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Importance of Cross-Layer Cooperation for Learning Deep Feature Hierarchies AbstractA common property of hierarchical models of the brain is their capacity to integrate bottom-up and top-down information in order to distill the task-relevant information from the sensory noise. In this paper, we argue that such cooperation between upper and lower layers is not only useful at prediction time but also at learning time in order to build a successful feature hierarchy. The claim is corroborated by training a set of deep networks on real data and measuring the evolution of the representation layer after layer. The analysis reveals that cross-layer cooperation enables the emergence of a sequence of increasingly invariant representations.
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