fix detect.py (invalid model path)
fix detect.py (invalid model path)

gnina/gnina,wangg12/caffe,tackgeun/caffe,CZCV/s-dilation-caffe,gnina/gnina,wangg12/caffe,wangg12/caffe,wangg12/caffe,tackgeun/caffe,gnina/gnina,CZCV/s-dilation-caffe,CZCV/s-dilation-caffe,gnina/gnina,tackgeun/caffe,gnina/gnina,CZCV/s-dilation-caffe,tackgeun/caffe,gnina/gnina