Demystifying Variational Diffusion Models
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A generative model is a simulation of a data-generating process. Understanding the true generative process of data is valuable as it naturally reveals causal relationships. These causal relationships are advantageous as they tend to generalize more effectively to new situations than mere correlations, which may be spurious and unreliable. Although various generative modelling strategies exist, diffusion models have emerged as the latest dominant paradigm. Gaining a deeper understanding of the model class remains an elusive endeavour, particularly for the uninitiated in non-equilibrium statisti...
A generative model is a simulation of a data-generating process. Understanding the true generative process of data is valuable as it naturally reveals causal relationships. These causal relationships are advantageous as they tend to generalize more effectively to new situations than mere correlations, which may be spurious and unreliable. Although various generative modelling strategies exist, diffusion models have emerged as the latest dominant paradigm. Gaining a deeper understanding of the model class remains an elusive endeavour, particularly for the uninitiated in non-equilibrium statistical physics. Thanks to the rapid rate of progress in the field, existing work on diffusion models focuses on either applications or theoretical contributions. Unfortunately, the theoretical material is often inaccessible to practitioners and new researchers, leading to a risk of superficial understanding in ongoing research. Given that diffusion models are now an indispensable tool, a clear and consolidating perspective on the model class is needed to properly contextualize recent advances in generative modelling and lower the barrier to entry for new researchers. That is what this monograph focuses on. In this text, predecessors to diffusion models are revisited, such as hierarchical latent variable models, and a holistic perspective using only directed graphical modelling and variational inference principles is synthesized. The resulting narrative is easier to follow, as it imposes fewer prerequisites on the average reader relative to the view from non-equilibrium thermodynamics or stochastic differential equations.
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