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Holographic Feature Representations of Deep Networks
Proceedings of the 33rd Conference on Uncertainty in Artificial Intelligence, PMLR R15:401-410, 2017.
Abstract
It is often asserted that deep networks learn “features”, traditionally expressed by the ac- tivations of intermediate nodes. We explore an alternative concept by defining features as partial derivatives of model output with re- spect to model parameters—extending a sim- ple yet powerful idea from generalized linear models. The resulting features are not equiva- lent to node activations, and we show that they can induce a holographic representation of the complete model: the network’s output on given data can be exactly replicated by a simple lin- ear model over such features extracted from any ordered cut. We demonstrate useful advan- tages for this feature representation over stan- dard representations based on node activations.