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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
round: int64
full_diff: string
incremental_diff: string
modified_files: struct<>
timestamp: int64
tournament_id: string
round_stats: struct<0: struct<round_num: int64, winner: string, details: list<item: string>, scores: struct<devch (... 1010 chars omitted)
  child 0, 0: struct<round_num: int64, winner: string, details: list<item: string>, scores: struct<devchris__first (... 263 chars omitted)
      child 0, round_num: int64
      child 1, winner: string
      child 2, details: list<item: string>
          child 0, item: string
      child 3, scores: struct<devchris__first_test: double, gemini-3-5-flash: int64>
          child 0, devchris__first_test: double
          child 1, gemini-3-5-flash: int64
      child 4, player_stats: struct<gemini-3-5-flash: struct<name: string, invalid_reason: string, score: int64, valid_submit: bo (... 107 chars omitted)
          child 0, gemini-3-5-flash: struct<name: string, invalid_reason: string, score: int64, valid_submit: bool>
              child 0, name: string
              child 1, invalid_reason: string
              child 2, score: int64
              child 3, valid_submit: bool
          child 1, devchris__first_test: struct<name: string, invalid_reason: string, score: double, valid_submit: bool>
              child 0, name: string
              child 1, invalid_reason: string
              child 2, score: double
              child 3, valid_submit: bool
  child 1, 1: struct<round_num: int64, winner: string, details: list<item: st
...
        child 0, model_name: string
                  child 1, cost_tracking: string
                  child 2, model_kwargs: struct<drop_params: bool, api_base: string, custom_llm_provider: string, api_key: string>
                      child 0, drop_params: bool
                      child 1, api_base: string
                      child 2, custom_llm_provider: string
                      child 3, api_key: string
                  child 3, observation_template: string
          child 6, push: bool
          child 7, branch: string
      child 4, initial_commit_hash: string
      child 5, branch_name: string
      child 6, round_tags: struct<0: string, 1: string, 2: string>
          child 0, 0: string
          child 1, 1: string
          child 2, 2: string
      child 7, agent_stats: struct<1: struct<exit_status: string, cost: double, api_calls: int64>, 2: struct<exit_status: string (... 34 chars omitted)
          child 0, 1: struct<exit_status: string, cost: double, api_calls: int64>
              child 0, exit_status: string
              child 1, cost: double
              child 2, api_calls: int64
          child 1, 2: struct<exit_status: string, cost: double, api_calls: int64>
              child 0, exit_status: string
              child 1, cost: double
              child 2, api_calls: int64
name: string
ladder_advancement: struct<player_wins: int64, won_last_k: bool, cleared: bool>
  child 0, player_wins: int64
  child 1, won_last_k: bool
  child 2, cleared: bool
to
{'name': Value('string'), 'tournament_id': Value('string'), 'config': {'tournament': {'rounds': Value('int64')}, 'game': {'name': Value('string'), 'sims_per_round': Value('int64'), 'args': {'raw': Value('bool')}}, 'prompts': {'game_description': Value('string')}, 'players': List({'agent': Value('string'), 'name': Value('string'), 'config': {'agent': {'system_template': Value('string'), 'instance_template': Value('string'), 'step_limit': Value('int64'), 'cost_limit': Value('int64')}, 'model': {'model_name': Value('string'), 'cost_tracking': Value('string'), 'model_kwargs': {'drop_params': Value('bool'), 'api_base': Value('string'), 'custom_llm_provider': Value('string'), 'api_key': Value('string')}, 'observation_template': Value('string')}}, 'push': Value('bool'), 'branch': Value('string'), 'commit_label': Value('string'), 'branch_init': Value('string'), 'elo': Value('float64')})}, 'created_timestamp': Value('int64'), 'aws': {}, 'round_stats': {'0': {'round_num': Value('int64'), 'winner': Value('string'), 'details': List(Value('string')), 'scores': {'devchris__first_test': Value('float64'), 'gemini-3-5-flash': Value('int64')}, 'player_stats': {'gemini-3-5-flash': {'name': Value('string'), 'invalid_reason': Value('string'), 'score': Value('int64'), 'valid_submit': Value('bool')}, 'devchris__first_test': {'name': Value('string'), 'invalid_reason': Value('string'), 'score': Value('float64'), 'valid_submit': Value('bool')}}}, '1': {'round_num': Value('int64'), 'winner': Value('str
...
