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* Update gatedgraphconv.py

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* line

* two lines

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* update

* Implement LINE

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Co-authored-by: Zihao Ye <expye@outlook.com>
Co-authored-by: xiang song(charlie.song) <classicxsong@gmail.com>
Co-authored-by: Jinjing Zhou <VoVAllen@users.noreply.github.com>