README.md

metadata

features:
  - name: input
    dtype: string
  - name: output
    dtype: json
  - name: schema
    list:
      - name: label
        dtype: string
      - name: description
        dtype: string
configs:
  - config_name: default
    data_files:
      - split: train
        path: data/maven_train.jsonl
      - split: validation
        path: data/maven_validation.jsonl

MAVEN (mneb/casie format)

MAVEN (Wang et al., EMNLP 2020) converted into the mneb json_structures event-extraction format. MAVEN is a massive general-domain event detection dataset — 168 event types over English Wikipedia documents. It is ED-only (no argument annotation), so each record's output carries only json_structures; every event's arguments is always []. One record = one sentence. ALL sentences are kept, including event-less ones (json_structures: {}). Char offsets are end-exclusive (input[start:end] == text). Event-type strings are kept verbatim from the raw release.

Splits

Official MAVEN document split:

Split	Docs	Sentences	Event mentions
train	2,913	32,431	77,993
validation	710	8,042	18,904

validation is MAVEN's raw valid split, renamed for naming consistency with the other converted datasets. The official test split is not included: its annotations are withheld for the CodaLab leaderboard, so it carries no gold event type or mention, only candidate triggers.

What is dropped from the raw release

• The unlabeled test split.
• negative_triggers and other candidate lists (explicitly-labeled non-events).
• Event coreference: MAVEN groups multiple mentions under one event instance. The flat per-sentence format used here cannot represent that grouping, so mentions become independent trigger entries — mention counts are preserved exactly (nothing deduplicated or merged).
• Numeric type_ids, mention/event ids, and the raw per-sentence token lists.

Token -> char note

MAVEN's raw trigger spans are token indices into per-sentence token lists that are lossy (lowercased, rare words replaced by the literal string unk, PTB escapes for brackets/quotes). Triggers were re-anchored to the raw sentence text via greedy earliest-match case-insensitive alignment, trying PTB-variant candidates alongside the raw token, plus a neighbor-window fallback search for unk-substituted tokens. This recovered 100% of mentions: 0 drops, 0 offset failures across both splits. The emitted trigger text is always the authoritative sentence slice (input[start:end]); it differs from the raw trigger_word in 795 (train) + 200 (validation) cases, all case-only.

Provenance & license

Source: THU-KEG/MAVEN-dataset (data distributed via Google Drive / Tsinghua Cloud), MIT license. Document text is drawn from English Wikipedia (CC BY-SA). The event schema is derived from FrameNet. Annotations are crowd-sourced.

See maven_label_summary.md for the full 168-type inventory and per-split counts, and maven_vis.html for a sampled visualiser (stratified sample, ≤20 records/type per split + 10 empty records per split).