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https://api.github.com/repos/huggingface/datasets/issues/8598 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8598/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8598/comments | https://api.github.com/repos/huggingface/datasets/issues/8598/events | https://github.com/huggingface/datasets/pull/8598 | 5,413,916,263 | PR_kwDODunzps8AAAABDAzNEQ | 8,598 | [httpx migration] Import httpx from huggingface_hub | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8598). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.",
"Failing CI seems unrelated \r\n\r\n```\r\nFAILED tests/test_hub.py::test_delete_from_hu... | 2026-09-10T15:07:51 | 2026-09-10T16:08:38 | null | null | CONTRIBUTOR | [] | null | null | false | {
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} | Direct httpx imports will break when huggingface_hub migrates to httpx2. This updates them to use the compatibility re-export introduced in https://github.com/huggingface/huggingface_hub/pull/4803, following the migration plan in https://github.com/huggingface/huggingface_hub/issues/4802. Goal is to make datasets compa... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8597 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8597/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8597/comments | https://api.github.com/repos/huggingface/datasets/issues/8597/events | https://github.com/huggingface/datasets/pull/8597 | 5,413,338,563 | PR_kwDODunzps8AAAABDAVYWw | 8,597 | Fix decode(num_threads) busy-poll: bridge ThreadPool results to asyncio with callbacks | {
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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 `ssl.crea... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8594 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8594/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8594/comments | https://api.github.com/repos/huggingface/datasets/issues/8594/events | https://github.com/huggingface/datasets/pull/8594 | 5,402,751,187 | PR_kwDODunzps8AAAABC3z2_A | 8,594 | Forward max_buffer_input_shards from IterableDatasetDict.shuffle | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8594). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-09-09T17:35:52 | 2026-09-10T13:32:20 | 2026-09-10T13:32:20 | null | CONTRIBUTOR | [] | null | null | false | {
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"merged_at": "2026-09-10T13:32... | ## What breaks
`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)
# TypeError: I... | {
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https://api.github.com/repos/huggingface/datasets/issues/8593 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8593/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8593/comments | https://api.github.com/repos/huggingface/datasets/issues/8593/events | https://github.com/huggingface/datasets/pull/8593 | 5,401,684,206 | PR_kwDODunzps8AAAABC28WLA | 8,593 | Preserve dataset metadata when map recombines shards | {
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} | Fixes #5967.
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 info and ... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8592 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8592/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8592/comments | https://api.github.com/repos/huggingface/datasets/issues/8592/events | https://github.com/huggingface/datasets/pull/8592 | 5,400,005,252 | PR_kwDODunzps8AAAABC1mmJA | 8,592 | fix(typing): Use Sequence instead of List for path_or_paths type annotations | {
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} | This fixes mypy errors when passing list of paths to `Dataset.from_parquet()`, `from_csv()`, `from_json()`, `from_text()`, and `IterableDataset` equivalents.
**Problem**: `List` is invariant while `Sequence` is covariant, so passing a `List[str]` to a function expecting `Union[PathLike, List[PathLike]]` fails type che... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8591 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8591/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8591/comments | https://api.github.com/repos/huggingface/datasets/issues/8591/events | https://github.com/huggingface/datasets/pull/8591 | 5,393,719,912 | PR_kwDODunzps8AAAABCwjC6Q | 8,591 | Better error when a column written as null gets values in a later batch | {
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] | 2026-09-09T01:20:29 | 2026-09-10T13:33:37 | 2026-09-10T13:33:37 | null | CONTRIBUTOR | [] | null | null | false | {
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"merged_at": "2026-09-10T13:33... | On #2831 the map still fails at HEAD, as `TypeError: Couldn't cast array of type double to null` now rather than `ArrowInvalid`. Your 2021 comment on that issue has the mechanism and both workarounds; the error itself says none of it.
