add Nebula

gaoisbest · Nov 1, 2020 · e6f71d4 · e6f71d4
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 # Tools
 - [Protege](https://protege.stanford.edu): edit ontology by hand, visualization, and reasoning
 - [DeepDive](http://deepdive.stanford.edu/): relation extraction, [tutorial](http://www.openkg.cn/tool/cn-deepdive)
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+# Graph database
+- [Nebula](https://nebula-graph.io/), used by MeiTuan
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 # Application
 - Question answering
   - How to convert natural language to query language ?