Hi authors, it's a nice work. I follow the instruction and correct setup the pytorch code. But when i import att_grid_generator_cuda, problem occurred. "ImportError: anaconda3/lib/python3.6/site-packages/att_grid_generator-0.0.0-py3.6-linux-x86_64.egg/att_grid_generator_cuda.cpython-36m-x86_64-linux-gnu.so: undefined symbol: _ZN3c1011CPUTensorIdEv" Can you help me fix this problem? Thanks.