Before revision:  Extensive experiments show that our newly-proposed model achieves new state-of-the-art results on popular benchmarks. To our best knowledge, it is the first work on code summarization that uses Transformer to model structural information with high efficiency and no extra parameters. We also provide a tutorial on how we pre-process .
After revision:  Extensive experiments show that our newly-proposed model achieves new state-of-the-art results on benchmarks .