PointNetGPD: Problem with kinect2grasp.py

@lianghongzhuo Firstly thank you for your great paper and code! When I tried to run kinect2grasp.py, I noticed that there is no defination of table_top. So I fixed the value of cam_top and used the pointcloud of kinect2 directly to let the procedure continue. However, I encountered an error just in front of the network, which is

Caculated padded input size per channel: (0). Kernel size :(1). Kernel size can't be greater than actual input size

The log showed that several graps were actually sent into the network. May you help me figure out the reason why the error occurred? Thanks in advance.