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The dataset generation failed because of a cast error
Error code: DatasetGenerationCastError
Exception: DatasetGenerationCastError
Message: An error occurred while generating the dataset
All the data files must have the same columns, but at some point there are 9 new columns ({'left_exposure_us', 'right_exposure_start_us', 'left_exposure_start_us', 'frame', 'start_delta_us', 'left_frame_interval_us', 'recording', 'right_exposure_us', 'centre_delta_us'}) and 5 missing columns ({'pairs_used', 'residual_median_deg', 'offset_ms', 'angle_to_factory_deg', 'pairs_total'}).
This happened while the csv dataset builder was generating data using
gzip://a2_frame_timestamps.csv::hf://datasets/origin-data-lab/stereo-imu-timestamp-integrity-camera-imu-alignment@2a705545cbff9ff556399047799ee9e64e95b387/a2_frame_timestamps.csv.gz, ['hf://datasets/origin-data-lab/stereo-imu-timestamp-integrity-camera-imu-alignment@2a705545cbff9ff556399047799ee9e64e95b387/a2_camimu_offset_curve.csv', 'hf://datasets/origin-data-lab/stereo-imu-timestamp-integrity-camera-imu-alignment@2a705545cbff9ff556399047799ee9e64e95b387/a2_frame_timestamps.csv.gz', 'hf://datasets/origin-data-lab/stereo-imu-timestamp-integrity-camera-imu-alignment@2a705545cbff9ff556399047799ee9e64e95b387/a2_timestamp_integrity.csv']
Please either edit the data files to have matching columns, or separate them into different configurations (see docs at https://hf.co/docs/hub/datasets-manual-configuration#multiple-configurations)
Traceback: Traceback (most recent call last):
File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1856, in _prepare_split_single
writer.write_table(table)
~~~~~~~~~~~~~~~~~~^^^^^^^
File "/usr/local/lib/python3.14/site-packages/datasets/arrow_writer.py", line 811, in write_table
self._write_table(pa_table, writer_batch_size=writer_batch_size)
~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/datasets/arrow_writer.py", line 822, in _write_table
pa_table = table_cast(pa_table, self._schema)
File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2381, in table_cast
return cast_table_to_schema(table, schema)
File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2309, in cast_table_to_schema
raise CastError(
...<3 lines>...
)
datasets.table.CastError: Couldn't cast
recording: string
frame: int64
left_exposure_start_us: int64
right_exposure_start_us: int64
left_exposure_us: int64
right_exposure_us: int64
start_delta_us: int64
centre_delta_us: double
left_frame_interval_us: double
-- schema metadata --
pandas: '{"index_columns": [{"kind": "range", "name": null, "start": 0, "' + 1451
to
{'offset_ms': Value('float64'), 'residual_median_deg': Value('float64'), 'pairs_used': Value('int64'), 'pairs_total': Value('int64'), 'angle_to_factory_deg': Value('float64')}
because column names don't match
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 1379, in compute_config_parquet_and_info_response
parquet_operations, partial, estimated_dataset_info = stream_convert_to_parquet(
~~~~~~~~~~~~~~~~~~~~~~~~~^
builder, max_dataset_size_bytes=max_dataset_size_bytes
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
)
^
File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 956, in stream_convert_to_parquet
builder._prepare_split(split_generator=splits_generators[split], file_format="parquet")
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1702, in _prepare_split
for job_id, done, content in self._prepare_split_single(
~~~~~~~~~~~~~~~~~~~~~~~~~~^
gen_kwargs=gen_kwargs, job_id=job_id, **_prepare_split_args
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
):
^
File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1858, in _prepare_split_single
raise DatasetGenerationCastError.from_cast_error(
...<4 lines>...
)
datasets.exceptions.DatasetGenerationCastError: An error occurred while generating the dataset
All the data files must have the same columns, but at some point there are 9 new columns ({'left_exposure_us', 'right_exposure_start_us', 'left_exposure_start_us', 'frame', 'start_delta_us', 'left_frame_interval_us', 'recording', 'right_exposure_us', 'centre_delta_us'}) and 5 missing columns ({'pairs_used', 'residual_median_deg', 'offset_ms', 'angle_to_factory_deg', 'pairs_total'}).
This happened while the csv dataset builder was generating data using
gzip://a2_frame_timestamps.csv::hf://datasets/origin-data-lab/stereo-imu-timestamp-integrity-camera-imu-alignment@2a705545cbff9ff556399047799ee9e64e95b387/a2_frame_timestamps.csv.gz, ['hf://datasets/origin-data-lab/stereo-imu-timestamp-integrity-camera-imu-alignment@2a705545cbff9ff556399047799ee9e64e95b387/a2_camimu_offset_curve.csv', 'hf://datasets/origin-data-lab/stereo-imu-timestamp-integrity-camera-imu-alignment@2a705545cbff9ff556399047799ee9e64e95b387/a2_frame_timestamps.csv.gz', 'hf://datasets/origin-data-lab/stereo-imu-timestamp-integrity-camera-imu-alignment@2a705545cbff9ff556399047799ee9e64e95b387/a2_timestamp_integrity.csv']
Please either edit the data files to have matching columns, or separate them into different configurations (see docs at https://hf.co/docs/hub/datasets-manual-configuration#multiple-configurations)Need help to make the dataset viewer work? Make sure to review how to configure the dataset viewer, and open a discussion for direct support.
