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https://api.github.com/repos/huggingface/datasets/issues/8739 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8739/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8739/comments | https://api.github.com/repos/huggingface/datasets/issues/8739/events | https://github.com/huggingface/datasets/pull/8739 | 5,713,455,988 | PR_kwDODunzps8AAAABGuRv5Q | 8,739 | harbor: fix paths on windows | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8739). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-10-05T14:06:09 | 2026-10-05T14:23:28 | 2026-10-05T14:23:26 | null | MEMBER | [] | null | null | 0 | {
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```
UnicodeDecodeError: 'utf-16-le' codec can't... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8737 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8737/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8737/comments | https://api.github.com/repos/huggingface/datasets/issues/8737/events | https://github.com/huggingface/datasets/pull/8737 | 5,695,912,955 | PR_kwDODunzps8AAAABGgbeBw | 8,737 | Decode remote NIfTI files through the bytes path | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8737). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-10-04T03:34:26 | 2026-10-05T13:13:14 | 2026-10-05T13:13:13 | null | CONTRIBUTOR | [] | null | null | 0 | {
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Read remote content into the existing bytes decoder so plain and gzipped files use the same handling as embedded ... | {
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https://api.github.com/repos/huggingface/datasets/issues/8736 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8736/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8736/comments | https://api.github.com/repos/huggingface/datasets/issues/8736/events | https://github.com/huggingface/datasets/pull/8736 | 5,695,893,410 | PR_kwDODunzps8AAAABGgahiQ | 8,736 | Preserve embedded bytes and excluded paths in bio features | {
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"maybe let's reuse the same logic as other features, like `image.py` for example ?"
] | 2026-10-04T03:30:34 | 2026-10-05T13:12:33 | null | null | CONTRIBUTOR | [] | null | null | 0 | {
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} | `BioSequence` and `BioStructure` reopen the source path even when a row already contains bytes. This makes `save_to_disk()` fail after the source file is moved, and can overwrite embedded content if the source has changed. Path-only rows also lose their directory or URL when file embedding is disabled.
Only read sel... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8735 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8735/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8735/comments | https://api.github.com/repos/huggingface/datasets/issues/8735/events | https://github.com/huggingface/datasets/pull/8735 | 5,695,889,400 | PR_kwDODunzps8AAAABGgaVhg | 8,735 | Fix feature parsing when YAML keys are reordered | {
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} | Sorting the keys in a dataset card's YAML puts `length` before `list`. The feature parser treats the first key as the feature type, so an otherwise unchanged fixed-length list fails to load with `TypeError: 'int' object is not a mapping`.
Select the feature type key explicitly, keeping the existing fallback for othe... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8734 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8734/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8734/comments | https://api.github.com/repos/huggingface/datasets/issues/8734/events | https://github.com/huggingface/datasets/pull/8734 | 5,695,867,080 | PR_kwDODunzps8AAAABGgZTYw | 8,734 | Preserve -1 missing labels in align_labels_with_mapping | {
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} | `ClassLabel` supports `-1` for unknown or missing labels, but `align_labels_with_mapping()` tries to convert it to a label name and raises `ValueError: Invalid integer class label -1`. A partially labeled dataset therefore cannot align its labels with a model's mapping without first dropping or rewriting those rows.
T... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8733 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8733/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8733/comments | https://api.github.com/repos/huggingface/datasets/issues/8733/events | https://github.com/huggingface/datasets/pull/8733 | 5,695,660,852 | PR_kwDODunzps8AAAABGgPSuQ | 8,733 | Preserve lazy resolution when adding data-file pattern lists | {
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} | Adding two `DataFilesPatternsList` instances currently returns a `DataFilesList`. This removes lazy `.resolve()` support and stores the extension restrictions as origin metadata. Passing the combined wildcard patterns to `load_dataset("text", ...)` consequently raises `FileNotFoundError` for the unexpanded pattern.
