GRC: generation, reflection, and correction for generative recommendation¶

Fidelity: core mechanism. Runs structured SFT, full-trajectory GRPO, and entropy-guided reflection scheduling.

Paper information¶

Field	Details
Paper	arXiv 2602.23639
Organization	Alibaba International / Wuhan University
First public release	2026-02-27 (arXiv v1)
Authors' code	The paper did not provide official or author code when checked on 2026-08-09.
Adapter / method	`grc`
Local reproduction code	`src/auto_research/reproductions/grc/`

Original paper¶

Motivation and method¶

Early errors in autoregressive semantic-ID generation can propagate. GRC structures a draft SID, reflection on the first error and attribute consistency, and a corrected SID. It applies GRPO to whole trajectories and allocates a fixed correction budget to the most uncertain beams using reflection-token entropy.

flowchart LR
  A[User history] --> B[Generate draft SID]
  B --> C[Reflect on first error and semantics]
  C --> D[Corrected SID]
  D --> E[Trajectory GRPO]
  C --> F[Fixed-budget EGRS scheduling]

Key figure from the paper¶

Figure 2: Core architecture, modules, and their connections. From the original paper; copyright remains with the authors.

Core equations¶

\[ r_{loc}=\min\big(\{t:\hat z_t\ne z_t^{gt}\}\cup\{L+1\}\big),\qquad \mathcal L_{SFT}=\mathcal L_{MLE}+\lambda_{rc}\mathcal L_{rc}. \]

\[ \operatorname{score}_{EGRS}=\operatorname{score}_{base}+\alpha_e\bar H^{ref}. \]

Paper results¶

From 2026-01-02 through January 12, with 15% traffic per arm, revenue rose +1.79%, CTR +2.11%, and GMV +2.04%, all significant.

Local reproduction¶

Local comparison: The baseline is the GR backbone with the same SID. GRC adds 1,320 structured trajectories, 10 GRPO rounds, and EGRS. Relative Hit@10 is -12.50% and NDCG@10 -11.12%.

Mean GRPO reward rises 8.3989→8.4273 while full-catalog test ranking degrades. See the stable metrics.

auto-research reproduce --paper grc --seed 42

Reproduction boundaries¶

MovieLens genre stands in for category, seller, and brand. Industrial LLM parameter scale is not reproduced.