offset_ms float64 | residual_median_deg float64 | pairs_used int64 | pairs_total int64 | angle_to_factory_deg float64 |
|---|---|---|---|---|
-40 | 1.7398 | 119 | 123 | 0.8903 |
-38 | 1.6659 | 118 | 122 | 0.8739 |
-36 | 1.5947 | 117 | 121 | 0.859 |
-34 | 1.5641 | 116 | 120 | 0.8443 |
-32 | 1.5214 | 117 | 120 | 0.8308 |
-30 | 1.4577 | 118 | 120 | 0.8172 |
-28 | 1.3954 | 118 | 120 | 0.8017 |
-26 | 1.3374 | 118 | 120 | 0.7863 |
-24 | 1.2997 | 118 | 120 | 0.7715 |
-22 | 1.195 | 117 | 120 | 0.7313 |
-20 | 1.1136 | 115 | 120 | 0.7254 |
-18 | 1.1641 | 119 | 120 | 0.6722 |
-16 | 1.0814 | 116 | 119 | 0.6699 |
-14 | 1.0329 | 116 | 119 | 0.6576 |
-12 | 1.0099 | 115 | 119 | 0.639 |
-10 | 0.9249 | 112 | 119 | 0.5858 |
-8 | 0.8995 | 112 | 119 | 0.5746 |
-6 | 0.8657 | 112 | 119 | 0.5624 |
-4 | 0.8579 | 112 | 119 | 0.5502 |
-2 | 0.8349 | 114 | 122 | 0.5597 |
0 | 0.8 | 111 | 123 | 0.6323 |
2 | 0.878 | 116 | 124 | 0.5172 |
4 | 0.8529 | 114 | 124 | 0.5472 |
6 | 0.9141 | 118 | 124 | 0.5081 |
8 | 0.9448 | 118 | 124 | 0.4982 |
10 | 0.9671 | 118 | 124 | 0.4879 |
12 | 1.0163 | 118 | 124 | 0.4788 |
14 | 1.0637 | 119 | 124 | 0.4992 |
16 | 1.0973 | 120 | 125 | 0.4907 |
18 | 1.1356 | 121 | 125 | 0.4788 |
20 | 1.1682 | 121 | 125 | 0.472 |
22 | 1.189 | 120 | 125 | 0.4596 |
24 | 1.2188 | 120 | 125 | 0.4544 |
26 | 1.2403 | 119 | 124 | 0.4469 |
28 | 1.246 | 119 | 124 | 0.4422 |
30 | 1.2468 | 119 | 125 | 0.4653 |
32 | 1.3152 | 119 | 125 | 0.517 |
34 | 1.3242 | 119 | 125 | 0.5154 |
36 | 1.3535 | 119 | 125 | 0.4627 |
38 | 1.3851 | 120 | 126 | 0.4629 |
40 | 1.4624 | 120 | 127 | 0.4567 |
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End of preview.
Origin Data Lab · Technical Field Note #10
ODL Stereo IMU Timestamp Integrity
English technical note | Korean technical note
ODL stereo+IMU timestamp integrity
Per-stereo-pair exposure timestamps (device clock) for 13 recordings of one R8 stereo+IMU unit, plus per-recording integrity summary and camera-IMU offset sweep.
Fields (a2_frame_timestamps.csv.gz)
recording, frame, left/right_exposure_start_us, left/right_exposure_us, start_delta_us, centre_delta_us, left_frame_interval_us
Collection / QC / limits
2026-10-26, indoor. Automated extraction, no external reference clock. Licence: Creative Commons Attribution 4.0 International (CC BY 4.0) for derived data and figures; MIT for code. No images or personal data.
Visual evidence
Figures are taken from the released technical-note package. Interpret with the original methods and limitations.
Figure 1
Median rotation residual between gyro-integrated and camera-measured rotations as a function of the tested time offset.
Figure 2
Right − left exposure-centre time for 67,746 stereo pairs (log scale; values above 80 µs pooled at the right edge).
About Origin Data Lab
Origin Data Lab (origindatalab.io, OriginDataLab Co., Ltd.) is a real-world data collection company based in Yangyang, Gangwon State, South Korea. We plan and run egocentric, stereo+IMU and field video capture for physical AI and robotics teams, with documented QA such as the measurements in this dataset. Not affiliated with "Origin Lab" (game data) or "OriginLab" (Origin/OriginPro software).
- Request sample data: stereo+IMU or phone+IMU egocentric capture
- Custom data collection: field capture in South Korea and Bangladesh
- All technical field notes
Explore Origin Data Lab
Official Website | Technical Field Notes | English Note | Korean Note
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