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Fixes #8996
`Dataset.class_encode_column` and `Dataset.align_labels_with_mapping` now work on formatted datasets. Before, with a `torch` format, `class_encode_column` on an integer column produced the class names `['tensor(1)', 'tensor(3)']` instead of `['1', '3']`, and with the `numpy`, `arrow` or `... | value:https://api.github.com/repos/huggingface/datasets/issues/8997/comments | value:PR_kwDODunzps8AAAABOLXYmA | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8997", "html_url": "https://github.com/huggingface/datasets/pull/8997", "diff_url": "https://github.com/huggingface/datasets/pull/8997.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8997.patch", "merged_at": null} | value:2026-11-10T18:09:31Z | value:https://api.github.com/repos/huggingface/datasets/issues/8997/labels{/name} | value:8997 | json:{"login": "Shizoqua", "id": 136805224, "node_id": "U_kgDOCCd7aA", "avatar_url": "https://avatars.githubusercontent.com/u/136805224?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Shizoqua", "html_url": "https://github.com/Shizoqua", "followers_url": "https://api.github.com/users/Shizoqua/followers", ... | value:False | true | |||||||||||
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`Dataset.class_encode_column` and `Dataset.align_labels_with_mapping` run their internal `map` with the dataset's format, but the functions they map expect batches of python lists. On a dataset formatted with `torch`, `class_encode_column` on an integer column silently produces class names l... | value:https://api.github.com/repos/huggingface/datasets/issues/8996/comments | value:I_kwDODunzps8AAAABeEbBOQ | value:open | value:1 | value:2026-11-10T18:08:38Z | value:https://api.github.com/repos/huggingface/datasets/issues/8996/labels{/name} | value:8996 | json:{"login": "Shizoqua", "id": 136805224, "node_id": "U_kgDOCCd7aA", "avatar_url": "https://avatars.githubusercontent.com/u/136805224?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Shizoqua", "html_url": "https://github.com/Shizoqua", "followers_url": "https://api.github.com/users/Shizoqua/followers", ... | true | ||||||||||
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With `num_proc > 1`, `Dataset.to_sql`, `to_csv` and `to_json` and the download/extract step of `load_dataset(..., num_proc=N)` never return if a pool worker dies abruptly, for example after an OOM kill, a `kill -9`, or a task that fails to unpickle in the worker. `Dataset.map` already raises in this... | value:https://api.github.com/repos/huggingface/datasets/issues/8995/comments | value:PR_kwDODunzps8AAAABOHwHrg | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8995", "html_url": "https://github.com/huggingface/datasets/pull/8995", "diff_url": "https://github.com/huggingface/datasets/pull/8995.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8995.patch", "merged_at": null} | value:2026-11-10T14:03:40Z | value:https://api.github.com/repos/huggingface/datasets/issues/8995/labels{/name} | value:8995 | json:{"login": "AdrianPerez3", "id": 70107702, "node_id": "MDQ6VXNlcjcwMTA3NzAy", "avatar_url": "https://avatars.githubusercontent.com/u/70107702?v=4", "gravatar_id": "", "url": "https://api.github.com/users/AdrianPerez3", "html_url": "https://github.com/AdrianPerez3", "followers_url": "https://api.github.com/users/Adr... | value:False | true | |||||||||||
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With `num_proc > 1`, two code paths send their tasks to a stdlib `multiprocessing.Pool` and wait on it without the dead-worker check that #5976 added to `iflatmap_unordered`:
- the writers behind `Dataset.to_sql`, `to_csv` and `to_json`, which iterate over `pool.imap(...)` (`io/sql.py`, `io... | value:https://api.github.com/repos/huggingface/datasets/issues/8993/comments | value:I_kwDODunzps8AAAABd71IuQ | value:open | value:2 | value:2026-11-10T10:13:42Z | value:https://api.github.com/repos/huggingface/datasets/issues/8993/labels{/name} | value:8993 | json:{"login": "AdrianPerez3", "id": 70107702, "node_id": "MDQ6VXNlcjcwMTA3NzAy", "avatar_url": "https://avatars.githubusercontent.com/u/70107702?v=4", "gravatar_id": "", "url": "https://api.github.com/users/AdrianPerez3", "html_url": "https://github.com/AdrianPerez3", "followers_url": "https://api.github.com/users/Adr... | true | |||||||||||
