DriftingMol: Decoder-Coupled Drift for One-Pass Property-Conditional Molecular Generation

• URL: http://arxiv.org/abs/2605.24841v1
• Date: Sun, 24 May 2026 03:17:20 GMT
• Title: DriftingMol: Decoder-Coupled Drift for One-Pass Property-Conditional Molecular Generation
• Abstract summary: We introduce DriftingMol, a two-stage framework that adapts drifting models to a SELFIES latent molecular space.<n>In decoder-coupled drift, drift gradients are backpropagated through the decoder feature map to a DiT generator, inducing a pullback metric.<n>Across 15 controlled variants, models that preserve the gradient path through decoder features achieve higher correlations than the tested latent-space, random-feature, and external-feature drift variants.
• Score: 8.59642525668345
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Property-conditional molecular generation should produce valid, diverse molecules while responding to continuous target values at low sampling cost. We introduce DriftingMol, a two-stage framework that adapts drifting models to a SELFIES latent molecular space. A frozen SELFIES beta-VAE provides the latent space, and the hidden representation of its decoder serves as the drift feature map. In decoder-coupled drift, decoder weights remain fixed, but drift gradients are backpropagated through the decoder feature map to a DiT generator, inducing a pullback metric aligned with molecular decoding. On ZINC250K, the default setting achieves QED Spearman correlation 0.493 with 94.7% uniqueness, while the strongest decoder-coupled condition reaches 0.510. Under protocol-matched four-property conditioning, decoder-coupled drift reaches mean Spearman correlation up to 0.598. Across 15 controlled variants, models that preserve the gradient path through decoder features achieve higher correlations than the tested latent-space, random-feature, and external-feature drift variants, while detached or stop-gradient decoder controls yield near-zero QED correlation and very low uniqueness. These results indicate that decoder-coupled drift is a useful low-cost mechanism for property-biased molecular generation, requiring one generator evaluation and one frozen decoder pass.

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