So this does not change what the writer accepts. Before the cast, `ArrowWriter` now ... | {
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https://api.github.com/repos/huggingface/datasets/issues/8589 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8589/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8589/comments | https://api.github.com/repos/huggingface/datasets/issues/8589/events | https://github.com/huggingface/datasets/pull/8589 | 5,390,803,675 | PR_kwDODunzps8AAAABCuN8Og | 8,589 | Advance the user-supplied generator in Dataset.shuffle even on cache hits | {
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"merged_at": "2026-09-10T13:34... | Fixes #7127.
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 fingerpri... | {
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https://api.github.com/repos/huggingface/datasets/issues/8588 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8588/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8588/comments | https://api.github.com/repos/huggingface/datasets/issues/8588/events | https://github.com/huggingface/datasets/pull/8588 | 5,389,364,699 | PR_kwDODunzps8AAAABCtEBug | 8,588 | Let TranslationVariableLanguages encode without declared languages | {
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} | ### What is wrong
`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().encode_e... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8587 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8587/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8587/comments | https://api.github.com/repos/huggingface/datasets/issues/8587/events | https://github.com/huggingface/datasets/pull/8587 | 5,383,575,889 | PR_kwDODunzps8AAAABCoaFTQ | 8,587 | Preserve formatting selections when flattening nested columns | {
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} | ## What this changes
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 excluded an... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8586 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8586/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8586/comments | https://api.github.com/repos/huggingface/datasets/issues/8586/events | https://github.com/huggingface/datasets/pull/8586 | 5,383,163,003 | PR_kwDODunzps8AAAABCoEyUw | 8,586 | Accept a single string for metadata_filenames in folder builders | {
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} | ### The bug
`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:
```pytho... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8585 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8585/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8585/comments | https://api.github.com/repos/huggingface/datasets/issues/8585/events | https://github.com/huggingface/datasets/pull/8585 | 5,383,127,152 | PR_kwDODunzps8AAAABCoC6tA | 8,585 | Reject a non-callable generator in GeneratorConfig | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8585). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-09-08T06:38:44 | 2026-09-10T13:39:28 | 2026-09-10T13:39:28 | null | CONTRIBUTOR | [] | null | null | false | {
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"merged_at": "2026-09-10T13:39... | ### The bug
`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 is not ... | {
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https://api.github.com/repos/huggingface/datasets/issues/8584 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8584/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8584/comments | https://api.github.com/repos/huggingface/datasets/issues/8584/events | https://github.com/huggingface/datasets/pull/8584 | 5,383,085,287 | PR_kwDODunzps8AAAABCoAu8A | 8,584 | Fix the xml loader, which cannot load any file | {
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} | ### The bug
`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
FileNotFoundError: [Errno 2] No such file or ... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8583 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8583/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8583/comments | https://api.github.com/repos/huggingface/datasets/issues/8583/events | https://github.com/huggingface/datasets/pull/8583 | 5,380,921,780 | PR_kwDODunzps8AAAABCmRKAw | 8,583 | Keep every value of nested columns in Dataset.to_csv() | {
