fix(setup.py): enforce Snorkel is before v0.9.7

[nicholaschiang]

Snorkel v0.9.7 introduced some breaking dependency changes that this HACK repository isn't compatible with:

ERROR: snorkel 0.9.7 has requirement numpy<1.20.0,>=1.16.5, but you'll have numpy 1.20.1 which is incompatible.
ERROR: snorkel 0.9.7 has requirement pandas<2.0.0,>=1.0.0, but you'll have pandas 0.25.3 which is incompatible.

See: https://github.com/snorkel-team/snorkel/releases/tag/v0.9.7

[lukehsiao]

Should we hold snorkel back, or just go to snorkel 0.9.7 and update numpy and pandas in setup.py?

[nicholaschiang]

If you update numpy and pandas, doesn't that mean you should re-run everything to make sure it still works? IMO it's safer just to use the old versions unless it really matters.

[nicholaschiang]

Updating pandas would mean a major version change from pandas<0.26.0,>=0.25.0 to pandas<2.0.0,>=1.0.0 as required by Snorkel v0.9.7.

[lukehsiao]

IMO it's safer just to use the old versions unless it really matters.

Hard to argue with that. I can confirm I'm not seeing any errors with a fresh Python3 venv on 20.04. Did you test it as well?

(Maybe I'll try and get some GitHub Actions hooked up to run make dev at least).

[nicholaschiang]

Yup, I tested and it works fine with this constraint.

[nicholaschiang]

And yeah, a CRON job on GitHub actions every couple of weeks just to ensure that the deps don't break will probs be good (seeing how flaky pip can be).

[lukehsiao]

I'm investigating switching from pip to poetry so we have a real lockfile in #67. I'm re-running some stuff first, but I expect the switch shouldn't cause any issues.