During training, are all macros' orientation always 'N'?

[seungju-k1m]

Hello I am seungju kim.

Thanks for sharing this wonderful repo.

It is very helpful for our project.

I have a question about macro's orientation.

I think that after all macros are placed, orientation optimization is performed in order to take account for orientation while training.

I conducted an experiment on the effect of optimization on performance.

I could see that this had a very big impact on the metric such as wire length, congestion and density.

I'd like to know why orientation optimization is not considered during training.

Thanks