# Element Graph v2.1 — Multimodal Academic Document Retrieval

Typed element graphs derived from three multimodal academic document QA datasets:
SPIQA, SciEGQA, and MMDocIR. Each document is decomposed into a typed graph
with cross-modal edges (`caption_of`), reference edges (`refer_to`), and
section-aware structural edges (`contains`, `reading_next`, `section_next`).

The graphs are designed for retrieval research:
- Training supervision via **Graph-Relevance Contrastive Loss** (GRCL)
- Inference-time **graph propagation** of retrieval scores
- Same edge-weight schema drives both (single source of truth)

## Contents

| Subset | Papers | Elements | Caption-figure pairs | Refer_to edges |
|---|---:|---:|---:|---:|
| **spiqa-v2.1/train**  | 25,459 | 1,873,124 | 262,524 | 231,101 |
| spiqa-v2.1/val        | 200    | 14,537    | 2,085   | 1,947   |
| spiqa-v2.1/test-A     | 118    | 9,039     | 1,115   | 1,191   |
| **sciegqa-v2.1**      | 80     | 21,817    | 444     | 1,103   |
| **mmdocir-v2.1**      | 75     | 15,434    | 203     | 475     |

## Per-document section count

| Dataset | min | median | mean | max |
|---|---:|---:|---:|---:|
| spiqa-v2.1 (test-A; LaTeX-based) | 1 | 7 | 7.2 | 24 |
| sciegqa-v2.1 (docling-based) | 1 | 10 | 12.8 | 54 |
| mmdocir-v2.1 (docling-based) | 3 | 9 | 13.1 | 122 |

## Schema
See `SCHEMA.md` for full schema definition (node types, edge types, attributes,
target-attribute modifiers).

## Provenance
- **SPIQA**: graph extracted from original LaTeX (`\section{}`, `\ref{}`) and
  `all_figures` metadata. Caption-figure pairs are author-provided.
- **SciEGQA**: graph derived from docling layout parsing + heuristic extraction.
- **MMDocIR**: graph derived from MMDocIR_layouts.parquet + heuristic extraction.

## Reference (original datasets)
- SPIQA: Pramanick et al., NeurIPS 2024 D&B
- SciEGQA: arXiv:2511.15090
- MMDocIR: Dong et al., EMNLP 2025

## Images
Image files are NOT included. Download from original dataset sources and
look up by (doc_id, eid) — the eid is preserved as the figure filename
(SPIQA) or layout_id (MMDocIR).

## License
Each subset inherits the license of the original dataset. See per-subset
README files.