Floating Point 16 ONNX model conversion

[seabass1217]

First off, thank you for such a helpful repo!
I followed the the instructions on https://github.com/WongKinYiu/yolov7 to convert a .pt model to a .onnx model. The model runs fine, it produces the same results as the original .pt model. The problem is the .onnx model is twice the size as the .pt model. I think it's due to different floating point sizes. Any suggestions on converting fp16 .pt model to fp16 .onnx model?

Thanks in advance