How do ops under ML namespace enter the score calculation?

[yuanyao-nv]

I see there have been new tests added for ops under the ml namespace, see this PR onnx/onnx#4881.

The current scoreboard setup will automatically pick up all tests under the backend/test/case/node directory. Since most backend providers don't support the ml ops, should such tests be excluded from the scoreboard? eg. by specifying -k "not test_ai_onnx_ml_".

[cbourjau]

As a user of the ML opset I'd love to see them included :)