docs/CHANGELOG.md

# Changelog

## v1.0 update - 2026-08

- Added the complete 9-bin event voxel representation.
- Normalized payload directories to `data_5bin/` and `data_9bin/`.
- Preserved the canonical 3,263-video membership and 2,316/947 split for both variants.
- Added representation-specific metadata under `metadata/5bin/` and `metadata/9bin/`.
- Generalized timing and format documentation for bin count `B` in `{5, 9}`.
- Verified 219 shards per representation and 438 total payload shards.

Canonical HDF5 payload sizes:

- 5-bin: 4,355,745,895,245 bytes;
- 9-bin: 4,214,122,096,103 bytes.

## v1.0 - 2026-07-14

Initial public 5-bin release.

- Large: 3,263 videos and 106.941600381 hours.
- Medium: 1,537 videos and 50.000000128 hours.
- Small: 667 videos and 20.000000374 hours.
- 200 verified action classes.
- Large train/validation split: 2,316 / 947.
- HDF5 datasets: `events`, `voxel_event_start`, `voxel_event_count`.
- Canonical 5-bin HDF5 size: 4,355,745,895,245 bytes.
- Final integrity audit: PASS.

The initial small-file update added filtered ActivityNet Captions annotations,
ActivityNet v1.3 actions, derived caption/action alignment, source timing
metadata, and 219 tar-shard checksums.