Datasets:

birgermoell
/

oellm-longctx-tokenized-natural-128k-256k-pilot-v1

Error code:   StreamingRowsError
Exception:    CastError
Message:      Couldn't cast
created_at_unix: int64
artifact_format: string
source_bin_dir: string
source_mix_dir: string
tokenizer_type: string
tokenizer_model: string
tokenizer_revision: null
vocab_size: int64
megatron_path: string
megatron_git_commit: string
mix: struct<bin_dir: string, suffix: string, alpha: double, floor: double, explicit_weights: string, tota (... 676 chars omitted)
  child 0, bin_dir: string
  child 1, suffix: string
  child 2, alpha: double
  child 3, floor: double
  child 4, explicit_weights: string
  child 5, total_bin_bytes: int64
  child 6, languages: struct<natural_arxiv_full_concat_128k: struct<prefix: string, bin_bytes: int64, natural_p: double, w (... 544 chars omitted)
      child 0, natural_arxiv_full_concat_128k: struct<prefix: string, bin_bytes: int64, natural_p: double, weight: double>
          child 0, prefix: string
          child 1, bin_bytes: int64
          child 2, natural_p: double
          child 3, weight: double
      child 1, natural_arxiv_full_concat_256k: struct<prefix: string, bin_bytes: int64, natural_p: double, weight: double>
          child 0, prefix: string
          child 1, bin_bytes: int64
          child 2, natural_p: double
          child 3, weight: double
      child 2, natural_books_concat_128k: struct<prefix: string, bin_bytes: int64, natural_p: double, weight: double>
          child 0, prefix: string
          child 1, bin_bytes: int64
          child 2, natural_p: double
          child 3, weight: double
      child 3, natural_books_c
...
ld 4, natural_code_repo_pack_128k: struct<prefix: string, bin_bytes: int64, natural_p: double, weight: double>
          child 0, prefix: string
          child 1, bin_bytes: int64
          child 2, natural_p: double
          child 3, weight: double
      child 5, natural_code_repo_pack_256k: struct<prefix: string, bin_bytes: int64, natural_p: double, weight: double>
          child 0, prefix: string
          child 1, bin_bytes: int64
          child 2, natural_p: double
          child 3, weight: double
notes: string
natural_code_repo_pack_256k: struct<prefix: string, bin_mb: double, idx_mb: double>
  child 0, prefix: string
  child 1, bin_mb: double
  child 2, idx_mb: double
natural_books_concat_128k: struct<prefix: string, bin_mb: double, idx_mb: double>
  child 0, prefix: string
  child 1, bin_mb: double
  child 2, idx_mb: double
natural_arxiv_full_concat_128k: struct<prefix: string, bin_mb: double, idx_mb: double>
  child 0, prefix: string
  child 1, bin_mb: double
  child 2, idx_mb: double
natural_books_concat_256k: struct<prefix: string, bin_mb: double, idx_mb: double>
  child 0, prefix: string
  child 1, bin_mb: double
  child 2, idx_mb: double
natural_code_repo_pack_128k: struct<prefix: string, bin_mb: double, idx_mb: double>
  child 0, prefix: string
  child 1, bin_mb: double
  child 2, idx_mb: double
natural_arxiv_full_concat_256k: struct<prefix: string, bin_mb: double, idx_mb: double>
  child 0, prefix: string
  child 1, bin_mb: double
  child 2, idx_mb: double
to
{'natural_arxiv_full_concat_128k': {'prefix': Value('string'), 'bin_mb': Value('float64'), 'idx_mb': Value('float64')}, 'natural_arxiv_full_concat_256k': {'prefix': Value('string'), 'bin_mb': Value('float64'), 'idx_mb': Value('float64')}, 'natural_books_concat_128k': {'prefix': Value('string'), 'bin_mb': Value('float64'), 'idx_mb': Value('float64')}, 'natural_books_concat_256k': {'prefix': Value('string'), 'bin_mb': Value('float64'), 'idx_mb': Value('float64')}, 'natural_code_repo_pack_128k': {'prefix': Value('string'), 'bin_mb': Value('float64'), 'idx_mb': Value('float64')}, 'natural_code_repo_pack_256k': {'prefix': Value('string'), 'bin_mb': Value('float64'), 'idx_mb': Value('float64')}}
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
              created_at_unix: int64
              artifact_format: string
              source_bin_dir: string
              source_mix_dir: string
              tokenizer_type: string
              tokenizer_model: string
              tokenizer_revision: null
              vocab_size: int64
              megatron_path: string
              megatron_git_commit: string
              mix: struct<bin_dir: string, suffix: string, alpha: double, floor: double, explicit_weights: string, tota (... 676 chars omitted)
                child 0, bin_dir: string
                child 1, suffix: string
                child 2, alpha: double
                child 3, floor: double
                child 4, explicit_weights: string
                child 5, total_bin_bytes: int64
                child 6, languages: struct<natural_arxiv_full_concat_128k: struct<prefix: string, bin_bytes: int64, natural_p: double, w (... 544 chars omitted)
                    child 0, natural_arxiv_full_concat_128k: struct<prefix: string, bin_bytes: int64, natural_p: double, weight: double>
                        child 0, prefix: string
                        child 1, bin_bytes: int64
                        child 2, natural_p: double
                        child 3, weight: double
                    child 1, natural_arxiv_full_concat_256k: struct<prefix: string, bin_bytes: int64, natural_p: double, weight: double>
                        child 0, prefix: string
                        child 1, bin_bytes: int64
                        child 2, natural_p: double
                        child 3, weight: double
                    child 2, natural_books_concat_128k: struct<prefix: string, bin_bytes: int64, natural_p: double, weight: double>
                        child 0, prefix: string
                        child 1, bin_bytes: int64
                        child 2, natural_p: double
                        child 3, weight: double
                    child 3, natural_books_c
              ...
              ld 4, natural_code_repo_pack_128k: struct<prefix: string, bin_bytes: int64, natural_p: double, weight: double>
                        child 0, prefix: string
                        child 1, bin_bytes: int64
                        child 2, natural_p: double
                        child 3, weight: double
                    child 5, natural_code_repo_pack_256k: struct<prefix: string, bin_bytes: int64, natural_p: double, weight: double>
                        child 0, prefix: string
                        child 1, bin_bytes: int64
                        child 2, natural_p: double
                        child 3, weight: double
              notes: string
              natural_code_repo_pack_256k: struct<prefix: string, bin_mb: double, idx_mb: double>
                child 0, prefix: string
                child 1, bin_mb: double
                child 2, idx_mb: double
              natural_books_concat_128k: struct<prefix: string, bin_mb: double, idx_mb: double>
                child 0, prefix: string
                child 1, bin_mb: double
                child 2, idx_mb: double
              natural_arxiv_full_concat_128k: struct<prefix: string, bin_mb: double, idx_mb: double>
                child 0, prefix: string
                child 1, bin_mb: double
                child 2, idx_mb: double
              natural_books_concat_256k: struct<prefix: string, bin_mb: double, idx_mb: double>
                child 0, prefix: string
                child 1, bin_mb: double
                child 2, idx_mb: double
              natural_code_repo_pack_128k: struct<prefix: string, bin_mb: double, idx_mb: double>
                child 0, prefix: string
                child 1, bin_mb: double
                child 2, idx_mb: double
              natural_arxiv_full_concat_256k: struct<prefix: string, bin_mb: double, idx_mb: double>
                child 0, prefix: string
                child 1, bin_mb: double
                child 2, idx_mb: double
              to
              {'natural_arxiv_full_concat_128k': {'prefix': Value('string'), 'bin_mb': Value('float64'), 'idx_mb': Value('float64')}, 'natural_arxiv_full_concat_256k': {'prefix': Value('string'), 'bin_mb': Value('float64'), 'idx_mb': Value('float64')}, 'natural_books_concat_128k': {'prefix': Value('string'), 'bin_mb': Value('float64'), 'idx_mb': Value('float64')}, 'natural_books_concat_256k': {'prefix': Value('string'), 'bin_mb': Value('float64'), 'idx_mb': Value('float64')}, 'natural_code_repo_pack_128k': {'prefix': Value('string'), 'bin_mb': Value('float64'), 'idx_mb': Value('float64')}, 'natural_code_repo_pack_256k': {'prefix': Value('string'), 'bin_mb': Value('float64'), 'idx_mb': Value('float64')}}
              because column names don't match

