reactions string | labels string | performed_via_github_app string | milestone string | assignee string | html_url string | assignees string | timeline_url string | issue_field_values string | id string | repository_url string | url string | title string | issue_dependencies_summary string | created_at string | state_reason string | type string | sub_issues_summary string | author_association string | closed_by string | events_url string | locked string | closed_at string | pinned_comment string | body string | comments_url string | node_id string | active_lock_reason string | state string | comments string | pull_request string | updated_at string | labels_url string | number string | user string | draft string | is_paul_request bool |
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`Dataset.__getitem__` accepts Python negative indices (`ds[-1]`, `ds[[-1]]`), and `_check_valid_indices_value` already allows them in `select`. Building the indices mapping still passed those values to `pa.array(..., type=uint64)`, which raised `OverflowError`.
Resolve negatives to absolute posit... | value:https://api.github.com/repos/huggingface/datasets/issues/8679/comments | value:PR_kwDODunzps8AAAABE86e4Q | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8679", "html_url": "https://github.com/huggingface/datasets/pull/8679", "diff_url": "https://github.com/huggingface/datasets/pull/8679.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8679.patch", "merged_at": null} | value:2026-09-24T14:40:00Z | value:https://api.github.com/repos/huggingface/datasets/issues/8679/labels{/name} | value:8679 | json:{"login": "MohammadHijjawi97", "id": 51020382, "node_id": "MDQ6VXNlcjUxMDIwMzgy", "avatar_url": "https://avatars.githubusercontent.com/u/51020382?v=4", "gravatar_id": "", "url": "https://api.github.com/users/MohammadHijjawi97", "html_url": "https://github.com/MohammadHijjawi97", "followers_url": "https://api.githu... | value:False | true | |||||||||||
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---
Allow `huggingface_hub` 2.x by bumping the upper bound to `<3.0` (lower bound unchanged).
`huggingface_hub` 2.0 was just released ([release notes](https://github.com/huggingface/huggingfac... | value:https://api.github.com/repos/huggingface/datasets/issues/8678/comments | value:PR_kwDODunzps8AAAABE7gB8w | value:closed | value:2 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8678", "html_url": "https://github.com/huggingface/datasets/pull/8678", "diff_url": "https://github.com/huggingface/datasets/pull/8678.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8678.patch", "merged_at": "2026-10-05T14:00:33Z"} | value:2026-10-05T14:00:34Z | value:https://api.github.com/repos/huggingface/datasets/issues/8678/labels{/name} | value:8678 | json:{"login": "Wauplin", "id": 11801849, "node_id": "MDQ6VXNlcjExODAxODQ5", "avatar_url": "https://avatars.githubusercontent.com/u/11801849?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Wauplin", "html_url": "https://github.com/Wauplin", "followers_url": "https://api.github.com/users/Wauplin/followers"... | value:False | true | |||||||||
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`GenBank._parse_location_node` computes the aggregate span of a `join`/`order` location from the *positional* first and last parts:
```python
location["start"] = located[0]["start"]
location["end"] = located[-1]["end"]
```
This assumes the parts are listed in ascending genomic order. They are... | value:https://api.github.com/repos/huggingface/datasets/issues/8677/comments | value:PR_kwDODunzps8AAAABE2uIHg | value:closed | value:4 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8677", "html_url": "https://github.com/huggingface/datasets/pull/8677", "diff_url": "https://github.com/huggingface/datasets/pull/8677.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8677.patch", "merged_at": "2026-10-05T12:47:37Z"} | value:2026-10-05T12:47:38Z | value:https://api.github.com/repos/huggingface/datasets/issues/8677/labels{/name} | value:8677 | json:{"login": "Linxiushen", "id": 142557582, "node_id": "U_kgDOCH9Bjg", "avatar_url": "https://avatars.githubusercontent.com/u/142557582?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Linxiushen", "html_url": "https://github.com/Linxiushen", "followers_url": "https://api.github.com/users/Linxiushen/foll... | value:False | true | |||||||||
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`load_dataset("json")` inferred each JSONL chunk on its own, then cast later chunks onto the first chunk's columns. When `chunksize` split sorted mixed shapes, a later shape with new keys failed that cast.
Before taking the schema from the first table, cast every chunk table to the union schema (`p... | value:https://api.github.com/repos/huggingface/datasets/issues/8676/comments | value:PR_kwDODunzps8AAAABE2Y-3Q | value:open | value:7 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8676", "html_url": "https://github.com/huggingface/datasets/pull/8676", "diff_url": "https://github.com/huggingface/datasets/pull/8676.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8676.patch", "merged_at": null} | value:2026-10-20T01:20:56Z | value:https://api.github.com/repos/huggingface/datasets/issues/8676/labels{/name} | value:8676 | json:{"login": "Dmao233", "id": 164994318, "node_id": "U_kgDOCdWdDg", "avatar_url": "https://avatars.githubusercontent.com/u/164994318?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Dmao233", "html_url": "https://github.com/Dmao233", "followers_url": "https://api.github.com/users/Dmao233/followers", "fol... | value:False | true | |||||||||||
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`load_dataset("json")` raises `DatasetGenerationError` ("column names don't match") on a valid JSONL file that mixes two record shapes, whenever the default 10MB `chunksize` splits the file so that different chunks see different sets of columns.
The JSON loader reads the file in `chunksize`... | value:https://api.github.com/repos/huggingface/datasets/issues/8675/comments | value:I_kwDODunzps8AAAABS3NzrQ | value:open | value:1 | value:2026-09-24T00:46:12Z | value:https://api.github.com/repos/huggingface/datasets/issues/8675/labels{/name} | value:8675 | json:{"login": "aksakalmustafa", "id": 27808107, "node_id": "MDQ6VXNlcjI3ODA4MTA3", "avatar_url": "https://avatars.githubusercontent.com/u/27808107?v=4", "gravatar_id": "", "url": "https://api.github.com/users/aksakalmustafa", "html_url": "https://github.com/aksakalmustafa", "followers_url": "https://api.github.com/use... | true | |||||||||||
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## Summary
`pq.ParquetWriter` matches per-column `compression` / `use_dictionary` / `column_encoding` against the leaf column paths (`train.list.element.input...`), but both `ParquetWriter._build_writer` and `ParquetDatasetWriter._write` keyed them by top-level feature name. Nested list/struct colum... | value:https://api.github.com/repos/huggingface/datasets/issues/8674/comments | value:PR_kwDODunzps8AAAABEwNmCg | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8674", "html_url": "https://github.com/huggingface/datasets/pull/8674", "diff_url": "https://github.com/huggingface/datasets/pull/8674.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8674.patch", "merged_at": "2026-10-05T12:48:35Z"} | value:2026-10-05T12:48:35Z | value:https://api.github.com/repos/huggingface/datasets/issues/8674/labels{/name} | value:8674 | json:{"login": "jayzuccarelli", "id": 11176606, "node_id": "MDQ6VXNlcjExMTc2NjA2", "avatar_url": "https://avatars.githubusercontent.com/u/11176606?v=4", "gravatar_id": "", "url": "https://api.github.com/users/jayzuccarelli", "html_url": "https://github.com/jayzuccarelli", "followers_url": "https://api.github.com/users/... | value:False | true | |||||||||
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### Actions pinned to commit SHAs
A version tag is mutable. Whoever controls an action's repository can move `v4`
to different code, and every workflow referencing `@v4` picks that up on the
next run with nothing to review. That is how `tj-actions/changed-files` shipped
a credential dumper... | value:https://api.github.com/repos/huggingface/datasets/issues/8673/comments | value:PR_kwDODunzps8AAAABEv5mcA | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8673", "html_url": "https://github.com/huggingface/datasets/pull/8673", "diff_url": "https://github.com/huggingface/datasets/pull/8673.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8673.patch", "merged_at": "2026-09-23T13:45:25Z"} | value:2026-09-23T13:45:27Z | value:https://api.github.com/repos/huggingface/datasets/issues/8673/labels{/name} | value:8673 | json:{"login": "hf-security-analysis[bot]", "id": 265538906, "node_id": "BOT_kgDOD9PNWg", "avatar_url": "https://avatars.githubusercontent.com/u/25720743?v=4", "gravatar_id": "", "url": "https://api.github.com/users/hf-security-analysis%5Bbot%5D", "html_url": "https://github.com/apps/hf-security-analysis", "followers_u... | value:False | true | |||||||||
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### `GITHUB_TOKEN` permissions scoped per job
A workflow with no `permissions:` block inherits whatever the repository or the
organization hands out, which is commonly write access to everything. Any step
in that job — including one inside a third-party action — can then push commits,
open... | value:https://api.github.com/repos/huggingface/datasets/issues/8672/comments | value:PR_kwDODunzps8AAAABEvBCPA | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8672", "html_url": "https://github.com/huggingface/datasets/pull/8672", "diff_url": "https://github.com/huggingface/datasets/pull/8672.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8672.patch", "merged_at": "2026-09-23T12:40:46Z"} | value:2026-09-23T12:40:48Z | value:https://api.github.com/repos/huggingface/datasets/issues/8672/labels{/name} | value:8672 | json:{"login": "hf-security-analysis[bot]", "id": 265538906, "node_id": "BOT_kgDOD9PNWg", "avatar_url": "https://avatars.githubusercontent.com/u/25720743?v=4", "gravatar_id": "", "url": "https://api.github.com/users/hf-security-analysis%5Bbot%5D", "html_url": "https://github.com/apps/hf-security-analysis", "followers_u... | value:False | true | |||||||||
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`push_to_hub()` and `to_parquet()` silently write nested (list/struct) columns UNCOMPRESSED, while flat columns get snappy. Measured impact: ~30x size inflation for nested-column datasets (a 114 MB JSONL with list/struct columns pushes as a 215 MB shard; the same data with compression applie... | value:https://api.github.com/repos/huggingface/datasets/issues/8671/comments | value:I_kwDODunzps8AAAABSt1Wow | value:closed | value:0 | value:2026-10-05T12:48:36Z | value:https://api.github.com/repos/huggingface/datasets/issues/8671/labels{/name} | value:8671 | json:{"login": "aksakalmustafa", "id": 27808107, "node_id": "MDQ6VXNlcjI3ODA4MTA3", "avatar_url": "https://avatars.githubusercontent.com/u/27808107?v=4", "gravatar_id": "", "url": "https://api.github.com/users/aksakalmustafa", "html_url": "https://github.com/aksakalmustafa", "followers_url": "https://api.github.com/use... | true | ||||||||
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This adds a dedicated iterable that preserves the source shard co... | value:https://api.github.com/repos/huggingface/datasets/issues/8670/comments | value:PR_kwDODunzps8AAAABEoMYbQ | value:closed | value:2 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8670", "html_url": "https://github.com/huggingface/datasets/pull/8670", "diff_url": "https://github.com/huggingface/datasets/pull/8670.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8670.patch", "merged_at": "2026-10-05T14:01:18Z"} | value:2026-10-05T14:01:19Z | value:https://api.github.com/repos/huggingface/datasets/issues/8670/labels{/name} | value:8670 | json:{"login": "yuchenwang3", "id": 93700456, "node_id": "U_kgDOBZXBaA", "avatar_url": "https://avatars.githubusercontent.com/u/93700456?v=4", "gravatar_id": "", "url": "https://api.github.com/users/yuchenwang3", "html_url": "https://github.com/yuchenwang3", "followers_url": "https://api.github.com/users/yuchenwang3/fo... | value:False | true | |||||||||
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I recently updated an env to datasets 5.0.1 and ended up with several of my DataLoader workers spinning. Spinning issue is on my end, and there is a viable workaround, but there's a change on the datasets side that triggered and may be unexpected / sub-optimal in common use cases.
