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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
chunks_size: int64
codebase_version: string
data_files_size_in_mb: int64
data_path: string
features: struct<action: struct<dtype: string, names: list<item: string>, shape: list<item: int64>>, episode_i (... 2360 chars omitted)
  child 0, action: struct<dtype: string, names: list<item: string>, shape: list<item: int64>>
      child 0, dtype: string
      child 1, names: list<item: string>
          child 0, item: string
      child 2, shape: list<item: int64>
          child 0, item: int64
  child 1, episode_index: struct<dtype: string, names: null, shape: list<item: int64>>
      child 0, dtype: string
      child 1, names: null
      child 2, shape: list<item: int64>
          child 0, item: int64
  child 2, frame_index: struct<dtype: string, names: null, shape: list<item: int64>>
      child 0, dtype: string
      child 1, names: null
      child 2, shape: list<item: int64>
          child 0, item: int64
  child 3, index: struct<dtype: string, names: null, shape: list<item: int64>>
      child 0, dtype: string
      child 1, names: null
      child 2, shape: list<item: int64>
          child 0, item: int64
  child 4, observation.images.left_wrist: struct<dtype: string, info: struct<has_audio: bool, is_depth_map: bool, video.channels: int64, video (... 293 chars omitted)
      child 0, dtype: string
      child 1, info: struct<has_audio: bool, is_depth_map: bool, video.channels: int64, video.codec: string, video.crf: i (... 211 chars omitted)
          child 0, has_audio: bo
...
t<item: int64>>
      child 0, dtype: string
      child 1, names: null
      child 2, shape: list<item: int64>
          child 0, item: int64
  child 16, task_index: struct<dtype: string, names: null, shape: list<item: int64>>
      child 0, dtype: string
      child 1, names: null
      child 2, shape: list<item: int64>
          child 0, item: int64
  child 17, timestamp: struct<dtype: string, names: null, shape: list<item: int64>>
      child 0, dtype: string
      child 1, names: null
      child 2, shape: list<item: int64>
          child 0, item: int64
fps: int64
robot_type: string
splits: struct<train: string>
  child 0, train: string
total_episodes: int64
total_frames: int64
total_tasks: int64
video_files_size_in_mb: int64
video_path: string
status: string
findings: list<item: struct<changed_frames: int64, episode_index: int64, first_gripper_command_step: int64, in (... 196 chars omitted)
  child 0, item: struct<changed_frames: int64, episode_index: int64, first_gripper_command_step: int64, initial_measu (... 184 chars omitted)
      child 0, changed_frames: int64
      child 1, episode_index: int64
      child 2, first_gripper_command_step: int64
      child 3, initial_measured_gripper: double
      child 4, inspected_pre_grasp_frames: int64
      child 5, observation_values_preserved: bool
      child 6, seed: int64
      child 7, side: string
      child 8, source_index_trace_sha256: string
      child 9, source_program_sha256: string
remaining_stale_labels: int64
to
{'findings': List({'changed_frames': Value('int64'), 'episode_index': Value('int64'), 'first_gripper_command_step': Value('int64'), 'initial_measured_gripper': Value('float64'), 'inspected_pre_grasp_frames': Value('int64'), 'observation_values_preserved': Value('bool'), 'seed': Value('int64'), 'side': Value('string'), 'source_index_trace_sha256': Value('string'), 'source_program_sha256': Value('string')}), 'remaining_stale_labels': Value('int64'), 'status': Value('string')}
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 483, 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 2840, in __iter__
                  for key, example in ex_iterable:
                                      ^^^^^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 2373, in __iter__
                  for key, pa_table in self._iter_arrow():
                                       ~~~~~~~~~~~~~~~~^^
                File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 2398, 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 2378, in table_cast
                  return cast_table_to_schema(table, schema)
                File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2306, in cast_table_to_schema
                  raise CastError(
                  ...<3 lines>...
                  )
              datasets.table.CastError: Couldn't cast
              chunks_size: int64
              codebase_version: string
              data_files_size_in_mb: int64
              data_path: string
              features: struct<action: struct<dtype: string, names: list<item: string>, shape: list<item: int64>>, episode_i (... 2360 chars omitted)
                child 0, action: struct<dtype: string, names: list<item: string>, shape: list<item: int64>>
                    child 0, dtype: string
                    child 1, names: list<item: string>
                        child 0, item: string
                    child 2, shape: list<item: int64>
                        child 0, item: int64
