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Cannot extract the features (columns) for the split 'validation' of the config 'default' of the dataset.
Error code:   FeaturesError
Exception:    ArrowInvalid
Message:      Schema at index 1 was different: 
Find all c in Z_3 such that Z_3[x]/(x^2 + c) is a field.: string
0: string
1: string
2: string
3: string
B: string
vs
What is the embryological origin of the hyoid bone?: string
The first pharyngeal arch: string
The first and second pharyngeal arches: string
The second pharyngeal arch: string
The second and third pharyngeal arches: string
D: string
Traceback:    Traceback (most recent call last):
                File "/src/services/worker/src/worker/job_runners/split/first_rows.py", line 243, 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 4379, 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 2661, in _head
                  return next(iter(self.iter(batch_size=n)))
                File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 2839, in iter
                  for key, pa_table in ex_iterable.iter_arrow():
                                       ~~~~~~~~~~~~~~~~~~~~~~^^
                File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 2377, in _iter_arrow
                  yield from self.ex_iterable._iter_arrow()
                File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 580, in _iter_arrow
                  yield new_key, pa.Table.from_batches(chunks_buffer)
                                 ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
                File "pyarrow/table.pxi", line 5039, in pyarrow.lib.Table.from_batches
                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: Schema at index 1 was different: 
              Find all c in Z_3 such that Z_3[x]/(x^2 + c) is a field.: string
              0: string
              1: string
              2: string
              3: string
              B: string
              vs
              What is the embryological origin of the hyoid bone?: string
              The first pharyngeal arch: string
              The first and second pharyngeal arches: string
              The second pharyngeal arch: string
              The second and third pharyngeal arches: string
              D: string

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MMLU — evaluation data (OpenCompass format)

Bud Ecosystem eval mirror. OpenCompass-native eval data for MMLU, laid out at mmlu/ exactly as the OpenCompass dataset loader expects. Sourced from the OpenCompass data distribution; license MIT, unchanged; all rights remain with the original authors.

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