Since 5.... | value:https://api.github.com/repos/huggingface/datasets/issues/8669/comments | value:I_kwDODunzps8AAAABSmBJZg | value:closed | value:0 | value:2026-10-05T14:01:20Z | value:https://api.github.com/repos/huggingface/datasets/issues/8669/labels{/name} | value:8669 | json:{"login": "rwightman", "id": 5702664, "node_id": "MDQ6VXNlcjU3MDI2NjQ=", "avatar_url": "https://avatars.githubusercontent.com/u/5702664?v=4", "gravatar_id": "", "url": "https://api.github.com/users/rwightman", "html_url": "https://github.com/rwightman", "followers_url": "https://api.github.com/users/rwightman/foll... | true | ||||||||
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`Spark._prepare_split_single` writes each worker's shards into `working_dir` and then moves them into the cache directory:
```python
if working_fpath != fpath:
for file in os.listdir(os.path.dirname(working... | value:https://api.github.com/repos/huggingface/datasets/issues/8668/comments | value:PR_kwDODunzps8AAAABEmyxFw | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8668", "html_url": "https://github.com/huggingface/datasets/pull/8668", "diff_url": "https://github.com/huggingface/datasets/pull/8668.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8668.patch", "merged_at": null} | value:2026-09-22T15:50:15Z | value:https://api.github.com/repos/huggingface/datasets/issues/8668/labels{/name} | value:8668 | json:{"login": "David-Wu1119", "id": 133224895, "node_id": "U_kgDOB_DZvw", "avatar_url": "https://avatars.githubusercontent.com/u/133224895?v=4", "gravatar_id": "", "url": "https://api.github.com/users/David-Wu1119", "html_url": "https://github.com/David-Wu1119", "followers_url": "https://api.github.com/users/David-Wu1... | value:False | true | |||||||||||
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```python
ds.set_format("numpy")
ds.features["label"].int2str(ds[0]["label... | value:https://api.github.com/repos/huggingface/datasets/issues/8667/comments | value:PR_kwDODunzps8AAAABEj84wg | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8667", "html_url": "https://github.com/huggingface/datasets/pull/8667", "diff_url": "https://github.com/huggingface/datasets/pull/8667.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8667.patch", "merged_at": null} | value:2026-09-25T08:30:26Z | value:https://api.github.com/repos/huggingface/datasets/issues/8667/labels{/name} | value:8667 | json:{"login": "MohammadHijjawi97", "id": 51020382, "node_id": "MDQ6VXNlcjUxMDIwMzgy", "avatar_url": "https://avatars.githubusercontent.com/u/51020382?v=4", "gravatar_id": "", "url": "https://api.github.com/users/MohammadHijjawi97", "html_url": "https://github.com/MohammadHijjawi97", "followers_url": "https://api.githu... | value:False | true | |||||||||||
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Fixed an outdated internal anchor link in docs/source/share.mdx pointing to repository_structure.mdx#define-your-splits-in-yaml (404) instead of the current heading anchor #define-your-splits-and-subsets-in-yaml.
## Why
A small, objectively-verifiable improvement (broken-link) found during a
daily open-s... | value:https://api.github.com/repos/huggingface/datasets/issues/8666/comments | value:PR_kwDODunzps8AAAABEjthDg | value:closed | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8666", "html_url": "https://github.com/huggingface/datasets/pull/8666", "diff_url": "https://github.com/huggingface/datasets/pull/8666.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8666.patch", "merged_at": "2026-09-30T15:13:53Z"} | value:2026-10-09T19:53:07Z | value:https://api.github.com/repos/huggingface/datasets/issues/8666/labels{/name} | value:8666 | json:{"login": "aarushkandukoori", "id": 66923736, "node_id": "MDQ6VXNlcjY2OTIzNzM2", "avatar_url": "https://avatars.githubusercontent.com/u/66923736?v=4", "gravatar_id": "", "url": "https://api.github.com/users/aarushkandukoori", "html_url": "https://github.com/aarushkandukoori", "followers_url": "https://api.github.c... | value:False | true | |||||||||
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**1. `IterableDataset.batch()` takes arrow-backed data out of arrow for no reason**
(`iterable_dataset.py`). It regroups via a Python transpose, `_batch_fn`, which converts arrow
to Python examples and transposes them back. #8126 already added an arrow path for this, gated
on `self._formatting.... | value:https://api.github.com/repos/huggingface/datasets/issues/8665/comments | value:PR_kwDODunzps8AAAABEjJXpA | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8665", "html_url": "https://github.com/huggingface/datasets/pull/8665", "diff_url": "https://github.com/huggingface/datasets/pull/8665.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8665.patch", "merged_at": "2026-10-05T12:51:00Z"} | value:2026-10-05T12:51:01Z | value:https://api.github.com/repos/huggingface/datasets/issues/8665/labels{/name} | value:8665 | json:{"login": "Yonghui-Lee", "id": 49152905, "node_id": "MDQ6VXNlcjQ5MTUyOTA1", "avatar_url": "https://avatars.githubusercontent.com/u/49152905?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Yonghui-Lee", "html_url": "https://github.com/Yonghui-Lee", "followers_url": "https://api.github.com/users/Yonghu... | value:False | true | |||||||||
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`NumpyFormatter._consolidate` only stacks a column when every element is an `np.ndarray`. Numpy scalars are `np.generic`, not `np.ndarray`, so any path that hands the formatter a list of scalars falls into the `dtype=object` branch:
- `IterableDataset.batch()` regroups with a python transpose (`{k: [... | value:https://api.github.com/repos/huggingface/datasets/issues/8664/comments | value:PR_kwDODunzps8AAAABEjG7xA | value:closed | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8664", "html_url": "https://github.com/huggingface/datasets/pull/8664", "diff_url": "https://github.com/huggingface/datasets/pull/8664.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8664.patch", "merged_at": null} | value:2026-10-12T16:48:28Z | value:https://api.github.com/repos/huggingface/datasets/issues/8664/labels{/name} | value:8664 | json:{"login": "jayzuccarelli", "id": 11176606, "node_id": "MDQ6VXNlcjExMTc2NjA2", "avatar_url": "https://avatars.githubusercontent.com/u/11176606?v=4", "gravatar_id": "", "url": "https://api.github.com/users/jayzuccarelli", "html_url": "https://github.com/jayzuccarelli", "followers_url": "https://api.github.com/users/... | value:False | true | |||||||||
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`NumpyFormatter._consolidate` builds a typed array only when every element is an `np.ndarray`. numpy **scalars** are `np.number`, not `np.ndarray`.
### Face 1 — `IterableDataset.batch()` on an arrow-backed dataset
`.batch()` regroups via a Python transpose
(`_batch_fn = lambda unbatched: {... | value:https://api.github.com/repos/huggingface/datasets/issues/8663/comments | value:I_kwDODunzps8AAAABSgtelw | value:closed | value:0 | value:2026-10-05T12:51:02Z | value:https://api.github.com/repos/huggingface/datasets/issues/8663/labels{/name} | value:8663 | json:{"login": "Yonghui-Lee", "id": 49152905, "node_id": "MDQ6VXNlcjQ5MTUyOTA1", "avatar_url": "https://avatars.githubusercontent.com/u/49152905?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Yonghui-Lee", "html_url": "https://github.com/Yonghui-Lee", "followers_url": "https://api.github.com/users/Yonghu... | true | ||||||||
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Non-contiguous selections and shuffles still leave an indices mapping. Querying a JSON export batch then produces one Arrow chunk per selected row, making conversion to pandas expensive. Combine the queried batch before conversion, while keeping the... | value:https://api.github.com/repos/huggingface/datasets/issues/8662/comments | value:PR_kwDODunzps8AAAABEiYJWA | value:closed | value:2 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8662", "html_url": "https://github.com/huggingface/datasets/pull/8662", "diff_url": "https://github.com/huggingface/datasets/pull/8662.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8662.patch", "merged_at": "2026-10-05T14:03:27Z"} | value:2026-10-06T00:05:17Z | value:https://api.github.com/repos/huggingface/datasets/issues/8662/labels{/name} | value:8662 | json:{"login": "aprylewu", "id": 129849514, "node_id": "U_kgDOB71Yqg", "avatar_url": "https://avatars.githubusercontent.com/u/129849514?v=4", "gravatar_id": "", "url": "https://api.github.com/users/aprylewu", "html_url": "https://github.com/aprylewu", "followers_url": "https://api.github.com/users/aprylewu/followers", ... | value:False | true | |||||||||
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Eight checks in the library validate a split name with `re.match(_split_re, name)` and,
when it fails, raise `Split name should match '^\w+(\.\w+)*$' but got '<name>'`. The
message promises a full match, but `"$"` also matches right before a newline at the end
of the string, so a name such as `"train\... | value:https://api.github.com/repos/huggingface/datasets/issues/8661/comments | value:PR_kwDODunzps8AAAABEha4Pw | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8661", "html_url": "https://github.com/huggingface/datasets/pull/8661", "diff_url": "https://github.com/huggingface/datasets/pull/8661.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8661.patch", "merged_at": null} | value:2026-09-22T04:23:19Z | value:https://api.github.com/repos/huggingface/datasets/issues/8661/labels{/name} | value:8661 | json:{"login": "Rodrigo-Palma", "id": 86628053, "node_id": "MDQ6VXNlcjg2NjI4MDUz", "avatar_url": "https://avatars.githubusercontent.com/u/86628053?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Rodrigo-Palma", "html_url": "https://github.com/Rodrigo-Palma", "followers_url": "https://api.github.com/users/... | value:False | true | |||||||||||
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With declared languages, `TranslationVariableLanguages` raises a `ValueError` for `{}`, `{"en": []}`, and other inputs containing no translations. Return `{"language": [], "translation": []}` when normalization produces no translation pairs, after validating the language names.
Regression tests cov... | value:https://api.github.com/repos/huggingface/datasets/issues/8660/comments | value:PR_kwDODunzps8AAAABEe8Egg | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8660", "html_url": "https://github.com/huggingface/datasets/pull/8660", "diff_url": "https://github.com/huggingface/datasets/pull/8660.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8660.patch", "merged_at": null} | value:2026-09-21T20:30:05Z | value:https://api.github.com/repos/huggingface/datasets/issues/8660/labels{/name} | value:8660 | json:{"login": "HuaTNA", "id": 126794161, "node_id": "U_kgDOB465sQ", "avatar_url": "https://avatars.githubusercontent.com/u/126794161?v=4", "gravatar_id": "", "url": "https://api.github.com/users/HuaTNA", "html_url": "https://github.com/HuaTNA", "followers_url": "https://api.github.com/users/HuaTNA/followers", "followi... | value:False | true | |||||||||||
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With an explicit language list, `TranslationVariableLanguages.encode_example()`
raises `ValueError: not enough values to unpack (expected 2, got 0)` for `{}`,
`{"en": []}`, or `{"en": [], "fr": []}`. The same inputs also prevent
`Dataset.from_dict()` from constructing a dataset.