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} | `to_csv()` hands the Arrow batch to pandas, and pandas renders a list cell with numpy's repr. So it comes out space separated, and past numpy's summarization threshold of 1000 the middle is elided: a 1500-element list is written as `[ 0 1 2 ... 1497 1498 1499]` and 1494 values are gone. Struct columns and Array... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8582 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8582/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8582/comments | https://api.github.com/repos/huggingface/datasets/issues/8582/events | https://github.com/huggingface/datasets/pull/8582 | 5,377,672,496 | PR_kwDODunzps8AAAABCjuxsg | 8,582 | fix(benchmarks): rename misspelled read_unformated* helpers to read_unformatted* | {
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} | `benchmarks/benchmark_array_xd.py` defines `read_unformated` / `read_batch_unformated` / `read_col_unformated` (all call sites internal to the file). Renamed to `read_unformatted` / `read_batch_unformatted` / `read_col_unformatted`. | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8581 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8581/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8581/comments | https://api.github.com/repos/huggingface/datasets/issues/8581/events | https://github.com/huggingface/datasets/pull/8581 | 5,377,586,557 | PR_kwDODunzps8AAAABCjqe-w | 8,581 | docs: drop duplicated 'a' in the HubBucketDatasetModuleFactory docstring | {
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} | `src/datasets/load.py`: "dataset loaded from data files of **a a** Storage Bucket" → "of a Storage Bucket". Docs-only. | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8580 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8580/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8580/comments | https://api.github.com/repos/huggingface/datasets/issues/8580/events | https://github.com/huggingface/datasets/pull/8580 | 5,377,584,549 | PR_kwDODunzps8AAAABCjqYqA | 8,580 | docs: point #map anchor links at the process guide | {
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} | `docs/source/about_map_batch.mdx` and `docs/source/stream.mdx` both link an in-page `#map` anchor, but neither file has a Map heading — the "Map" section lives in `docs/source/process.mdx` (`## Map`). Both links now target `/process#map` (doc-builder cross-file style). | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8579 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8579/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8579/comments | https://api.github.com/repos/huggingface/datasets/issues/8579/events | https://github.com/huggingface/datasets/pull/8579 | 5,377,582,208 | PR_kwDODunzps8AAAABCjqRKQ | 8,579 | docs(builder): drop the stale verification_mode param from as_dataset's docstring | {
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} | `GeneratorBasedBuilder.as_dataset(self, split=None, in_memory=False)`'s docstring documents a `verification_mode` parameter (with an `<Added version="2.9.1"/>` tag). The parameter belongs to `download_and_prepare`, not `as_dataset`. The stale block is removed (the `download_and_prepare` docstring's own entry is untouch... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8578 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8578/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8578/comments | https://api.github.com/repos/huggingface/datasets/issues/8578/events | https://github.com/huggingface/datasets/pull/8578 | 5,377,578,506 | PR_kwDODunzps8AAAABCjqFSA | 8,578 | docs(dataset): match train_test_split docstring params to the signature | {
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} | `Dataset.train_test_split`'s docstring documents `train_cache_file_name` and `test_cache_file_name`; the actual parameters are `train_indices_cache_file_name` and `test_indices_cache_file_name`. The two docstring entries renamed to match. Docs-only. | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8577 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8577/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8577/comments | https://api.github.com/repos/huggingface/datasets/issues/8577/events | https://github.com/huggingface/datasets/pull/8577 | 5,376,904,249 | PR_kwDODunzps8AAAABCjIFdQ | 8,577 | Fix infinite repetition of empty iterable datasets | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8577). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-09-07T16:05:37 | 2026-09-10T13:39:06 | 2026-09-10T13:39:06 | null | CONTRIBUTOR | [] | null | null | false | {
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"merged_at": "2026-09-10T13:39... | Infinite repetition currently restarts an empty input indefinitely. For example, a streaming dataset filtered down to zero rows hangs in `dataset.repeat(None).take(1)` instead of finishing. The same problem affects an empty distributed shard and an Arrow input containing only zero-row tables.
