[onnx] model initialized without pretrained checkpoint

[hilaryliang]

thank you for your great job!

thank you for providing the toolbox.py for export onnx and coreml, however, i want to export my own segmentation model.

python toolbox.py --model efficientformerv2_s0 --ckpt segmentation/work_dir/iter_800001.pth

how can i initialize with my own trained model?