https://github.com/unsky/Deformable-ConvNets-caffe/blob/e0f7abd58e166398d3695871769108f03e547786/deformable_conv_cxx/deformable_im2col.cu#L395 Should be `int num_kernels = height_col * width_col * 2 * kernel_h * kernel_w * deformable_group; `?