Stop infinite repetition ... | {
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https://api.github.com/repos/huggingface/datasets/issues/8576 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8576/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8576/comments | https://api.github.com/repos/huggingface/datasets/issues/8576/events | https://github.com/huggingface/datasets/pull/8576 | 5,375,740,827 | PR_kwDODunzps8AAAABCiMYIQ | 8,576 | Honor explicit Parquet compression and encoding options | {
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} | `Dataset.to_parquet(..., compression="gzip")` raises `TypeError: ParquetWriter() got multiple values for keyword argument 'compression'` on current main. Explicit `use_dictionary` and `column_encoding` options fail for the same reason: the writer supplies defaults as named arguments while leaving the caller's values in... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8575 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8575/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8575/comments | https://api.github.com/repos/huggingface/datasets/issues/8575/events | https://github.com/huggingface/datasets/pull/8575 | 5,375,107,134 | PR_kwDODunzps8AAAABChr3kA | 8,575 | Fix async map checkpoint accounting across repeated resumes | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8575). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-09-07T13:09:29 | 2026-09-10T15:26:25 | 2026-09-10T15:26:25 | null | CONTRIBUTOR | [] | null | null | false | {
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https://api.github.com/repos/huggingface/datasets/issues/8574 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8574/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8574/comments | https://api.github.com/repos/huggingface/datasets/issues/8574/events | https://github.com/huggingface/datasets/pull/8574 | 5,372,051,142 | PR_kwDODunzps8AAAABCfMPXg | 8,574 | docs: add EvalPort ResultSet example to nested-field JSON loading | {
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} | ### What
Adds a small worked example to the "nested field" JSON section of the loading guide (`docs/source/loading.mdx`), right after the existing `field="data"` example, showing the same mechanism applied to an eval/benchmark run's results file:
```py
{"version": "1.1.0",
"suite_id": "image-description-suite",
"ru... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8573 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8573/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8573/comments | https://api.github.com/repos/huggingface/datasets/issues/8573/events | https://github.com/huggingface/datasets/pull/8573 | 5,368,296,777 | PR_kwDODunzps8AAAABCcNUwQ | 8,573 | Check the row count of every source when concatenating on axis=1 | {
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Fixes #8572
A source with no rows still contributes its columns, so horizontal concatenation has to check its row count like any other source. The empty-source filter in `_concatenate_map_style_datasets` ran before the axis dispatch, so on `axis=1` a 0-row source was removed before the "Number of rows must match" che... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8571 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8571/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8571/comments | https://api.github.com/repos/huggingface/datasets/issues/8571/events | https://github.com/huggingface/datasets/pull/8571 | 5,362,997,818 | PR_kwDODunzps8AAAABCYQTUQ | 8,571 | docs: add Simplified Chinese translation (README.zh.md) | {
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} | # What does this PR do?
Fixes #8570
This PR adds a comprehensive and high-quality Simplified Chinese translation of the project's README (`README.zh.md`) and establishes a seamless bidirectional language switcher in both English and Chinese documentation.
## Summary of Changes
- **New File `README.zh.md`**: Fully a... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8569 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8569/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8569/comments | https://api.github.com/repos/huggingface/datasets/issues/8569/events | https://github.com/huggingface/datasets/pull/8569 | 5,362,816,936 | PR_kwDODunzps8AAAABCYH0mQ | 8,569 | Shard the sources when skipping a distributed IterableDataset | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8569). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-09-06T04:20:37 | 2026-09-10T13:35:10 | 2026-09-10T13:35:09 | null | CONTRIBUTOR | [] | null | null | false | {
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https://api.github.com/repos/huggingface/datasets/issues/8567 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8567/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8567/comments | https://api.github.com/repos/huggingface/datasets/issues/8567/events | https://github.com/huggingface/datasets/pull/8567 | 5,356,995,018 | PR_kwDODunzps8AAAABCTtPQw | 8,567 | Fix typo in guide template | {
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} | Fixes `repace` → `replace` in `templates/README_guide.md` (the template used to generate dataset guides, so the typo propagates). Docs-only change. | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8566 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8566/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8566/comments | https://api.github.com/repos/huggingface/datasets/issues/8566/events | https://github.com/huggingface/datasets/pull/8566 | 5,351,996,199 | PR_kwDODunzps8AAAABCPzgMA | 8,566 | Fix Pdf.decode_example raising TypeError on remote non-Hub paths | {
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"merged_at": "2026-09-09T14:08... | `Pdf.decode_example` on a remote path outside the Hub raised before any download:
```
>>> Pdf().decode_example({"path": "https://example.com/a.pdf", "bytes": None})
TypeError: 'NoneType' object is not subscriptable # src/datasets/features/pdf.py:158
```
`string_to_dict` returns `None` when the URL does not match th... | {
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https://api.github.com/repos/huggingface/datasets/issues/8565 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8565/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8565/comments | https://api.github.com/repos/huggingface/datasets/issues/8565/events | https://github.com/huggingface/datasets/pull/8565 | 5,351,961,440 | PR_kwDODunzps8AAAABCPxt9Q | 8,565 | Add a strategy argument to split_dataset_by_node for iterable datasets | {
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"The docs for this PR live [here](h... | 2026-09-04T19:01:51 | 2026-09-09T13:54:28 | 2026-09-09T13:54:28 | null | CONTRIBUTOR | [] | null | null | false | {
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"merged_at": "2026-09-09T13:54... | Closes #8253 by adding the explicit splitting-strategy argument that @lhoestq asked for in that thread.
