Repro - BALLAST (ICML 2026, 0xOj6kVMbb)
Collection
From-scratch reproduction of BALLAST (arXiv 2509.26005): 3/5 claims reproduced, 1 partial, 1 not attempted. • 3 items • Updated
Error code: StreamingRowsError
Exception: CastError
Message: Couldn't cast
rows: list<item: struct<n_space: int64, n_sampT: int64, J: int64, spde_post_s: double, naive_dim: int64, s (... 80 chars omitted)
child 0, item: struct<n_space: int64, n_sampT: int64, J: int64, spde_post_s: double, naive_dim: int64, spde_propaga (... 68 chars omitted)
child 0, n_space: int64
child 1, n_sampT: int64
child 2, J: int64
child 3, spde_post_s: double
child 4, naive_dim: int64
child 5, spde_propagate_s: double
child 6, spde_s: double
child 7, naive_s: double
child 8, naive_cov_gb: double
total_seconds: double
device: string
records: list<item: struct<rep: int64, t: double, u: list<item: list<item: double>>, u_eig: list<item: double (... 48 chars omitted)
child 0, item: struct<rep: int64, t: double, u: list<item: list<item: double>>, u_eig: list<item: double>, u_true: (... 36 chars omitted)
child 0, rep: int64
child 1, t: double
child 2, u: list<item: list<item: double>>
child 0, item: list<item: double>
child 0, item: double
child 3, u_eig: list<item: double>
child 0, item: double
child 4, u_true: list<item: double>
child 0, item: double
child 5, seconds: double
config: struct<mode: string, out: string, seed_lo: int64, seed_hi: int64, n_samples: int64, runs_per_field: (... 281 chars omitted)
child 0, mode: string
child 1, out: string
child 2, seed_lo: int64
child 3, seed_hi: int64
child 4, n_samples: int64
child 5, runs_per_field: int64
child 6, policies: list<item: string>
child 0, item: string
child 7, decision_times: list<item: double>
child 0, item: double
child 8, fields: string
child 9, x_lo: double
child 10, x_hi: double
child 11, y_lo: double
child 12, y_hi: double
child 13, grid_sizes: list<item: int64>
child 0, item: int64
child 14, n_sampT: list<item: int64>
child 0, item: int64
child 15, n_obs: int64
child 16, J: int64
child 17, naive_max_dim: int64
child 18, repeats: int64
child 19, bucket: string
to
{'config': {'mode': Value('string'), 'out': Value('string'), 'seed_lo': Value('int64'), 'seed_hi': Value('int64'), 'n_samples': Value('int64'), 'runs_per_field': Value('int64'), 'policies': List(Value('string')), 'decision_times': List(Value('float64')), 'fields': Value('string'), 'x_lo': Value('float64'), 'x_hi': Value('float64'), 'y_lo': Value('float64'), 'y_hi': Value('float64'), 'grid_sizes': List(Value('int64')), 'n_sampT': List(Value('int64')), 'n_obs': Value('int64'), 'J': Value('int64'), 'naive_max_dim': Value('int64'), 'repeats': Value('int64'), 'bucket': Value('string')}, 'records': List({'rep': Value('int64'), 't': Value('float64'), 'u': List(List(Value('float64'))), 'u_eig': List(Value('float64')), 'u_true': List(Value('float64')), 'seconds': Value('float64')}), 'total_seconds': Value('float64'), 'device': Value('string')}
because column names don't match
Traceback: Traceback (most recent call last):
File "/src/services/worker/src/worker/utils.py", line 147, in get_rows_or_raise
return get_rows(
dataset=dataset,
...<4 lines>...
