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The dataset generation failed
Error code:   DatasetGenerationError
Exception:    TypeError
Message:      Couldn't cast array of type string to null
Traceback:    Traceback (most recent call last):
                File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1816, in _prepare_split_single
                  for key, table in generator:
                                    ^^^^^^^^^
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 613, in wrapped
                  for item in generator(*args, **kwargs):
                              ~~~~~~~~~^^^^^^^^^^^^^^^^^
                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 2303, in cast_table_to_schema
                  cast_array_to_feature(
                  ~~~~~~~~~~~~~~~~~~~~~^
                      table[name] if name in table_column_names else pa.array([None] * len(table), type=schema.field(name).type),
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                      feature,
                      ^^^^^^^^
                  )
                  ^
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 1852, in wrapper
                  return pa.chunked_array([func(chunk, *args, **kwargs) for chunk in array.chunks])
                                           ~~~~^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2109, in cast_array_to_feature
                  casted_array_values = _c(array.values, feature.feature)
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 1854, in wrapper
                  return func(array, *args, **kwargs)
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2059, in cast_array_to_feature
                  _c(array.field(name) if name in array_fields else null_array, subfeature)
                  ~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 1854, in wrapper
                  return func(array, *args, **kwargs)
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2143, in cast_array_to_feature
                  return array_cast(
                      array,
                  ...<2 lines>...
                      allow_decimal_to_str=allow_decimal_to_str,
                  )
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 1854, in wrapper
                  return func(array, *args, **kwargs)
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2005, in array_cast
                  raise TypeError(f"Couldn't cast array of type {_short_str(array.type)} to {_short_str(pa_type)}")
              TypeError: Couldn't cast array of type string to null
              
              The above exception was the direct cause of the following exception:
              
              Traceback (most recent call last):
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 1369, in compute_config_parquet_and_info_response
                  parquet_operations, partial, estimated_dataset_info = stream_convert_to_parquet(
                                                                        ~~~~~~~~~~~~~~~~~~~~~~~~~^
                      builder, max_dataset_size_bytes=max_dataset_size_bytes
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                  )
                  ^
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 948, in stream_convert_to_parquet
                  builder._prepare_split(split_generator=splits_generators[split], file_format="parquet")
                  ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1683, in _prepare_split
                  for job_id, done, content in self._prepare_split_single(
                                               ~~~~~~~~~~~~~~~~~~~~~~~~~~^
                      gen_kwargs=gen_kwargs, job_id=job_id, **_prepare_split_args
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                  ):
                  ^
                File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1869, in _prepare_split_single
                  raise DatasetGenerationError("An error occurred while generating the dataset") from e
              datasets.exceptions.DatasetGenerationError: An error occurred while generating the dataset

