Update app.py

app.py

@@ -136,7 +136,6 @@ if __name__ == "__main__":
 
     channels = [1]
     mapping = [c - 1 for c in channels]
-    sample_rate = int(sample_rate)
     interval_size = 10 
     downsample = 1
     block_size = int(sample_rate * interval_size / 1000)