Re... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8732 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8732/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8732/comments | https://api.github.com/repos/huggingface/datasets/issues/8732/events | https://github.com/huggingface/datasets/pull/8732 | 5,691,825,090 | PR_kwDODunzps8AAAABGdRVrA | 8,732 | Fix broken documentation links | {
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} | ## What
Fixes three documentation links that no longer land on the page they name.
- `docs/source/upload_dataset.mdx`: `huggingface.co/datasets/cnn_dailymail` returns 404. The dataset card guide already uses `abisee/cnn_dailymail`, which returns 200.
- `docs/source/use_with_numpy.mdx`: `huggingface.co/datasets/mnist` ... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8731 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8731/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8731/comments | https://api.github.com/repos/huggingface/datasets/issues/8731/events | https://github.com/huggingface/datasets/pull/8731 | 5,684,498,722 | PR_kwDODunzps8AAAABGXnhsg | 8,731 | Fix audio array handling in preprocess_function | {
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https://api.github.com/repos/huggingface/datasets/issues/8730 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8730/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8730/comments | https://api.github.com/repos/huggingface/datasets/issues/8730/events | https://github.com/huggingface/datasets/pull/8730 | 5,680,780,747 | PR_kwDODunzps8AAAABGUofug | 8,730 | Fix compression in Dataset.to_csv | {
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} | ## Summary
Fixes https://github.com/huggingface/datasets/issues/6043.
`Dataset.to_csv()` currently renders each batch with `pandas.DataFrame.to_csv(path_or_buf=None)`, which returns CSV text and ignores compression. This change applies compression to the output handle once, then writes all serial or multiprocessing-p... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8729 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8729/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8729/comments | https://api.github.com/repos/huggingface/datasets/issues/8729/events | https://github.com/huggingface/datasets/pull/8729 | 5,677,884,912 | PR_kwDODunzps8AAAABGSU51A | 8,729 | Add harbor benchmarks | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8729). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
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https://api.github.com/repos/huggingface/datasets/issues/8728 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8728/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8728/comments | https://api.github.com/repos/huggingface/datasets/issues/8728/events | https://github.com/huggingface/datasets/pull/8728 | 5,676,373,533 | PR_kwDODunzps8AAAABGRHzfg | 8,728 | Fix docstrings that name parameters the functions do not have | {
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} | Four `Args:` blocks document an argument that is not in the signature, so the documented name renders as a parameter that does not exist while the real one gets no entry.
| file | function | documented | actual |
|---|---|---|---|
| `arrow_dataset.py` | `Dataset.train_test_split` | `train_cache_file_name`, `test_cache... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8727 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8727/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8727/comments | https://api.github.com/repos/huggingface/datasets/issues/8727/events | https://github.com/huggingface/datasets/pull/8727 | 5,674,882,929 | PR_kwDODunzps8AAAABGP74uQ | 8,727 | Fix repeated Arrow rebatch checkpoint restoration | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8727). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
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Count source chunks relative to the replay position and save the exhausted sourc... | {
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https://api.github.com/repos/huggingface/datasets/issues/8726 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8726/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8726/comments | https://api.github.com/repos/huggingface/datasets/issues/8726/events | https://github.com/huggingface/datasets/pull/8726 | 5,672,626,564 | PR_kwDODunzps8AAAABGOK4zA | 8,726 | Honor Video stream_index for remote paths | {
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} | Users selecting video stream 1 from a nonlocal path received stream 0 instead. In a two-stream file, this returned a red frame where the requested stream contained a blue frame.
`Video.decode_example` passed `stream_index` to the decoder for local paths and bytes, but omitted it when calling `hf_video_reader` for nonl... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8725 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8725/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8725/comments | https://api.github.com/repos/huggingface/datasets/issues/8725/events | https://github.com/huggingface/datasets/pull/8725 | 5,670,923,576 | PR_kwDODunzps8AAAABGM18ig | 8,725 | Fix IterableDataset.filter with arrow, pandas and polars formats | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8725). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
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"merged_at": "2026-10-05T13:57... | Fixes #8724.
`IterableDataset.filter` raised for every table format (`arrow`, `pandas`, `polars`), although the integration guides say it works the same way as `IterableDataset.map`.