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Datasets derived from the same dataset (e.g. `ds.skip(n)` and `ds.take(n)`) share its ex_iterables. Creating or iterating one of them runs `_prepare_ex_iterable_for_iteration()`, which calls `_init_state_dict()` on the shared nodes and replaces their state dicts. The other dataset's running iterator ... | value:https://api.github.com/repos/huggingface/datasets/issues/8992/comments | value:PR_kwDODunzps8AAAABOC8P9w | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8992", "html_url": "https://github.com/huggingface/datasets/pull/8992", "diff_url": "https://github.com/huggingface/datasets/pull/8992.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8992.patch", "merged_at": "2026-11-10T17:23:43Z"} | value:2026-11-10T17:23:43Z | value:https://api.github.com/repos/huggingface/datasets/issues/8992/labels{/name} | value:8992 | json:{"login": "Dhruv-Sharma29", "id": 237243628, "node_id": "U_kgDODiQM7A", "avatar_url": "https://avatars.githubusercontent.com/u/237243628?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Dhruv-Sharma29", "html_url": "https://github.com/Dhruv-Sharma29", "followers_url": "https://api.github.com/users/Dhr... | value:False | true | |||||||||
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If two datasets are derived from the same `IterableDataset` (for example `train_ds = ds.skip(n)` and `eval_ds = ds.take(n)`), creating or iterating one of them freezes the `state_dict()` of the other while it is being iterated. The examples it yields are still correct, but its checkpoint sto... | value:https://api.github.com/repos/huggingface/datasets/issues/8991/comments | value:I_kwDODunzps8AAAABd6cprg | value:closed | value:0 | value:2026-11-10T17:23:45Z | value:https://api.github.com/repos/huggingface/datasets/issues/8991/labels{/name} | value:8991 | json:{"login": "Dhruv-Sharma29", "id": 237243628, "node_id": "U_kgDODiQM7A", "avatar_url": "https://avatars.githubusercontent.com/u/237243628?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Dhruv-Sharma29", "html_url": "https://github.com/Dhruv-Sharma29", "followers_url": "https://api.github.com/users/Dhr... | true | ||||||||
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### Description
Align `FilteredExamplesIterable.shuffle_data_sources` signature with `_BaseExamplesIterable` and sibling iterable classes (`MappedExamplesIterable`, `ExamplesIterable`, etc.).
Currently, `FilteredExamplesIterable.shuffle_data_sources` accepts `seed: Optional[int]` and passes it dire... | value:https://api.github.com/repos/huggingface/datasets/issues/8989/comments | value:PR_kwDODunzps8AAAABOBqrqw | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8989", "html_url": "https://github.com/huggingface/datasets/pull/8989", "diff_url": "https://github.com/huggingface/datasets/pull/8989.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8989.patch", "merged_at": null} | value:2026-11-10T05:16:12Z | value:https://api.github.com/repos/huggingface/datasets/issues/8989/labels{/name} | value:8989 | json:{"login": "davrens101", "id": 166565828, "node_id": "U_kgDOCe2XxA", "avatar_url": "https://avatars.githubusercontent.com/u/166565828?v=4", "gravatar_id": "", "url": "https://api.github.com/users/davrens101", "html_url": "https://github.com/davrens101", "followers_url": "https://api.github.com/users/davrens101/foll... | value:False | true | |||||||||
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In `datasets.iterable_dataset.FilteredExamplesIterable`, the `shuffle_data_sources` method has a signature mismatch compared to `_BaseExamplesIterable` and all other sibling iterable classes:
```python
class FilteredExamplesIterable(MappedExamplesIterable):
...
