[update] README.md

README.md

@@ -18,4 +18,7 @@ Transcription data is `test.jsonl` and `train.jsonl` in the racine folder. The t
 
 ## Data Split
 The data is split into `train` and `test` sets. 
-The `train` set contains 90% of the data and the `test` set contains 10% of the data.
+The `train` set contains 90% of the data and the `test` set contains 10% of the data.
+
+## data augmentation
+We used data augmentation in order to increase the diversity of our training data without actually collecting new data (we have a very small dataset). By applying noise and volume, we can generate some training samples, which are named by "_NOISE" or "_VOLUME" after speakers' names.