diff --git a/deepspeech/exps/deepspeech2/model.py b/deepspeech/exps/deepspeech2/model.py
index a163ef4ca133465f7d93478f1bda48c07fca34fa..b1ff5c591404152f7c96357e564ca700a2d73c74 100644
--- a/deepspeech/exps/deepspeech2/model.py
+++ b/deepspeech/exps/deepspeech2/model.py
@@ -323,12 +323,12 @@ class DeepSpeech2Tester(DeepSpeech2Trainer):
         config.data.manifest = config.data.test_manifest
         config.data.keep_transcription_text = True
         config.data.augmentation_config = ""
-        config.data.min_input_len = 0.0  # second
-        config.data.max_input_len = float('inf')  # second
-        config.data.min_output_len = 0.0  # tokens
-        config.data.max_output_len = float('inf')  # tokens
-        config.data.min_output_input_ratio = 0.00
-        config.data.max_output_input_ratio = float('inf')
+        # config.data.min_input_len = 0.0  # second
+        # config.data.max_input_len = float('inf')  # second
+        # config.data.min_output_len = 0.0  # tokens
+        # config.data.max_output_len = float('inf')  # tokens
+        # config.data.min_output_input_ratio = 0.00
+        # config.data.max_output_input_ratio = float('inf')
         test_dataset = ManifestDataset.from_config(config)
 
         # return text ord id
diff --git a/deepspeech/exps/u2/model.py b/deepspeech/exps/u2/model.py
index 7a409d98807c18154e3170e2974e4bb5e3e601d3..0bcd1d22421b01d2f9df6e7a208b0557256465ac 100644
--- a/deepspeech/exps/u2/model.py
+++ b/deepspeech/exps/u2/model.py
@@ -254,12 +254,12 @@ class U2Trainer(Trainer):
         config.data.manifest = config.data.test_manifest
         config.data.keep_transcription_text = True
         config.data.augmentation_config = ""
-        config.data.min_input_len = 0.0  # second
-        config.data.max_input_len = float('inf')  # second
-        config.data.min_output_len = 0.0  # tokens
-        config.data.max_output_len = float('inf')  # tokens
-        config.data.min_output_input_ratio = 0.00
-        config.data.max_output_input_ratio = float('inf')
+        # config.data.min_input_len = 0.0  # second
+        # config.data.max_input_len = float('inf')  # second
+        # config.data.min_output_len = 0.0  # tokens
+        # config.data.max_output_len = float('inf')  # tokens
+        # config.data.min_output_input_ratio = 0.00
+        # config.data.max_output_input_ratio = float('inf')
         test_dataset = ManifestDataset.from_config(config)
         # return text ord id
         self.test_loader = DataLoader(
diff --git a/deepspeech/training/trainer.py b/deepspeech/training/trainer.py
index 220914f3f16e7da9fcdbe821dbf9f5367570d2ec..e630febbc7862b037a6b933fb73511831766b7fc 100644
--- a/deepspeech/training/trainer.py
+++ b/deepspeech/training/trainer.py
@@ -264,6 +264,7 @@ class Trainer():
 
     @mp_tools.rank_zero_only
     def destory(self):
+        """Close visualizer to avoid hanging after training"""
         # https://github.com/pytorch/fairseq/issues/2357
         if self.visualizer:
             self.visualizer.close()