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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 ({'concurrent_attendees', 'minute_offset'}) and 3 missing columns ({'join_offset_s', 'participant_id', 'leave_offset_s'}).

This happened while the csv dataset builder was generating data using

hf://datasets/vicharanashala-org/Online_Live_Polling_Dataset/attendance_timeline.csv (at revision fe7e2ce075ceeb2256da951e11f26355df06eb59), ['hf://datasets/vicharanashala-org/Online_Live_Polling_Dataset@fe7e2ce075ceeb2256da951e11f26355df06eb59/attendance_intervals.csv', 'hf://datasets/vicharanashala-org/Online_Live_Polling_Dataset@fe7e2ce075ceeb2256da951e11f26355df06eb59/attendance_timeline.csv', 'hf://datasets/vicharanashala-org/Online_Live_Polling_Dataset@fe7e2ce075ceeb2256da951e11f26355df06eb59/participant_sessions.csv', 'hf://datasets/vicharanashala-org/Online_Live_Polling_Dataset@fe7e2ce075ceeb2256da951e11f26355df06eb59/poll_responses.csv', 'hf://datasets/vicharanashala-org/Online_Live_Polling_Dataset@fe7e2ce075ceeb2256da951e11f26355df06eb59/polls.csv', 'hf://datasets/vicharanashala-org/Online_Live_Polling_Dataset@fe7e2ce075ceeb2256da951e11f26355df06eb59/sessions.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 1848, in _prepare_split_single
                  writer.write_table(table)
                  ~~~~~~~~~~~~~~~~~~^^^^^^^
                File "/usr/local/lib/python3.14/site-packages/datasets/arrow_writer.py", line 784, 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 795, in _write_table
                  pa_table = table_cast(pa_table, self._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
              session_id: string
              minute_offset: int64
              concurrent_attendees: int64
              -- schema metadata --
              pandas: '{"index_columns": [{"kind": "range", "name": null, "start": 0, "' + 660
              to
              {'participant_id': Value('string'), 'session_id': Value('string'), 'join_offset_s': Value('int64'), 'leave_offset_s': 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 1369, 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 948, 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 1694, 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 1850, 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 2 new columns ({'concurrent_attendees', 'minute_offset'}) and 3 missing columns ({'join_offset_s', 'participant_id', 'leave_offset_s'}).
              
              This happened while the csv dataset builder was generating data using
              
              hf://datasets/vicharanashala-org/Online_Live_Polling_Dataset/attendance_timeline.csv (at revision fe7e2ce075ceeb2256da951e11f26355df06eb59), ['hf://datasets/vicharanashala-org/Online_Live_Polling_Dataset@fe7e2ce075ceeb2256da951e11f26355df06eb59/attendance_intervals.csv', 'hf://datasets/vicharanashala-org/Online_Live_Polling_Dataset@fe7e2ce075ceeb2256da951e11f26355df06eb59/attendance_timeline.csv', 'hf://datasets/vicharanashala-org/Online_Live_Polling_Dataset@fe7e2ce075ceeb2256da951e11f26355df06eb59/participant_sessions.csv', 'hf://datasets/vicharanashala-org/Online_Live_Polling_Dataset@fe7e2ce075ceeb2256da951e11f26355df06eb59/poll_responses.csv', 'hf://datasets/vicharanashala-org/Online_Live_Polling_Dataset@fe7e2ce075ceeb2256da951e11f26355df06eb59/polls.csv', 'hf://datasets/vicharanashala-org/Online_Live_Polling_Dataset@fe7e2ce075ceeb2256da951e11f26355df06eb59/sessions.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.