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Reject negative weights and weight lists without a positive value in `Split.subsplit(weighted=...)`. This replaces division by zero or invalid percent slices with a clear `ValueError`, while retaining support for a zero weight paired with a positive weight.
Added regression cases for invalid weights... | value:https://api.github.com/repos/huggingface/datasets/issues/8987/comments | value:PR_kwDODunzps8AAAABOAqqOw | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8987", "html_url": "https://github.com/huggingface/datasets/pull/8987", "diff_url": "https://github.com/huggingface/datasets/pull/8987.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8987.patch", "merged_at": null} | value:2026-11-10T12:20:10Z | value:https://api.github.com/repos/huggingface/datasets/issues/8987/labels{/name} | value:8987 | json:{"login": "Gninjaa", "id": 149934057, "node_id": "U_kgDOCO_P6Q", "avatar_url": "https://avatars.githubusercontent.com/u/149934057?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Gninjaa", "html_url": "https://github.com/Gninjaa", "followers_url": "https://api.github.com/users/Gninjaa/followers", "fol... | value:False | true | |||||||||||
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`Split.subsplit(weighted=...)` accepts negative weights and can produce invalid percent slices. When all weights are zero, it raises `ZeroDivisionError` while normalizing the weights.
### Steps to reproduce the bug
```python
from datasets import Split
Split.TRAIN.subsplit(weighted=[0, 0])... | value:https://api.github.com/repos/huggingface/datasets/issues/8986/comments | value:I_kwDODunzps8AAAABd3sHwQ | value:open | value:1 | value:2026-11-10T03:18:52Z | value:https://api.github.com/repos/huggingface/datasets/issues/8986/labels{/name} | value:8986 | json:{"login": "Gninjaa", "id": 149934057, "node_id": "U_kgDOCO_P6Q", "avatar_url": "https://avatars.githubusercontent.com/u/149934057?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Gninjaa", "html_url": "https://github.com/Gninjaa", "followers_url": "https://api.github.com/users/Gninjaa/followers", "fol... | true | ||||||||||
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A local file with the same name as a WebDataset member can replace the embedded image. When an `Image` dictionary supplies both a relative archive label and bytes, the encoder can discard the bytes if the label happens to resolve to a file in the working directory.
Keep the relative label and the sup... | value:https://api.github.com/repos/huggingface/datasets/issues/8982/comments | value:PR_kwDODunzps8AAAABN5v5xw | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8982", "html_url": "https://github.com/huggingface/datasets/pull/8982", "diff_url": "https://github.com/huggingface/datasets/pull/8982.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8982.patch", "merged_at": null} | value:2026-11-09T17:11:01Z | value:https://api.github.com/repos/huggingface/datasets/issues/8982/labels{/name} | value:8982 | json:{"login": "GoldArowana", "id": 27399349, "node_id": "MDQ6VXNlcjI3Mzk5MzQ5", "avatar_url": "https://avatars.githubusercontent.com/u/27399349?v=4", "gravatar_id": "", "url": "https://api.github.com/users/GoldArowana", "html_url": "https://github.com/GoldArowana", "followers_url": "https://api.github.com/users/GoldAr... | value:False | true | |||||||||||
