unlimited epochs, misc fixes

[casperdcl]

• unlimited epochs (fixes Use infinite loop instead of set number of epochs #13)
• fix & update README
• minor potential data download fix
• ignore /data
• lint (black + isort)

P.S. is there an easy way to propagate the relevant subset of this PR to other branches? The history looks like a mess. Would you like me to rebase & tidy the other branches in a follow-up issue? Long-term of course should be generated by https://github.com/iterative/example-repos-dev

[dberenbaum]

Thanks, @casperdcl! All the formatting and copy edits look great!

I think using dvclive.get_step() with an infinite number of epochs seems kind of pointless, though, unless I'm missing something. I think we can either leave that out or stick with a finite number of epochs and fix it to match the expected resume functionality. The finite epochs seems useful since it's a more complex workflow, although it's hard to reproduce it in the other branch workflows. Maybe we can show finite epochs and note how dvclive makes it easy to coordinate with the epoch number in code?

P.S. is there an easy way to propagate the relevant subset of this PR to other branches? The history looks like a mess. Would you like me to rebase & tidy the other branches in a follow-up issue? Long-term of course should be generated by https://github.com/iterative/example-repos-dev

Yeah, this is a bit of a mess for now. I don't know an easy way to propagate to other branches, but feel free to

[dberenbaum]

Oh, I just saw your suggestion with a branch for a fixed number of epochs. Nice idea. In that case, maybe we should drop dvclive.get_step() in this branch?