One open question is where well-known implementations of Project API servers 
should live. I see a couple of options:

O1. Place them in the tvm repo, probably under `apps/microtvm` as is roughly 
done in [PR 7653](https://github.com/apache/tvm/pull/7653) (Project API not 
implemented there, but the code is moved where it would go).

O2. Create separate repositories for implementations.

I see a couple of benefits to putting implementations in the TVM repo:
- It's easier to discover them
- It's easier to keep them updated in case we make purposeful or accidental 
breaking changes
- Documentation can be consolidated with the TVM docs

But I see these drawbacks:
- We need to include unit/integration tests in the TVM CI. It may not always be 
possible to do this e.g. if a hardware-in-the-loop solution is required.
- The TVM docs are really hard to update :( (we are working on this....but 
that's the state of the world today).

It seems like essentially each implementation could choose.
- If they are able to provide sufficient test coverage in pure software (e.g. 
with QEMU or another emulator), I think we could definitely allow 
implementations to be checked-in to `apps/microtvm`.
- We could consider a second tier for e.g. those that can't provide CI 
coverage: `apps/microtvm/no-ci`
- Finally, if the TVM development process is too burdensome, implementations 
could go in other e.g. GH repos, provide a README.md, and be linked from 
microTVM docs page. 
    - I don't think we can offer CI coverage for these--it's too hard to report 
results without e.g. a pinned submodule in TVM
    - I don't see why someone would maintain a TVM submodule rather than check 
in code directly (I could see a use case where these implementations have a 
stable and dev branch, but this seems a bit forward-looking right now).

Thoughts? I'm inclined to proceed with this framework if no one objects.





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