[demo] support English

app.py

@@ -20,7 +20,7 @@ import librosa
 
 wenet.set_log_level(2)
 # decoder_cn = wenet.Decoder(lang='chs')
-# decoder_en = wenet.Decoder(lang='en')
+decoder_en = wenet.Decoder(lang='en')
 
 
 def recognition(audio, lang='CN'):
@@ -30,10 +30,8 @@ def recognition(audio, lang='CN'):
     # NOTE: model supports 16k sample_rate
     y = (y * (1 << 15)).astype("int16")
     if lang == 'CN':
-        decoder_cn = wenet.Decoder(lang='chs')
-        ans = decoder_cn.decode(y.tobytes(), True)
+        ans = decoder_en.decode(y.tobytes(), True)
     elif lang == 'EN':
-        decoder_en = wenet.Decoder(lang='en')
         ans = decoder_en.decode(y.tobytes(), True)
     else:
         return "ERROR! Please select a language!"