Changes:
- `IterableDataset.filter` now builds its iterable the same way `IterableDataset.map` does for table formats: format first, th... | {
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https://api.github.com/repos/huggingface/datasets/issues/8724 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8724/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8724/comments | https://api.github.com/repos/huggingface/datasets/issues/8724/events | https://github.com/huggingface/datasets/issues/8724 | 5,670,920,741 | I_kwDODunzps8AAAABUgNiJQ | 8,724 | IterableDataset.filter fails with arrow, pandas and polars formats | {
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`IterableDataset.filter` fails for every table format (`arrow`, `pandas`, `polars`), even though the "Use with Pandas / PyArrow / Polars" guides say it "also works for `IterableDataset.map` and `IterableDataset.filter`". `map` works in the same setup.
### Steps to reproduce the bug
```python
imp... | {
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https://api.github.com/repos/huggingface/datasets/issues/8723 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8723/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8723/comments | https://api.github.com/repos/huggingface/datasets/issues/8723/events | https://github.com/huggingface/datasets/pull/8723 | 5,670,657,139 | PR_kwDODunzps8AAAABGModfg | 8,723 | Fix concatenate_datasets(axis=1) on arrow-backed iterable datasets with different lengths | {
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"concatenate_datasets() already fails on non-iterable datasets if they don't have the same length, so I feel like filling the missing values with null would not be coherent with the non-iterable case"
] | 2026-10-01T23:35:01 | 2026-10-05T13:26:27 | null | null | CONTRIBUTOR | [] | null | null | 0 | {
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} | Fixes #8719.
`HorizontallyConcatenatedMultiSourcesExamplesIterable._iter_arrow` appended each source's columns to the first table without checking lengths. All sources are rebatched to the same batch size, so the only mismatch is the round where the shorter source yields its last partial batch, and `append_column` rai... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8722 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8722/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8722/comments | https://api.github.com/repos/huggingface/datasets/issues/8722/events | https://github.com/huggingface/datasets/pull/8722 | 5,670,070,369 | PR_kwDODunzps8AAAABGMKiVw | 8,722 | Fix iflatmap_unordered with empty worker results | {
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} | ## Problem
`iflatmap_unordered` raises `UnboundLocalError` if any worker returns an empty iterable. `_write_generator_to_queue` returns `i` after its loop, but `i` is never assigned when there are no items. The exception is then propagated by `async_result.get()`, including for mixed empty/non-empty jobs.
## Change
... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8721 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8721/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8721/comments | https://api.github.com/repos/huggingface/datasets/issues/8721/events | https://github.com/huggingface/datasets/pull/8721 | 5,669,336,115 | PR_kwDODunzps8AAAABGLklmw | 8,721 | Load directories written by Dataset.save_to_disk in load_dataset | {
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"@lhoestq following up on your suggestion on #7653 to do this in `packaged_modules.arrow`: I tried it, and the builder cannot tell a file the user named from one that a directory listing found. That version silently dropped a `map` cache file passed explicitly through `data_files`, computed the cache fingerprint fr... | 2026-10-01T21:20:06 | 2026-10-02T12:33:37 | null | null | CONTRIBUTOR | [] | null | null | 0 | {
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} | Addresses the first of the two remaining items in #5044, as listed in [this comment](https://github.com/huggingface/datasets/issues/5044#issuecomment-2790265378): `load_dataset()` supports the `save_to_disk()` structure, with a warning that it is there for compatibility. It reads the saved Arrow files through the Arrow... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8720 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8720/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8720/comments | https://api.github.com/repos/huggingface/datasets/issues/8720/events | https://github.com/huggingface/datasets/pull/8720 | 5,668,928,046 | PR_kwDODunzps8AAAABGLPeIQ | 8,720 | Add DatasetBuilder.as_iterable_dataset to stream the Arrow cache | {
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} | Resolves #5481. Builds on #7628 by @ArjunJagdale, whose commit is the first one here; thank you for the starting point.