participant_id
string
session_id
string
join_offset_s
int64
leave_offset_s
int64
P0003
S01
2,025
2,046
P0003
S01
2,047
2,077
P0003
S01
2,173
2,184
P0003
S01
2,184
2,756
P0003
S01
2,757
10,031
P0006
S01
7,610
12,364
P0006
S01
12,365
14,577
P0008
S01
2,132
2,143
P0008
S01
2,143
14,679
P0014
S01
5,856
11,395
P0014
S01
11,396
14,750
P0025
S01
1,247
1,760
P0025
S01
1,760
1,969
P0025
S01
1,939
1,959
P0025
S01
1,959
2,169
P0025
S01
2,207
2,216
P0025
S01
2,217
3,447
P0025
S01
3,524
3,533
P0025
S01
3,533
4,120
P0025
S01
5,436
5,445
P0025
S01
5,446
5,465
P0025
S01
5,781
6,866
P0025
S01
6,927
7,205
P0025
S01
7,178
9,865
P0025
S01
10,349
12,122
P0025
S01
12,213
14,600
P0026
S01
356
365
P0026
S01
1,619
1,948
P0026
S01
1,637
1,950
P0026
S01
1,948
4,470
P0026
S01
1,951
5,523
P0026
S01
6,770
7,678
P0026
S01
7,678
14,570
P0028
S01
1,862
1,961
P0028
S01
1,961
10,789
P0028
S01
10,782
14,591
P0038
S01
2,031
2,048
P0038
S01
2,048
5,698
P0047
S01
1,861
1,951
P0047
S01
1,952
14,255
P0048
S01
2,966
2,975
P0048
S01
2,975
14,619
P0052
S01
1,930
1,953
P0052
S01
1,953
2,261
P0052
S01
2,706
2,707
P0052
S01
2,708
14,358
P0052
S01
14,358
14,573
P0054
S01
2,042
2,053
P0054
S01
2,054
9,687
P0071
S01
1,939
1,961
P0071
S01
1,962
14,999
P0072
S01
2,151
2,162
P0072
S01
2,163
5,260
P0072
S01
5,282
14,611
P0073
S01
13,089
13,145
P0084
S01
3,337
3,339
P0084
S01
3,339
4,650
P0084
S01
4,650
10,479
P0088
S01
2,218
2,233
P0088
S01
2,234
2,271
P0088
S01
2,290
2,296
P0088
S01
2,296
9,090
P0090
S01
2,059
2,070
P0090
S01
2,071
2,087
P0090
S01
2,087
2,143
P0090
S01
2,219
2,240
P0090
S01
2,240
3,079
P0090
S01
3,136
3,609
P0090
S01
4,355
4,358
P0090
S01
4,359
7,589
P0090
S01
7,479
14,912
P0091
S01
1,741
1,952
P0091
S01
1,953
9,296
P0091
S01
11,467
12,211
P0092
S01
2,282
2,297
P0092
S01
2,298
5,125
P0094
S01
1,946
1,970
P0094
S01
1,971
4,438
P0094
S01
4,350
4,353
P0094
S01
4,354
6,698
P0094
S01
6,698
7,020
P0094
S01
7,021
14,999
P0099
S01
1,509
1,810
P0099
S01
1,839
1,954
P0099
S01
1,955
5,942
P0099
S01
5,942
14,704
P0108
S01
1,853
1,950
P0108
S01
1,951
3,056
P0108
S01
3,056
3,761
P0108
S01
3,762
13,605
P0108
S01
13,769
14,574
P0114
S01
2,554
2,556
P0114
S01
2,556
5,738
P0114
S01
5,789
6,048
P0118
S01
1,313
1,949
P0118
S01
1,950
15,000
P0121
S01
2,073
2,080
P0121
S01
2,081
9,903
P0121
S01
10,318
14,593
P0136
S01
379
442
End of preview.

Online Live-Polling Dataset

Live poll records and attendance from 47 online sessions. The data was collected in an internship programme between May 2026 and July 2026. Sessions were held over Zoom, and the polls were run with Zoom's built-in polling feature, so all tables derive from Zoom's poll and attendance exports.

Six tables. sessions.csv and polls.csv describe sessions and polls; the other four record attendance and poll answers at the level of individual participants, who appear only as anonymous ids. Tables join on session_id, poll_order and participant_id.

Files

File Rows Contents
data/sessions.csv 47 one row per session
data/polls.csv 604 one row per poll
data/attendance_timeline.csv 8,368 one row per session-minute: how many attendees were present
data/attendance_intervals.csv 133,559 one row per stay in a session, from joining to leaving
data/poll_responses.csv 340,668 one row per submitted poll answer
data/participant_sessions.csv 34,446 one row per participant per session

sessions.csv

8 columns, one row per session.

Column Meaning
session_id S01…S47, numbered chronologically by session start
day_index programme day, 1–39; empty for the single session held outside the scheduled series
session_in_day position within that day (1, 2 or 3); empty for that same session
attendance_span_min last minute at which any attendee was still present
peak_concurrent highest number of simultaneous attendees
unique_attendees distinct attendees over the whole session
n_polls polls launched
n_responses responses submitted across those polls

polls.csv

10 columns, one row per poll.

Column Meaning
session_id, day_index as above, repeated for convenience
poll_order position of the poll within its session, from 1
offset_min_from_start minutes from session start to the poll's first response
response_window_s seconds from the first response to the last
poll_type see Poll types
n_distinct_answers how many distinct answer strings the poll drew
n_responses responses submitted
present_at_launch attendees in the room when the poll opened
unique_attendees distinct attendees over the whole session

attendance_timeline.csv

3 columns, one row per minute of each session.

