Use OpenVINO from pip

[dkurt]

• Install OpenVINO by pip
• Update OpenVINO to latest 2021.3 version
• Use enum34==1.1.8 to fix "AttributeError: module 'enum' has no attribute 'IntFlag'" (enum34 tripping up Python 3.7.3 python-poetry/poetry#1122 (comment))

test run: https://github.com/dkurt/deepvariant/actions/runs/755874669

[pichuan]

Thanks @dkurt !
I'll take a look next week and make sure I can incorporate the changes internally.
Can you confirm again that you're ok with us doing that? (I'll add a pointer to this PR when I make the internal change, so that the commit log will have the information.

Thanks.

[dkurt]

@pichuan, Sure, I don't mind if you just copy the changes. Yes, this way is valid because OpenVINO from pip uses manylinux toolchain so it's compatible with Ubuntu 16.04 and allows to upgrade to newer versions.

[pichuan]

@dkurt FYI: This is now the merged internally and will come out in the next release.
Thanks!

[pichuan]

@dkurt Question for you: I'm working an updates to update to Ubuntu20.04, TF2.5, Python3.8, etc.
Want to check in with you on whether we need to update any OpenVINO version before the next release.
Let me know! If it's easier through email, please email me at pichuan@google.com. Thanks!

[dkurt]

Hi, @pichuan! OpenVINO 2021.3 is the latest version. 2021.4 will be released only at least in next month so it's OK to use 2021.3. Thanks!

[pichuan]

Thanks @dkurt ! 2021.3 sounds good. I won't make any changes now.

[pichuan]

@dkurt One more question - I'm comparing runtime on TF 2.5 and I have another question for you. Can you send me an email at at pichuan@google.com and we can discuss in more details? (I don't have your email address :))