---
pretty_name: PTB PCFG Agreement 100M
language:
- en
license: other
size_categories:
- 10M<n<100M
tags:
- synthetic
- pcfg
- penn-treebank
- syntax
- agreement
- pretraining
- english
---

# PTB PCFG Agreement 100M

Synthetic English pretraining corpora generated from a Penn Treebank-derived constituency PCFG.

## Dataset description

This release contains three corpus variants with different subject-verb agreement cue reliability settings:

- `rel_0.5`
- `rel_0.75`
- `rel_1.0`

Each variant contains:

- `en/tokens.txt`
- `en/tokens.txt.metadata.json`

The corpora use opaque token IDs rather than English word forms and were created for experiments on structural transfer from synthetic PCFG pretraining.

## Structure

The archive `data/ptb_agree100m.tar.gz` contains:

```text
rel_0.5/en/tokens.txt
rel_0.5/en/tokens.txt.metadata.json
rel_0.75/en/tokens.txt
rel_0.75/en/tokens.txt.metadata.json
rel_1.0/en/tokens.txt
rel_1.0/en/tokens.txt.metadata.json