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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 2 new columns ({'duration', 'start'})

This happened while the json dataset builder was generating data using

hf://datasets/robotwang/MITFLD/transcripts/-Pg11JHzUTo.json (at revision f5a5047e040ecf0f80a3cb67d64e324407f323ec)

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 "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/builder.py", line 1831, in _prepare_split_single
                  writer.write_table(table)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/arrow_writer.py", line 644, in write_table
                  pa_table = table_cast(pa_table, self._schema)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/table.py", line 2272, in table_cast
                  return cast_table_to_schema(table, schema)
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/table.py", line 2218, in cast_table_to_schema
                  raise CastError(
              datasets.table.CastError: Couldn't cast
              text: string
              start: double
              duration: double
              -- schema metadata --
              pandas: '{"index_columns": [], "column_indexes": [], "columns": [{"name":' + 436
              to
              {'text': Value('int64')}
              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 1451, in compute_config_parquet_and_info_response
                  parquet_operations, partial, estimated_dataset_info = stream_convert_to_parquet(
                File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 994, in stream_convert_to_parquet
                  builder._prepare_split(
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/builder.py", line 1702, in _prepare_split
                  for job_id, done, content in self._prepare_split_single(
                File "/src/services/worker/.venv/lib/python3.9/site-packages/datasets/builder.py", line 1833, in _prepare_split_single
                  raise DatasetGenerationCastError.from_cast_error(
              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 2 new columns ({'duration', 'start'})
              
              This happened while the json dataset builder was generating data using
              
              hf://datasets/robotwang/MITFLD/transcripts/-Pg11JHzUTo.json (at revision f5a5047e040ecf0f80a3cb67d64e324407f323ec)
              
              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.

text
int64
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676
896
1,341
1,423
1,525
1,868
2,017
2,228
2,373
2,532
0
396
554
609
885
261
1,042
2,741
2,851
2,876
3,605
0
48
126
281
559
900
932
1,154
1,910
2,027
2,263
2,485
2,968
15
899
1,223
1,325
1,396
1,503
1,556
1,993
1,998
2,472
3,136
3,835
3,860
4,449
4,634
4,805
4,919
5,013
5,075
5,193
43
60
124
140
276
1,118
1,579
1,608
2,049
2,190
2,464
2,745
3,143
3,289
3,391
3,572
3,787
4,337
230
475
1,089
3,081
105
612
1,323
1,720
1,986
2,104
0
137
321
428
562
700
871
1,075
15
2,073
2,429
2,481
2,779
2,894
3,052
3,092
End of preview.

YAML Metadata Warning:empty or missing yaml metadata in repo card

Check out the documentation for more information.

MITFLD: MIT Lecture Fragmentation Dataset

MITFLD is a lecture video fragmentation dataset introduced in Towards Key Point Identification (KPI) for Lecture Videos: Approaches and Performance Evaluation, serving as a benchmark for lecture video fragmentation methods without using synthetic videos.

It enables research in:

  • Key Point Identification (KPI) in lecture videos
  • Lecture fragment recommendation
  • Non-linear and bite-sized learning
  • Content-based indexing and search for lecture videos

Data Source Attribution

The MITFLD dataset is sourced from MIT OpenCourseWare, a free and open publication of material from thousands of MIT courses, enabling global access to high-quality educational resources.

Folder Structure

β”œβ”€β”€ frags
β”‚   └── <video_id>.json         # Ground truth fragment annotations
β”œβ”€β”€ README.md
β”œβ”€β”€ transcripts
β”‚   └── <video_id>.json         # Transcript of the lecture
β”œβ”€β”€ video_id_list.txt           # List of video_ids included
└── videos
    └── <video_id>.mp4          # Lecture video files

KPI Framework

To facilitate experiments, the dataset is designed to work seamlessly with the kpi unified Python framework for lecture video fragmentation, providing:

  • Dataset abstractions
  • Multiple baseline and advanced methods (e.g., BiLSTM, TW-FINCH, PSD)
  • Evaluation metrics (F-score, mMoF, mIoU)
  • Extensibility for your own methods

Citation

If you use this dataset or the kpi framework in your research, please cite:

@article{wang2025towards,
  title={Towards Key Point Identification (KPI) for Lecture Videos: Approaches and Performance Evaluation},
  author={Wang, Jiaqi and Kwok, Ricky Y-K and Ngai, Edith CH},
  journal={ACM Transactions on Multimedia Computing, Communications and Applications},
  year={2025},
  publisher={ACM New York, NY}
}
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