The equivale... | value:https://api.github.com/repos/huggingface/datasets/issues/8659/comments | value:I_kwDODunzps8AAAABSZAFlA | value:open | value:0 | value:2026-09-21T15:38:25Z | value:https://api.github.com/repos/huggingface/datasets/issues/8659/labels{/name} | value:8659 | json:{"login": "HuaTNA", "id": 126794161, "node_id": "U_kgDOB465sQ", "avatar_url": "https://avatars.githubusercontent.com/u/126794161?v=4", "gravatar_id": "", "url": "https://api.github.com/users/HuaTNA", "html_url": "https://github.com/HuaTNA", "followers_url": "https://api.github.com/users/HuaTNA/followers", "followi... | true | |||||||||||
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IterableDataset._push_parquet_shards_to_hub() then crashed at the decodable-co... | value:https://api.github.com/repos/huggingface/datasets/issues/8658/comments | value:PR_kwDODunzps8AAAABEcT27w | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8658", "html_url": "https://github.com/huggingface/datasets/pull/8658", "diff_url": "https://github.com/huggingface/datasets/pull/8658.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8658.patch", "merged_at": "2026-09-24T14:52:43Z"} | value:2026-09-24T14:52:44Z | value:https://api.github.com/repos/huggingface/datasets/issues/8658/labels{/name} | value:8658 | json:{"login": "davanstrien", "id": 8995957, "node_id": "MDQ6VXNlcjg5OTU5NTc=", "avatar_url": "https://avatars.githubusercontent.com/u/8995957?v=4", "gravatar_id": "", "url": "https://api.github.com/users/davanstrien", "html_url": "https://github.com/davanstrien", "followers_url": "https://api.github.com/users/davanstr... | value:False | true | |||||||||
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- `docs/source/share.mdx`: `huggingface-cli login` → `hf auth login`, `hug... | value:https://api.github.com/repos/huggingface/datasets/issues/8657/comments | value:PR_kwDODunzps8AAAABEbsYug | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8657", "html_url": "https://github.com/huggingface/datasets/pull/8657", "diff_url": "https://github.com/huggingface/datasets/pull/8657.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8657.patch", "merged_at": "2026-09-21T16:12:41Z"} | value:2026-09-21T16:12:43Z | value:https://api.github.com/repos/huggingface/datasets/issues/8657/labels{/name} | value:8657 | json:{"login": "Wauplin", "id": 11801849, "node_id": "MDQ6VXNlcjExODAxODQ5", "avatar_url": "https://avatars.githubusercontent.com/u/11801849?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Wauplin", "html_url": "https://github.com/Wauplin", "followers_url": "https://api.github.com/users/Wauplin/followers"... | value:False | true | |||||||||
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```python
def size_str(size_in_bytes):
"""Returns a human readable size string.
If size_in_bytes is None, then returns "Unknown size".
...
"""
if not size_in_bytes:
return "Unknown size"
```
The ... | value:https://api.github.com/repos/huggingface/datasets/issues/8655/comments | value:PR_kwDODunzps8AAAABEa6MSg | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8655", "html_url": "https://github.com/huggingface/datasets/pull/8655", "diff_url": "https://github.com/huggingface/datasets/pull/8655.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8655.patch", "merged_at": null} | value:2026-09-21T12:44:49Z | value:https://api.github.com/repos/huggingface/datasets/issues/8655/labels{/name} | value:8655 | json:{"login": "Rodrigo-Palma", "id": 86628053, "node_id": "MDQ6VXNlcjg2NjI4MDUz", "avatar_url": "https://avatars.githubusercontent.com/u/86628053?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Rodrigo-Palma", "html_url": "https://github.com/Rodrigo-Palma", "followers_url": "https://api.github.com/users/... | value:False | true | |||||||||||
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Long lock filenames are shortened with Python's process-randomized string hash. Independent processes can therefore acquire different lock files for the same original path, bypassing mutual exclusion. This can affect the cache-directory lock in `DatasetBuilder`, where the directory path is flattened... | value:https://api.github.com/repos/huggingface/datasets/issues/8654/comments | value:PR_kwDODunzps8AAAABEaGD5g | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8654", "html_url": "https://github.com/huggingface/datasets/pull/8654", "diff_url": "https://github.com/huggingface/datasets/pull/8654.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8654.patch", "merged_at": null} | value:2026-09-21T11:18:46Z | value:https://api.github.com/repos/huggingface/datasets/issues/8654/labels{/name} | value:8654 | json:{"login": "Yang1107-wzy", "id": 193335484, "node_id": "U_kgDOC4YQvA", "avatar_url": "https://avatars.githubusercontent.com/u/193335484?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Yang1107-wzy", "html_url": "https://github.com/Yang1107-wzy", "followers_url": "https://api.github.com/users/Yang1107-... | value:False | true | |||||||||||
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`FileLock.hash_filename_if_too_long()` uses Python's `hash(filename)` to shorten long lock filenames. String hashes vary between independently started Python processes, so two processes given the same long lock path can lock different files and both enter the protected section.
This affects... | value:https://api.github.com/repos/huggingface/datasets/issues/8653/comments | value:I_kwDODunzps8AAAABSWGAVg | value:open | value:0 | value:2026-09-21T11:02:34Z | value:https://api.github.com/repos/huggingface/datasets/issues/8653/labels{/name} | value:8653 | json:{"login": "Yang1107-wzy", "id": 193335484, "node_id": "U_kgDOC4YQvA", "avatar_url": "https://avatars.githubusercontent.com/u/193335484?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Yang1107-wzy", "html_url": "https://github.com/Yang1107-wzy", "followers_url": "https://api.github.com/users/Yang1107-... | true | |||||||||||
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```python
>>> import io, pandas as pd
>>> pd.read_json(io.StringIO('{"v": 0.7}\n'), lines=True)["v"][0]
np.float64(0.7000000000000001)
>>> pd.read_json(io.Stri... | value:https://api.github.com/repos/huggingface/datasets/issues/8652/comments | value:PR_kwDODunzps8AAAABEXfrSQ | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8652", "html_url": "https://github.com/huggingface/datasets/pull/8652", "diff_url": "https://github.com/huggingface/datasets/pull/8652.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8652.patch", "merged_at": null} | value:2026-09-21T04:49:51Z | value:https://api.github.com/repos/huggingface/datasets/issues/8652/labels{/name} | value:8652 | json:{"login": "Linxiushen", "id": 142557582, "node_id": "U_kgDOCH9Bjg", "avatar_url": "https://avatars.githubusercontent.com/u/142557582?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Linxiushen", "html_url": "https://github.com/Linxiushen", "followers_url": "https://api.github.com/users/Linxiushen/foll... | value:False | true | |||||||||||
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## Summary
- passes the new Python 3.14 `_batch_setitems` object argument when the custom datasets pickler is called through the old two-argument path
- keeps the existing key sorting behavior for stable fingerprints
- adds a regression test that simulates the Python 3.14 parent pickler sign... | value:https://api.github.com/repos/huggingface/datasets/issues/8651/comments | value:PR_kwDODunzps8AAAABEWMWvw | value:open | value:2 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8651", "html_url": "https://github.com/huggingface/datasets/pull/8651", "diff_url": "https://github.com/huggingface/datasets/pull/8651.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8651.patch", "merged_at": null} | value:2026-10-05T13:59:17Z | value:https://api.github.com/repos/huggingface/datasets/issues/8651/labels{/name} | value:8651 | json:{"login": "FranciscoMaxwell", "id": 79481236, "node_id": "MDQ6VXNlcjc5NDgxMjM2", "avatar_url": "https://avatars.githubusercontent.com/u/79481236?v=4", "gravatar_id": "", "url": "https://api.github.com/users/FranciscoMaxwell", "html_url": "https://github.com/FranciscoMaxwell", "followers_url": "https://api.github.c... | value:False | true | |||||||||||
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When datasets are stored in nested remote directories, loading a child directory first can make loading its parent fail with `FileNotFoundError` for `state.json`. Reloading a remote dataset after its contents change can also return the previous rows.
Each load now gets a fresh directory inside the ma... | value:https://api.github.com/repos/huggingface/datasets/issues/8650/comments | value:PR_kwDODunzps8AAAABEU_uIg | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8650", "html_url": "https://github.com/huggingface/datasets/pull/8650", "diff_url": "https://github.com/huggingface/datasets/pull/8650.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8650.patch", "merged_at": null} | value:2026-09-20T18:24:16Z | value:https://api.github.com/repos/huggingface/datasets/issues/8650/labels{/name} | value:8650 | json:{"login": "1fanwang", "id": 21269208, "node_id": "MDQ6VXNlcjIxMjY5MjA4", "avatar_url": "https://avatars.githubusercontent.com/u/21269208?v=4", "gravatar_id": "", "url": "https://api.github.com/users/1fanwang", "html_url": "https://github.com/1fanwang", "followers_url": "https://api.github.com/users/1fanwang/follow... | value:False | true | |||||||||||
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```python
>>> from datasets... | value:https://api.github.com/repos/huggingface/datasets/issues/8649/comments | value:PR_kwDODunzps8AAAABEUKrGg | value:open | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8649", "html_url": "https://github.com/huggingface/datasets/pull/8649", "diff_url": "https://github.com/huggingface/datasets/pull/8649.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8649.patch", "merged_at": null} | value:2026-09-21T12:59:51Z | value:https://api.github.com/repos/huggingface/datasets/issues/8649/labels{/name} | value:8649 | json:{"login": "Rodrigo-Palma", "id": 86628053, "node_id": "MDQ6VXNlcjg2NjI4MDUz", "avatar_url": "https://avatars.githubusercontent.com/u/86628053?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Rodrigo-Palma", "html_url": "https://github.com/Rodrigo-Palma", "followers_url": "https://api.github.com/users/... | value:False | true | |||||||||||
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The `eval` packaged module reads sample log JSON files with the locale's preferred encoding:
```python
for sample_file in sample_files:
with open(sample_file) as f:
sample = json.load(f)
```
On Windows with a non-UTF-8 locale (e.g. cp936/GBK), any sample containing non-ASCII text — CJK p... | value:https://api.github.com/repos/huggingface/datasets/issues/8648/comments | value:PR_kwDODunzps8AAAABETo7Jg | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8648", "html_url": "https://github.com/huggingface/datasets/pull/8648", "diff_url": "https://github.com/huggingface/datasets/pull/8648.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8648.patch", "merged_at": null} | value:2026-09-20T12:37:44Z | value:https://api.github.com/repos/huggingface/datasets/issues/8648/labels{/name} | value:8648 | json:{"login": "dltsum", "id": 196378929, "node_id": "U_kgDOC7SBMQ", "avatar_url": "https://avatars.githubusercontent.com/u/196378929?v=4", "gravatar_id": "", "url": "https://api.github.com/users/dltsum", "html_url": "https://github.com/dltsum", "followers_url": "https://api.github.com/users/dltsum/followers", "followi... | value:False | true | |||||||||||
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Return a new dataset wrapper when no function is supplied. Returning a new object, rather than `self`, keeps changes to its epoch from affecting the input dataset.
