Added CPU Optical Flow

Howard Stark

2018-02-19 892860e84e161457745ec0130f31c4313451b819

 src/network_kernels.cu

@@ -114,6 +114,7 @@
    state.truth = *net.truth_gpu;
    state.train = 1;
    forward_network_gpu(net, state);
   cudaStreamSynchronize(get_cuda_stream());
    backward_network_gpu(net, state);
}