how to inference with my own trained model not "demo.py"

[Ashinhuang]

Dear,
how to use my own model for inference, not the "demo.py":

I try this, but it is wrong:
python train.py --config-file ../configs/COCO-InstanceSegmentation/mask_rcnn_R_50_FPN_3x.yaml
--input input1.jpg --output outpath.png --opts MODEL.WEIGHTS my_model_final.pth

can you tell me the command about how to inference with my own trained model?
Thanks