diff --git a/deepspeech/training/gradclip.py b/deepspeech/training/gradclip.py
index 912861f64d96dd5edcdb72184587a7fb30016ad8..d0f9803d2664f697e58ea4ed2087d5c44526e1f9 100644
--- a/deepspeech/training/gradclip.py
+++ b/deepspeech/training/gradclip.py
@@ -46,7 +46,8 @@ class ClipGradByGlobalNormWithLog(paddle.nn.ClipGradByGlobalNorm):
 
             # debug log
             if i < 10:
-                logger.debug(f"Grad Before Clip: {p.name}: {float(sum_square.sqrt()) }")
+                logger.debug(
+                    f"Grad Before Clip: {p.name}: {float(sum_square.sqrt()) }")
 
         # all parameters have been filterd out
         if len(sum_square_list) == 0:
diff --git a/examples/aishell/s0/README.md b/examples/aishell/s0/README.md
index 6d67d19a90c16d0f274e27f45387cc668320d6b1..fd4cf6a7f86da0f2c705d5bd18300c1ea99aeb3a 100644
--- a/examples/aishell/s0/README.md
+++ b/examples/aishell/s0/README.md
@@ -1,7 +1,8 @@
 # Aishell-1
 
 ## CTC
-| Model | Config | Test set |  CER |
-| --- | --- | --- | --- |
-| DeepSpeech2 | conf/deepspeech2.yaml | test | 0.078977 |
-| DeepSpeech2 | release 1.8.5 | test | 0.080447 |
+| Model | release | Config | Test set |  CER |
+| --- | --- | --- | --- | --- |
+| DeepSpeech2 | 2.1 | conf/deepspeech2.yaml | test | 0.080428 |
+| DeepSpeech2 | 2.0 | conf/deepspeech2.yaml | test | 0.078977 |
+| DeepSpeech2 | 1.8.5 | - | test | 0.080447 |
diff --git a/examples/aishell/s0/conf/augmentation.json b/examples/aishell/s0/conf/augmentation.json
index a1a759e67f3a118b6754a60aead069742ede6ecc..5635d9c84c48938f746dcdffd1a16eff9ac8b98c 100644
--- a/examples/aishell/s0/conf/augmentation.json
+++ b/examples/aishell/s0/conf/augmentation.json
@@ -1,4 +1,13 @@
 [
+  {
+    "type": "speed",
+    "params": {
+      "min_speed_rate": 0.9,
+      "max_speed_rate": 1.1,
+      "num_rates": 3
+    },
+    "prob": 0.0
+  },
   {
     "type": "shift",
     "params": {
diff --git a/examples/tiny/s1/conf/augmentation.json b/examples/tiny/s1/conf/augmentation.json
index c1078393d2f2f57fbcb3b48ce0975c2612c39dcb..1987ad4245dcf5542f1e22a545c36899659acef9 100644
--- a/examples/tiny/s1/conf/augmentation.json
+++ b/examples/tiny/s1/conf/augmentation.json
@@ -1,12 +1,4 @@
 [
-  {
-    "type": "shift",
-    "params": {
-      "min_shift_ms": -5,
-      "max_shift_ms": 5
-    },
-    "prob": 1.0
-  },
   {
     "type": "speed",
     "params": {
@@ -16,6 +8,14 @@
     },
     "prob": 0.0
   },
+  {
+    "type": "shift",
+    "params": {
+      "min_shift_ms": -5,
+      "max_shift_ms": 5
+    },
+    "prob": 1.0
+  },
   {
     "type": "specaug",
     "params": {