```python
split_dataset_by_node(ds, rank, world_size, strategy="auto" | "shards" | "examples")
```
- `"auto"`: unchanged. Shards are assigned when `num_shards % world_size == 0`, otherwise each node keeps one examp... | {
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https://api.github.com/repos/huggingface/datasets/issues/8564 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8564/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8564/comments | https://api.github.com/repos/huggingface/datasets/issues/8564/events | https://github.com/huggingface/datasets/pull/8564 | 5,350,632,838 | PR_kwDODunzps8AAAABCOtV6g | 8,564 | Print the repr these feature examples actually produce | {
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} | ### What breaks
Four feature classes show a repr in their `Examples` block that they cannot print.
```
>>> ds.features["image"]
Image(decode=True, id=None)
```
`Image`, `Pdf`, `Nifti` and `Video` all declare `id: Optional[str] = field(default=None, repr=False)`, so `id=None` never appears. On top of that `Image` has... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8563 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8563/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8563/comments | https://api.github.com/repos/huggingface/datasets/issues/8563/events | https://github.com/huggingface/datasets/pull/8563 | 5,350,057,870 | PR_kwDODunzps8AAAABCOPtdA | 8,563 | Raise clear errors for missing folder metadata files | {
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"Thanks—addressed both main points in d46f5a899: `load_dataset()` now surfaces the `FileNotFoundError` detail, and the regression test now exercises `load_dataset()` and asserts the cause chain.",
"Read the new commit, and that covers both points: the top-level message now carries the filename, and the test goes ... | 2026-09-04T15:38:16 | 2026-09-05T19:28:22 | null | null | NONE | [] | null | null | false | {
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} | ## Summary
- validate local files referenced by folder metadata during example generation
- report both the missing file and the metadata file that references it
- preserve lazy access for remote files
## Testing
- `pytest -q tests/packaged_modules/test_folder_based_builder.py tests/packaged_modules/test_imagefolder... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8562 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8562/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8562/comments | https://api.github.com/repos/huggingface/datasets/issues/8562/events | https://github.com/huggingface/datasets/pull/8562 | 5,343,106,571 | PR_kwDODunzps8AAAABCItE_A | 8,562 | Keep the declared dtype for an empty column under numpy format | {
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} | Fixes #8469.
Under numpy format a column holding zero rows came back as float32 no matter what dtype it was declared with, while the same column kept its dtype as soon as it held one row. pandas and arrow were unaffected.
```python
feats = Features({"a": Value("int64")})
ds = Dataset.from_dict({"a": [1, 2, 3]}, featu... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8561 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8561/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8561/comments | https://api.github.com/repos/huggingface/datasets/issues/8561/events | https://github.com/huggingface/datasets/pull/8561 | 5,342,068,525 | PR_kwDODunzps8AAAABCH5b_w | 8,561 | Bump fsspec upper bound to 2026.7.0 | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8561). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-09-03T22:25:11 | 2026-09-10T13:34:42 | 2026-09-10T13:34:42 | null | CONTRIBUTOR | [] | null | null | false | {
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"merged_at": "2026-09-10T13:34... | ## Summary
- bump the fsspec upper bound from 2026.6.0 to 2026.7.0
- keep the existing minimum version unchanged
Fixes #8560
## Tests
- python -m pytest -q tests/test_filesystem.py (8 passed, 2 skipped)
- python -m pytest -q tests/test_file_utils.py tests/test_data_files.py tests/test_streaming_download_manager.py ... | {
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https://api.github.com/repos/huggingface/datasets/issues/8559 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8559/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8559/comments | https://api.github.com/repos/huggingface/datasets/issues/8559/events | https://github.com/huggingface/datasets/pull/8559 | 5,341,396,776 | PR_kwDODunzps8AAAABCHXIsg | 8,559 | Fix the repeat docstring examples | {
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} | ### What is wrong
`Dataset.repeat`'s example calls `ds.take(2).repeat(2)`, which returns **four** rows, but the output printed under it has **six**: three distinct reviews, each twice.