`DatasetBuilder.as_iterable_dataset(split=None)` returns an `IterableDataset` that reads the Arrow files `download_and_prepare()` already wrote to the cache, without loading them into memory. This is... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8719 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8719/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8719/comments | https://api.github.com/repos/huggingface/datasets/issues/8719/events | https://github.com/huggingface/datasets/issues/8719 | 5,664,579,428 | I_kwDODunzps8AAAABUaKfZA | 8,719 | concatenate_datasets(axis=1) crashes on arrow-backed IterableDatasets with different lengths | {
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Horizontally concatenating two arrow-backed `IterableDataset`s (for example from `Dataset.to_iterable_dataset()` or a streamed Parquet/Arrow dataset) raises `pyarrow.lib.ArrowInvalid` when the sources have different numbers of rows. The error happens as soon as the result is iterated, through `lis... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8718 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8718/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8718/comments | https://api.github.com/repos/huggingface/datasets/issues/8718/events | https://github.com/huggingface/datasets/pull/8718 | 5,660,310,273 | PR_kwDODunzps8AAAABGERXxg | 8,718 | Don't serve the cached dataset module when download_mode is force_redownload | {
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} | `load_dataset(..., download_mode="force_redownload")` still returns the cached copy of a dataset that's been removed from the Hub instead of raising, as #3105 says. Reproduces on main.
`dataset_module_factory` catches every Hub resolution failure in one handler and tries the module cache before re-raising, and `downlo... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8717 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8717/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8717/comments | https://api.github.com/repos/huggingface/datasets/issues/8717/events | https://github.com/huggingface/datasets/pull/8717 | 5,659,729,501 | PR_kwDODunzps8AAAABGDzk7w | 8,717 | docs: add "Use with Hugging Face Jobs" guide | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8717). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.",
"> Jobs plans to set PYTHON_CPU_COUNT / OMP_NUM_THREADS from CPU_CORES, which may simpli... | 2026-10-01T09:05:51 | 2026-10-02T11:06:58 | null | null | MEMBER | [] | null | null | 0 | {
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} | Adds a guide for processing datasets on [Hugging Face Jobs](https://huggingface.co/docs/hub/jobs), under General usage next to "Use with Spark". 🤗 Datasets works the same in a Job; the guide covers the patterns that are specific to datasets:
- `map(num_proc=…)` on a bigger CPU machine (using `CPU_CORES`, since `os.cp... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8716 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8716/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8716/comments | https://api.github.com/repos/huggingface/datasets/issues/8716/events | https://github.com/huggingface/datasets/pull/8716 | 5,656,641,491 | PR_kwDODunzps8AAAABGBWxtw | 8,716 | Allow IterableDataset.push_to_hub num_shards above dataset.num_shards | {
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"Could we achieve this without having to count all the examples ? Not a big fan of the slow down it would cause\r\n\r\nMaybe we can just have each single input shard be piped to multiple output shards in a round robin fashion ?\r\n\r\ne.g if a dataset of 10 shards should output 20 shards then for each input shard w... | 2026-10-01T03:50:02 | 2026-10-05T13:56:32 | 2026-10-05T13:56:32 | null | CONTRIBUTOR | [] | null | null | 0 | {
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"merged_at": "2026-10-05T13:56... | Resolves #7047, following @lhoestq's note there that `IterableDataset.push_to_hub` only accepts `num_shards <= dataset.num_shards`.
Before this change, asking for more output shards than the dataset has failed with `IndexError: list index out of range`, because the work was split by source shard.
When more shards are... | {
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https://api.github.com/repos/huggingface/datasets/issues/8715 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8715/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8715/comments | https://api.github.com/repos/huggingface/datasets/issues/8715/events | https://github.com/huggingface/datasets/pull/8715 | 5,647,881,786 | PR_kwDODunzps8AAAABF6U24Q | 8,715 | Fix Json casts of mixed encoded and plain strings | {
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} | `Json.cast_storage` samples five strings and makes one encoding decision for the entire array. Mixed JSON text and plain strings therefore either double-encode valid JSON or leave later plain strings invalid, depending on row order and casting batch size.