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OELLM Natural Long-Context Tokenized 128K/256K Expanded Pilot

This dataset contains Megatron-LM tokenized continuation-training artifacts for natural long-context extension experiments at 128K and 256K sequence scales.

This public revision expands the original pilot from 128 to 512 packed examples per source/tier, for 3,072 packed examples total. The raw pack manifest reports approximately 586M source-side estimated tokens across all six source/tier shards.

Accessible source streams used for this revision:

edward-io/starcoderdata-repo as repo-packed code fallback
sedthh/gutenberg_multilang for long multilingual book text
allenai/olmo-mix-1124 / arxiv for full paper text

The intended final code source is Stack v2 repository hydration, but that is not included here because gated Stack v2/SWH access was not available on the GPU host at build time.

The artifact layout follows openeuro-longctx-megatron-v1:

bin/: Megatron .bin / .idx files plus tokenization summary
mix/: weighted Megatron --data-path files
manifests/: build metadata, SHA256 checksums, raw pack manifest, and the 512-example recipe

The staged training mix is:

natural_code_repo_pack_128k: 25%
natural_code_repo_pack_256k: 25%
natural_books_concat_128k: 15%
natural_books_concat_256k: 15%
natural_arxiv_full_concat_128k: 10%
natural_arxiv_full_concat_256k: 10%

Each source/tier contains 512 packed examples.

Usage

Download the dataset and use the generated Megatron data path:

python -m longctx.cli artifacts download \
  --repo-id birgermoell/oellm-longctx-tokenized-natural-128k-256k-pilot-v1 \
  --output-dir ./data/oellm-natural-128k-256k-pilot

export DATA_PATH="$(cat ./data/oellm-natural-128k-256k-pilot/mix/data_path.args)"

Pass $DATA_PATH to Megatron with --data-path.

Tokenizer

Built with:

tokenizer type: HuggingFaceTokenizer
tokenizer model: /home/ubuntu/birger/Megatron-Bridge-utils/tokenizers/openeurollm/tokenizer-256k
vocab size: 262144

Source and license note

This is a derived tokenized artifact. Rights and usage constraints follow the upstream datasets and their source documents; this dataset card does not grant additional rights beyond those upstream terms.

Downloads last month: 66

Total file size:

3.06 GB

OELLM Natural Long-Context Tokenized 128K/256K Expanded Pilot

Contents

Usage

Tokenizer

Source and license note