Column Meaning
session_id as above
minute_offset minutes from session start, from 0 to the session's attendance_span_min
concurrent_attendees distinct attendees present at that minute

attendance_intervals.csv

4 columns, one row per stay. A participant who leaves and rejoins has one row per stay.

Column Meaning
participant_id anonymous participant id, see Participant ids
session_id as above
join_offset_s seconds from session start to joining; 0 for anyone already present at the start
leave_offset_s seconds from session start to leaving

poll_responses.csv

4 columns, one row per answer submitted. Which answer was chosen is not included.

Column Meaning
participant_id anonymous participant id
session_id, poll_order the poll answered, as in polls.csv
response_offset_s seconds after that poll's first response; 0 for the first respondent

participant_sessions.csv

4 columns, one row for every participant who attended a session or answered one of its polls. It is a convenience summary of the two tables above.

Column Meaning
participant_id anonymous participant id
session_id as above
minutes_present total time present, with overlapping stays counted once
polls_answered polls in that session this participant answered

Participant ids

Each person is a random id, P0001…P2821, the same in every table and every session. Every account in the Zoom reports is a participant, including the organisers' and speakers' accounts. Ids were assigned in random order and the link between an id and a person was not kept, so an id cannot be traced back to anyone. Names, email addresses, the content of answers, and all dates and clock times are removed; times appear only as offsets within a session.

Reading the columns

Participation is not a column. Divide n_responses by present_at_launch. That works for 603 of the 604 polls; the exception is the one poll nobody answered.

offset_min_from_start is measured to the first response, not to the launch. The Zoom export records when each response arrived but never records when a poll was opened, so no launch time exists in the source. The offset overstates when the poll appeared, by however long the fastest respondent took. For the same reason response_offset_s counts from the first response, not from the launch.

n_distinct_answers counts distinct answer strings received, not options offered. For a True/False item where both answers were chosen it is 2; where a poll accepted typed answers it can be large, the maximum here being 423. It is 0 for the one poll nobody answered, and 1 where every respondent gave the same answer. The distribution is 534 polls at exactly 2, 45 between 3 and 8, 22 above 8, and 3 below 2. The Zoom export does not record option lists, so the number of options a poll offered is not recoverable.

attendance_span_min is not the scheduled length. An attendee who never clicks leave keeps the meeting open, so the span overruns the real session on some days (median 157 minutes, maximum 876). peak_concurrent is the reliable measure of how full a session was.

Participation can exceed 1. present_at_launch is the room size at the poll's first response; attendees who joined during the response window and answered are counted in n_responses but not in the denominator. This happens on one poll (S03 q1: 280 responses against 263 present).

Session S34 is very small (21 unique attendees, single-digit presence at each of its four polls) and behaves unlike the rest of the corpus.

Every poll has a row, including the one nobody answered, so these are full counts rather than a filtered subset.

The tables are consistent with one another. Counting distinct participants present at each minute in attendance_intervals.csv reproduces attendance_timeline.csv exactly, and from it peak_concurrent and attendance_span_min. Counting rows of poll_responses.csv reproduces n_responses in polls.csv and sessions.csv, and the largest response_offset_s of each poll equals its response_window_s.

unique_attendees comes from Zoom's attendee summary report, while attendance_intervals.csv comes from its join-and-leave report. The two reports count slightly differently, so the number of distinct participants in a session's intervals can exceed unique_attendees (by at most 60, and equal in 7 sessions).

Stays. Most participants have several stays in a session (up to 131), since every reconnection starts a new one. 126 stays have zero length.

Participants who never answered. 3,653 rows of participant_sessions.csv have polls_answered 0. Two rows have an empty minutes_present: these participants answered a poll but do not appear in the attendance report. Of the 2,821 participants, 2,419 answered at least one poll.

Poll types

poll_type is assigned by a keyword match on the question text:

Value Count Matched on
assessment_tf 424 contains "true or false", "true/false", "t/f", or the word "true"
assessment_other 143 anything not matched above
affective 32 mood, feeling, energy, vibe
icebreaker 3 hobby, favourite, movie, series, breakfast
demographic 2 state, city, where are you from, gender

Rules are applied in that order, so affective, demographic and icebreaker are checked first. It is a coarse convenience label, and assessment_other is a residual rather than a category.

License

MIT License, see LICENSE.

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