Tests cover t... | value:https://api.github.com/repos/huggingface/datasets/issues/8647/comments | value:PR_kwDODunzps8AAAABETSp6g | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8647", "html_url": "https://github.com/huggingface/datasets/pull/8647", "diff_url": "https://github.com/huggingface/datasets/pull/8647.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8647.patch", "merged_at": null} | value:2026-09-20T15:48:40Z | value:https://api.github.com/repos/huggingface/datasets/issues/8647/labels{/name} | value:8647 | json:{"login": "YaoxinHuang", "id": 174019195, "node_id": "U_kgDOCl9Sew", "avatar_url": "https://avatars.githubusercontent.com/u/174019195?v=4", "gravatar_id": "", "url": "https://api.github.com/users/YaoxinHuang", "html_url": "https://github.com/YaoxinHuang", "followers_url": "https://api.github.com/users/YaoxinHuang/... | value:False | true | |||||||||||
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When `drop_last_batch=True` and a shard is smaller than `batch_size`, `_map_single` iterates zero batches, so the map function never runs and `update_data` stays `None`. The final branch then yielded the original shard back unchanged (3 rows instead of 0), disagreeing with `IterableDataset.batch` an... | value:https://api.github.com/repos/huggingface/datasets/issues/8646/comments | value:PR_kwDODunzps8AAAABER02Gw | value:open | value:3 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8646", "html_url": "https://github.com/huggingface/datasets/pull/8646", "diff_url": "https://github.com/huggingface/datasets/pull/8646.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8646.patch", "merged_at": null} | value:2026-10-06T17:37:57Z | value:https://api.github.com/repos/huggingface/datasets/issues/8646/labels{/name} | value:8646 | json:{"login": "SIDDARTHAREDDY8", "id": 75976672, "node_id": "MDQ6VXNlcjc1OTc2Njcy", "avatar_url": "https://avatars.githubusercontent.com/u/75976672?v=4", "gravatar_id": "", "url": "https://api.github.com/users/SIDDARTHAREDDY8", "html_url": "https://github.com/SIDDARTHAREDDY8", "followers_url": "https://api.github.com/... | value:False | true | |||||||||||
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class_encode_column currently rejects list-valued columns even when the feature is List(Value(...)). That makes multi-label datasets fall back to manually collecting labels and calling cast_column.
This change accepts List(Value(...)) columns, collects class names from the list elements, and maps ea... | value:https://api.github.com/repos/huggingface/datasets/issues/8645/comments | value:PR_kwDODunzps8AAAABELOooA | value:open | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8645", "html_url": "https://github.com/huggingface/datasets/pull/8645", "diff_url": "https://github.com/huggingface/datasets/pull/8645.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8645.patch", "merged_at": null} | value:2026-10-04T06:57:03Z | value:https://api.github.com/repos/huggingface/datasets/issues/8645/labels{/name} | value:8645 | json:{"login": "lindicaphxag-tech", "id": 237745757, "node_id": "U_kgDODiu2XQ", "avatar_url": "https://avatars.githubusercontent.com/u/237745757?v=4", "gravatar_id": "", "url": "https://api.github.com/users/lindicaphxag-tech", "html_url": "https://github.com/lindicaphxag-tech", "followers_url": "https://api.github.com/... | value:False | true | |||||||||||
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When `set_pytorch=True` is passed to `temp_seed`, the context manager saves and restores the PyTorch CPU and CUDA RNG states. On non-CUDA accelerators (e.g. Ascend NPU), the device RNG state is silently left unseeded during the context, breaking reproducibility across seeded dataset transforms.
T... | value:https://api.github.com/repos/huggingface/datasets/issues/8644/comments | value:PR_kwDODunzps8AAAABEFgEDA | value:open | value:4 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8644", "html_url": "https://github.com/huggingface/datasets/pull/8644", "diff_url": "https://github.com/huggingface/datasets/pull/8644.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8644.patch", "merged_at": null} | value:2026-10-31T08:04:20Z | value:https://api.github.com/repos/huggingface/datasets/issues/8644/labels{/name} | value:8644 | json:{"login": "li-lizhe", "id": 82501526, "node_id": "MDQ6VXNlcjgyNTAxNTI2", "avatar_url": "https://avatars.githubusercontent.com/u/82501526?v=4", "gravatar_id": "", "url": "https://api.github.com/users/li-lizhe", "html_url": "https://github.com/li-lizhe", "followers_url": "https://api.github.com/users/li-lizhe/follow... | value:False | true | |||||||||||
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`DatasetDict.cast` now accepts the same processing arguments as `Dataset.cast` (`batch_size`, `keep_in_memory`, `load_from_cache_file`, `writer_batch_size`, `num_proc`) plus `cache_file_names` as a per-split dict, and forwards them to each split.
## Why
`Dataset.cast` runs through `map` and exposes the... | value:https://api.github.com/repos/huggingface/datasets/issues/8643/comments | value:PR_kwDODunzps8AAAABECvV0A | value:open | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8643", "html_url": "https://github.com/huggingface/datasets/pull/8643", "diff_url": "https://github.com/huggingface/datasets/pull/8643.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8643.patch", "merged_at": null} | value:2026-09-30T17:37:21Z | value:https://api.github.com/repos/huggingface/datasets/issues/8643/labels{/name} | value:8643 | json:{"login": "RizgarOzan", "id": 236759479, "node_id": "U_kgDODhyptw", "avatar_url": "https://avatars.githubusercontent.com/u/236759479?v=4", "gravatar_id": "", "url": "https://api.github.com/users/RizgarOzan", "html_url": "https://github.com/RizgarOzan", "followers_url": "https://api.github.com/users/RizgarOzan/foll... | value:False | true | |||||||||||
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Line numbers below are against `main`.
## The problem
`fi... | value:https://api.github.com/repos/huggingface/datasets/issues/8642/comments | value:PR_kwDODunzps8AAAABEBWK3A | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8642", "html_url": "https://github.com/huggingface/datasets/pull/8642", "diff_url": "https://github.com/huggingface/datasets/pull/8642.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8642.patch", "merged_at": null} | value:2026-11-02T12:11:56Z | value:https://api.github.com/repos/huggingface/datasets/issues/8642/labels{/name} | value:8642 | json:{"login": "antnewman", "id": 13312614, "node_id": "MDQ6VXNlcjEzMzEyNjE0", "avatar_url": "https://avatars.githubusercontent.com/u/13312614?v=4", "gravatar_id": "", "url": "https://api.github.com/users/antnewman", "html_url": "https://github.com/antnewman", "followers_url": "https://api.github.com/users/antnewman/fo... | value:False | true | |||||||||||
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### What is slow
Building a `Dataset` from a whole ndarray converts it row by row and then concatenates. On this machine, 3200 rows of 64x64 float32, a 50 MB payload:
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### The problem
When a `map()` function returns values that do not match the declared features, the error never says which column is at fault. On a wide dataset that leaves you bisecting your own function to find it.
Measured on `main`, all four mismatch shapes:
| case | before |
|---|---|
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### What users hit
A column stored as `float64` comes back as `float32`:
```python
>>> ds = Dataset.from_dict({"v": [[3.141592653589793, 1e300]]},
... features=Features({"v": List(Value("float64"))}))
>>> ds.with_format("numpy")[0]["v"]
array([3.1415927e+00, inf],... | value:https://api.github.com/repos/huggingface/datasets/issues/8639/comments | value:PR_kwDODunzps8AAAABEAGwkQ | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8639", "html_url": "https://github.com/huggingface/datasets/pull/8639", "diff_url": "https://github.com/huggingface/datasets/pull/8639.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8639.patch", "merged_at": null} | value:2026-09-17T22:28:49Z | value:https://api.github.com/repos/huggingface/datasets/issues/8639/labels{/name} | value:8639 | json:{"login": "behroozazarkhalili", "id": 80390531, "node_id": "MDQ6VXNlcjgwMzkwNTMx", "avatar_url": "https://avatars.githubusercontent.com/u/80390531?v=4", "gravatar_id": "", "url": "https://api.github.com/users/behroozazarkhalili", "html_url": "https://github.com/behroozazarkhalili", "followers_url": "https://api.gi... | value:False | true | |||||||||||
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### The problem
`load_dataset` takes cache locks through `filelock`, which uses `flock`/`fcntl`. Some network filesystems do not implement those calls, so the lock fails and the dataset never loads. The reporter hit this on an NFS-mounted Weka mount. Moving `cache_dir` to local disk is not a way o... | value:https://api.github.com/repos/huggingface/datasets/issues/8638/comments | value:PR_kwDODunzps8AAAABD_MSeA | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8638", "html_url": "https://github.com/huggingface/datasets/pull/8638", "diff_url": "https://github.com/huggingface/datasets/pull/8638.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8638.patch", "merged_at": null} | value:2026-09-17T21:03:59Z | value:https://api.github.com/repos/huggingface/datasets/issues/8638/labels{/name} | value:8638 | json:{"login": "behroozazarkhalili", "id": 80390531, "node_id": "MDQ6VXNlcjgwMzkwNTMx", "avatar_url": "https://avatars.githubusercontent.com/u/80390531?v=4", "gravatar_id": "", "url": "https://api.github.com/users/behroozazarkhalili", "html_url": "https://github.com/behroozazarkhalili", "followers_url": "https://api.gi... | value:False | true | |||||||||||
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`datasets.utils._filelock.FileLock` silently discards every keyword argument except `lock_file`. Passing `timeout=` has no effect, and `is_singleton=True` raises instead of returning the cached lock.