Use the existing `Json.encode_example` rule for each `pa.Stri... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8714 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8714/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8714/comments | https://api.github.com/repos/huggingface/datasets/issues/8714/events | https://github.com/huggingface/datasets/issues/8714 | 5,647,821,325 | I_kwDODunzps8AAAABUKLqDQ | 8,714 | Casting mixed JSON and plain strings to Json depends on row order and batch size | {
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"#self-assign\n\nI have reproduced this on current main and prepared a focused fix using the existing per-value encoding rule, with regression tests for both row orders and multiple batch sizes."
] | 2026-09-30T14:11:42 | 2026-09-30T14:12:11 | null | null | NONE | [] | null | null | null | null | ### Describe the bug
Casting a string column containing both JSON-encoded values and plain strings to `Json()` gives different results depending on row order and `batch_size`. A plain string among the first five rows makes valid JSON values decode as strings; a plain string after those rows is left unencoded and raise... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8713 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8713/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8713/comments | https://api.github.com/repos/huggingface/datasets/issues/8713/events | https://github.com/huggingface/datasets/issues/8713 | 5,645,210,412 | I_kwDODunzps8AAAABUHsTLA | 8,713 | JSON loader turns strings like "123" or "null" into other types in inferred Json columns | {
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For example rows `{"a": {"b": 1}}`, `{"a": "123"}`, `{"a": "null"}`, `{"a": "true"}`, `{"a": "hello"}` load back as `{'b': 1}, 123, None, Tr... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8712 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8712/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8712/comments | https://api.github.com/repos/huggingface/datasets/issues/8712/events | https://github.com/huggingface/datasets/pull/8712 | 5,639,261,481 | PR_kwDODunzps8AAAABFzanzA | 8,712 | Keep Json fields inside a struct from being double-encoded when some struct rows are null | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8712). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-09-30T01:08:15 | 2026-10-05T12:45:13 | 2026-10-05T12:45:13 | null | CONTRIBUTOR | [] | null | null | 0 | {
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"merged_at": "2026-10-05T12:45... | A `Json()` field inside a struct is double-encoded for every row when any struct row in the batch is null. Reads then return the raw JSON text instead of the decoded object:
```python
from datasets import Dataset, Features, Json, Value
features = Features({"s": {"x": Json(), "y": Value("int64")}})
ds = Dataset.from_d... | {
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https://api.github.com/repos/huggingface/datasets/issues/8711 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8711/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8711/comments | https://api.github.com/repos/huggingface/datasets/issues/8711/events | https://github.com/huggingface/datasets/pull/8711 | 5,639,217,997 | PR_kwDODunzps8AAAABFzYf3A | 8,711 | Advance the user-supplied generator in Dataset.train_test_split even on cache hits | {
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} | `Dataset.train_test_split(generator=g)` has the same cache-hit problem that #8589 fixed for `Dataset.shuffle`. The #8589 description mentions it as a follow-up.
When a dataset has cache files and the split indices are already cached, `train_test_split` returns before it calls `generator.permutation(...)` (or the strat... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8710 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8710/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8710/comments | https://api.github.com/repos/huggingface/datasets/issues/8710/events | https://github.com/huggingface/datasets/pull/8710 | 5,627,489,595 | PR_kwDODunzps8AAAABFp_x3w | 8,710 | Fix string_to_dict with unrelated regex capture groups | {
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"Sorry, this was closed by mistake, reopening."
] | 2026-09-29T08:22:10 | 2026-10-04T09:03:49 | null | null | NONE | [] | null | null | 0 | {
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} | Fixes #8709.
`string_to_dict` zipped every regex capture group to the format field names, so a pattern whose own groups came first (for example `(train|test)/{name}`) mapped the field to the wrong group - `name` got `"train"` instead of the real value. Read each field from its named group (`result.group(f"_{key}")`)... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8709 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8709/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8709/comments | https://api.github.com/repos/huggingface/datasets/issues/8709/events | https://github.com/huggingface/datasets/issues/8709 | 5,627,431,520 | I_kwDODunzps8AAAABT2vKYA | 8,709 | string_to_dict maps fields to unrelated regex capture groups | {
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"#self-assign"
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`string_to_dict` creates named groups for format fields, but builds the result by zipping field names with every regex capture. An unrelated capturing group shifts the values.
