diff --git a/cosyvoice/utils/file_utils.py b/cosyvoice/utils/file_utils.py
index 7700a9f..d4179e1 100644
--- a/cosyvoice/utils/file_utils.py
+++ b/cosyvoice/utils/file_utils.py
@@ -40,14 +40,14 @@ def load_wav(wav, target_sr):
         speech = torchaudio.transforms.Resample(orig_freq=sample_rate, new_freq=target_sr)(speech)
     return speech
 
-def speed_change(waveform,sample_rate,speed_factor:str):
+def speed_change(waveform, sample_rate, speed_factor: str):
     effects = [
-    ["tempo",speed_factor],  # speed_factor
-    ["rate", f"{sample_rate}"]  
+        ["tempo", speed_factor],  # speed_factor
+        ["rate", f"{sample_rate}"]
     ]
     augmented_waveform, new_sample_rate = torchaudio.sox_effects.apply_effects_tensor(
-        waveform, 
-        sample_rate, 
+        waveform,
+        sample_rate,
         effects
     )
     return augmented_waveform, new_sample_rate