"Google researcher Sujith Ravi came up with a novel idea: co-train two neural networks. One network is a full neural network, called the trainer network. The other network, called projection network, is a network that tries to represent the input and intermediate representations of the trainer network in a low-memory representation. To do this it uses efficient functions. Both networks are trained at the same time and share the same loss function. In this way the projection network learns from the trainer network. When both neural networks are ready to be used, the large network can remain on the server while users can download the small efficient network on their smartphone."
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