Autoencoders and Diffusers: A Brief Comparison

Eugene Yan · 3 years ago · 7

The article compares autoencoders and diffusion models, explaining how both learn to map data onto lower-dimensional manifolds through similar training paradigms involving input reconstruction. Both architectures use bottleneck layers and learn from corrupted inputs, with denoising autoencoders explicitly adding noise to train reconstruction. The key difference is that diffusion models condition on timesteps as input, allowing a single model with fixed parameters to handle varying noise levels and enable text-conditioned image generation, whereas autoencoders map inputs to fixed representations or distributions.