                child 1, episode_index: struct<dtype: string, names: null, shape: list<item: int64>>
                    child 0, dtype: string
                    child 1, names: null
                    child 2, shape: list<item: int64>
                        child 0, item: int64
                child 2, frame_index: struct<dtype: string, names: null, shape: list<item: int64>>
                    child 0, dtype: string
                    child 1, names: null
                    child 2, shape: list<item: int64>
                        child 0, item: int64
                child 3, index: struct<dtype: string, names: null, shape: list<item: int64>>
                    child 0, dtype: string
                    child 1, names: null
                    child 2, shape: list<item: int64>
                        child 0, item: int64
                child 4, observation.images.left_wrist: struct<dtype: string, info: struct<has_audio: bool, is_depth_map: bool, video.channels: int64, video (... 293 chars omitted)
                    child 0, dtype: string
                    child 1, info: struct<has_audio: bool, is_depth_map: bool, video.channels: int64, video.codec: string, video.crf: i (... 211 chars omitted)
                        child 0, has_audio: bo
              ...
              t<item: int64>>
                    child 0, dtype: string
                    child 1, names: null
                    child 2, shape: list<item: int64>
                        child 0, item: int64
                child 16, task_index: struct<dtype: string, names: null, shape: list<item: int64>>
                    child 0, dtype: string
                    child 1, names: null
                    child 2, shape: list<item: int64>
                        child 0, item: int64
                child 17, timestamp: struct<dtype: string, names: null, shape: list<item: int64>>
                    child 0, dtype: string
                    child 1, names: null
                    child 2, shape: list<item: int64>
                        child 0, item: int64
              fps: int64
              robot_type: string
              splits: struct<train: string>
                child 0, train: string
              total_episodes: int64
              total_frames: int64
              total_tasks: int64
              video_files_size_in_mb: int64
              video_path: string
              status: string
              findings: list<item: struct<changed_frames: int64, episode_index: int64, first_gripper_command_step: int64, in (... 196 chars omitted)
                child 0, item: struct<changed_frames: int64, episode_index: int64, first_gripper_command_step: int64, initial_measu (... 184 chars omitted)
                    child 0, changed_frames: int64
                    child 1, episode_index: int64
                    child 2, first_gripper_command_step: int64
                    child 3, initial_measured_gripper: double
                    child 4, inspected_pre_grasp_frames: int64
                    child 5, observation_values_preserved: bool
                    child 6, seed: int64
                    child 7, side: string
                    child 8, source_index_trace_sha256: string
                    child 9, source_program_sha256: string
              remaining_stale_labels: int64
              to
              {'findings': List({'changed_frames': Value('int64'), 'episode_index': Value('int64'), 'first_gripper_command_step': Value('int64'), 'initial_measured_gripper': Value('float64'), 'inspected_pre_grasp_frames': Value('int64'), 'observation_values_preserved': Value('bool'), 'seed': Value('int64'), 'side': Value('string'), 'source_index_trace_sha256': Value('string'), 'source_program_sha256': Value('string')}), 'remaining_stale_labels': Value('int64'), 'status': Value('string')}
              because column names don't match

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Scan Object Sequential50

Q4-A non-CTR Sequential training data containing 50 whole Scan Object episodes: 25 physical L->R schedules and 25 physical R->L schedules. The dataset keeps each frozen training scene seed exactly once. Even source slots select L->R and odd source slots select R->L.

Both parent revisions share the same source program, calibrated centered_fovy90 cameras and scanning-tail control hash for every paired scene. No frame-level trajectory splicing or scene replacement is used.

The two parent MP4 containers for each camera are retained byte-for-byte at separate file indexes. Episode metadata exposes only the selected whole-episode segments. Every selected video frame is decoded during qualification and image statistics are recomputed from exact RGB histograms; no selected frame is transcoded.

IdleMask is disabled. The output drops the parent-only observation.arm_active_mask field and training must not recreate or consume it. Training consumers must compute exact global normalization statistics over valid samples from this immutable output revision.

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