SPIN Unprocessed July 8, 2026 ai_technology research
$\mathbf{\lambda}$-VAE: Variance Equalization for Posterior Collapse
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arXiv:2607.05531v1 Announce Type: new Abstract: Variational Autoencoders (VAEs) frequently suffer from posterior collapse, a failure mode in which the approximate posterior converges to the prior, rendering the latent code uninformative. Despite extensive research, a unified account of why collapse occurs has remained an open question. We identify and formalize two logically independent but coupled causes. \emph{Gradient imbalance} occurs when the decoder's reconstruction signal vanishes faster
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