Binary export/import

[ntjohnson1]

Marking as draft since I need to set up some more perf comparisons but local ones looked good in initial exploration.
Also want to check this on the MATLAB side to see how annoying it is to export to a similar format or open this dump in MATLAB.
Closes #466

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📚 Documentation preview 📚: https://pyttb--467.org.readthedocs.build/en/467/

[ntjohnson1]

@gqcollins would be curious to see if this helps your use case. AFAICT both of these binary approaches don't use pickle so should be more generally compatible across systems/versions.

[gqcollins]

I'll try it next week and get back to you. Thanks!

[gqcollins]

The binary code does help my use case quite a bit. As I mentioned before, the exports I'm doing take ~80s with the .txt format (using the improved numpy version) and imports take ~20s. The numpy binary version takes ~1.9s for exports and ~3.3s for imports. The .mat version takes ~2.5s for exports and ~1.6s for imports. And I can easily port these files to other systems.

You'll have to decide whether it's worth adding these (or at least one of them) to the repo or not. In any case, I appreciate you offering me the code!

[ntjohnson1]

Great! I'm glad it helped. I think the primary difference you're seeing in time is that mat defaults to compression where numpy doesn't.

I'm pretty confident we'll add one, both, or an alternative. But it might not land for a little bit, I probably need to touch base with Danny. I still need to check how easy it is to interop with the MATLAB ttb.