != None else 0.5
     expected_avg_dist_gap: float = 1e-4 if algoParams != None else 1e-2
-    tolerance: float = 1e-4 if algoParams != None else 1e-2
+    tolerance: float = 1e-4 if algoParams != None else 0.05
     data_shape: Tuple[int, int] = (10000, 50)
     ann_algorithm_test_func(
         combo=combo,