The wrapper declares a variadic signature:
```python
# src/datasets/utils/_filelock.py
def... | value:https://api.github.com/repos/huggingface/datasets/issues/8637/comments | value:I_kwDODunzps8AAAABR1ujYg | value:open | value:2 | value:2026-09-24T07:24:10Z | value:https://api.github.com/repos/huggingface/datasets/issues/8637/labels{/name} | value:8637 | json:{"login": "behroozazarkhalili", "id": 80390531, "node_id": "MDQ6VXNlcjgwMzkwNTMx", "avatar_url": "https://avatars.githubusercontent.com/u/80390531?v=4", "gravatar_id": "", "url": "https://api.github.com/users/behroozazarkhalili", "html_url": "https://github.com/behroozazarkhalili", "followers_url": "https://api.gi... | true | |||||||||||
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> [!WARNING]
> **This narrows what the workflow can reach.** Job permissions were declared in `.github/workflows/ci.yml`, `.github/workflows/release-conda.yml`. Each job now gets only the scopes its steps were read to need — if one of them does somethin... | value:https://api.github.com/repos/huggingface/datasets/issues/8636/comments | value:PR_kwDODunzps8AAAABD5lZ2g | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8636", "html_url": "https://github.com/huggingface/datasets/pull/8636", "diff_url": "https://github.com/huggingface/datasets/pull/8636.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8636.patch", "merged_at": "2026-09-21T09:50:12Z"} | value:2026-09-21T09:50:14Z | value:https://api.github.com/repos/huggingface/datasets/issues/8636/labels{/name} | value:8636 | json:{"login": "hf-security-analysis[bot]", "id": 265538906, "node_id": "BOT_kgDOD9PNWg", "avatar_url": "https://avatars.githubusercontent.com/u/25720743?v=4", "gravatar_id": "", "url": "https://api.github.com/users/hf-security-analysis%5Bbot%5D", "html_url": "https://github.com/apps/hf-security-analysis", "followers_u... | value:False | true | |||||||||
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| Package | From | To |
| --- | --- | --- |
| [huggingface/doc-builder/.github/workflows/build_main_documentation.yml](https://github.com/huggingface/doc-builder) | `90b4ee2c10b81b5c1a6367c4e6fc9e2fb510a7e3` | `47c6b5880f408881e68ca60fed8c1de1e454eb01` |
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### Problem
Calls passing `pathlib.Path` objects (e.g. `ds.save_to_disk(Path(...))`, `Dataset.load_from_disk(Path(...))`, `DatasetDict.load_from_disk(Path(...))`, `DatasetInfo.from_directory(Path(...))`) fail with `TypeError: argument of type 'PosixPath' is not iterable` from `fsspec` because `url_t... | value:https://api.github.com/repos/huggingface/datasets/issues/8634/comments | value:PR_kwDODunzps8AAAABD5aG1A | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8634", "html_url": "https://github.com/huggingface/datasets/pull/8634", "diff_url": "https://github.com/huggingface/datasets/pull/8634.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8634.patch", "merged_at": null} | value:2026-09-17T08:46:38Z | value:https://api.github.com/repos/huggingface/datasets/issues/8634/labels{/name} | value:8634 | json:{"login": "bodapatisaikrishna", "id": 164990207, "node_id": "U_kgDOCdWM_w", "avatar_url": "https://avatars.githubusercontent.com/u/164990207?v=4", "gravatar_id": "", "url": "https://api.github.com/users/bodapatisaikrishna", "html_url": "https://github.com/bodapatisaikrishna", "followers_url": "https://api.github.c... | value:False | true | |||||||||||
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Fix: wrap dataset_path with str() before passing to url_to_fs in both load_from_disk and save... | value:https://api.github.com/repos/huggingface/datasets/issues/8633/comments | value:PR_kwDODunzps8AAAABD39Jpg | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8633", "html_url": "https://github.com/huggingface/datasets/pull/8633", "diff_url": "https://github.com/huggingface/datasets/pull/8633.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8633.patch", "merged_at": null} | value:2026-09-17T05:21:10Z | value:https://api.github.com/repos/huggingface/datasets/issues/8633/labels{/name} | value:8633 | json:{"login": "dafahaha", "id": 156556011, "node_id": "U_kgDOCVTa6w", "avatar_url": "https://avatars.githubusercontent.com/u/156556011?v=4", "gravatar_id": "", "url": "https://api.github.com/users/dafahaha", "html_url": "https://github.com/dafahaha", "followers_url": "https://api.github.com/users/dafahaha/followers", ... | value:False | true | |||||||||||
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`to_dict()` and `to_polars()` return generators even with `batched=False`, because both methods contain a `yield` in their batc... | value:https://api.github.com/repos/huggingface/datasets/issues/8632/comments | value:PR_kwDODunzps8AAAABD1zUVA | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8632", "html_url": "https://github.com/huggingface/datasets/pull/8632", "diff_url": "https://github.com/huggingface/datasets/pull/8632.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8632.patch", "merged_at": "2026-10-05T14:18:56Z"} | value:2026-10-05T14:19:54Z | value:https://api.github.com/repos/huggingface/datasets/issues/8632/labels{/name} | value:8632 | json:{"login": "cwklurks", "id": 147788030, "node_id": "U_kgDOCM8Q_g", "avatar_url": "https://avatars.githubusercontent.com/u/147788030?v=4", "gravatar_id": "", "url": "https://api.github.com/users/cwklurks", "html_url": "https://github.com/cwklurks", "followers_url": "https://api.github.com/users/cwklurks/followers", ... | value:False | true | |||||||||
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Validate `ClassLabel` values during table casts while keeping the metadata-only path for other features. | value:https://api.github.com/repos/huggingface/datasets/issues/8631/comments | value:PR_kwDODunzps8AAAABDus9TQ | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8631", "html_url": "https://github.com/huggingface/datasets/pull/8631", "diff_url": "https://github.com/huggingface/datasets/pull/8631.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8631.patch", "merged_at": null} | value:2026-09-17T06:49:14Z | value:https://api.github.com/repos/huggingface/datasets/issues/8631/labels{/name} | value:8631 | json:{"login": "Anakintano", "id": 126348043, "node_id": "U_kgDOB4frCw", "avatar_url": "https://avatars.githubusercontent.com/u/126348043?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Anakintano", "html_url": "https://github.com/Anakintano", "followers_url": "https://api.github.com/users/Anakintano/foll... | value:False | true | |||||||||||
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**`tests/test_builder.py::test_builder_as_dataset`**: `dataset.column_names == ["text"]` is missing its `assert`.
**`tests/commands/test_test.py::test_test_command`**: the loop over `DatasetInfo._INCLUDED_INFO_IN_YAML` en... | value:https://api.github.com/repos/huggingface/datasets/issues/8630/comments | value:PR_kwDODunzps8AAAABDpuXVQ | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8630", "html_url": "https://github.com/huggingface/datasets/pull/8630", "diff_url": "https://github.com/huggingface/datasets/pull/8630.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8630.patch", "merged_at": null} | value:2026-09-15T17:56:03Z | value:https://api.github.com/repos/huggingface/datasets/issues/8630/labels{/name} | value:8630 | json:{"login": "David-Wu1119", "id": 133224895, "node_id": "U_kgDOB_DZvw", "avatar_url": "https://avatars.githubusercontent.com/u/133224895?v=4", "gravatar_id": "", "url": "https://api.github.com/users/David-Wu1119", "html_url": "https://github.com/David-Wu1119", "followers_url": "https://api.github.com/users/David-Wu1... | value:False | true | |||||||||||
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Move task cleanup into `finally`, wait for all tracked tasks with `return_except... | value:https://api.github.com/repos/huggingface/datasets/issues/8629/comments | value:PR_kwDODunzps8AAAABDnkn6A | value:open | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8629", "html_url": "https://github.com/huggingface/datasets/pull/8629", "diff_url": "https://github.com/huggingface/datasets/pull/8629.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8629.patch", "merged_at": null} | value:2026-09-27T02:35:05Z | value:https://api.github.com/repos/huggingface/datasets/issues/8629/labels{/name} | value:8629 | json:{"login": "Kuang-xianxin", "id": 243476082, "node_id": "U_kgDODoMmcg", "avatar_url": "https://avatars.githubusercontent.com/u/243476082?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Kuang-xianxin", "html_url": "https://github.com/Kuang-xianxin", "followers_url": "https://api.github.com/users/Kuang-... | value:False | true | |||||||||||
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`tests/test_extract.py::test_tar_extract_insecure_files` errors in setup on an
unprivileged Windows machine:
```
OSError: [WinError 1314] A required privilege is not held by the client
```
The `tar_file_with_sym_link` fixture calls `os.symlink(...)` unconditionally, and
the test requests all three tar ... | value:https://api.github.com/repos/huggingface/datasets/issues/8628/comments | value:PR_kwDODunzps8AAAABDnd87Q | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8628", "html_url": "https://github.com/huggingface/datasets/pull/8628", "diff_url": "https://github.com/huggingface/datasets/pull/8628.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8628.patch", "merged_at": null} | value:2026-09-15T13:48:22Z | value:https://api.github.com/repos/huggingface/datasets/issues/8628/labels{/name} | value:8628 | json:{"login": "iam-kira", "id": 72202814, "node_id": "MDQ6VXNlcjcyMjAyODE0", "avatar_url": "https://avatars.githubusercontent.com/u/72202814?v=4", "gravatar_id": "", "url": "https://api.github.com/users/iam-kira", "html_url": "https://github.com/iam-kira", "followers_url": "https://api.github.com/users/iam-kira/follow... | value:False | true | |||||||||||
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When probabilistic `interleave_datasets` uses `all_exhausted_without_replacement`, an empty source starts as not exhausted. Its first draw appends an invalid source offset, producing a duplicate row from the next dataset or an `IndexError` when the empty source is last.
Mark empty sources exhausted... | value:https://api.github.com/repos/huggingface/datasets/issues/8627/comments | value:PR_kwDODunzps8AAAABDkG3uA | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8627", "html_url": "https://github.com/huggingface/datasets/pull/8627", "diff_url": "https://github.com/huggingface/datasets/pull/8627.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8627.patch", "merged_at": null} | value:2026-09-15T06:50:27Z | value:https://api.github.com/repos/huggingface/datasets/issues/8627/labels{/name} | value:8627 | json:{"login": "HaokaiDing", "id": 226810271, "node_id": "U_kgDODYTZnw", "avatar_url": "https://avatars.githubusercontent.com/u/226810271?v=4", "gravatar_id": "", "url": "https://api.github.com/users/HaokaiDing", "html_url": "https://github.com/HaokaiDing", "followers_url": "https://api.github.com/users/HaokaiDing/foll... | value:False | true | |||||||||||
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With probabilities and `stopping_strategy="all_exhausted_without_replacement"`, an empty map-style input can add a duplicate row from another source or cause an out-of-range index. This can happen when filtering one of the datasets before mixing them.
### Steps to reproduce
```python
from ... | value:https://api.github.com/repos/huggingface/datasets/issues/8626/comments | value:I_kwDODunzps8AAAABRVty8g | value:open | value:0 | value:2026-09-15T06:48:36Z | value:https://api.github.com/repos/huggingface/datasets/issues/8626/labels{/name} | value:8626 | json:{"login": "HaokaiDing", "id": 226810271, "node_id": "U_kgDODYTZnw", "avatar_url": "https://avatars.githubusercontent.com/u/226810271?v=4", "gravatar_id": "", "url": "https://api.github.com/users/HaokaiDing", "html_url": "https://github.com/HaokaiDing", "followers_url": "https://api.github.com/users/HaokaiDing/foll... | true | |||||||||||
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| Function | Docstring says | Signature has |
|---|---|---|
| `Dataset.train_test_split` | `train_cache_file_name`, `test_cache_file_name` |... | value:https://api.github.com/repos/huggingface/datasets/issues/8621/comments | value:PR_kwDODunzps8AAAABDgS_dQ | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8621", "html_url": "https://github.com/huggingface/datasets/pull/8621", "diff_url": "https://github.com/huggingface/datasets/pull/8621.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8621.patch", "merged_at": null} | value:2026-09-14T19:44:57Z | value:https://api.github.com/repos/huggingface/datasets/issues/8621/labels{/name} | value:8621 | json:{"login": "revanth-045", "id": 189280727, "node_id": "U_kgDOC0gx1w", "avatar_url": "https://avatars.githubusercontent.com/u/189280727?v=4", "gravatar_id": "", "url": "https://api.github.com/users/revanth-045", "html_url": "https://github.com/revanth-045", "followers_url": "https://api.github.com/users/revanth-045/... | value:False | true | |||||||||||
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Fixes #8618.