`IterableDataset.repeat` carries the same example, and its `load_dataset` call is missing `streaming=True`, so it builds a `Dataset` ... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8558 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8558/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8558/comments | https://api.github.com/repos/huggingface/datasets/issues/8558/events | https://github.com/huggingface/datasets/pull/8558 | 5,329,827,722 | PR_kwDODunzps8AAAABB-FZdw | 8,558 | Close the Arrow writer when finalize() fails | {
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} | Fixes #6917.
## Root cause
`_prepare_split_single` finalises the writer inside a `finally` block, in both builders (`builder.py:1558-1563` for `GeneratorBasedBuilder`, `builder.py:1864-1869` for `ArrowBasedBuilder`):
```python
finally:
yield job_id, False, num_examples_progress_update
num_shards = shard_id +... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8557 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8557/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8557/comments | https://api.github.com/repos/huggingface/datasets/issues/8557/events | https://github.com/huggingface/datasets/pull/8557 | 5,327,772,466 | PR_kwDODunzps8AAAABB8bvfQ | 8,557 | Support JPEG XL images via pillow-jxl-plugin | {
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"@lhoestq ready for a look when you have a moment. Small change: `.jxl` in the image extension lists plus importing installed Pillow plugins before `Image.open`, which is what #8537 actually needed. CI is green."
] | 2026-09-02T18:34:06 | 2026-09-09T02:15:20 | null | null | CONTRIBUTOR | [] | null | null | false | {
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} | Fixes #8537.
## What
- `.jxl` added to the `imagefolder` and `webdataset` image extensions.
- `Image.decode_example` now imports the third-party Pillow plugins that are installed (`pillow_jxl` for now) before calling `PIL.Image.open`, via a small `_import_pil_plugins()` helper and a `config.PILLOW_JXL_AVAILABLE` flag... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8556 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8556/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8556/comments | https://api.github.com/repos/huggingface/datasets/issues/8556/events | https://github.com/huggingface/datasets/pull/8556 | 5,322,195,848 | PR_kwDODunzps8AAAABB38ncA | 8,556 | fix: Raise ValueError for batch_size <= 0 in Dataset.batch and IterableDataset.batch | {
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} | ## Description
`batch(0)` and `batch(-1)` silently returned the whole dataset instead of raising an error. This is dangerous because a batch_size computed at runtime that comes out as 0 (e.g., from an empty config or integer division) would silently return the entire dataset.
The fix adds validation to both `Dataset.... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8555 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8555/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8555/comments | https://api.github.com/repos/huggingface/datasets/issues/8555/events | https://github.com/huggingface/datasets/pull/8555 | 5,322,182,027 | PR_kwDODunzps8AAAABB376LQ | 8,555 | fix: Handle negative percent split boundaries correctly | {
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"Addressed the reproduced negative-percent regression in c9517a7. _rel_to_abs_instr now decides end-relative addressing from the written sign before rounding, so -10% remains relative to the end under pct1_dropremainder and small -1% boundaries do not lose their sign. Added boundary tests. Passed with PYTHONPATH=sr... | 2026-09-02T09:29:30 | 2026-09-04T07:14:09 | null | null | NONE | [] | null | null | false | {
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} | ## Description
When using negative percentages like `train[-1%:]`, the sign was lost after rounding. For example, -1% of 30 examples rounds to 0, so `train[-1%:]` would return the whole dataset instead of the last 1%.