column_names=column_names,
)
File "/src/libs/libcommon/src/libcommon/utils.py", line 272, in decorator
return func(*args, **kwargs)
File "/src/services/worker/src/worker/utils.py", line 127, in get_rows
rows_plus_one = list(itertools.islice(safe_iter(ds, dataset=dataset), rows_max_number + 1))
File "/src/services/worker/src/worker/utils.py", line 478, in safe_iter
yield from ds.decode(False) if ds.features else ds
File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 2818, in __iter__
for key, example in ex_iterable:
^^^^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 2355, in __iter__
for key, pa_table in self._iter_arrow():
~~~~~~~~~~~~~~~~^^
File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 2380, in _iter_arrow
for key, pa_table in 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 343, in _generate_tables
self._cast_table(pa_table, json_field_paths=json_field_paths),
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/json/json.py", line 132, in _cast_table
pa_table = table_cast(pa_table, self.info.features.arrow_schema)
File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2369, in table_cast
return cast_table_to_schema(table, schema)
File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2297, in cast_table_to_schema
raise CastError(
...<3 lines>...
)
datasets.table.CastError: Couldn't cast
rows: list<item: struct<n_space: int64, n_sampT: int64, J: int64, spde_post_s: double, naive_dim: int64, s (... 80 chars omitted)
child 0, item: struct<n_space: int64, n_sampT: int64, J: int64, spde_post_s: double, naive_dim: int64, spde_propaga (... 68 chars omitted)
child 0, n_space: int64
child 1, n_sampT: int64
child 2, J: int64
child 3, spde_post_s: double
child 4, naive_dim: int64
child 5, spde_propagate_s: double
child 6, spde_s: double
child 7, naive_s: double
child 8, naive_cov_gb: double
total_seconds: double
device: string
records: list<item: struct<rep: int64, t: double, u: list<item: list<item: double>>, u_eig: list<item: double (... 48 chars omitted)
child 0, item: struct<rep: int64, t: double, u: list<item: list<item: double>>, u_eig: list<item: double>, u_true: (... 36 chars omitted)
child 0, rep: int64
child 1, t: double
child 2, u: list<item: list<item: double>>
child 0, item: list<item: double>
child 0, item: double
child 3, u_eig: list<item: double>
child 0, item: double
child 4, u_true: list<item: double>
child 0, item: double
child 5, seconds: double
config: struct<mode: string, out: string, seed_lo: int64, seed_hi: int64, n_samples: int64, runs_per_field: (... 281 chars omitted)
child 0, mode: string
child 1, out: string
child 2, seed_lo: int64
child 3, seed_hi: int64
child 4, n_samples: int64
child 5, runs_per_field: int64
child 6, policies: list<item: string>
child 0, item: string
child 7, decision_times: list<item: double>
child 0, item: double
child 8, fields: string
child 9, x_lo: double
child 10, x_hi: double
child 11, y_lo: double
child 12, y_hi: double
child 13, grid_sizes: list<item: int64>
child 0, item: int64
child 14, n_sampT: list<item: int64>
child 0, item: int64
child 15, n_obs: int64
child 16, J: int64
child 17, naive_max_dim: int64
child 18, repeats: int64
child 19, bucket: string
to
{'config': {'mode': Value('string'), 'out': Value('string'), 'seed_lo': Value('int64'), 'seed_hi': Value('int64'), 'n_samples': Value('int64'), 'runs_per_field': Value('int64'), 'policies': List(Value('string')), 'decision_times': List(Value('float64')), 'fields': Value('string'), 'x_lo': Value('float64'), 'x_hi': Value('float64'), 'y_lo': Value('float64'), 'y_hi': Value('float64'), 'grid_sizes': List(Value('int64')), 'n_sampT': List(Value('int64')), 'n_obs': Value('int64'), 'J': Value('int64'), 'naive_max_dim': Value('int64'), 'repeats': Value('int64'), 'bucket': Value('string')}, 'records': List({'rep': Value('int64'), 't': Value('float64'), 'u': List(List(Value('float64'))), 'u_eig': List(Value('float64')), 'u_true': List(Value('float64')), 'seconds': Value('float64')}), 'total_seconds': Value('float64'), 'device': Value('string')}
because column names don't matchNeed help to make the dataset viewer work? Make sure to review how to configure the dataset viewer, and open a discussion for direct support.
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