diff --git a/README.md b/README.md
index 0285841..8eead77 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,7 @@ import towhee
 (
     towhee.glob('test.wav')
           .audio_decode.ffmpeg()
+          .runas_op(func=lambda x:[y[0] for y in x])
           .audio_embedding.vggish()
           .show()
 )
@@ -40,6 +41,7 @@ import towhee
 (
     towhee.glob['path']('test.wav')
           .audio_decode.ffmpeg['path', 'frames']()
+          .runas_op['frames', 'frames'](func=lambda x:[y[0] for y in x])
           .audio_embedding.vggish['frames', 'vecs']()
           .show()
 )
diff --git a/vggish.py b/vggish.py
index 9b8a054..c68775c 100644
--- a/vggish.py
+++ b/vggish.py
@@ -71,14 +71,3 @@ class Vggish(NNOperator):
             log.error("Fail to load audio data.")
             raise e
 
-
-# if __name__ == '__main__':
-#     encoder = Vggish()
-#
-#     # audio_path = '/path/to/audio'
-#     # vec = encoder(audio_path)
-#
-#     audio_data = numpy.zeros((2, 441344))
-#     sample_rate = 44100
-#     vec = encoder(audio_data, sample_rate)
-#     print(vec)