Add dataset card

README.md

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+---
+pretty_name: Annotated Wikipedia 2016
+license: cc-by-sa-3.0
+task_categories:
+  - text-generation
+  - token-classification
+  - text-retrieval
+language:
+  - en
+tags:
+  - wikipedia
+  - entity-linking
+  - wikification
+  - hyperlinks
+  - pretraining
+size_categories:
+  - 1M<n<10M
+configs:
+  - config_name: default
+    data_files:
+      - split: train
+        path: "data/*.parquet"
+---
+
+# Annotated Wikipedia 2016
+
+English Wikipedia (~2016 snapshot) processed into JSON, with **inline hyperlinks preserved as gold-aligned entity-link annotations**. Each article carries its full plain text plus a list of `(surface_form, target_uri, character_offset)` tuples — one per wikilink in the source.
+
+This release just re-shards the original ~5 GB stored zip (`extracted/AA/wiki00` … `extracted/NN/wiki47`, 35,148 JSONL chunk files) into parquet with a unified pyarrow schema. No filtering, no text normalisation, no entity-set restriction. Offsets are byte-faithful character offsets into `text` — verified to round-trip exactly.
+
+Mirror of the raw zip: [alvations/stash · wikipedia-json/](https://huggingface.co/datasets/alvations/stash/tree/main/wikipedia-json).
+
+## Usage
+
+```python
+from datasets import load_dataset
+
+ds = load_dataset("alvations/annotated-wiki-2016", split="train", streaming=True)
+ex = next(iter(ds))
+print(ex["title"], "—", len(ex["annotations"]), "links")
+# Anarchism — 639 links
+
+# offsets line up with text spans
+for a in ex["annotations"][:3]:
+    s = ex["text"][a["offset"]:a["offset"] + len(a["surface_form"])]
+    assert s == a["surface_form"]
+    print(a["surface_form"], "->", a["uri"])
+```
+
+Streaming is recommended — the full train split is multi-GB and 1M+ rows.
+
+## Schema
+
+| Column        | Type                                                          | Description |
+| ------------- | ------------------------------------------------------------- | ----------- |
+| `title`       | string                                                        | Article title, URL-decoded from the wiki URL path. |
+| `url`         | string                                                        | Original Wikipedia URL, e.g. `http://en.wikipedia.org/wiki/Anarchism`. |
+| `wiki_id`     | int64                                                         | Wikipedia page ID (the source dump stored it as a 1-element list — flattened here). |
+| `text`        | string                                                        | Full article plain text (no markup, no infoboxes). |
+| `annotations` | list&lt;struct&lt;surface_form: string, uri: string, offset: int32&gt;&gt; | One entry per outgoing wikilink in the article. |
+| `language`    | string                                                        | Always `"en"` in this release. |
+
+### Annotation semantics
+
+Each annotation marks one outgoing hyperlink in the source wikitext:
+
+- `surface_form` — the literal text span as it appears in the article (the link's anchor text).
+- `uri` — the linked target page, in Wikipedia URL form with underscores, e.g. `Political_philosophy`. Use as-is for joining against page-id tables; no namespace prefix.
+- `offset` — zero-based **character** offset into `text` where `surface_form` begins. `text[offset : offset + len(surface_form)] == surface_form` is guaranteed.
+
+Anchors are not deduplicated, redirected, or filtered — multiple links to the same target appear separately, and dangling/redirect targets are kept verbatim.
+
+## Sharding
+
+Parquet shards are grouped by the source zip's two-letter subdirectory (`extracted/<XX>/`):
+
+```
+data/AA.parquet
+data/AB.parquet
+...
+data/NN.parquet      (352 shards total)
+```
+
+Each shard is ~25 MB compressed (snappy), holding roughly 1,800–4,500 articles depending on average article length in that bucket.
+
+## Source
+
+Re-packaged from the upstream zip `wikipedia-json.zip` (5.0 GB stored / 18 GB uncompressed), which was itself the output of processing an English Wikipedia dump with a wikiextractor-style pipeline that retained wikilinks as offset annotations. The dataset is named `2016` after the apparent dump year of the upstream archive.
+
+## License
+
+Wikipedia text is distributed under [CC BY-SA 3.0](https://creativecommons.org/licenses/by-sa/3.0/) (with parts also under the GFDL). Attribution: contributors to the English Wikipedia. Reuse must preserve attribution and ShareAlike.
+
+## Provenance of this release
+
+- Source: `wikipedia-json.zip` — mirrored at [`alvations/stash · wikipedia-json/wikipedia-json.zip`](https://huggingface.co/datasets/alvations/stash/tree/main/wikipedia-json).
+- Conversion: streamed via `zipfile.ZipFile.open()` without on-disk extraction; one parquet shard per source subdir; nested annotations stored as `list<struct>` for native pyarrow / Polars / DuckDB consumption.
+- No row filtering, deduplication, redirect resolution, or text cleanup applied.