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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 |
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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