How to perform inference on detectron2 instance segmentation model trained on custom dataset ?

[neerajgk]

i have the model_final.pth file and i want to run inference on set of images
cfg = get_cfg()
cfg.merge_from_file(model_zoo.get_config_file("Misc/cascade_mask_rcnn_R_50_FPN_3x.yaml"))
cfg.MODEL.WEIGHTS = "model_final.pth"

i am able to run inference but model is not predicting.
please help