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by rm999 4962 days ago
The first time I saw a paper on feasible deep networks was at NIPS 2006, specifically this paper: http://www.cs.toronto.edu/~hinton/absps/fastnc.pdf

It's been awhile since I read the paper, but as I recall it involved training an unsupervised model layer-by-layer (training a layer, freezing the weights, then training another layer on top of it).