[RunONNXModel.py] Add options to print out input/output signatures and support big models

[tungld]

This patch improves RunONNXModel.py script with the following changes:

• Add two options --print-input-signature and --print-output-signature to print out signatures.
• Support big models that are compiled into two output files: model.so and model.constants.bin

[AlexandreEichenberger]

LGTM

Thanks, that is super useful. Is there a need to distinguish between input and output? I would have imagined that a common --print-signatures would have been enough. That way, it would also reduce the increasingly long list of options.

Also, a small pet peeve: the old -save-so accepted a directory, and would automatically "name" the .so; but the -load-so needed an explicit so file. Ideally, the behavior should be identical for both save and load, with my preference going to being able to name a directory in both cases. If the final behavior could be explicit in the "help" that would be good.

[tungld]

I would have imagined that a common --print-signatures would have been enough

I merged two options into a single one --print-signatures. Thanks!

Ideally, the behavior should be identical for both save and load, with my preference going to being able to name a directory in both cases. If the final behavior could be explicit in the "help" that would be good.

Yes, both new --save-model and --load-model accept a folder only.

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