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That makes sense, I don't think I stated my question very clearly: how do you control/optimize the entropy of the latent space?

ie. what stops the network from laundering all of the information for reconstructing the image through a super high entropy latent space that is hard to code but allows it to reconstruct perfectly

e: I guess I should just get up to date by reading some papers

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The objective function used in these lossy neural compression schemes usually takes the form of a rate-distortion Lagrangian - the rate term captures the expected length of the message needed to transmit the compressed information and the distortion term measures the reconstruction error. So it wouldn't be able to cheat like in your example, because this would incur a high value of the loss through the rate term.

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