Issue title: 您好请问您这个对应的论文是那一篇。
 Issue body: 您好请问您这个对应的论文是那一篇。
 Comments: 
 Comment 0: https://github.com/CyberZHG/keras-self-attention/blob/c66034d2554ff63033caf614a5dea2e57c5612dd/keras_self_attention/seq_self_attention.py#L29
 Comment 1: This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.
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