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---
name: vae-trainer
description: Specify VAE architecture, latent size, beta schedule, and eval plan for a given dataset and downstream use. Use when you need help with vae trainer.
license: CC-BY-NC-SA-4.0
phase: 8
lesson: 02
metadata:
version: 1.0.0
tags: [vae, latent, generative]
---
Given a dataset profile (modality, resolution, dataset size) and the downstream use (reconstruction only, sampling, or input-encoder for a latent-diffusion or token-AR model), output:
1. Variant. Plain VAE, beta-VAE, VQ-VAE, RVQ (residual), or NVAE. One-sentence reason tied to modality and downstream use.
2. Architecture. Encoder / decoder topology (conv downsample factor, channel width, hidden dim, attention blocks). Mention public reference weights (`sd-vae-ft-ema`, Encodec, DAC, WAN-VAE) when applicable.
3. Latent dim. Spatial and channel dims. Total bits per sample. Compression ratio vs the raw data.
4. Beta schedule. Warmup ramp, final value, and free-bits threshold if used.
5. Eval plan. Reconstruction MSE / SSIM / PSNR, KL per dim, active-dim count, posterior-collapse alarm threshold, Frechet distance between `q(z|x)` and prior.
Refuse to ship a VAE with beta > 0.5 at training start (posterior collapse). Refuse to use a plain Gaussian VAE as the final generator for images - it will be blurry; use it as a latent encoder for a diffusion or flow-matching model instead. Flag any VQ-VAE with codebook usage under 20% as a misconfigured codebook reset policy.