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Adding a column to an Arrow-, pandas-, or Polars-formatted `IterableDataset` currently raises `TypeError` during iteration because the internal callback returns a dictionary. Perform this operation in batched Arrow format, append the new column without discarding the original columns, and restore th... | value:https://api.github.com/repos/huggingface/datasets/issues/8981/comments | value:PR_kwDODunzps8AAAABNsYR6g | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8981", "html_url": "https://github.com/huggingface/datasets/pull/8981", "diff_url": "https://github.com/huggingface/datasets/pull/8981.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8981.patch", "merged_at": null} | value:2026-11-08T18:26:32Z | value:https://api.github.com/repos/huggingface/datasets/issues/8981/labels{/name} | value:8981 | json:{"login": "FOWEPJF255", "id": 270070255, "node_id": "U_kgDOEBjx7w", "avatar_url": "https://avatars.githubusercontent.com/u/270070255?v=4", "gravatar_id": "", "url": "https://api.github.com/users/FOWEPJF255", "html_url": "https://github.com/FOWEPJF255", "followers_url": "https://api.github.com/users/FOWEPJF255/foll... | value:False | true | |||||||||||
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`IterableDataset.add_column()` fails during iteration after `with_format("arrow")`, `with_format("pandas")`, or `with_format("polars")`. Adding the column before selecting the format works. This prevents a streaming data preparation pipeline from adding metadata columns after it has selected... | value:https://api.github.com/repos/huggingface/datasets/issues/8980/comments | value:I_kwDODunzps8AAAABdfdI_w | value:open | value:1 | value:2026-11-08T18:22:19Z | value:https://api.github.com/repos/huggingface/datasets/issues/8980/labels{/name} | value:8980 | json:{"login": "FOWEPJF255", "id": 270070255, "node_id": "U_kgDOEBjx7w", "avatar_url": "https://avatars.githubusercontent.com/u/270070255?v=4", "gravatar_id": "", "url": "https://api.github.com/users/FOWEPJF255", "html_url": "https://github.com/FOWEPJF255", "followers_url": "https://api.github.com/users/FOWEPJF255/foll... | true | ||||||||||
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```python
from datasets import IterableDataset
ds = IterableDataset.from_dict({"a": [1, 2, 3], "b": ["x", "y", "z"]})
list(ds.with_format("arrow").rename_column("a",... | value:https://api.github.com/repos/huggingface/datasets/issues/8977/comments | value:PR_kwDODunzps8AAAABNmnIdQ | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8977", "html_url": "https://github.com/huggingface/datasets/pull/8977", "diff_url": "https://github.com/huggingface/datasets/pull/8977.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8977.patch", "merged_at": "2026-11-10T17:24:13Z"} | value:2026-11-10T17:24:13Z | value:https://api.github.com/repos/huggingface/datasets/issues/8977/labels{/name} | value:8977 | json:{"login": "assass1nlike", "id": 326038984, "node_id": "U_kgDOE271yA", "avatar_url": "https://avatars.githubusercontent.com/u/326038984?v=4", "gravatar_id": "", "url": "https://api.github.com/users/assass1nlike", "html_url": "https://github.com/assass1nlike", "followers_url": "https://api.github.com/users/assass1nl... | value:False | true | |||||||||
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cc @lhoestq | value:https://api.github.com/repos/huggingface/datasets/issues/8976/comments | value:PR_kwDODunzps8AAAABNmcdng | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8976", "html_url": "https://github.com/huggingface/datasets/pull/8976", "diff_url": "https://github.com/huggingface/datasets/pull/8976.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8976.patch", "merged_at": "2026-11-09T17:28:50Z"} | value:2026-11-09T17:28:50Z | value:https://api.github.com/repos/huggingface/datasets/issues/8976/labels{/name} | value:8976 | json:{"login": "its-amann", "id": 163747435, "node_id": "U_kgDOCcKWaw", "avatar_url": "https://avatars.githubusercontent.com/u/163747435?v=4", "gravatar_id": "", "url": "https://api.github.com/users/its-amann", "html_url": "https://github.com/its-amann", "followers_url": "https://api.github.com/users/its-amann/follower... | value:False | true | |||||||||
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\get_parquet_column_options\ applied a single top-level \
equire_storage_embed\
result to every leaf under a struct field, disabling compression and dictionary
encoding for non-media columns whenever a media feature was present. Compute the
embed flag per leaf based on its own feature.
