{"schema_version":"papers/paper-detail-v1","title":"Faithful GRPO: Improving Visual Spatial Reasoning in Multimodal Language Models via Constrained Policy Optimization","surface":"papers","opportunity_kernel":{"paper_id":"32faa627-72c2-407f-9b02-ba3078a11db3","title":"Faithful GRPO: Improving Visual Spatial Reasoning in Multimodal Language Models via Constrained Policy Optimization","authors":["Sai Srinivas Kancheti","Aditya Kanade","Rohit Sinha","Vineeth N Balasubramanian","Tanuja Ganu"],"arxiv_id":"2604.08476v1","doi":null,"published_at":"2026-04-09T17:15:47.000Z","score_object":{"overall":{"value":7,"scale":"0-10","confidence":0.85,"confidence_reason":"Backfilled from persisted papers.viability_score.","model_version":"phase0-backfill-v1","pipeline_version":"phase0-kernel-v1","computed_at":"2026-04-10T17:22:14.513Z","fresh_until":"2026-05-10T17:22:14.513Z","is_stale":true,"source_count":1,"missingness":[]},"technical":{"value":1.4,"scale":"0-10","confidence":0.55,"confidence_reason":"Backfilled from paper_extraction_scorecards.reconstruction_score.","model_version":"phase0-backfill-v1","pipeline_version":"phase0-kernel-v1","computed_at":"2026-04-10T17:23:53.095Z","fresh_until":"2026-04-24T17:23:53.095Z","is_stale":true,"source_count":1,"missingness":["reproducibility_results.reproducibility_score","deployability_scores.score"]},"commercial":{"value":4,"scale":"0-10","confidence":0.75,"confidence_reason":"Backfilled from persisted commercial_flags and repo availability.","model_version":"phase0-backfill-v1","pipeline_version":"phase0-kernel-v1","computed_at":"2026-04-10T17:22:14.513Z","fresh_until":"2026-05-10T17:22:14.513Z","is_stale":true,"source_count":1,"missingness":[]},"market":{"value":2,"scale":"0-10","confidence":0.8,"confidence_reason":"Backfilled from distribution_readiness_scores.score.","model_version":"phase0-backfill-v1","pipeline_version":"phase0-kernel-v1","computed_at":"2026-04-10T17:37:48.674Z","fresh_until":"2026-04-24T17:37:48.674Z","is_stale":true,"source_count":1,"missingness":[]},"team":{"value":6.5,"scale":"0-10","confidence":0.42,"confidence_reason":"Heuristic fallback from paper author count and extracted affiliations.","model_version":"phase0-backfill-v1","pipeline_version":"phase0-kernel-v1","computed_at":"2026-04-10T17:22:14.513Z","fresh_until":"2026-04-24T17:22:14.513Z","is_stale":true,"source_count":2,"missingness":[]},"methodology":{"value":3.9,"scale":"0-10","confidence":0.82,"confidence_reason":"Backfilled from paper_extraction_scorecards.total_score.","model_version":"phase0-backfill-v1","pipeline_version":"phase0-kernel-v1","computed_at":"2026-04-10T17:23:53.095Z","fresh_until":"2026-05-10T17:23:53.095Z","is_stale":true,"source_count":2,"missingness":[]}},"evidence_receipt":{"freshness":"stale","proof_status":"unverified","repo_status":"missing","references_count":0,"source_count":3,"coverage":0.5,"missingness":["repo_url","references","proof_status"],"unresolved_unknowns":["proof verification has not been recorded yet"],"last_verification_at":"2026-04-10T17:37:48.674Z"},"lineage_hash":"53066def819f2dc82284817058f9960f37de93272ccc623299b8b666d8f25bb6"},"distribution":null,"replication_evidence":[],"author_dna":[]}