[GitHub] aaronmarkham opened a new pull request #12195: [MXNet-744] Fix website build pipeline Python 3 issues

[GitBox <gi...@apache.org>]

aaronmarkham opened a new pull request #12195: [MXNet-744] Fix website build pipeline Python 3 issues
URL: https://github.com/apache/incubator-mxnet/pull/12195
 
 
   ## Description ##
   Some Python 3 incompatibilities existed in the website build pipeline. When CI was updated to run docs build in Python 3 mode these surfaced. This PR addresses it and locks in the Python dependency versions to help prevent future breakage.
   
   ## Checklist ##
   ### Essentials ###
   Please feel free to remove inapplicable items for your PR.
   - [x] The PR title starts with [MXNET-$JIRA_ID], where $JIRA_ID refers to the relevant [JIRA issue](https://issues.apache.org/jira/projects/MXNET/issues) created (except PRs with tiny changes)
   - [x] Changes are complete (i.e. I finished coding on this PR)
   - [x] To the my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change
   
   ### Changes ###
   * Fixed Sphinx plugin mxdoc.py Python 3 issues by using `six`.
   * Added `six` to dependencies
   * Consolidated Python requirements for docs to one file in `ci/docker/install`
   * Pinned dependencies to specific version numbers
   * `mock` was not pinned upstream from docs, so we were getting a later version than what docs had been pinned to, so this is upgraded.
   * "Upgraded" a variety of packages that were not pinned to the latest in PyPI. Tests indicate things are good, and I'd rather pin things now to prevent future breakage.
   * Added a separate `Jenkinsfile-dev` so I don't have to keep hacking the Jenkinsfile every time I need to test something from my fork. This way I can just point to it from the test Jenkins jobs directly, and no more code updates. 
   * Updated CI's docker images to use the new Python requirements file
   
   ## Comments ##
   * We can break out a separate requirements file if some split in deps appears between Python 2/3. For now the packages are the same.
   

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