Relative Entropy Coding for Learned Data Compression

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• Greg Flamich, Engineering Department (Cambridge)
• Tuesday 23 May 2023, 13:00-14:00
• Lecture Theatre 2.

If you have a question about this talk, please contact Mateja Jamnik.

In recent years, machine learning (ML) ignited a revolution in data compression as researchers and engineers can now design codecs that learn how to encode information optimally from large datasets. These ML-based methods use deep generative models (DGM), such as variational autoencoders or diffusion models, to build a distribution over the data. DGMs generate data by simulating a sample from a simple latent distribution, such as a Gaussian, which they transform into a sample from the data distribution using a deep neural network. Hence, we can encode data by encoding the latent sample that generated it and using the DGM to reconstruct it. However, a surprising fact is that traditional methods for encoding the latent sample are suboptimal, and a far more efficient approach exists called relative entropy coding (REC).

In this talk, I will first give an overview of learned data compression and some issues it faces and use it to motivate REC . Then, I will present a simple REC algorithm, revealing a surprising equivalence between sampling and search. Finally, I will discuss the main limitations of current REC algorithms, which prevent their practical application so far and lay out some potential ways to resolve these limitations.

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This talk is part of the Artificial Intelligence Research Group Talks (Computer Laboratory) series.

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