Build doctest to test python docstrings

[WindQAQ]

Seems that core TF has already used doctest to test python docstring, which having different style with ours, especially for code snippet example usage. To unify the docstring and for better documentation, the doctest should be also built in addons.

See https://www.tensorflow.org/community/contribute/docs_ref for more details.

[WindQAQ]

For anyone who what to work on this, these files in core TensorFlow might be helpful.

https://github.com/tensorflow/tensorflow/blob/master/tensorflow/tools/docs/tf_doctest.py
https://github.com/tensorflow/tensorflow/blob/master/tensorflow/tools/docs/BUILD#L13

[bryanko1]

I am interested in helping out with this. Do you have any advice for me on where to start? Thanks!

[seanpmorgan]

Hi @bryanko1! Welcome to addons. There is already a PR for this:
#677

Would you mind giving it a review?

[bryanko1]

Yeah, sure thing!

[yil532]

Hello friend, I see this issue is not closed yet, do we still need some help here? @seanpmorgan