Use type hinting in source code

[ducalpha]

Python 3's Type Hints seem very helpful for reading the source code and it is used in projects like AllenNLP and Flair. Do you plan to use it in the development of StanfordNLP?

[yuhaozhang]

Thanks a lot for the suggestion! This is an interesting point and we'll discuss this for future releases.

[stale[bot]]

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