= Weight transport problem
Exact <backpropagation> computes hidden teaching signals using the transpose of the current forward weight matrix. Explaining how a biological feedback pathway could know or maintain those weights is the <weight transport problem>. Useful approximate error correction need not satisfy exact reciprocal weight equality.<Random synaptic feedback weights support error backpropagation for deep learning by Timothy P. Lillicrap and others>[Results, Figure 1 and Figure 2; Discussion: random feedback, learning performance and biological limitations]{ref}
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