The fix converts negative percentages to their positive equivalents (`100 + from_%`) before rounding... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8554 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8554/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8554/comments | https://api.github.com/repos/huggingface/datasets/issues/8554/events | https://github.com/huggingface/datasets/pull/8554 | 5,322,161,046 | PR_kwDODunzps8AAAABB361jg | 8,554 | fix: Normalize negative indices in Dataset.select to fix OverflowError | {
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Dataset.select raised OverflowError for negative indices like -1, even though they are valid (e.g., -1 means last element). The issue was that pyarrow's uint64 array can't hold negative values.
The fix normalizes negative indices to positive ones after validation but before converting to pyarrow array.... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8553 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8553/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8553/comments | https://api.github.com/repos/huggingface/datasets/issues/8553/events | https://github.com/huggingface/datasets/pull/8553 | 5,322,140,555 | PR_kwDODunzps8AAAABB35yTw | 8,553 | fix: Add per-element validation to ClassLabel.str2int and int2str | {
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} | ## Description
ClassLabel.str2int and int2str were validating only the container (the list), not the elements inside it. This caused silent failures:
- `str2int([1])` returned `[1]` instead of raising ValueError
- `int2str([1.7])` returned `['pos']` (truncated float) instead of raising ValueError
## Fix
1. **str2in... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8552 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8552/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8552/comments | https://api.github.com/repos/huggingface/datasets/issues/8552/events | https://github.com/huggingface/datasets/pull/8552 | 5,322,122,794 | PR_kwDODunzps8AAAABB344Tg | 8,552 | fix: Remove double-wrapping of storage_options in xPath.glob | {
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The `xPath.glob` method was double-wrapping storage_options when calling `url_to_fs`.
The `_prepare_path_and_storage_options` function already returns storage_options keyed by protocol (e.g., `{protocol: options}`), but the code was re-wrapping it as `{protocol: {protocol: options}}`, causing fsspec t... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8551 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8551/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8551/comments | https://api.github.com/repos/huggingface/datasets/issues/8551/events | https://github.com/huggingface/datasets/pull/8551 | 5,319,937,339 | PR_kwDODunzps8AAAABB2KANg | 8,551 | Fix docstring argument names that don't match signatures | {
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"Gentle check-in on this one — it's been about a week.\n\nIt's a small docs-only change: three docstrings document parameters that don't exist on the function, so the published docs give argument names that raise `TypeError`. The most user-facing is `Dataset.train_test_split`, where the docs say `train_cache_file_n... | 2026-09-02T05:01:42 | 2026-09-09T13:52:32 | null | null | NONE | [] | null | null | false | {
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} | Three docstrings document parameters that don't exist on the function, so the rendered docs advertise arguments that raise `TypeError`.
| Location | Documented | Actual signature |
|---|---|---|
| `Dataset.train_test_split` | `train_cache_file_name`, `test_cache_file_name` | `train_indices_cache_file_name`, `test_indi... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8550 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8550/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8550/comments | https://api.github.com/repos/huggingface/datasets/issues/8550/events | https://github.com/huggingface/datasets/pull/8550 | 5,319,487,114 | PR_kwDODunzps8AAAABB1zrzA | 8,550 | docs: relabel directional classes on horizontal flips | {
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} | Fixes huggingface/datasets#8522
## Summary
- Add a semantic segmentation section on swapping left/right class IDs during horizontal flips
- Show a NumPy-only `set_transform` recipe for the human parsing dataset
- Mention AlbumentationsX as an optional path with license notes
## Test plan
- [x] Docs reviewed locally; ... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8549 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8549/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8549/comments | https://api.github.com/repos/huggingface/datasets/issues/8549/events | https://github.com/huggingface/datasets/pull/8549 | 5,319,483,712 | PR_kwDODunzps8AAAABB1zgdg | 8,549 | fix: use Sequence for path_or_paths type hints | {
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} | Fixes huggingface/datasets#5354
## Summary
- Replace `list[PathLike]` with `Sequence[PathLike]` in `from_csv`, `from_json`, `from_parquet`, and `from_text` signatures
## Test plan
- [x] Type-only change; no runtime behavior change | null | {
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