diff --git a/image_ref/main_ray.py b/image_ref/main_ray.py
index c66087cb3ab2c67e121054838556b0d57253129b..90f45583da74f8374e5aca0fda7bb61c0043b812 100644
--- a/image_ref/main_ray.py
+++ b/image_ref/main_ray.py
@@ -212,7 +212,7 @@ def test_model(best_result, args):
 def main(args, gpus_per_trial=1):
     config = {
         "lr": tune.loguniform(1e-4, 1e-2),
-        "noise": tune.loguniform(0, 500),
+        "noise": tune.loguniform(1e-7, 500),
         "positive_prop": tune.uniform(0, 100),
         "optimizer": tune.choice(['Adam', 'SGD']),
         "sampler": tune.choice(['random', 'balanced']),