MilkClouds/blobpack-demo

Blob Pack demo

A small dataset stored as Blob Pack: annotations in parquet, media in uncompressed (STORED) zip shards, each row holding a string reference to its blob. It exists to show the layout on real data, in one place, across domains.

config	rows	shards	packed	license
images	2,000	1	238.7 MiB	cc-by-4.0
audio	2,000	1	258.9 MiB	cc-by-4.0
robot	206	1	6.7 MiB	mit

Reading it

from datasets import load_dataset
from blobpack import PackSet
from huggingface_hub import snapshot_download

root = snapshot_download("MilkClouds/blobpack-demo", repo_type="dataset")
table = load_dataset("MilkClouds/blobpack-demo", "images", split="train")

with PackSet(f"{root}/images/media") as packs:
    payload = packs.read(table[0]["image_ref"])

References are relative to the config directory, so the folder can be moved or copied anywhere and keeps resolving. Every shard is an ordinary zip: unzip reads it, no library required.

The -preview configs

The Hub's viewer resolves parquet and plain files, not members inside an archive, so it cannot follow a Blob Pack reference. Each domain therefore has a <name>-preview config of 64 rows with the media embedded inline, purely so this page renders. Use the plain configs for anything real: a preview is a duplicate of the first few rows and exists only for the viewer. (Separate configs, because the embedded-media schema cannot share one with the reference schema.)

Sources and attribution

Each subset comes from a different upstream corpus under its own terms. The Hub takes one license per repository, so this one is tagged other and the real terms are given per subset above.

images — PASS (Yalniz et al.), CC BY 4.0; contains no identifiable people. Per-image photographer attribution for this subset ships as images/ATTRIBUTION.csv. audio — LibriSpeech dev-clean — Panayotov, Chen, Povey, Khudanpur, ICASSP 2015, CC BY 4.0. Source recordings from LibriVox (public domain). robot — lerobot/pusht, MIT — Copyright (c) 2023 Columbia Artificial Intelligence and Robotics Lab; see Chi et al., Diffusion Policy (arXiv:2303.04137). Simulated rollouts, so no upstream photographic rights-holder.

Blob Pack repackages the media; it does not modify the bytes. The bytes column records each payload's original size so a copy can be checked against the source.