Yee

hi, how to convert stn to onnx? when i convert stn to onnx, there is a error: `RuntimeError: Exporting the operator affine_grid_generator to ONNX opset version 9 is not supported.`

> 我试了是可以的。 @duorouputao 你好，请问双层车牌该如何处理，需要修改代码吗

why multiply by 4? hope to answer my doubts，thanks!

You need to modify the shape of `cls_preds` , `box_preds` , `dir_cls_preds` according to the your grid size and number of categories, in the `simplify_postprocess()` func.