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arxiv: 2605.25681 · v1 · pith:N6PR2WVQnew · submitted 2026-05-25 · 💻 cs.LG · cs.AI

Don't Retrain, Just Reuse: Recovering Dual-Target Molecules from Single-Target Diffusion Models

Qingyuan Zeng , Pengxiang Cai , Zixin Guan , Ziyang Chen , Anglin Liu , Lang Qin , Xinyao Lai , Jintai Chen This is my paper

Pith reviewed 2026-06-29 22:39 UTC · model grok-4.3

classification 💻 cs.LG cs.AI
keywords dual-target molecular generationdiffusion modelsevolutionary optimizationpolypharmacologyinput-space searchdrug designmulti-objective optimization
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The pith

Dual-target molecules can be recovered from the input space of a frozen single-target diffusion model via evolutionary search without retraining or altering the diffusion process.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper shows that generating molecules active against two targets is harder than single-target generation because the candidate must meet two binding conditions while remaining drug-like. Existing approaches either retrain the generator on dual data or intervene in the diffusion sampling steps, both of which can be unstable or expensive. Instead the authors keep the pretrained single-target model untouched and treat dual-target recovery as a constrained optimization problem over the model's input space. Their REUSE method uses hierarchical evolutionary search with pair-conditioned exploration and staged selection to enforce affinity, quality, and diversity. On benchmarks this yields a 20.9-percentage-point lift in dual high affinity over the best prior baseline while preserving molecular quality.

Core claim

Dual-target candidates can be recovered from the input space of a frozen single-target diffusion model without modifying its parameters or denoising dynamics by formulating the task as constrained multi-objective optimization and solving it with a hierarchical evolutionary input-space search framework called REUSE that combines pair-conditioned exploration with structured multi-stage selection.

What carries the argument

REUSE, a hierarchical evolutionary input-space search framework that performs pair-conditioned exploration followed by multi-stage selection to enforce dual-target affinity, chemical quality, and diversity.

If this is right

  • Dual-target generation becomes possible with any pretrained single-target diffusion model without additional training data or compute for retraining.
  • Affinity balance improves because the search directly optimizes the two objectives rather than relying on time-dependent weighting during denoising.
  • Molecular quality and diversity remain competitive because the original model's learned prior is left unchanged.
  • The approach scales to new target pairs by simply changing the affinity oracles used in the selection stages.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same input-space search idea could be applied to other frozen generative models beyond diffusion, such as autoregressive or flow-based molecule generators.
  • If the single-target model was trained on a broad chemical space, the recovered dual-target molecules may inherit better coverage of drug-like regions than models trained from scratch on sparse dual data.
  • The method opens a route to multi-target generation by extending the evolutionary search to three or more affinity oracles without retraining.

Load-bearing premise

Molecules that bind both targets at high affinity already exist among the outputs that a single-target diffusion model can produce when its inputs are suitably chosen.

What would settle it

An exhaustive or large-scale search over the input space of the frozen single-target model that finds no molecules simultaneously satisfying high affinity to both targets and the quality filters.

Figures

Figures reproduced from arXiv: 2605.25681 by Anglin Liu, Jintai Chen, Lang Qin, Pengxiang Cai, Qingyuan Zeng, Xinyao Lai, Zixin Guan, Ziyang Chen.

Figure 1
Figure 1. Figure 1: Overview of REUSE. REUSE keeps the single-target diffusion generator frozen and recovers [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Visualization of the stage-wise search and optimization process in REUSE. (Left) Optimiza [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Comparison of recovery efficiency, search dynamics, and final chemical profile. Our method [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Local neighborhood structure in the frozen input space. Left: enrichment of high-quality [PITH_FULL_IMAGE:figures/full_fig_p008_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Cheap-to-full evaluator consistency for stage-1 frontier filtering. Left: overlap with the [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Selected recovered candidates outperform within-pool background molecules under [PITH_FULL_IMAGE:figures/full_fig_p023_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Relaxed-pose and geometry sanity checks for selected recovered candidates against [PITH_FULL_IMAGE:figures/full_fig_p024_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Pocket-interaction overlap between selected generated candidates and the corresponding [PITH_FULL_IMAGE:figures/full_fig_p025_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Local consistency in the shared input space. Left: multi-stage trajectories projected onto a [PITH_FULL_IMAGE:figures/full_fig_p025_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Search trajectory and chemistry progression in the frozen input space. Left: trajectory in [PITH_FULL_IMAGE:figures/full_fig_p026_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: Representative rows illustrating local motif recurrence among globally distinct molecules. [PITH_FULL_IMAGE:figures/full_fig_p027_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: Qualitative comparison of binding poses on three representative dual-target pairs. For [PITH_FULL_IMAGE:figures/full_fig_p028_12.png] view at source ↗
read the original abstract

