diff --git a/README_cn.md b/README_cn.md
index 29aadbdf639b529ce049f8244acdba7394a2e3de..4b92736252ef7249e204cecc4ed80349a7316299 100644
--- a/README_cn.md
+++ b/README_cn.md
@@ -16,7 +16,7 @@
 
 ## 安装
 
-在以下环境测试验证过：    
+在以下环境测试验证过：  
 
 * Ubuntu 16.04
 * python>=3.7
diff --git a/deepspeech/exps/u2_kaldi/model.py b/deepspeech/exps/u2_kaldi/model.py
index a2f062a18ed4d07074d76663631df9a1d72c958d..60f070a3b32e7252646d54450f490790eed71eb3 100644
--- a/deepspeech/exps/u2_kaldi/model.py
+++ b/deepspeech/exps/u2_kaldi/model.py
@@ -233,7 +233,7 @@ class U2Trainer(Trainer):
             batch_frames_inout=0,
             preprocess_conf=config.collator.augmentation_config,
             n_iter_processes=config.collator.num_workers,
-            subsampling_factor=0,
+            subsampling_factor=1,
             num_encs=1)
 
         self.valid_loader = BatchDataLoader(
diff --git a/deepspeech/frontend/augmentor/spec_augment.py b/deepspeech/frontend/augmentor/spec_augment.py
index ed593da4ad1dfff5ac0547152f693e2744a449f4..bfa8300af1576cc6c89bb2e3353e6706633ac02a 100644
--- a/deepspeech/frontend/augmentor/spec_augment.py
+++ b/deepspeech/frontend/augmentor/spec_augment.py
@@ -64,7 +64,6 @@ class SpecAugmentor(AugmentorBase):
         self.n_freq_masks = n_freq_masks
         self.n_time_masks = n_time_masks
         self.p = p
-        
 
         # adaptive SpecAugment
         self.adaptive_number_ratio = adaptive_number_ratio
@@ -120,7 +119,7 @@ class SpecAugmentor(AugmentorBase):
     @property
     def time_mask(self):
         return self._time_mask
-    
+
     def __repr__(self):
         return f"specaug: F-{F}, T-{T}, F-n-{n_freq_masks}, T-n-{n_time_masks}"