fix error

app.py

@@ -4,10 +4,10 @@ import os
 import gradio as gr
 import nltk
 
-os.system("python -m unidic download")
+# os.system("python -m unidic download")
 from melo.api import TTS  # noqa: E402
 
-nltk.download("averaged_perceptron_tagger_eng")
+# nltk.download("averaged_perceptron_tagger_eng")
 
 # Get device
 device = "auto"
@@ -18,9 +18,9 @@ speaker_ids = model.hps.data.spk2id
 def inference(
         text: str, speed: float, speaker: str, progress=gr.Progress(track_tqdm=True)
 ):
-    bio = io.BytesIO()
-    model.tts_to_file(text, speaker_ids[speaker], bio, speed=speed)
-    return bio
+    out_path = "audio.wav"
+    model.tts_to_file(text, speaker_ids[speaker], out_path, speed=speed, format='wav')
+    return out_path
 
 
 if __name__ == "__main__":