The dataset viewer is not available for this split.
Error code: FeaturesError
Exception: ArrowInvalid
Message: JSON parse error: Invalid value. in row 0
Traceback: Traceback (most recent call last):
File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/json/json.py", line 324, in _generate_tables
df = pandas_read_json(f)
File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/json/json.py", line 38, in pandas_read_json
return pd.read_json(path_or_buf, **kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/pandas/io/json/_json.py", line 815, in read_json
return json_reader.read()
~~~~~~~~~~~~~~~~^^
File "/usr/local/lib/python3.14/site-packages/pandas/io/json/_json.py", line 1014, in read
obj = self._get_object_parser(self.data)
File "/usr/local/lib/python3.14/site-packages/pandas/io/json/_json.py", line 1040, in _get_object_parser
obj = FrameParser(json, **kwargs).parse()
File "/usr/local/lib/python3.14/site-packages/pandas/io/json/_json.py", line 1176, in parse
self._parse()
~~~~~~~~~~~^^
File "/usr/local/lib/python3.14/site-packages/pandas/io/json/_json.py", line 1392, in _parse
ujson_loads(json, precise_float=self.precise_float), dtype=None
~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: Expected object or value
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/src/services/worker/src/worker/job_runners/split/first_rows.py", line 244, in compute_first_rows_from_streaming_response
iterable_dataset = iterable_dataset._resolve_features()
File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 4408, in _resolve_features
features = _infer_features_from_batch(self.with_format(None)._head())
~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 2679, in _head
return next(iter(self.iter(batch_size=n)))
File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 2861, in iter
for key, pa_table in ex_iterable.iter_arrow():
~~~~~~~~~~~~~~~~~~~~~~^^
File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 2395, in _iter_arrow
yield from self.ex_iterable._iter_arrow()
File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 536, in _iter_arrow
for key, pa_table in iterator:
^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 419, in _iter_arrow
for key, pa_table in self.generate_tables_fn(**gen_kwags):
~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/json/json.py", line 327, in _generate_tables
raise e
File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/json/json.py", line 290, in _generate_tables
pa_table = paj.read_json(
io.BytesIO(batch), read_options=paj.ReadOptions(block_size=block_size)
)
File "pyarrow/_json.pyx", line 342, in pyarrow._json.read_json
File "pyarrow/error.pxi", line 155, in pyarrow.lib.pyarrow_internal_check_status
return check_status(status)
File "pyarrow/error.pxi", line 92, in pyarrow.lib.check_status
raise convert_status(status)
pyarrow.lib.ArrowInvalid: JSON parse error: Invalid value. in row 0Need help to make the dataset viewer work? Make sure to review how to configure the dataset viewer, and open a discussion for direct support.
EXEPERT Open Brain Atlas and Simulation Kit
Version 0.1.2. A reproducible educational kit for exploring anatomy, comparing representations and testing an explicitly authored regional propagation rule.
This release contains illustrative simulation parameters, not trained checkpoints or biological human-brain weights. It has no training dataset, loss function, fitted model, diagnostic validation or claim to emulate a person.
Contents
geometry/: pinned Yale atlas and labels; 28 BodyParts3D internal structures; source-specific notices and an integrity manifest.medical-examples/: two small, foreground-masked MRI teaching volumes with exact provenance, affines and transformation metadata. Raw clinical archives are excluded. These examples are independent cases and use different contrasts.simulator/: deterministic TypeScript source and versioned interfaces.simulation-parameters/andsimulation-outputs/: authored settings and a reference output. These are separate from medical examples.lessons/: six chapters at beginner, neuroscience and AI/ML depth.checksums.json: SHA-256 and byte size for every content file (excluding the checksum file itself). Check hashes before loading.
Load and reproduce
With Bun or a TypeScript-capable runtime, import simulate from
./simulator/simulation.ts and load simulation-parameters/baseline.json.
Calling simulate(config) produces the reference rows in
simulation-outputs/baseline.json. The seed, graph, model version, fixed
dt=0.05, 200 steps, coupling, damping and stimulus are all explicit.
Time and activation are dimensionless. The graph is authored, not measured.
Load geometry/yale.glb with a glTF 2 loader. Material names preserve the Yale
parcel IDs; _color is a material suffix, not part of the identifier. Consult
yale-labels.json and retain IDs alongside display labels.
For BodyParts3D, use bodyparts3d.json: offsets are bytes into
bodyparts3d.bin; positions are float32 triples, normals normalized int16
triples, indices uint32. Original structure IDs are retained. Cavity grouping
corrects inherited cardiac categorization of brain ventricles. Geometry is
already in metres and Y-up display coordinates.
MRI .bin files are unsigned uint8 samples in C order: offset (x*Y+y)*Z+z.
The JSON shape, spacingMm and affine are authoritative. Native axes are
reordered to RAS, masked, cropped and sampled at a recorded stride. Intensity
is clipped to recorded percentiles. Do not infer quantitative tissue values
from the display intensities, or assume registration between datasets.
Licenses
- Yale: MIT, copyright Evan Collins, 2021. Full notice in
geometry/YALE-LICENSE.md; pinned revision in the manifest. - BodyParts3D: CC BY 4.0, Database Center for Life Science. License update and
modification details in
geometry/BODYPARTS3D-LICENSE.md. - OpenMind example: original OpenNeuro ds000001 CC0; OpenMind adaptations CC BY 4.0. Attribution: Schonberg, Trepel, Fox, Poldrack and MIC-DKFZ OpenMind. Original dataset DOI: 10.18112/openneuro.ds000001.v1.0.0. Source participant adulthood was checked; no disease-free status is claimed.
- UCSF-PDGM example: CC BY 4.0, UCSF-PDGM investigators and The Cancer Imaging Archive, distributed through Determined AI. See its JSON for selected case, archive revision and input hashes, and the original collection for citations: https://www.cancerimagingarchive.net/collection/ucsf-pdgm/
- EXEPERT-authored simulator and lessons:
LICENSE-SIMULATOR.md(MIT).
CC BY 4.0 terms: https://creativecommons.org/licenses/by/4.0/
BraTS-GLI-Anatomy-Lesion, HCP participant files, TRELLIS and Hunyuan checkpoints are not redistributed. Their references explain related representations and methods. Generated geometry is not required or presented as validated anatomy.
Limitations and intended use
Educational exploration only. Simplified reference anatomy is not an individual clinical assessment. Mesh explosion is a display operation; its gaps are artificial. MRI masks and downsampling introduce information loss. The four-region simulator omits cellular physiology and is not fitted to data. No private EXEPERT repository files, identity-service code or credentials are included. Report problems through the dataset discussion with the release version and source identifier, without sharing personal medical information.
Simulation version compatibility
Version 0.1.2 uses illustrative-regional-v2: integer state and parameters at
1e-6 precision, a fixed 1/20 timestep, and authored positive softsign saturation
x/(1+x). Integer intermediates remain within JavaScript's exact range.
Parameters are rounded to six decimal places before simulation.
The immutable 0.1.0 kit retains the older v1 simulator and its example output.
Its use of platform-dependent Math.tanh can cause tiny numeric differences
between operating systems. Existing v1 exports require that archived simulator;
the current viewer rejects them explicitly instead of silently changing models.
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