About evaluating FID score on 512*512 image size

I have trained a 512*512 version MAR and meet some difficulties when evaluting the model.
According to this piece of code:

<img width="429" alt="Image" src="https://github.com/user-attachments/assets/fabf6c08-976f-47fd-89cb-e6250fcd8704" />

The evaluation will use the fid_statistics_file of 256 img_size provided in the repo. 
How to get a 512 fid_statistics_file?
