[Relay][Pass]Do we want to allow LetNode in FoldScaleAxis pass?

Great! Thanks, @kevinthesun Is there any regular test to track this unit test status?

I delete the other test and keep test_forward_ssd() only. Then I run the unit test in this way

python test_forward.py

It fails with the error message in the frontend:

TypeError: batch_norm() got an unexpected keyword argument 'exponential_avg_factor'