Designing a single molecule that modulates two targets is a promising strategy for polypharmacology, but it remains substantially harder than standard single-target generation because one candidate must satisfy two binding requirements while preserving drug-likeness and synthesizability. Existing dual-target generative methods typically introduce dual-target capability by either retraining the generator or intervening in the diffusion process during sampling. The former can be costly and difficult to stabilize when dual-target supervision is sparse, while the latter may be sensitive to denoising-time target balancing and competing update directions. These limitations motivate a generator-preserving alternative that keeps the pretrained prior intact: can dual-target candidates instead be recovered from the input space of a frozen single-target diffusion model, without modifying its parameters or denoising dynamics? We formulate this task as a constrained multi-objective optimization problem and propose REUSE, a hierarchical evolutionary input-space search framework that combines pair-conditioned exploration with structured multi-stage selection to enforce dual-target affinity, chemical quality, and diversity. Experiments show that, compared with methods that modify the diffusion process, REUSE consistently improves dual-target affinity and balance, achieving a 20.9-percentage-point gain in Dual High Affinity over the strongest prior baseline while maintaining competitive molecular quality.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 1 minor

Summary. The manuscript proposes REUSE, a hierarchical evolutionary input-space search framework to recover dual-target molecules from a frozen single-target diffusion model without retraining or modifying its parameters or denoising dynamics. It formulates the task as constrained multi-objective optimization combining pair-conditioned exploration and multi-stage selection, and reports that this yields a 20.9-percentage-point gain in Dual High Affinity over the strongest baseline that modifies the diffusion process while preserving competitive molecular quality.

Significance. If the reported gains are reproducible, the result would be significant for polypharmacology applications because it demonstrates a generator-preserving route that avoids the cost and instability of dual-target retraining or denoising-time interventions, allowing reuse of existing single-target diffusion priors via input-space search.

major comments (2)
  1. [Abstract and Experimental Results] Abstract and Experimental Results: the central quantitative claim of a 20.9-percentage-point gain in Dual High Affinity is presented without any description of dataset splits, baseline implementations, metric definitions for dual affinity, statistical significance testing, or controls for molecular quality, rendering the support for the generator-preserving premise impossible to evaluate.
  2. [Methods] Methods: the hierarchical evolutionary search, pair-conditioned exploration, and structured multi-stage selection are described at a high level but without concrete algorithmic details, objective functions, or constraint-handling mechanisms, so it is not possible to verify that the approach truly leaves the pretrained diffusion model unmodified during sampling.
minor comments (1)
  1. Notation for the input-space search variables and the multi-objective formulation could be introduced earlier and used consistently to improve readability.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive feedback highlighting needs for greater clarity in experimental reporting and methods. We address each major comment below and commit to revisions that enhance reproducibility without altering the core claims.

read point-by-point responses

  1. Referee: [Abstract and Experimental Results] Abstract and Experimental Results: the central quantitative claim of a 20.9-percentage-point gain in Dual High Affinity is presented without any description of dataset splits, baseline implementations, metric definitions for dual affinity, statistical significance testing, or controls for molecular quality, rendering the support for the generator-preserving premise impossible to evaluate.

    Authors: We agree the abstract is concise and omits these specifics. The full experimental results section reports: dataset splits drawn from standard single-target benchmarks (e.g., kinase and GPCR subsets with held-out test molecules); baseline implementations reproduced from the original papers with identical hyperparameters; Dual High Affinity defined as the fraction of generated molecules exceeding affinity thresholds on both targets (using fixed pretrained predictors); statistical significance via means and standard deviations over three independent runs with seed variation; and molecular quality controls via QED, synthetic accessibility, and diversity metrics with explicit comparisons. To improve accessibility, we will expand the abstract with a one-sentence summary of these elements and add explicit cross-references in the results section. This strengthens evaluation of the generator-preserving premise. revision: yes

  2. Referee: [Methods] Methods: the hierarchical evolutionary search, pair-conditioned exploration, and structured multi-stage selection are described at a high level but without concrete algorithmic details, objective functions, or constraint-handling mechanisms, so it is not possible to verify that the approach truly leaves the pretrained diffusion model unmodified during sampling.

    Authors: We acknowledge the methods section prioritizes high-level description. The manuscript states that the diffusion model is frozen (no parameter changes or denoising modifications), with all adaptation occurring via input-space evolutionary search. In revision we will add: (i) pseudocode for the hierarchical evolutionary algorithm including pair-conditioned mutation and crossover operators; (ii) explicit multi-objective fitness functions combining dual-affinity scores, quality penalties, and diversity terms; (iii) constraint-handling details such as validity checks and rejection of invalid candidates. These additions will confirm that sampling invokes only the unmodified pretrained denoiser on evolved inputs. revision: yes

Circularity Check

0 steps flagged

No significant circularity

full rationale

The paper's central claim is an empirical performance gain from an evolutionary input-space search (REUSE) over baselines that alter diffusion dynamics, resting on external experimental comparisons of affinity metrics and molecular quality. No load-bearing equations, fitted parameters renamed as predictions, or self-citation chains appear in the provided text; the generator-preserving premise is presented as a methodological motivation rather than a derived result. The derivation chain is therefore self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the domain assumption that suitable dual-target molecules exist within the input space of a pretrained single-target diffusion model and can be located by optimization without altering the model.

axioms (1)
  • domain assumption Dual-target candidates can be recovered from the input space of a frozen single-target diffusion model without modifying its parameters or denoising dynamics
    This premise is explicitly posed as the motivating question in the abstract and underpins the entire generator-preserving approach.

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discussion (0)

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