`DataFilesList.filter()` returns a filtered list of data files but reuses the
original, unfiltered `origin_metadata`. `origin_metadata` is parallel to the
file list (one entry per file describing where the file was resolved from), so
after filtering it no longer lines up with the files i... | value:https://api.github.com/repos/huggingface/datasets/issues/8620/comments | value:PR_kwDODunzps8AAAABDcE9bA | value:closed | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8620", "html_url": "https://github.com/huggingface/datasets/pull/8620", "diff_url": "https://github.com/huggingface/datasets/pull/8620.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8620.patch", "merged_at": null} | value:2026-10-05T08:18:33Z | value:https://api.github.com/repos/huggingface/datasets/issues/8620/labels{/name} | value:8620 | json:{"login": "betacatsling", "id": 113584199, "node_id": "U_kgDOBsUoRw", "avatar_url": "https://avatars.githubusercontent.com/u/113584199?v=4", "gravatar_id": "", "url": "https://api.github.com/users/betacatsling", "html_url": "https://github.com/betacatsling", "followers_url": "https://api.github.com/users/betacatsl... | value:False | true | |||||||||
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Fixes #8617.
`SplitDict.copy()` crashes with `AttributeError: 'SplitInfo' object has no
attribute 'get'` whenever the `SplitDict` holds `SplitInfo` objects (the normal
case after construction) and `dataset_name` is not passed explicitly.
In `SplitDict.from_split_dict`, the `dataset_name` fallback un... | value:https://api.github.com/repos/huggingface/datasets/issues/8619/comments | value:PR_kwDODunzps8AAAABDcE4ng | value:closed | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8619", "html_url": "https://github.com/huggingface/datasets/pull/8619", "diff_url": "https://github.com/huggingface/datasets/pull/8619.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8619.patch", "merged_at": null} | value:2026-10-05T08:18:32Z | value:https://api.github.com/repos/huggingface/datasets/issues/8619/labels{/name} | value:8619 | json:{"login": "betacatsling", "id": 113584199, "node_id": "U_kgDOBsUoRw", "avatar_url": "https://avatars.githubusercontent.com/u/113584199?v=4", "gravatar_id": "", "url": "https://api.github.com/users/betacatsling", "html_url": "https://github.com/betacatsling", "followers_url": "https://api.github.com/users/betacatsl... | value:False | true | |||||||||
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`DataFilesList` keeps `origin_metadata`, a list parallel to the file list where
each entry describes the origin of the file at the same index (e.g. the data
files pattern it was resolved from). After `filter()` removes some files, the
returned `DataFilesList` keeps the *unfiltered* `origin_metadat... | value:https://api.github.com/repos/huggingface/datasets/issues/8618/comments | value:I_kwDODunzps8AAAABRMJsdQ | value:open | value:2 | value:2026-11-03T06:29:15Z | value:https://api.github.com/repos/huggingface/datasets/issues/8618/labels{/name} | value:8618 | json:{"login": "betacatsling", "id": 113584199, "node_id": "U_kgDOBsUoRw", "avatar_url": "https://avatars.githubusercontent.com/u/113584199?v=4", "gravatar_id": "", "url": "https://api.github.com/users/betacatsling", "html_url": "https://github.com/betacatsling", "followers_url": "https://api.github.com/users/betacatsl... | true | ||||||||||
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`SplitDict.copy()` (and `SplitDict.from_split_dict`) crashes with
`AttributeError: 'SplitInfo' object has no attribute 'get'` whenever the split
dict contains `SplitInfo` objects and `dataset_name` is `None`.
## Reproduction
```python
from datasets import SplitDict, SplitInfo
split_dict = Split... | value:https://api.github.com/repos/huggingface/datasets/issues/8617/comments | value:I_kwDODunzps8AAAABRMJrig | value:open | value:1 | value:2026-10-18T10:37:28Z | value:https://api.github.com/repos/huggingface/datasets/issues/8617/labels{/name} | value:8617 | json:{"login": "betacatsling", "id": 113584199, "node_id": "U_kgDOBsUoRw", "avatar_url": "https://avatars.githubusercontent.com/u/113584199?v=4", "gravatar_id": "", "url": "https://api.github.com/users/betacatsling", "html_url": "https://github.com/betacatsling", "followers_url": "https://api.github.com/users/betacatsl... | true | |||||||||||
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Adds focused unit tests in `tests/test_dataset_name_invariants.py` verifying repository path identifier parsing:
- Confirms organization namespace and dataset name separation.
- Validates clean fallback handling for unnamespaced identifiers.
- Non-invasive, test-only addition.
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## Root cause
`ExtractManager.extract` decided "already extracted" (output file exists, or output directory non-empty) **before** `Extractor.extract` took the per-output `FileLock`, and the extractor wrote straight into the final path. With two jobs sharing a cache directory, job B saw job A's ha... | value:https://api.github.com/repos/huggingface/datasets/issues/8615/comments | value:PR_kwDODunzps8AAAABDS0bGw | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8615", "html_url": "https://github.com/huggingface/datasets/pull/8615", "diff_url": "https://github.com/huggingface/datasets/pull/8615.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8615.patch", "merged_at": null} | value:2026-09-13T00:10:13Z | value:https://api.github.com/repos/huggingface/datasets/issues/8615/labels{/name} | value:8615 | json:{"login": "behroozazarkhalili", "id": 80390531, "node_id": "MDQ6VXNlcjgwMzkwNTMx", "avatar_url": "https://avatars.githubusercontent.com/u/80390531?v=4", "gravatar_id": "", "url": "https://api.github.com/users/behroozazarkhalili", "html_url": "https://github.com/behroozazarkhalili", "followers_url": "https://api.gi... | value:False | true | |||||||||||
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The Hub still redirects these names, so the first half of the load works: `hf_hub_download(repo_id="imdb", ...)` returns... | value:https://api.github.com/repos/huggingface/datasets/issues/8613/comments | value:PR_kwDODunzps8AAAABDQrb4A | value:open | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8613", "html_url": "https://github.com/huggingface/datasets/pull/8613", "diff_url": "https://github.com/huggingface/datasets/pull/8613.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8613.patch", "merged_at": null} | value:2026-09-20T00:07:55Z | value:https://api.github.com/repos/huggingface/datasets/issues/8613/labels{/name} | value:8613 | json:{"login": "ebarkhordar", "id": 22658149, "node_id": "MDQ6VXNlcjIyNjU4MTQ5", "avatar_url": "https://avatars.githubusercontent.com/u/22658149?v=4", "gravatar_id": "", "url": "https://api.github.com/users/ebarkhordar", "html_url": "https://github.com/ebarkhordar", "followers_url": "https://api.github.com/users/ebarkh... | value:False | true | |||||||||||
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```python
>>> from datasets import load_dataset
>>> load_dataset("imdb", split="train[:5]")
...
File "src/datasets/load.py", line 609, in get_module
standalone_yaml_path = cached_path(
File "src/datasets/utils/file_utils.py", ... | value:https://api.github.com/repos/huggingface/datasets/issues/8612/comments | value:I_kwDODunzps8AAAABQ-PqEQ | value:open | value:0 | value:2026-09-12T14:43:32Z | value:https://api.github.com/repos/huggingface/datasets/issues/8612/labels{/name} | value:8612 | json:{"login": "ebarkhordar", "id": 22658149, "node_id": "MDQ6VXNlcjIyNjU4MTQ5", "avatar_url": "https://avatars.githubusercontent.com/u/22658149?v=4", "gravatar_id": "", "url": "https://api.github.com/users/ebarkhordar", "html_url": "https://github.com/ebarkhordar", "followers_url": "https://api.github.com/users/ebarkh... | true | |||||||||||
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## Root cause
`Dataset.map(num_proc>1)` shards the table with Arrow slices (`table.slice`), and Arrow slices share their parent buffers. When a shard is pickled for a worker, `InMemoryTable.__getstate__` serializes the sliced arrays' full buffers, so every worker receives the whole table. A 2-pro... | value:https://api.github.com/repos/huggingface/datasets/issues/8611/comments | value:PR_kwDODunzps8AAAABDPtnPw | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8611", "html_url": "https://github.com/huggingface/datasets/pull/8611", "diff_url": "https://github.com/huggingface/datasets/pull/8611.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8611.patch", "merged_at": null} | value:2026-09-12T10:15:51Z | value:https://api.github.com/repos/huggingface/datasets/issues/8611/labels{/name} | value:8611 | json:{"login": "behroozazarkhalili", "id": 80390531, "node_id": "MDQ6VXNlcjgwMzkwNTMx", "avatar_url": "https://avatars.githubusercontent.com/u/80390531?v=4", "gravatar_id": "", "url": "https://api.github.com/users/behroozazarkhalili", "html_url": "https://github.com/behroozazarkhalili", "followers_url": "https://api.gi... | value:False | true | |||||||||||
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## Root cause
`dill` serializes a class it cannot import by its module path through `_create_type`, which rebuilds the class from `type(name, bases, dict)`. That path cannot rebuild an `Enum`: the members, `_value2member_map_`, aliases, Flag boundary and slot descriptors are produced by `EnumMeta... | value:https://api.github.com/repos/huggingface/datasets/issues/8610/comments | value:PR_kwDODunzps8AAAABDPdiuw | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8610", "html_url": "https://github.com/huggingface/datasets/pull/8610", "diff_url": "https://github.com/huggingface/datasets/pull/8610.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8610.patch", "merged_at": null} | value:2026-09-12T11:29:23Z | value:https://api.github.com/repos/huggingface/datasets/issues/8610/labels{/name} | value:8610 | json:{"login": "behroozazarkhalili", "id": 80390531, "node_id": "MDQ6VXNlcjgwMzkwNTMx", "avatar_url": "https://avatars.githubusercontent.com/u/80390531?v=4", "gravatar_id": "", "url": "https://api.github.com/users/behroozazarkhalili", "html_url": "https://github.com/behroozazarkhalili", "followers_url": "https://api.gi... | value:False | true | |||||||||||
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`_get_updated_dataset_card` updates the splits and sizes of the existing `dataset_info` when
a config is re-pushed, but never assigns the pushed `features` to it. Re-pushing a dataset's
only split with different columns therefore leaves the card declaring the previous schema
while the shards ho... | value:https://api.github.com/repos/huggingface/datasets/issues/8609/comments | value:PR_kwDODunzps8AAAABDOHJjA | value:closed | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8609", "html_url": "https://github.com/huggingface/datasets/pull/8609", "diff_url": "https://github.com/huggingface/datasets/pull/8609.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8609.patch", "merged_at": null} | value:2026-10-12T00:22:43Z | value:https://api.github.com/repos/huggingface/datasets/issues/8609/labels{/name} | value:8609 | json:{"login": "belambert", "id": 641648, "node_id": "MDQ6VXNlcjY0MTY0OA==", "avatar_url": "https://avatars.githubusercontent.com/u/641648?v=4", "gravatar_id": "", "url": "https://api.github.com/users/belambert", "html_url": "https://github.com/belambert", "followers_url": "https://api.github.com/users/belambert/follow... | value:False | true | |||||||||
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Re-pushing a dataset's only split with different columns updates the shards and the split
sizes in the README, but silently keeps the **old** `dataset_info.features`. The card then
declares a schema the parquet files no longer have, and the dataset viewer fails on the
first batch with `CastE... | value:https://api.github.com/repos/huggingface/datasets/issues/8608/comments | value:I_kwDODunzps8AAAABQ7A0Zg | value:closed | value:0 | value:2026-10-12T00:22:16Z | value:https://api.github.com/repos/huggingface/datasets/issues/8608/labels{/name} | value:8608 | json:{"login": "belambert", "id": 641648, "node_id": "MDQ6VXNlcjY0MTY0OA==", "avatar_url": "https://avatars.githubusercontent.com/u/641648?v=4", "gravatar_id": "", "url": "https://api.github.com/users/belambert", "html_url": "https://github.com/belambert", "followers_url": "https://api.github.com/users/belambert/follow... | true | ||||||||
