{"id":"https://openalex.org/W7166799623","doi":"https://doi.org/10.18653/v1/2026.acl-long.1185","title":"S2G-RAG: Structured Sufficiency and Gap Judging for Iterative Retrieval-Augmented QA","display_name":"S2G-RAG: Structured Sufficiency and Gap Judging for Iterative Retrieval-Augmented QA","publication_year":2026,"publication_date":"2026-01-01","ids":{"openalex":"https://openalex.org/W7166799623","doi":"https://doi.org/10.18653/v1/2026.acl-long.1185"},"language":null,"primary_location":{"id":"doi:10.18653/v1/2026.acl-long.1185","is_oa":true,"landing_page_url":"https://doi.org/10.18653/v1/2026.acl-long.1185","pdf_url":"https://aclanthology.org/2026.acl-long.1185.pdf","source":null,"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Proceedings of the 64th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)","raw_type":"proceedings-article"},"type":"conference-paper","indexed_in":["crossref"],"open_access":{"is_oa":true,"oa_status":"gold","oa_url":"https://aclanthology.org/2026.acl-long.1185.pdf","any_repository_has_fulltext":null},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5139774275","display_name":"Minghan Li","orcid":null},"institutions":[{"id":"https://openalex.org/I3923682","display_name":"Soochow University","ror":"https://ror.org/05t8y2r12","country_code":"CN","type":"education","lineage":["https://openalex.org/I3923682"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Minghan Li","raw_affiliation_strings":["Soochow University , Suzhou , China"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Soochow University , Suzhou , China","institution_ids":["https://openalex.org/I3923682"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5052070029","display_name":"Junjie Zou","orcid":null},"institutions":[{"id":"https://openalex.org/I3923682","display_name":"Soochow University","ror":"https://ror.org/05t8y2r12","country_code":"CN","type":"education","lineage":["https://openalex.org/I3923682"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Junjie Zou","raw_affiliation_strings":["Soochow University , Suzhou , China"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Soochow University , Suzhou , China","institution_ids":["https://openalex.org/I3923682"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5123348231","display_name":"Xinxuan Lv","orcid":null},"institutions":[{"id":"https://openalex.org/I3923682","display_name":"Soochow University","ror":"https://ror.org/05t8y2r12","country_code":"CN","type":"education","lineage":["https://openalex.org/I3923682"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Xinxuan Lv","raw_affiliation_strings":["Soochow University , Suzhou , China"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Soochow University , Suzhou , China","institution_ids":["https://openalex.org/I3923682"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5139771161","display_name":"Chao Zhang","orcid":null},"institutions":[{"id":"https://openalex.org/I3923682","display_name":"Soochow University","ror":"https://ror.org/05t8y2r12","country_code":"CN","type":"education","lineage":["https://openalex.org/I3923682"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Chao Zhang","raw_affiliation_strings":["Soochow University , Suzhou , China"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Soochow University , Suzhou , China","institution_ids":["https://openalex.org/I3923682"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5139722642","display_name":"Guodong Zhou","orcid":null},"institutions":[{"id":"https://openalex.org/I3923682","display_name":"Soochow University","ror":"https://ror.org/05t8y2r12","country_code":"CN","type":"education","lineage":["https://openalex.org/I3923682"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Guodong Zhou","raw_affiliation_strings":["Soochow University , Suzhou , China"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Soochow University , Suzhou , China","institution_ids":["https://openalex.org/I3923682"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":1,"corresponding_author_ids":[],"corresponding_institution_ids":["https://openalex.org/I3923682"],"apc_list":null,"apc_paid":null,"fwci":0.0,"has_fulltext":true,"cited_by_count":0,"citation_normalized_percentile":{"value":0.7890999,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":null,"issue":null,"first_page":"25846","last_page":"25862"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10181","display_name":"Natural Language Processing Techniques","score":0.13410000503063202,"subfield":{"id":"https://openalex.org/subfields/1702","display_name":"Artificial Intelligence"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T10181","display_name":"Natural Language Processing Techniques","score":0.13410000503063202,"subfield":{"id":"https://openalex.org/subfields/1702","display_name":"Artificial Intelligence"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10286","display_name":"Information Retrieval and Search Behavior","score":0.12790000438690186,"subfield":{"id":"https://openalex.org/subfields/1710","display_name":"Information Systems"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10201","display_name":"Speech Recognition and Synthesis","score":0.10119999945163727,"subfield":{"id":"https://openalex.org/subfields/1702","display_name":"Artificial Intelligence"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/context","display_name":"Context (archaeology)","score":0.29120001196861267},{"id":"https://openalex.org/keywords/measure","display_name":"Measure (data warehouse)","score":0.2842000126838684},{"id":"https://openalex.org/keywords/focus","display_name":"Focus (optics)","score":0.27889999747276306},{"id":"https://openalex.org/keywords/iterative-and-incremental-development","display_name":"Iterative and incremental development","score":0.2727000117301941},{"id":"https://openalex.org/keywords/quality","display_name":"Quality (philosophy)","score":0.2721000015735626}],"concepts":[{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.5175999999046326},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.3578999936580658},{"id":"https://openalex.org/C2779343474","wikidata":"https://www.wikidata.org/wiki/Q3109175","display_name":"Context (archaeology)","level":2,"score":0.29120001196861267},{"id":"https://openalex.org/C2780009758","wikidata":"https://www.wikidata.org/wiki/Q6804172","display_name":"Measure (data warehouse)","level":2,"score":0.2842000126838684},{"id":"https://openalex.org/C192209626","wikidata":"https://www.wikidata.org/wiki/Q190909","display_name":"Focus (optics)","level":2,"score":0.27889999747276306},{"id":"https://openalex.org/C143587482","wikidata":"https://www.wikidata.org/wiki/Q1543216","display_name":"Iterative and incremental development","level":2,"score":0.2727000117301941},{"id":"https://openalex.org/C2779530757","wikidata":"https://www.wikidata.org/wiki/Q1207505","display_name":"Quality (philosophy)","level":2,"score":0.2721000015735626},{"id":"https://openalex.org/C177264268","wikidata":"https://www.wikidata.org/wiki/Q1514741","display_name":"Set (abstract data type)","level":2,"score":0.2662999927997589},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.26579999923706055},{"id":"https://openalex.org/C2776401178","wikidata":"https://www.wikidata.org/wiki/Q12050496","display_name":"Feature (linguistics)","level":2,"score":0.2578999996185303}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.18653/v1/2026.acl-long.1185","is_oa":true,"landing_page_url":"https://doi.org/10.18653/v1/2026.acl-long.1185","pdf_url":"https://aclanthology.org/2026.acl-long.1185.pdf","source":null,"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Proceedings of the 64th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)","raw_type":"proceedings-article"}],"best_oa_location":{"id":"doi:10.18653/v1/2026.acl-long.1185","is_oa":true,"landing_page_url":"https://doi.org/10.18653/v1/2026.acl-long.1185","pdf_url":"https://aclanthology.org/2026.acl-long.1185.pdf","source":null,"license":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Proceedings of the 64th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)","raw_type":"proceedings-article"},"sustainable_development_goals":[],"awards":[{"id":"https://openalex.org/G5789064403","display_name":null,"funder_award_id":"62376178","funder_id":"https://openalex.org/F4320321001","funder_display_name":"National Natural Science Foundation of China"}],"funders":[{"id":"https://openalex.org/F4320321001","display_name":"National Natural Science Foundation of China","ror":"https://ror.org/01h0zpd94"},{"id":"https://openalex.org/F4320327518","display_name":"Priority Academic Program Development of Jiangsu Higher Education Institutions","ror":null}],"has_content":{"pdf":true,"grobid_xml":true},"content_urls":{"pdf":"https://content.openalex.org/works/W7166799623.pdf","grobid_xml":"https://content.openalex.org/works/W7166799623.grobid-xml"},"referenced_works_count":0,"referenced_works":[],"related_works":[],"abstract_inverted_index":{"Retrieval-Augmented":[0],"Generation":[1],"(RAG)":[2],"grounds":[3],"language":[4],"models":[5],"in":[6],"external":[7],"evidence,":[8],"but":[9],"multi-hop":[10,135],"question":[11],"answering":[12,79],"remains":[13],"difficult":[14],"because":[15],"iterative":[16,62],"pipelines":[17,150],"must":[18],"control":[19],"what":[20],"to":[21],"retrieve":[22],"next":[23,98],"and":[24,52,58,129,138],"when":[25],"the":[26,74,89,97,157,162],"available":[27],"evidence":[28,37,76],"is":[29],"adequate.In":[30],"practice,":[31],"systems":[32],"may":[33,41],"answer":[34],"from":[35,123],"incomplete":[36],"chains,":[38],"or":[39,44,160],"they":[40],"accumulate":[42],"redundant":[43],"distractor-heavy":[45],"text":[46],"that":[47,87,132],"interferes":[48],"with":[49,64,151],"later":[50],"retrieval":[51,99,104],"reasoning.We":[53],"propose":[54],"S2G-RAG":[55,133,143],"(Structured":[56],"Sufficiency":[57],"Gap-judging":[59],"RAG),":[60],"an":[61,65],"framework":[63],"explicit":[66],"controller,":[67],"S2G-Judge.At":[68],"each":[69],"turn,":[70],"S2G-Judge":[71],"predicts":[72],"whether":[73],"current":[75],"memory":[77],"supports":[78],"and,":[80],"if":[81],"not,":[82],"outputs":[83],"structured":[84],"gap":[85,94],"items":[86,95],"describe":[88],"missing":[90],"information.We":[91],"map":[92],"these":[93],"into":[96,147],"query,":[100],"producing":[101],"stable":[102],"multi-turn":[103,141],"trajectories.To":[105],"reduce":[106],"noise":[107],"accumulation,":[108],"we":[109],"maintain":[110],"a":[111,117,152],"sentence-level":[112],"Evidence":[113],"Context":[114],"by":[115],"extracting":[116],"compact":[118],"set":[119],"of":[120],"relevant":[121],"sentences":[122],"retrieved":[124],"documents.Experiments":[125],"on":[126],"TriviaQA,":[127],"HotpotQA,":[128],"2WikiMultiHopQA":[130],"show":[131],"improves":[134],"QA":[136],"performance":[137],"robustness":[139],"under":[140],"retrieval.Furthermore,":[142],"can":[144],"be":[145],"integrated":[146],"existing":[148],"RAG":[149],"lightweight":[153],"component,":[154],"without":[155],"modifying":[156],"search":[158],"engine":[159],"retraining":[161],"generator.":[163]},"counts_by_year":[],"updated_date":"2026-07-29T14:22:42.915294","created_date":"2026-07-02T00:00:00"}
