Description

CI and website builds are down due to an incompatibility in versions of Sphinx and one of its extensions, autodocsumm. This extension is used in the Python API docs (fairly important feature).

Also, reported here on the autodocsumm project as of yesterday.
Chilipp/autodocsumm#22

I already have a proposed fix coming...

Error Message

http://jenkins.mxnet-ci.amazon-ml.com/blue/organizations/jenkins/mxnet-validation%2Fwebsite/detail/PR-17489/4/pipeline/

[2020-02-10T21:06:01.468Z] Extension error:
[2020-02-10T21:06:01.468Z] Could not import extension autodocsumm (exception: cannot import name 'Signature' from 'sphinx.ext.autodoc' (unknown location))

To Reproduce

Just build python docs.