| # Loading samples |
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| Download `sample_index.jsonl.gz` and the shard containing the desired sample. Resolve a repository revision first so all downloaded files belong to the same release. |
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| ```python |
| import gzip, hashlib, json, tarfile |
| from huggingface_hub import HfApi, hf_hub_download |
| |
| repo = "ChartGalaxyPP/ChartGalaxyPlusPlus" |
| revision = HfApi().dataset_info(repo).sha |
| index = hf_hub_download(repo, "sample_index.jsonl.gz", repo_type="dataset", revision=revision) |
| sample_id = "d3-js_horizontal_group_bar_chart_horizontal_group_bar_chart_03/sample_28444" |
| with gzip.open(index, "rt") as f: |
| entry = next(r for r in map(json.loads, f) if r["sample_id"] == sample_id) |
| shard = hf_hub_download(repo, entry["shard"], repo_type="dataset", revision=revision) |
| with tarfile.open(shard, "r:gz") as archive: |
| raw = archive.extractfile(entry["annotation_file"]).read() |
| assert hashlib.sha256(raw).hexdigest() == entry["annotation_sha256"] |
| record = json.loads(raw) |
| graph = record["scene_graph"] |
| spatial = record["spatial_relations"] |
| if record["source_type"] == "synthetic": |
| png = archive.extractfile(record["image_file"]).read() |
| assert hashlib.sha256(png).hexdigest() == record["image_sha256"] |
| else: |
| print(record["source_url"], record["image_url"], record["image_archive_url"]) |
| ``` |
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| Each shard is independently extractable. A real shard contains JSON files only. A synthetic shard contains one PNG and one JSON per chart. Example files duplicate an existing training record and do not add to the dataset count. |
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| Source-page URLs are not direct image URLs. Some real charts retain a public archive URL plus exact member information; see [DATA_FORMAT.md](DATA_FORMAT.md). Current URL availability is not guaranteed. Preserve frame selection and conversion before comparing a retrieved source with its annotation-input checksum. |
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| For a full download, use `snapshot_download(repo, repo_type="dataset", revision=revision)` from `huggingface_hub`, then run `sha256sum -c SHA256SUMS` in the downloaded directory. Underlying data-table files and pipeline implementation code are not included. |
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