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Implement `construct_from_string` on `PandasArrayExtensionDtype`: parse `array[<dtype>]` into a `PandasArrayExtensionDtype`, and raise `TypeError` for anything else (how pandas spells "not my dtype" in `__eq__`). Provenance: pandas extension-dtype docs, and the reproduction on `main` in #8467 (pandas ... | value:https://api.github.com/repos/huggingface/datasets/issues/8606/comments | value:PR_kwDODunzps8AAAABDM1XWg | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8606", "html_url": "https://github.com/huggingface/datasets/pull/8606", "diff_url": "https://github.com/huggingface/datasets/pull/8606.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8606.patch", "merged_at": null} | value:2026-10-14T12:32:03Z | value:https://api.github.com/repos/huggingface/datasets/issues/8606/labels{/name} | value:8606 | json:{"login": "cpruijsen", "id": 3891941, "node_id": "MDQ6VXNlcjM4OTE5NDE=", "avatar_url": "https://avatars.githubusercontent.com/u/3891941?v=4", "gravatar_id": "", "url": "https://api.github.com/users/cpruijsen", "html_url": "https://github.com/cpruijsen", "followers_url": "https://api.github.com/users/cpruijsen/foll... | value:False | true | |||||||||
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Restore the early return in `Pickler._batch_setitems` that honours `_legacy_no_dict_keys_sorting`, keeping the `*args` / `**kwargs` passthrough from `#7817`. `#7817` updated `Pickler._batch_setitems` for Python 3.14's extra argument and, in the same hunk, dropped that return. `_check_legacy_cache2` st... | value:https://api.github.com/repos/huggingface/datasets/issues/8605/comments | value:PR_kwDODunzps8AAAABDMiUHA | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8605", "html_url": "https://github.com/huggingface/datasets/pull/8605", "diff_url": "https://github.com/huggingface/datasets/pull/8605.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8605.patch", "merged_at": null} | value:2026-10-14T12:28:50Z | value:https://api.github.com/repos/huggingface/datasets/issues/8605/labels{/name} | value:8605 | json:{"login": "cpruijsen", "id": 3891941, "node_id": "MDQ6VXNlcjM4OTE5NDE=", "avatar_url": "https://avatars.githubusercontent.com/u/3891941?v=4", "gravatar_id": "", "url": "https://api.github.com/users/cpruijsen", "html_url": "https://github.com/cpruijsen", "followers_url": "https://api.github.com/users/cpruijsen/foll... | value:False | true | |||||||||
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## Root cause
The invalid Arrow data comes from pyarrow's JSON reader, not from `datasets`: when a list column's first non-empty value in a block starts with `null` (e.g. `{"a": [null, 1]}`), type inference can drop the leading null while the offsets still count it, so the table's list offsets sp... | value:https://api.github.com/repos/huggingface/datasets/issues/8604/comments | value:PR_kwDODunzps8AAAABDJc9Vg | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8604", "html_url": "https://github.com/huggingface/datasets/pull/8604", "diff_url": "https://github.com/huggingface/datasets/pull/8604.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8604.patch", "merged_at": null} | value:2026-09-11T16:44:22Z | value:https://api.github.com/repos/huggingface/datasets/issues/8604/labels{/name} | value:8604 | json:{"login": "behroozazarkhalili", "id": 80390531, "node_id": "MDQ6VXNlcjgwMzkwNTMx", "avatar_url": "https://avatars.githubusercontent.com/u/80390531?v=4", "gravatar_id": "", "url": "https://api.github.com/users/behroozazarkhalili", "html_url": "https://github.com/behroozazarkhalili", "followers_url": "https://api.gi... | value:False | true | |||||||||||
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This adds a `Tensor(shape, dtype)` feature for multi-dimensional arrays whose dimensions can vary from row to row, following the direction discussed in the issue: fixed ... | value:https://api.github.com/repos/huggingface/datasets/issues/8603/comments | value:PR_kwDODunzps8AAAABDIuH9g | value:open | value:5 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8603", "html_url": "https://github.com/huggingface/datasets/pull/8603", "diff_url": "https://github.com/huggingface/datasets/pull/8603.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8603.patch", "merged_at": null} | value:2026-11-09T18:21:27Z | value:https://api.github.com/repos/huggingface/datasets/issues/8603/labels{/name} | value:8603 | json:{"login": "behroozazarkhalili", "id": 80390531, "node_id": "MDQ6VXNlcjgwMzkwNTMx", "avatar_url": "https://avatars.githubusercontent.com/u/80390531?v=4", "gravatar_id": "", "url": "https://api.github.com/users/behroozazarkhalili", "html_url": "https://github.com/behroozazarkhalili", "followers_url": "https://api.gi... | value:False | true | |||||||||||
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`build_pr_documentation.yml` keys its concurrency group on `github.head_ref`, which is the head branch name without the fork owner. Two open PRs from different forks whose branches share a name therefore land in the same group, and a push on one cancels the in-flight doc build on the oth... | value:https://api.github.com/repos/huggingface/datasets/issues/8602/comments | value:PR_kwDODunzps8AAAABDHVkbA | value:open | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8602", "html_url": "https://github.com/huggingface/datasets/pull/8602", "diff_url": "https://github.com/huggingface/datasets/pull/8602.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8602.patch", "merged_at": null} | value:2026-09-11T08:28:28Z | value:https://api.github.com/repos/huggingface/datasets/issues/8602/labels{/name} | value:8602 | json:{"login": "albertvillanova", "id": 8515462, "node_id": "MDQ6VXNlcjg1MTU0NjI=", "avatar_url": "https://avatars.githubusercontent.com/u/8515462?v=4", "gravatar_id": "", "url": "https://api.github.com/users/albertvillanova", "html_url": "https://github.com/albertvillanova", "followers_url": "https://api.github.com/us... | value:False | true | |||||||||||
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`push_to_hub` replaced every shard of a split on each call, so growing a dataset meant re-uploading all of it. This adds `append=True` to `Dataset.push_to_hub` and `DatasetDict.push_to_hub`, following the approach discussed in the issue: download the last Parquet shard of the target split, copy i... | value:https://api.github.com/repos/huggingface/datasets/issues/8601/comments | value:PR_kwDODunzps8AAAABDFqhFw | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8601", "html_url": "https://github.com/huggingface/datasets/pull/8601", "diff_url": "https://github.com/huggingface/datasets/pull/8601.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8601.patch", "merged_at": null} | value:2026-11-09T19:14:33Z | value:https://api.github.com/repos/huggingface/datasets/issues/8601/labels{/name} | value:8601 | json:{"login": "behroozazarkhalili", "id": 80390531, "node_id": "MDQ6VXNlcjgwMzkwNTMx", "avatar_url": "https://avatars.githubusercontent.com/u/80390531?v=4", "gravatar_id": "", "url": "https://api.github.com/users/behroozazarkhalili", "html_url": "https://github.com/behroozazarkhalili", "followers_url": "https://api.gi... | value:False | true | |||||||||||
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`_apply_async` polled `future.ready()` in an `await asyncio.sleep(0)` loop. With the in-flight cap at `2 * num_threads`, that many hot loops keep the event loop thread holding the GIL, starving the ThreadPool threads it is waiting on — in stack dumps a pool worker took 45+ seconds to get through `ss... | value:https://api.github.com/repos/huggingface/datasets/issues/8597/comments | value:PR_kwDODunzps8AAAABDAVYWw | value:closed | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8597", "html_url": "https://github.com/huggingface/datasets/pull/8597", "diff_url": "https://github.com/huggingface/datasets/pull/8597.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8597.patch", "merged_at": null} | value:2026-10-15T22:32:03Z | value:https://api.github.com/repos/huggingface/datasets/issues/8597/labels{/name} | value:8597 | json:{"login": "HaukurPall", "id": 9451463, "node_id": "MDQ6VXNlcjk0NTE0NjM=", "avatar_url": "https://avatars.githubusercontent.com/u/9451463?v=4", "gravatar_id": "", "url": "https://api.github.com/users/HaukurPall", "html_url": "https://github.com/HaukurPall", "followers_url": "https://api.github.com/users/HaukurPall/... | value:False | true | |||||||||
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Loading a file whose parsed Arrow dtype already matches a declared `ClassLabel`'s storage type (`int64`) skips the range check entirely. Out-of-range indices load with no error and no warning, and only surface later at `int2str` time or as silently wrong labels during training.
```python
fr... | value:https://api.github.com/repos/huggingface/datasets/issues/8596/comments | value:I_kwDODunzps8AAAABQqietQ | value:open | value:2 | value:2026-09-16T08:05:39Z | value:https://api.github.com/repos/huggingface/datasets/issues/8596/labels{/name} | value:8596 | json:{"login": "caiotheodoro", "id": 48462974, "node_id": "MDQ6VXNlcjQ4NDYyOTc0", "avatar_url": "https://avatars.githubusercontent.com/u/48462974?v=4", "gravatar_id": "", "url": "https://api.github.com/users/caiotheodoro", "html_url": "https://github.com/caiotheodoro", "followers_url": "https://api.github.com/users/cai... | true | |||||||||||
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### Describe the bug
`decode(num_threads=N)` (added in #7450, "speeds up streaming up to 20 times") schedules the sync `decode_example` calls onto a `multiprocessing.pool.ThreadPool` and bridges them into the async map machinery with a busy-poll (`iterable_dataset.py`):
```python
async def _apply_async(pool, f... | value:https://api.github.com/repos/huggingface/datasets/issues/8595/comments | value:I_kwDODunzps8AAAABQqduuQ | value:closed | value:1 | value:2026-10-15T22:30:40Z | value:https://api.github.com/repos/huggingface/datasets/issues/8595/labels{/name} | value:8595 | json:{"login": "HaukurPall", "id": 9451463, "node_id": "MDQ6VXNlcjk0NTE0NjM=", "avatar_url": "https://avatars.githubusercontent.com/u/9451463?v=4", "gravatar_id": "", "url": "https://api.github.com/users/HaukurPall", "html_url": "https://github.com/HaukurPall", "followers_url": "https://api.github.com/users/HaukurPall/... | true | ||||||||
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`load_dataset(..., streaming=True)` without a split returns an `IterableDatasetDict`, and shuffling it cannot reach the shard-interleaving control:
```python
ds = load_dataset("HuggingFaceFW/fineweb", streaming=True)
ds = ds.shuffle(seed=42, buffer_size=10_000, max_buffer_input_shards=4)
# TypeEr... | value:https://api.github.com/repos/huggingface/datasets/issues/8594/comments | value:PR_kwDODunzps8AAAABC3z2_A | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8594", "html_url": "https://github.com/huggingface/datasets/pull/8594", "diff_url": "https://github.com/huggingface/datasets/pull/8594.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8594.patch", "merged_at": "2026-09-10T13:32:20Z"} | value:2026-09-10T13:32:20Z | value:https://api.github.com/repos/huggingface/datasets/issues/8594/labels{/name} | value:8594 | json:{"login": "vineethsaivs", "id": 42468190, "node_id": "MDQ6VXNlcjQyNDY4MTkw", "avatar_url": "https://avatars.githubusercontent.com/u/42468190?v=4", "gravatar_id": "", "url": "https://api.github.com/users/vineethsaivs", "html_url": "https://github.com/vineethsaivs", "followers_url": "https://api.github.com/users/vin... | value:False | true | |||||||||
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When `Dataset.map()` recombines multiple shards, it drops the source split. It also loses metadata such as `config_name` when the shards infer different compatible features (for example, a new column is null throughout the first shard and integer-valued in the second).
