What a nice coincidence, I'm also looking on object detection for an alternative. Could found two answer then, nice.

I've done some project on plant leaf classification on android and surprisingly it works fine without straining even an old phone (using mobilenetv3) and I've also heard about computation problem before regarding deep learning especially on android quite frequent. But nice idea though could actually be an alternative for my problem. Will definetily look further on it.

I've seen alot of post that says the only model that support instance segmentation for android is Mask R-CNN, never check on semantic but maybe there's a point there to take. btw thanks, will check em