How can I improve AP accuracy on my dataset

[blurmemo]

Hi!
I am using solov2 to train my dataset, but the size of the images in my dataset is different from coco dataset. The aspect ratio of the images is 3:4 or 1:1 (I resize the original dimensions and scale to the image scale(height = 1080)). So how can I adjust num_grids and scale_ranges to get better AP. Can you give some suggestions? For example how can I calculate to get num_grids which can make model perform better, whether can I reset scale_ranges value to get better result or not?
Thank you!
@WXinlong