lid_reason': Value('string'), 'score': Value('int64'), 'valid_submit': Value('bool')}}}}, 'game': {'name': Value('string'), 'config': {'name': Value('string'), 'sims_per_round': Value('int64'), 'args': {'raw': Value('bool')}}, 'game_id': Value('string'), 'created_timestamp': Value('int64')}, 'agents': List({'name': Value('string'), 'player_unique_id': Value('string'), 'created_timestamp': Value('int64'), 'config': {'agent': Value('string'), 'branch_init': Value('string'), 'elo': Value('float64'), 'name': Value('string'), 'commit_label': Value('string'), 'config': {'agent': {'system_template': Value('string'), 'instance_template': Value('string'), 'step_limit': Value('int64'), 'cost_limit': Value('int64')}, 'model': {'model_name': Value('string'), 'cost_tracking': Value('string'), 'model_kwargs': {'drop_params': Value('bool'), 'api_base': Value('string'), 'custom_llm_provider': Value('string'), 'api_key': Value('string')}, 'observation_template': Value('string')}}, 'push': Value('bool'), 'branch': Value('string')}, 'initial_commit_hash': Value('string'), 'branch_name': Value('string'), 'round_tags': {'0': Value('string'), '1': Value('string'), '2': Value('string')}, 'agent_stats': {'1': {'exit_status': Value('string'), 'cost': Value('float64'), 'api_calls': Value('int64')}, '2': {'exit_status': Value('string'), 'cost': Value('float64'), 'api_calls': Value('int64')}}}), 'ladder_advancement': {'player_wins': Value('int64'), 'won_last_k': Value('bool'), 'cleared': Value('bool')}}
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
              round: int64
              full_diff: string
              incremental_diff: string
              modified_files: struct<>
              timestamp: int64
              tournament_id: string
              round_stats: struct<0: struct<round_num: int64, winner: string, details: list<item: string>, scores: struct<devch (... 1010 chars omitted)
                child 0, 0: struct<round_num: int64, winner: string, details: list<item: string>, scores: struct<devchris__first (... 263 chars omitted)
                    child 0, round_num: int64
                    child 1, winner: string
                    child 2, details: list<item: string>
                        child 0, item: string
                    child 3, scores: struct<devchris__first_test: double, gemini-3-5-flash: int64>
                        child 0, devchris__first_test: double
                        child 1, gemini-3-5-flash: int64
                    child 4, player_stats: struct<gemini-3-5-flash: struct<name: string, invalid_reason: string, score: int64, valid_submit: bo (... 107 chars omitted)
                        child 0, gemini-3-5-flash: struct<name: string, invalid_reason: string, score: int64, valid_submit: bool>
                            child 0, name: string
                            child 1, invalid_reason: string
                            child 2, score: int64
                            child 3, valid_submit: bool
                        child 1, devchris__first_test: struct<name: string, invalid_reason: string, score: double, valid_submit: bool>
                            child 0, name: string
                            child 1, invalid_reason: string
                            child 2, score: double
                            child 3, valid_submit: bool
                child 1, 1: struct<round_num: int64, winner: string, details: list<item: st
              ...