This pull req... | value:https://api.github.com/repos/huggingface/datasets/issues/8975/comments | value:PR_kwDODunzps8AAAABNmTHlw | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8975", "html_url": "https://github.com/huggingface/datasets/pull/8975", "diff_url": "https://github.com/huggingface/datasets/pull/8975.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8975.patch", "merged_at": null} | value:2026-11-08T01:21:44Z | value:https://api.github.com/repos/huggingface/datasets/issues/8975/labels{/name} | value:8975 | json:{"login": "davrens101", "id": 166565828, "node_id": "U_kgDOCe2XxA", "avatar_url": "https://avatars.githubusercontent.com/u/166565828?v=4", "gravatar_id": "", "url": "https://api.github.com/users/davrens101", "html_url": "https://github.com/davrens101", "followers_url": "https://api.github.com/users/davrens101/foll... | value:False | true | |||||||||||
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### Context & Problem
In #8674, Parquet writer options (`compression`, `use_dictionary`, `column_encoding`) were keyed by leaf path rather than top-level column names so nested struct/list fields would be compressed.
However, `get_parquet_column_options` still checked `require_storage_embed` only a... | value:https://api.github.com/repos/huggingface/datasets/issues/8974/comments | value:PR_kwDODunzps8AAAABNmHV5w | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8974", "html_url": "https://github.com/huggingface/datasets/pull/8974", "diff_url": "https://github.com/huggingface/datasets/pull/8974.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8974.patch", "merged_at": null} | value:2026-11-08T00:50:48Z | value:https://api.github.com/repos/huggingface/datasets/issues/8974/labels{/name} | value:8974 | json:{"login": "davrens101", "id": 166565828, "node_id": "U_kgDOCe2XxA", "avatar_url": "https://avatars.githubusercontent.com/u/166565828?v=4", "gravatar_id": "", "url": "https://api.github.com/users/davrens101", "html_url": "https://github.com/davrens101", "followers_url": "https://api.github.com/users/davrens101/foll... | value:False | true | |||||||||||
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When a dataset contains a struct or dictionary column that includes an embedded storage feature (such as `Image`, `Audio`, `Video`, etc.) alongside non-media columns (such as text strings, integers, floats, or vectors), saving the dataset to Parquet via `to_parquet()` or `push_to_hub()` disa... | value:https://api.github.com/repos/huggingface/datasets/issues/8973/comments | value:I_kwDODunzps8AAAABdXu1Fg | value:open | value:1 | value:2026-11-08T00:49:45Z | value:https://api.github.com/repos/huggingface/datasets/issues/8973/labels{/name} | value:8973 | json:{"login": "davrens101", "id": 166565828, "node_id": "U_kgDOCe2XxA", "avatar_url": "https://avatars.githubusercontent.com/u/166565828?v=4", "gravatar_id": "", "url": "https://api.github.com/users/davrens101", "html_url": "https://github.com/davrens101", "followers_url": "https://api.github.com/users/davrens101/foll... | true | ||||||||||
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```python
from datasets import load_dataset
load_dataset("eval", data_files="swe_benc... | value:https://api.github.com/repos/huggingface/datasets/issues/8972/comments | value:PR_kwDODunzps8AAAABNmA7Ag | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8972", "html_url": "https://github.com/huggingface/datasets/pull/8972", "diff_url": "https://github.com/huggingface/datasets/pull/8972.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8972.patch", "merged_at": null} | value:2026-11-08T11:13:13Z | value:https://api.github.com/repos/huggingface/datasets/issues/8972/labels{/name} | value:8972 | json:{"login": "aidxhxr", "id": 93529551, "node_id": "U_kgDOBZMlzw", "avatar_url": "https://avatars.githubusercontent.com/u/93529551?v=4", "gravatar_id": "", "url": "https://api.github.com/users/aidxhxr", "html_url": "https://github.com/aidxhxr", "followers_url": "https://api.github.com/users/aidxhxr/followers", "follo... | value:False | true | |||||||||||
