Very interesting also is that you can directly send the error to intermediate layers through sparse random projections without the need for any layerwise backp

Very interesting also is that you can directly send the error to intermediate layers through sparse random projections without the need for any layerwise backpropagation. This relaxation of the structure of the backward pass makes bp even more plausible from a biological perspective. https://arxiv.org/abs/1609.01596 https://arxiv.org/abs/1609.01596 https://arxiv.org/abs/1903.02083 https://arxiv.org/abs/1903.02083