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schema_version
int64
task_id
string
test_index
int64
gold
list
identity_exact
bool
nested
dict
candidates
list
model_sha256
string
2
00576224
0
[ [ 3, 2, 3, 2, 3, 2 ], [ 7, 8, 7, 8, 7, 8 ], [ 2, 3, 2, 3, 2, 3 ], [ 8, 7, 8, 7, 8, 7 ], [ 3, 2, 3, 2, 3, 2 ], [ 7, 8, 7, 8, 7, 8 ] ]
false
{ "14": { "logical_candidates": 14, "valid_candidates": 14, "distinct_predictions": 6, "top2_predictions": [ [ [ 3, 2, 3, 2 ], [ 7, 8, 7, 8 ], [ 3, 2, ...
[ { "candidate_index": 0, "spatial_index": 0, "spatial": "identity", "transform": "identity", "color_index": 0, "color_mapping": [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ], "order_index": 0, "permutation": 0, "demo_order": [ ...
5fd2d8c8f320be3debec07a1008d38e038e3c3401fdb292255dfc0b48bc77b43
2
009d5c81
0
[[0,0,0,0,0,0,0,0,0,0,0,0,0,0],[0,0,0,0,0,7,7,7,7,7,7,7,7,7],[0,0,0,0,0,7,0,0,0,7,0,7,0,7],[0,0,0,0,(...TRUNCATED)
false
{"14":{"logical_candidates":14,"valid_candidates":14,"distinct_predictions":2,"top2_predictions":[[[(...TRUNCATED)
[{"candidate_index":0,"spatial_index":0,"spatial":"identity","transform":"identity","color_index":0,(...TRUNCATED)
5fd2d8c8f320be3debec07a1008d38e038e3c3401fdb292255dfc0b48bc77b43
2
00dbd492
0
[[0,0,0,0,0,0,0,0,0,0,0,2,2,2,2,2,0,0,0,0],[0,2,2,2,2,2,2,2,2,2,0,2,8,8,8,2,0,0,0,0],[0,2,3,3,3,3,3,(...TRUNCATED)
false
{"14":{"logical_candidates":14,"valid_candidates":14,"distinct_predictions":2,"top2_predictions":[[[(...TRUNCATED)
[{"candidate_index":0,"spatial_index":0,"spatial":"identity","transform":"identity","color_index":0,(...TRUNCATED)
5fd2d8c8f320be3debec07a1008d38e038e3c3401fdb292255dfc0b48bc77b43
2
03560426
0
[[7,0,0,0,0,0,0,0,0,0],[7,0,0,0,0,0,0,0,0,0],[7,0,0,0,0,0,0,0,0,0],[8,8,0,0,0,0,0,0,0,0],[8,8,0,0,0,(...TRUNCATED)
false
{"14":{"logical_candidates":14,"valid_candidates":14,"distinct_predictions":10,"top2_predictions":[[(...TRUNCATED)
[{"candidate_index":0,"spatial_index":0,"spatial":"identity","transform":"identity","color_index":0,(...TRUNCATED)
5fd2d8c8f320be3debec07a1008d38e038e3c3401fdb292255dfc0b48bc77b43
2
05a7bcf2
0
[[0,0,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,8,0,0,0,0,0,0,0,0,0,0],[2,2,2,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,(...TRUNCATED)
false
{"14":{"logical_candidates":14,"valid_candidates":14,"distinct_predictions":7,"top2_predictions":[[[(...TRUNCATED)
[{"candidate_index":0,"spatial_index":0,"spatial":"identity","transform":"identity","color_index":0,(...TRUNCATED)
5fd2d8c8f320be3debec07a1008d38e038e3c3401fdb292255dfc0b48bc77b43
2
0607ce86
0
[[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],[0,2,2,8,2,2,0,2,2,8,2,2,0,2,2,8,2,2,0,0,0,0],[0,3,3,(...TRUNCATED)
false
{"14":{"logical_candidates":14,"valid_candidates":14,"distinct_predictions":10,"top2_predictions":[[(...TRUNCATED)
[{"candidate_index":0,"spatial_index":0,"spatial":"identity","transform":"identity","color_index":0,(...TRUNCATED)
5fd2d8c8f320be3debec07a1008d38e038e3c3401fdb292255dfc0b48bc77b43
2
0692e18c
0
[[0,0,0,0,0,0,3,3,0],[0,0,0,0,0,0,0,0,3],[0,0,0,0,0,0,3,0,3],[3,3,0,3,3,0,0,0,0],[0,0,3,0,0,3,0,0,0](...TRUNCATED)
false
{"14":{"logical_candidates":14,"valid_candidates":14,"distinct_predictions":1,"top2_predictions":[[[(...TRUNCATED)
[{"candidate_index":0,"spatial_index":0,"spatial":"identity","transform":"identity","color_index":0,(...TRUNCATED)
5fd2d8c8f320be3debec07a1008d38e038e3c3401fdb292255dfc0b48bc77b43
2
070dd51e
0
[[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],[0,0,0,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],[0,0,0,3,0,0,0,(...TRUNCATED)
true
{"14":{"logical_candidates":14,"valid_candidates":14,"distinct_predictions":2,"top2_predictions":[[[(...TRUNCATED)
[{"candidate_index":0,"spatial_index":0,"spatial":"identity","transform":"identity","color_index":0,(...TRUNCATED)
5fd2d8c8f320be3debec07a1008d38e038e3c3401fdb292255dfc0b48bc77b43
2
08573cc6
0
[[0,0,0,0,0,0,0,0,0,0,0,0,8],[2,2,2,2,2,2,2,2,2,2,8,0,8],[8,0,0,0,0,0,0,0,0,0,8,0,8],[8,0,2,2,2,2,2,(...TRUNCATED)
false
{"14":{"logical_candidates":14,"valid_candidates":14,"distinct_predictions":8,"top2_predictions":[[[(...TRUNCATED)
[{"candidate_index":0,"spatial_index":0,"spatial":"identity","transform":"identity","color_index":0,(...TRUNCATED)
5fd2d8c8f320be3debec07a1008d38e038e3c3401fdb292255dfc0b48bc77b43
2
0934a4d8
0
[ [ 7, 7, 9 ], [ 7, 2, 9 ], [ 7, 2, 9 ], [ 7, 7, 9 ], [ 4, 4, 7 ], [ 4, 4, 7 ], [ 6, 6, 1 ], [ 6, 6, 6 ], [ 1, 6, 1 ] ]
false
{"14":{"logical_candidates":14,"valid_candidates":14,"distinct_predictions":11,"top2_predictions":[[(...TRUNCATED)
[{"candidate_index":0,"spatial_index":0,"spatial":"identity","transform":"identity","color_index":0,(...TRUNCATED)
5fd2d8c8f320be3debec07a1008d38e038e3c3401fdb292255dfc0b48bc77b43
End of preview.

ARC Tiny Transformer data

Data and vote-level artifacts for N8python/arc-tiny-transformer.

Corpus

corpus/documents_3k_per_task.jsonl.zst is the exact pretraining corpus:

  • 1,200,000 JSONL documents;
  • 3,000 documents for each of 400 RE-ARC generator families;
  • 3,401,127,124 ARC tokens;
  • 10,413,648,837 uncompressed bytes;
  • uncompressed SHA-256 5d1336f8d6f45358a377af2e3fd05d43c4bfe91621b0c6a44c53dad0e34ca430.

Each record contains token IDs and metadata for task ID, sampled difficulty band, demonstration count, rejection statistics, and generation seed. The fixed vocabulary and sampler are in the GitHub repository. manifests/ contains the complete task-level corpus provenance.

Evaluation artifacts

artifacts/ contains the full 128-candidate records for:

  • the frozen 50M model;
  • TTT replicas seeded 57, 58, and 59;
  • the 7M TTT run.

These files are sufficient to recompute rank-1, raw-frequency top-2, historical hierarchical top-2, oracle accuracy, candidate-scaling curves, and multi-replica ensembles without rerunning model inference.

viewer/data/ contains the compact per-query data backing the browser-based 384-candidate explorer.

Licensing note

Release code and metadata are MIT licensed. The corpus is procedurally generated with the pinned RE-ARC generators/verifiers; ARC-AGI task files are not duplicated here. Users should also review the upstream RE-ARC and ARC-AGI licenses for their use case.

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