Pass a copy of the source inf... | value:https://api.github.com/repos/huggingface/datasets/issues/8593/comments | value:PR_kwDODunzps8AAAABC28WLA | value:closed | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8593", "html_url": "https://github.com/huggingface/datasets/pull/8593", "diff_url": "https://github.com/huggingface/datasets/pull/8593.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8593.patch", "merged_at": null} | value:2026-10-09T14:08:33Z | value:https://api.github.com/repos/huggingface/datasets/issues/8593/labels{/name} | value:8593 | json:{"login": "Con-Benksl", "id": 255908631, "node_id": "U_kgDOD0DbFw", "avatar_url": "https://avatars.githubusercontent.com/u/255908631?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Con-Benksl", "html_url": "https://github.com/Con-Benksl", "followers_url": "https://api.github.com/users/Con-Benksl/foll... | value:False | true | |||||||||
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**Problem**: `List` is invariant while `Sequence` is covariant, so passing a `List[str]` to a function expecting `Union[PathLike, List[PathLike]]` fails ty... | value:https://api.github.com/repos/huggingface/datasets/issues/8592/comments | value:PR_kwDODunzps8AAAABC1mmJA | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8592", "html_url": "https://github.com/huggingface/datasets/pull/8592", "diff_url": "https://github.com/huggingface/datasets/pull/8592.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8592.patch", "merged_at": null} | value:2026-09-22T09:56:43Z | value:https://api.github.com/repos/huggingface/datasets/issues/8592/labels{/name} | value:8592 | json:{"login": "CJstate", "id": 142857225, "node_id": "U_kgDOCIPUCQ", "avatar_url": "https://avatars.githubusercontent.com/u/142857225?v=4", "gravatar_id": "", "url": "https://api.github.com/users/CJstate", "html_url": "https://github.com/CJstate", "followers_url": "https://api.github.com/users/CJstate/followers", "fol... | value:False | true | |||||||||
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So this does not change what the writer accepts. Before the cast, `ArrowWriter... | value:https://api.github.com/repos/huggingface/datasets/issues/8591/comments | value:PR_kwDODunzps8AAAABCwjC6Q | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8591", "html_url": "https://github.com/huggingface/datasets/pull/8591", "diff_url": "https://github.com/huggingface/datasets/pull/8591.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8591.patch", "merged_at": "2026-09-10T13:33:37Z"} | value:2026-09-12T12:07:00Z | value:https://api.github.com/repos/huggingface/datasets/issues/8591/labels{/name} | value:8591 | json:{"login": "ebarkhordar", "id": 22658149, "node_id": "MDQ6VXNlcjIyNjU4MTQ5", "avatar_url": "https://avatars.githubusercontent.com/u/22658149?v=4", "gravatar_id": "", "url": "https://api.github.com/users/ebarkhordar", "html_url": "https://github.com/ebarkhordar", "followers_url": "https://api.github.com/users/ebarkh... | value:False | true | |||||||||
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Between 4.8.4 and 4.8.5, checksum recording flipped from on to off by default in two places. From the sdists:
```
4.8.4 src/datasets/download/download_manager.py:80 record_checksums=True
4.8.5 src/datasets/download/download_manager.py:80 record_checksums=False
4.8.4 src/datasets/utils/i... | value:https://api.github.com/repos/huggingface/datasets/issues/8590/comments | value:I_kwDODunzps8AAAABQVWRlw | value:open | value:4 | value:2026-10-17T16:04:11Z | value:https://api.github.com/repos/huggingface/datasets/issues/8590/labels{/name} | value:8590 | json:{"login": "arian-gogani", "id": 264840462, "node_id": "U_kgDOD8klDg", "avatar_url": "https://avatars.githubusercontent.com/u/264840462?v=4", "gravatar_id": "", "url": "https://api.github.com/users/arian-gogani", "html_url": "https://github.com/arian-gogani", "followers_url": "https://api.github.com/users/arian-gog... | true | ||||||||||
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When a `np.random.Generator` is passed to `Dataset.shuffle`, the indices cache lookup returns before `generator.permutation(...)` is called, so the caller's generator never advances on a cache hit. Because the fingerprint is derived from the generator's state, the next call recomputes the same fin... | value:https://api.github.com/repos/huggingface/datasets/issues/8589/comments | value:PR_kwDODunzps8AAAABCuN8Og | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8589", "html_url": "https://github.com/huggingface/datasets/pull/8589", "diff_url": "https://github.com/huggingface/datasets/pull/8589.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8589.patch", "merged_at": "2026-09-10T13:34:23Z"} | value:2026-09-10T13:34:24Z | value:https://api.github.com/repos/huggingface/datasets/issues/8589/labels{/name} | value:8589 | json:{"login": "BenYang12", "id": 93775148, "node_id": "U_kgDOBZblLA", "avatar_url": "https://avatars.githubusercontent.com/u/93775148?v=4", "gravatar_id": "", "url": "https://api.github.com/users/BenYang12", "html_url": "https://github.com/BenYang12", "followers_url": "https://api.github.com/users/BenYang12/followers"... | value:False | true | |||||||||
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`TranslationVariableLanguages` declares `languages` as optional, but building one without it makes every example fail to encode.
```python
>>> from datasets import Dataset, Features
>>> from datasets.features.translation import TranslationVariableLanguages
>>> TranslationVariableLanguages().en... | value:https://api.github.com/repos/huggingface/datasets/issues/8588/comments | value:PR_kwDODunzps8AAAABCtEBug | value:open | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8588", "html_url": "https://github.com/huggingface/datasets/pull/8588", "diff_url": "https://github.com/huggingface/datasets/pull/8588.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8588.patch", "merged_at": null} | value:2026-10-22T18:18:08Z | value:https://api.github.com/repos/huggingface/datasets/issues/8588/labels{/name} | value:8588 | json:{"login": "vineethsaivs", "id": 42468190, "node_id": "MDQ6VXNlcjQyNDY4MTkw", "avatar_url": "https://avatars.githubusercontent.com/u/42468190?v=4", "gravatar_id": "", "url": "https://api.github.com/users/vineethsaivs", "html_url": "https://github.com/vineethsaivs", "followers_url": "https://api.github.com/users/vin... | value:False | true | |||||||||||
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I've fixed `flatten()` losing a selected struct's formatted columns. Its old name stays in the selection after flattening, so indexing can return an empty batch instead of the selected values.
The fix flattens the selected features alongside the schema. It keeps unselected descendants exclu... | value:https://api.github.com/repos/huggingface/datasets/issues/8587/comments | value:PR_kwDODunzps8AAAABCoaFTQ | value:open | value:2 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8587", "html_url": "https://github.com/huggingface/datasets/pull/8587", "diff_url": "https://github.com/huggingface/datasets/pull/8587.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8587.patch", "merged_at": null} | value:2026-10-06T16:23:42Z | value:https://api.github.com/repos/huggingface/datasets/issues/8587/labels{/name} | value:8587 | json:{"login": "mottopanikeiku", "id": 176798723, "node_id": "U_kgDOCom8Aw", "avatar_url": "https://avatars.githubusercontent.com/u/176798723?v=4", "gravatar_id": "", "url": "https://api.github.com/users/mottopanikeiku", "html_url": "https://github.com/mottopanikeiku", "followers_url": "https://api.github.com/users/mot... | value:False | true | |||||||||||
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`metadata_filenames` is only ever used as a membership test:
```python
metadata_filenames = self.config.metadata_filenames or self.METADATA_FILENAMES
...
elif os.path.basename(original_file) in metadata_filenames:
```
If it is a bare string rather than a list, `in` becomes a **substring** test:
``... | value:https://api.github.com/repos/huggingface/datasets/issues/8586/comments | value:PR_kwDODunzps8AAAABCoEyUw | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8586", "html_url": "https://github.com/huggingface/datasets/pull/8586", "diff_url": "https://github.com/huggingface/datasets/pull/8586.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8586.patch", "merged_at": null} | value:2026-09-08T06:42:35Z | value:https://api.github.com/repos/huggingface/datasets/issues/8586/labels{/name} | value:8586 | json:{"login": "LeSingh1", "id": 197028264, "node_id": "U_kgDOC75pqA", "avatar_url": "https://avatars.githubusercontent.com/u/197028264?v=4", "gravatar_id": "", "url": "https://api.github.com/users/LeSingh1", "html_url": "https://github.com/LeSingh1", "followers_url": "https://api.github.com/users/LeSingh1/followers", ... | value:False | true | |||||||||||
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`GeneratorConfig` checks that `generator` is not `None`, but not that it is callable. A wrong type is only discovered during generation:
```python
Dataset.from_generator([{"a": 1}])
```
```
DatasetGenerationError: An error occurred while generating the dataset
caused by
TypeError: 'list' object i... | value:https://api.github.com/repos/huggingface/datasets/issues/8585/comments | value:PR_kwDODunzps8AAAABCoC6tA | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8585", "html_url": "https://github.com/huggingface/datasets/pull/8585", "diff_url": "https://github.com/huggingface/datasets/pull/8585.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8585.patch", "merged_at": "2026-09-10T13:39:28Z"} | value:2026-09-10T13:39:28Z | value:https://api.github.com/repos/huggingface/datasets/issues/8585/labels{/name} | value:8585 | json:{"login": "LeSingh1", "id": 197028264, "node_id": "U_kgDOC75pqA", "avatar_url": "https://avatars.githubusercontent.com/u/197028264?v=4", "gravatar_id": "", "url": "https://api.github.com/users/LeSingh1", "html_url": "https://github.com/LeSingh1", "followers_url": "https://api.github.com/users/LeSingh1/followers", ... | value:False | true | |||||||||
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`load_dataset("xml", ...)` fails for **every** input:
```python
open("a.xml", "w").write("<root><a>1</a></root>")
load_dataset("xml", data_files="a.xml", split="train")
```
```
DatasetGenerationError: An error occurred while generating the dataset
caused by
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