fix specaug; add data static

examples/aishell/s0/README.md

 # Aishell-1
 
+## Data
+| Data Subset | Duration in Seconds |
+| data/manifest.train |  1.23 ~ 14.53125 |
+| data/manifest.dev | 1.645 ~ 12.533 |  
+| data/manifest.test | 1.859125 ~ 14.6999375 |
+
+`jq '.feat_shape[0]' data/manifest.train | sort -un`
+
 ## Deepspeech2
 
 | Model | Params | Release | Config | Test set | Loss | CER |  
 | --- | --- | --- | --- | --- | --- | --- |  
-| DeepSpeech2 | 58.4M | 2.2.0 | conf/deepspeech2.yaml + spec aug + new datapipe | test | 6.396368026733398 | 0.068382,0.073507 |  
+| DeepSpeech2 | 58.4M | 2.2.0 | conf/deepspeech2.yaml + spec aug + new datapipe | test | 6.396368026733398 | 0.068382 |  
 | DeepSpeech2 | 58.4M | 2.1.0 | conf/deepspeech2.yaml + spec aug | test | 7.483316898345947 | 0.077860 |  
 | DeepSpeech2 | 58.4M | 2.1.0 | conf/deepspeech2.yaml | test | 7.299022197723389 | 0.078671 |
 | DeepSpeech2 | 58.4M | 2.0.0 | conf/deepspeech2.yaml | test | - | 0.078977 |  

examples/aishell/s0/conf/augmentation.json

@@ -19,17 +19,17 @@
   {
     "type": "specaug",
     "params": {
-      "W": 5,
+      "W": 0,
       "warp_mode": "PIL",
-      "F": 30,
+      "F": 10,
       "n_freq_masks": 2,
-      "T": 40,
+      "T": 50,
       "n_time_masks": 2,
       "p": 1.0,
       "adaptive_number_ratio": 0,
       "adaptive_size_ratio": 0,
       "max_n_time_masks": 20,
-      "replace_with_zero": false
+      "replace_with_zero": true 
     },
     "prob": 1.0
   }