What's the input and the output of nni?

[xuehui1991]

What would you like to be added:
For now, some user may confuse what's the input and the output of nni.
Such as NAS, shall we format one output format(output model? config? ) so that user won't confuse.

Why is this needed:

Without this feature, how does current nni work：

Components that may involve changes:

Brief description of your proposal if any:

[ultmaster]

Let's discuss it case by case.

For NAS, the derivation of final architecture is what is needed. For most algorithms, this post-processing might not be easy. So yes. I agree that an API should be designed to obtain the final model for user.