* Fix subtensor numpy warning

* Fix simple typo: varible->size -> variable->size

Closes #6734

* Counteract hypot redefinition for old Python versions

* fix doc warning

* Update extending_theano.txt

* OrderedDict cannot be imported from collections.abc, it is not abstract

See https://github.com/Theano/Theano/pull/6664#issuecomment-581845517

* Move more collections.abc imports to theano.compat

* Use math.gcd instead of fractions.gcd when possible

fractions.gcd() function has been removed from Python 3.9, it was
deprecated since Python 3.5.

https://docs.python.org/3.9/whatsnew/3.9.html#removed

* DOC: Allow building with Sphinx >= 2.0

* MAINT: Avoid SyntaxWarnings on import in Python 3.8

* flake8 code style fixes

* DOC: Retain compatibility with older Sphinx

* MAINT: Be compatible with numpy 1.17 and scipy 1.3

Fixes #6715.  Includes and supersedes #6721.

* flake8 code style fixes

* Remove doctest in python 3.4

* Do not install sphinx_rtd_theme for python 3.4 as the installation doesn't work anymore.

* fixing typo in GammaIncC Op

* re-add min > max clip test with fixed reference

* DOC: min > max clip may not match numpy

* updating travis build for Python 3

* order of stages

* conda activate

* installing conda properly

* conda install on travis

* conda activate issues on travis

* conda activate issues on travis

* doctest needs older version of numpy

* doctest

* reverting setup.cfg

* conda version conflicts

* need old sphinx version

* sphinx version

* don't bother building docs

* moved nosetester import

* also moving known failures plugin
Co-authored-by: Adrian Seyboldt <adrian.seyboldt@gmail.com>
Co-authored-by: Frédéric Bastien <frederic.bastien@gmail.com>
Co-authored-by: Tim Gates <tim.gates@iress.com>
Co-authored-by: Marcel Bargull <marcel.bargull@udo.edu>
Co-authored-by: Arnaud Bergeron <abergeron@gmail.com>
Co-authored-by: Miro Hrončok <miro@hroncok.cz>
Co-authored-by: Rebecca N. Palmer <rebecca_palmer@zoho.com>
Co-authored-by: Frederic Bastien <fbastien@nvidia.com>