| --- |
| license: cc0-1.0 |
| language: [en] |
| pretty_name: "LCSHBench v1.0" |
| task_categories: [text-classification, text-retrieval] |
| tags: [library-science, subject-indexing, LCSH, cataloging, multilingual] |
| configs: |
| - config_name: dev |
| data_files: dev/dev.jsonl |
| - config_name: dev_2k |
| data_files: dev_2k/dev_2k.jsonl |
| - config_name: test |
| data_files: test/test.jsonl |
| - config_name: consensus_matched |
| data_files: consensus_matched/consensus_matched.parquet |
| - config_name: vocab |
| data_files: vocab/vocab.jsonl |
| --- |
| |
| # LCSHBench v1.0 |
|
|
| A multilingual, **consensus-grounded** benchmark for Library of Congress Subject |
| Heading (LCSH) assignment. Ground truth is the agreement of independent research |
| libraries (Columbia, Harvard, Princeton) cataloging the same work. |
|
|
| ## Configs |
| | config | rows | description | |
| |---|---|---| |
| | `dev` | 18,993 | development split (full per-catalog + merged + unanimous GT) | |
| | `dev_2k` | 2,002 | language-balanced 2K evaluation subset | |
| | `test` | 3,353 | held-out test inputs; answers in `gt_test.hashed.json` (SHA-256) | |
| | `consensus_matched` | 1,286,609 | every work cataloged by >=2 libraries: per-library headings (hashed IDs) — the provenance/concordance population | |
| | `vocab` | 515,281 | LCSH+LCGFT retrieval vocabulary | |
|
|
| ## Inter-cataloger concordance (why consensus) |
| Over 465,187 works cataloged by all three libraries: **93.3%** share a |
| concept-level heading, only **0.2%** share none (median concept Jaccard 0.86) — |
| yet just **39.4%** assign identical exact sets and **35.6%** of assertions are |
| single-source. Subject *identification* is objective; *expression* is subjective. |
| Human ceiling (a library vs the consensus of the other two): **86.9%** exact / |
| **93.0%** concept recall. |
|
|
| ## Not included |
| The fine-tuned embedder and te3 embedding indices are **not** released |
| (model not published; te3 vectors are derived from a hosted API). Raw MARC is |
| redistributable from the source libraries; rebuild instructions in the repo. |
|
|
| ## License & citation |
| Data: CC0-1.0 (derived from CC0 bulk MARC). Identifiers are hashed. |
| Built by the v2.2 extraction pipeline. Citation: TBD. |
|
|