                      child 0, model_name: string
                                child 1, cost_tracking: string
                                child 2, model_kwargs: struct<drop_params: bool, api_base: string, custom_llm_provider: string, api_key: string>
                                    child 0, drop_params: bool
                                    child 1, api_base: string
                                    child 2, custom_llm_provider: string
                                    child 3, api_key: string
                                child 3, observation_template: string
                        child 6, push: bool
                        child 7, branch: string
                    child 4, initial_commit_hash: string
                    child 5, branch_name: string
                    child 6, round_tags: struct<0: string, 1: string, 2: string>
                        child 0, 0: string
                        child 1, 1: string
                        child 2, 2: string
                    child 7, agent_stats: struct<1: struct<exit_status: string, cost: double, api_calls: int64>, 2: struct<exit_status: string (... 34 chars omitted)
                        child 0, 1: struct<exit_status: string, cost: double, api_calls: int64>
                            child 0, exit_status: string
                            child 1, cost: double
                            child 2, api_calls: int64
                        child 1, 2: struct<exit_status: string, cost: double, api_calls: int64>
                            child 0, exit_status: string
                            child 1, cost: double
                            child 2, api_calls: int64
              name: string
              ladder_advancement: struct<player_wins: int64, won_last_k: bool, cleared: bool>
                child 0, player_wins: int64
                child 1, won_last_k: bool
                child 2, cleared: bool
              to
              {'name': Value('string'), 'tournament_id': Value('string'), 'config': {'tournament': {'rounds': Value('int64')}, 'game': {'name': Value('string'), 'sims_per_round': Value('int64'), 'args': {'raw': Value('bool')}}, 'prompts': {'game_description': Value('string')}, 'players': List({'agent': Value('string'), 'name': Value('string'), 'config': {'agent': {'system_template': Value('string'), 'instance_template': Value('string'), 'step_limit': Value('int64'), 'cost_limit': Value('int64')}, 'model': {'model_name': Value('string'), 'cost_tracking': Value('string'), 'model_kwargs': {'drop_params': Value('bool'), 'api_base': Value('string'), 'custom_llm_provider': Value('string'), 'api_key': Value('string')}, 'observation_template': Value('string')}}, 'push': Value('bool'), 'branch': Value('string'), 'commit_label': Value('string'), 'branch_init': Value('string'), 'elo': Value('float64')})}, 'created_timestamp': Value('int64'), 'aws': {}, 'round_stats': {'0': {'round_num': Value('int64'), 'winner': Value('string'), 'details': List(Value('string')), 'scores': {'devchris__first_test': Value('float64'), 'gemini-3-5-flash': Value('int64')}, 'player_stats': {'gemini-3-5-flash': {'name': Value('string'), 'invalid_reason': Value('string'), 'score': Value('int64'), 'valid_submit': Value('bool')}, 'devchris__first_test': {'name': Value('string'), 'invalid_reason': Value('string'), 'score': Value('float64'), 'valid_submit': Value('bool')}}}, '1': {'round_num': Value('int64'), 'winner': Value('str
              ...
              lid_reason': Value('string'), 'score': Value('int64'), 'valid_submit': Value('bool')}}}}, 'game': {'name': Value('string'), 'config': {'name': Value('string'), 'sims_per_round': Value('int64'), 'args': {'raw': Value('bool')}}, 'game_id': Value('string'), 'created_timestamp': Value('int64')}, 'agents': List({'name': Value('string'), 'player_unique_id': Value('string'), 'created_timestamp': Value('int64'), 'config': {'agent': Value('string'), 'branch_init': Value('string'), 'elo': Value('float64'), 'name': Value('string'), 'commit_label': Value('string'), 'config': {'agent': {'system_template': Value('string'), 'instance_template': Value('string'), 'step_limit': Value('int64'), 'cost_limit': Value('int64')}, 'model': {'model_name': Value('string'), 'cost_tracking': Value('string'), 'model_kwargs': {'drop_params': Value('bool'), 'api_base': Value('string'), 'custom_llm_provider': Value('string'), 'api_key': Value('string')}, 'observation_template': Value('string')}}, 'push': Value('bool'), 'branch': Value('string')}, 'initial_commit_hash': Value('string'), 'branch_name': Value('string'), 'round_tags': {'0': Value('string'), '1': Value('string'), '2': Value('string')}, 'agent_stats': {'1': {'exit_status': Value('string'), 'cost': Value('float64'), 'api_calls': Value('int64')}, '2': {'exit_status': Value('string'), 'cost': Value('float64'), 'api_calls': Value('int64')}}}), 'ladder_advancement': {'player_wins': Value('int64'), 'won_last_k': Value('bool'), 'cleared': Value('bool')}}
              because column names don't match

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