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Cannot load the dataset split (in streaming mode) to extract the first rows.
Error code:   StreamingRowsError
Exception:    CastError
Message:      Couldn't cast
example_id: int64
prompt: list<item: struct<role: string, content: string>>
  child 0, item: struct<role: string, content: string>
      child 0, role: string
      child 1, content: string
completion: list<item: struct<role: string, content: string, tool_calls: list<item: struct<id: string, type: str (... 80 chars omitted)
  child 0, item: struct<role: string, content: string, tool_calls: list<item: struct<id: string, type: string, functi (... 68 chars omitted)
      child 0, role: string
      child 1, content: string
      child 2, tool_calls: list<item: struct<id: string, type: string, function: struct<name: string, arguments: string>>>
          child 0, item: struct<id: string, type: string, function: struct<name: string, arguments: string>>
              child 0, id: string
              child 1, type: string
              child 2, function: struct<name: string, arguments: string>
                  child 0, name: string
                  child 1, arguments: string
      child 3, tool_call_id: string
info: struct<task_id: string, task_name: string, rollout_name: string, environment: string, agent: string, (... 123 chars omitted)
  child 0, task_id: string
  child 1, task_name: string
  child 2, rollout_name: string
  child 3, environment: string
  child 4, agent: string
  child 5, agent_name: string
  child 6, model: string
  child 7, source: string
  child 8, rollout_dir: string
  child 9, training_ready: bool
  child 10, training_ready_reason: null
reward: double
erro
...
ens: null
                  child 1, audio_tokens: null
                  child 2, reasoning_tokens: int64
                  child 3, rejected_prediction_tokens: null
                  child 4, text_tokens: int64
                  child 5, image_tokens: null
                  child 6, video_tokens: null
              child 4, prompt_tokens_details: struct<audio_tokens: null, cache_write_tokens: null, cached_tokens: int64, text_tokens: int64, image (... 64 chars omitted)
                  child 0, audio_tokens: null
                  child 1, cache_write_tokens: null
                  child 2, cached_tokens: int64
                  child 3, text_tokens: int64
                  child 4, image_tokens: null
                  child 5, video_tokens: null
                  child 6, cache_creation_tokens: int64
              child 5, cache_creation_input_tokens: int64
              child 6, cache_read_input_tokens: int64
      child 3, tokens: null
      child 4, reward: double
      child 5, advantage: double
      child 6, is_truncated: bool
      child 7, trajectory_id: string
      child 8, extras: struct<source: string, tracking_source: string, exchange_index: int64>
          child 0, source: string
          child 1, tracking_source: string
          child 2, exchange_index: int64
content: null
details: struct<task_id: string, environment: string, model: string>
  child 0, task_id: string
  child 1, environment: string
  child 2, model: string
schema_version: string
id: string
to
{'schema_version': Value('string'), 'id': Value('string'), 'content': List(Json(decode=True)), 'details': {'task_id': Value('string'), 'environment': Value('string'), 'model': Value('string')}}
because column names don't match
Traceback:    Traceback (most recent call last):
                File "/src/services/worker/src/worker/utils.py", line 149, 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 129, 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 489, 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
              example_id: int64
              prompt: list<item: struct<role: string, content: string>>
                child 0, item: struct<role: string, content: string>
                    child 0, role: string
                    child 1, content: string
              completion: list<item: struct<role: string, content: string, tool_calls: list<item: struct<id: string, type: str (... 80 chars omitted)
                child 0, item: struct<role: string, content: string, tool_calls: list<item: struct<id: string, type: string, functi (... 68 chars omitted)
                    child 0, role: string
                    child 1, content: string
                    child 2, tool_calls: list<item: struct<id: string, type: string, function: struct<name: string, arguments: string>>>
                        child 0, item: struct<id: string, type: string, function: struct<name: string, arguments: string>>
                            child 0, id: string
                            child 1, type: string
                            child 2, function: struct<name: string, arguments: string>
                                child 0, name: string
                                child 1, arguments: string
                    child 3, tool_call_id: string
              info: struct<task_id: string, task_name: string, rollout_name: string, environment: string, agent: string, (... 123 chars omitted)
                child 0, task_id: string
                child 1, task_name: string
                child 2, rollout_name: string
                child 3, environment: string
                child 4, agent: string
                child 5, agent_name: string
                child 6, model: string
                child 7, source: string
                child 8, rollout_dir: string
                child 9, training_ready: bool
                child 10, training_ready_reason: null
              reward: double
              erro
              ...
              ens: null
                                child 1, audio_tokens: null
                                child 2, reasoning_tokens: int64
                                child 3, rejected_prediction_tokens: null
                                child 4, text_tokens: int64
                                child 5, image_tokens: null
                                child 6, video_tokens: null
                            child 4, prompt_tokens_details: struct<audio_tokens: null, cache_write_tokens: null, cached_tokens: int64, text_tokens: int64, image (... 64 chars omitted)
                                child 0, audio_tokens: null
                                child 1, cache_write_tokens: null
                                child 2, cached_tokens: int64
                                child 3, text_tokens: int64
                                child 4, image_tokens: null
                                child 5, video_tokens: null
                                child 6, cache_creation_tokens: int64
                            child 5, cache_creation_input_tokens: int64
                            child 6, cache_read_input_tokens: int64
                    child 3, tokens: null
                    child 4, reward: double
                    child 5, advantage: double
                    child 6, is_truncated: bool
                    child 7, trajectory_id: string
                    child 8, extras: struct<source: string, tracking_source: string, exchange_index: int64>
                        child 0, source: string
                        child 1, tracking_source: string
                        child 2, exchange_index: int64
              content: null
              details: struct<task_id: string, environment: string, model: string>
                child 0, task_id: string
                child 1, environment: string
                child 2, model: string
              schema_version: string
              id: string
              to
              {'schema_version': Value('string'), 'id': Value('string'), 'content': List(Json(decode=True)), 'details': {'task_id': Value('string'), 'environment': Value('string'), 'model': Value('string')}}
              because column names don't match

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