## Reproduction
```python
from datasets.utils.py_utils import string_to_dict
print(string_to_dict("train/alice", "(train|test)/{na... | null | {
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} | Anyone who passes `probabilities` with a 0 weight together with `stopping_strategy="all_exhausted_without_replacement"` to `interleave_datasets` on map-style datasets gets a call that never returns: the source with probability 0 is never drawn, so it is never marked exhausted and the sampling loop keeps drawing forever... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8707 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8707/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8707/comments | https://api.github.com/repos/huggingface/datasets/issues/8707/events | https://github.com/huggingface/datasets/pull/8707 | 5,621,204,667 | PR_kwDODunzps8AAAABFk-vwA | 8,707 | Fix epoch iteration after skipping or taking a streaming subset | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8707). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-09-28T21:03:44 | 2026-10-05T13:55:55 | 2026-10-05T13:55:54 | null | NONE | [] | null | null | 0 | {
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"merged_at": "2026-10-05T13:55... | Fixes #8706.
After `skip()` or `take()`, iterating an `IterableDataset` at a nonzero epoch currently raises `DataSourcesShufflingDisallowed`. Preserve the frozen shard order during epoch preparation, while still updating shuffle-buffer RNGs.
Shift RNGs on shallow copies of the iterable wrappers so the stored pipeline... | {
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https://api.github.com/repos/huggingface/datasets/issues/8706 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8706/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8706/comments | https://api.github.com/repos/huggingface/datasets/issues/8706/events | https://github.com/huggingface/datasets/issues/8706 | 5,621,186,429 | I_kwDODunzps8AAAABTwx_fQ | 8,706 | IterableDataset skip/take fails when iterating a nonzero epoch | {
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After `IterableDataset.skip()` or `take()`, iteration works at epoch 0 but raises `DataSourcesShufflingDisallowed` after `set_epoch(1)`. This also affects a frozen subset with a shuffle buffer, so a multi-epoch data-loading loop stops when it starts its second epoch.
Reproduced with Datasets 5.0.... | {
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https://api.github.com/repos/huggingface/datasets/issues/8705 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8705/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8705/comments | https://api.github.com/repos/huggingface/datasets/issues/8705/events | https://github.com/huggingface/datasets/issues/8705 | 5,608,735,312 | I_kwDODunzps8AAAABTk6CUA | 8,705 | Skip constructing disabled `hf_tqdm` progress bars in `map_nested` and `_single_map_nested` | {
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`map_nested()` in `src/datasets/utils/py_utils.py` is called for every example by the tensor formatters (such as `TorchFormatter.recursive_tensorize()`) with `disable_tqdm=True` (the default). However, `map_nested()` unconditionally wraps its input iterable in `hf_tqdm(iterable, disable=disabl... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8704 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8704/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8704/comments | https://api.github.com/repos/huggingface/datasets/issues/8704/events | https://github.com/huggingface/datasets/issues/8704 | 5,608,713,007 | I_kwDODunzps8AAAABTk4rLw | 8,704 | Avoid repeated `np.lib.NumpyVersion(np.__version__)` parsing per column/row in `NumpyArrowExtractor._arrow_array_to_numpy` | {
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In `src/datasets/formatting/formatting.py`, `NumpyArrowExtractor._arrow_array_to_numpy()` checks the installed NumPy version on every call by evaluating:
```python
if np.lib.NumpyVersion(np.__version__) >= "2.0.0b1":
```
When iterating a formatted `IterableDataset` (e.g., `.with_format("torc... | null | {
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} | Fixes #8702.
On Windows, the builder lock flattens the entire absolute cache dir into the lock *filename*, roughly doubling the total path — so `load_dataset()` dies with `[WinError 206] The filename or extension is too long` at cache dirs of ~85+ chars (a OneDrive Documents folder is enough), long before anything els... | null | {
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