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The Hub loading guide now shows where to find the Dataset Viewer’s **Auto-converted to Parquet** link and how to load one split from the conversion branch. The example uses the same CSV dataset already introduced in the guide and links to the Hub documentation for partial conversions and API access... | value:https://api.github.com/repos/huggingface/datasets/issues/8970/comments | value:PR_kwDODunzps8AAAABNiOk8g | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8970", "html_url": "https://github.com/huggingface/datasets/pull/8970", "diff_url": "https://github.com/huggingface/datasets/pull/8970.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8970.patch", "merged_at": null} | value:2026-11-07T15:48:21Z | value:https://api.github.com/repos/huggingface/datasets/issues/8970/labels{/name} | value:8970 | json:{"login": "Lizidong01", "id": 61378198, "node_id": "MDQ6VXNlcjYxMzc4MTk4", "avatar_url": "https://avatars.githubusercontent.com/u/61378198?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Lizidong01", "html_url": "https://github.com/Lizidong01", "followers_url": "https://api.github.com/users/Lizidong0... | value:False | true | |||||||||||
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Fixes #8967
`Dataset.map(num_proc=...)` with a `suffix_template` whose rank field is not exactly `{rank:05d}` (for example `_{rank:03d}_of_{num_proc:03d}`) worked on the first run, then raised `ValueError: Unknown format code 'd' for object of type 'str'` on every rerun that loaded all shards from th... | value:https://api.github.com/repos/huggingface/datasets/issues/8968/comments | value:PR_kwDODunzps8AAAABNgU1jw | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8968", "html_url": "https://github.com/huggingface/datasets/pull/8968", "diff_url": "https://github.com/huggingface/datasets/pull/8968.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8968.patch", "merged_at": null} | value:2026-11-07T11:44:12Z | value:https://api.github.com/repos/huggingface/datasets/issues/8968/labels{/name} | value:8968 | json:{"login": "Shizoqua", "id": 136805224, "node_id": "U_kgDOCCd7aA", "avatar_url": "https://avatars.githubusercontent.com/u/136805224?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Shizoqua", "html_url": "https://github.com/Shizoqua", "followers_url": "https://api.github.com/users/Shizoqua/followers", ... | value:False | true | |||||||||||
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`Dataset.map` with `num_proc` and a custom `suffix_template` works the first time, but every rerun that loads all shards from the cache raises `ValueError: Unknown format code 'd' for object of type 'str'`. Only the default `{rank:05d}` works. `Dataset.filter` has the same `suffix_template` ... | value:https://api.github.com/repos/huggingface/datasets/issues/8967/comments | value:I_kwDODunzps8AAAABdQscqg | value:open | value:1 | value:2026-11-07T11:42:56Z | value:https://api.github.com/repos/huggingface/datasets/issues/8967/labels{/name} | value:8967 | json:{"login": "Shizoqua", "id": 136805224, "node_id": "U_kgDOCCd7aA", "avatar_url": "https://avatars.githubusercontent.com/u/136805224?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Shizoqua", "html_url": "https://github.com/Shizoqua", "followers_url": "https://api.github.com/users/Shizoqua/followers", ... | true | ||||||||||
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Fixes #8965
`Dataset.batch(by_column=...)` and `IterableDataset.batch(by_column=...)` treated a null key as equal to its neighbours, so different groups were merged into one batch. Keys `[1, None, 2]` gave a single batch. A key column with only nulls raised `ArrowNotImplementedError`. Now a null is i... | value:https://api.github.com/repos/huggingface/datasets/issues/8966/comments | value:PR_kwDODunzps8AAAABNbzIaw | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8966", "html_url": "https://github.com/huggingface/datasets/pull/8966", "diff_url": "https://github.com/huggingface/datasets/pull/8966.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8966.patch", "merged_at": "2026-11-10T17:24:28Z"} | value:2026-11-10T17:24:28Z | value:https://api.github.com/repos/huggingface/datasets/issues/8966/labels{/name} | value:8966 | json:{"login": "Shizoqua", "id": 136805224, "node_id": "U_kgDOCCd7aA", "avatar_url": "https://avatars.githubusercontent.com/u/136805224?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Shizoqua", "html_url": "https://github.com/Shizoqua", "followers_url": "https://api.github.com/users/Shizoqua/followers", ... | value:False | true | |||||||||
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`Dataset.batch(by_column=...)` and `IterableDataset.batch(by_column=...)` treat a null key as equal to its neighbours, so rows from different groups end up in the same batch. A key column that contains only nulls raises instead.
