Supplemental Material: Differentiable hierarchical and surrogate gradient search for spiking neural networks

Figure 1: Mixed operation at the input of membrane potential. Same as most NAS structures, we adopt stem layer as our first layer to extract features. Then we employ cell structure as our basic unit to construct our whole searching structure. The stem layer takes 3-channel images as input and outputs 48-channel spiking feature maps. For the rest of the network, we employ 6 normal cells and 2 reduction cells.