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End of preview. Expand in Data Studio

SII Stellarator Configuration Dataset

中文

Wenyang Li | PhD student, Shanghai Innovation Institute

AI-Driven Controlled Fusion Simulation, Control & Design Lab

Email: lwydsg@mail.nankai.edu.cn | Phone: +86-156-2003-5216. License: CC BY 4.0.

Overview

Stellarator boundary configurations and recorded physics evaluations, covering NFP 1-5. This replaces the earlier 158,685-row release. The original data came from proxima-fusion/constellaration. New sources include sBO/CMA, traditional AL, earlier BO, DP, ExLLM and FusionLeague evaluations. Incremental maintenance also collects reviewed benchmark physics evaluations.

Collection updated (UTC, per-file snapshots): 2026-09-28; schema: stellarator-1.1.

Directory Configurations Parquet shards
main/ 2,775,699 56
failed/ 103,564 3

336,344 main rows have all nine metrics.

The main table retains successful evaluations. Failed records are stored separately.

Fields and Quality

Flat column names are retained. Missing values are null.

Fields Type and meaning
configuration_id, schema_version Strings: canonical configuration SHA-256 and format version
boundary.n_field_periods int64: NFP
boundary.r_cos, boundary.z_sin Nested float64 lists: stellarator-symmetric Fourier boundary
metrics.* Nine nullable float64 diagnostics listed below
evaluation.success Nullable bool; null means unknown, not failure
evaluation.error, .fidelity, .solver_version Nullable strings: original error and recorded evaluation settings
evaluation.feasibility Nullable float64: source score, not a universal constraint definition
source.name, .path, .record Strings: source family, relative file path, record locator
quality.iota_representation signed, absolute_only or unknown
quality.metric_count, .flags Count of finite metrics and list of quality/transformation flags

The .field abbreviations in a row retain that row's prefix, e.g. source.path.

Metric suffix after metrics. Meaning
aspect_ratio Aspect ratio
edge_rotational_transform_over_n_field_periods Edge iota divided by NFP
average_triangularity Average triangularity
max_elongation Maximum elongation
edge_magnetic_mirror_ratio Edge magnetic mirror ratio
vacuum_well Vacuum magnetic well
minimum_normalized_magnetic_gradient_scale_length L_delta_b
qi QI diagnostic, not log10(QI)
flux_compression_in_regions_of_bad_curvature Bad-curvature flux compression
  • Deduplication: exact NFP plus canonical Fourier coefficients. Prefer successful, then unknown, then failed evaluations; within a status prefer more complete metrics, then deterministic source order.
  • Boundary: usually 5x9; higher-order matrices such as 8x15 are also retained. For (M, 2N+1), rows are m=0..M-1, columns n=-N..N. Smaller supported grids are zero-padded; higher modes are preserved. Coefficients are not normalized or approximately rounded for deduplication.
  • Use limits: metric completeness does not establish physical feasibility or comparable solver fidelity.

Read the Data

import pyarrow.dataset as ds
data = ds.dataset("main", format="parquet")
complete = data.to_table(filter=(ds.field("quality.metric_count") == 9)
                        & (ds.field("evaluation.success") == True))

For signed-iota training also require quality.iota_representation == "signed"; for raw-QI-only studies exclude qi_reconstructed_from_log10 in quality.flags.

Maintain the Dataset

FusionLeague/datasets/stellarator/ is the editing source: main/, failed/, these two READMEs and tools/. Edit here first; the external HF clone is only a publication copy. Tools and audit archives are not uploaded. Step 1: update the source dataset on Linux.

Start from the FusionLeague/ repository root:

cd datasets/stellarator && python tools/update_dataset.py

If dependencies are missing, run python -m pip install -r tools/requirements.txt once, then retry. Wait for a successful update before copying; do not update data while copying. Add --dry-run to inspect sources only.

  • Sources: automatically scan methods/ for real qi/qi_frontier evaluation journals; skip quadratic/examples and duplicate run exports. Collect benchmarks/qi_design/data submissions only when review, result hash, submission identity and point inputs agree. Running or unapproved results are deferred. No solvers or surrogate inference run.
  • Incremental merge: index the current dataset on the first run, then remember completed log positions. Read new complete records, defer unfinished final lines, and apply the same exact deduplication/whole-record preference above. Unchanged sources are skipped; changed log prefixes are re-imported without deleting historical configurations. Revoked reviews do not automatically retract previously collected data.
  • Output: without winning additions/replacements, leave Parquet and READMEs unchanged. Otherwise export and fully verify a sorted dataset, replace main/ and failed/, and refresh only the statistics blocks in both READMEs. Ingestion is incremental, but changed datasets are fully re-exported and verified.
  • State and recovery: tools/.update-state/ holds the SQLite index, cursors, lock, latest summary, reports and previous published dataset. Only one updater may run. After an error/interruption, keep this state and rerun the same command to recover; do not manually remove its lock or edit/replace indexed Parquet files. Do not read/copy/push during installation or after an unfinished update.
  • Resources and audit: first indexing takes longer; allow space for the index, staged output and previous dataset in addition to current data. The latest last_update.json points to the report/verification/quarantine; invalid records are also kept in the index issues table. Review notices and quality/provenance before publication. Earlier publication backups are cleaned after a successful update; this is not a full version archive.

The original full-source builder remains in tools/build_dataset.py for separate rebuilds; routine updates do not rescan all historical optimization directories. Original snapshot audits remain at ../_archive/stellarator-20260927/releases/20260923-full-v1/. Local fixture tests: python -m unittest discover -s tools -p 'test_*.py'.

Publish to Hugging Face

One-time setup (skip if already cloned). Install Git LFS and run from the parent of FusionLeague/, placing the two repositories side by side:

GIT_LFS_SKIP_SMUDGE=1 git clone https://huggingface.co/datasets/SII-AI4Fusion/SII-Stellarator-Configuration-Dataset
git -C SII-Stellarator-Configuration-Dataset lfs install --local

Step 2: copy the update. Start from FusionLeague/datasets/stellarator/, where Step 1 finished. The HF clone should be on main with no uncommitted changes; replace only its data and READMEs:

cd ../../../SII-Stellarator-Configuration-Dataset &&
GIT_LFS_SKIP_SMUDGE=1 git pull --ff-only origin main &&
git rm -r --ignore-unmatch -- main failed &&
cp -r ../FusionLeague/datasets/stellarator/{main,failed,README.md,README.zh.md} . &&
git add main failed README.md README.zh.md &&
git diff --cached --stat

Step 3: review and push. Continue from the HF clone; skip if nothing changed, and resolve any error before continuing:

git commit -m "Update consolidated stellarator dataset" &&
git lfs fsck HEAD &&
git push origin main

Commands use Bash and the repository's existing Parquet LFS configuration. Only data and READMEs are copied, not tools or archives. Review data for public release and keep HF tokens out of documentation. Commit first, check LFS, then push only after success; old versions remain in commit history.

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