### Steps to reproduce the bug
```python
from datasets import... | value:https://api.github.com/repos/huggingface/datasets/issues/8965/comments | value:I_kwDODunzps8AAAABdLLUPg | value:closed | value:1 | value:2026-11-10T17:24:29Z | value:https://api.github.com/repos/huggingface/datasets/issues/8965/labels{/name} | value:8965 | json:{"login": "Shizoqua", "id": 136805224, "node_id": "U_kgDOCCd7aA", "avatar_url": "https://avatars.githubusercontent.com/u/136805224?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Shizoqua", "html_url": "https://github.com/Shizoqua", "followers_url": "https://api.github.com/users/Shizoqua/followers", ... | true | |||||||
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Fixes #8755 — Audio arrays remain NumPy arrays when using PyTorch formatting.
### Changes made
- Updated the TorchCodec audio decoder to support returning PyTorch tensors.
- Updated `TorchFormatter` to convert Hugging Face audio decoder output to PyTorch-compatible output.
- Preserved existing Nu... | value:https://api.github.com/repos/huggingface/datasets/issues/8964/comments | value:PR_kwDODunzps8AAAABNXSGnw | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8964", "html_url": "https://github.com/huggingface/datasets/pull/8964", "diff_url": "https://github.com/huggingface/datasets/pull/8964.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8964.patch", "merged_at": null} | value:2026-11-07T17:23:29Z | value:https://api.github.com/repos/huggingface/datasets/issues/8964/labels{/name} | value:8964 | json:{"login": "josephabishak88", "id": 249288588, "node_id": "U_kgDODtvXjA", "avatar_url": "https://avatars.githubusercontent.com/u/249288588?v=4", "gravatar_id": "", "url": "https://api.github.com/users/josephabishak88", "html_url": "https://github.com/josephabishak88", "followers_url": "https://api.github.com/users/... | value:False | true | |||||||||||
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### `http(s)://` data files fail on a clean install
fsspec's `HTTPFileSystem` needs `aiohttp`, but `aiohttp` is only in th... | value:https://api.github.com/repos/huggingface/datasets/issues/8963/comments | value:PR_kwDODunzps8AAAABND8Yng | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8963", "html_url": "https://github.com/huggingface/datasets/pull/8963", "diff_url": "https://github.com/huggingface/datasets/pull/8963.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8963.patch", "merged_at": null} | value:2026-11-05T12:26:07Z | value:https://api.github.com/repos/huggingface/datasets/issues/8963/labels{/name} | value:8963 | json:{"login": "Marouane-elfadli", "id": 228027721, "node_id": "U_kgDODZdtSQ", "avatar_url": "https://avatars.githubusercontent.com/u/228027721?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Marouane-elfadli", "html_url": "https://github.com/Marouane-elfadli", "followers_url": "https://api.github.com/use... | value:False | true | |||||||||||
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### Summary
- Prioritize 3D dataset detection when a repository contains mesh files alongside image textures.
- Prevent image textures from causing a 3D dataset to be incorrectly detected as an `imagefolder`.
- Preserve the existing format-selection behavior for other formats.
### Tests
- `python -... | value:https://api.github.com/repos/huggingface/datasets/issues/8962/comments | value:PR_kwDODunzps8AAAABM_8D8g | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8962", "html_url": "https://github.com/huggingface/datasets/pull/8962", "diff_url": "https://github.com/huggingface/datasets/pull/8962.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8962.patch", "merged_at": null} | value:2026-11-05T06:39:31Z | value:https://api.github.com/repos/huggingface/datasets/issues/8962/labels{/name} | value:8962 | json:{"login": "bhumika-231206", "id": 351443745, "node_id": "U_kgDOFPKbIQ", "avatar_url": "https://avatars.githubusercontent.com/u/351443745?v=4", "gravatar_id": "", "url": "https://api.github.com/users/bhumika-231206", "html_url": "https://github.com/bhumika-231206", "followers_url": "https://api.github.com/users/bhu... | value:False | true |
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