Weight Banding
Open up any ImageNet conv net and look at the weights in the last layer. You’ll find a uniform spatial pattern to them, dramatically unlike anything we see elsewhere in the network. No individual weight is unusual, but the uniformity is so striking that when we first discovered it we thought it must be a bug. Just as different biological tissue types jump out as distinct under a microscope, the weights in this final layer jump out as distinct when visualized with NMF. We call this phenomenon weight banding.
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