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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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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... | null | {
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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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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 | {
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} | ### 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 | 2026-09-30T15:10:53 | null | null | NONE | [] | null | null | null | null | 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... | null | {
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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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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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`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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} | ## Problem
`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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https://api.github.com/repos/huggingface/datasets/issues/8708 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8708/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8708/comments | https://api.github.com/repos/huggingface/datasets/issues/8708/events | https://github.com/huggingface/datasets/pull/8708 | 5,624,930,451 | PR_kwDODunzps8AAAABFn8K7A | 8,708 | Raise instead of hanging on a probability-0 source without replacement | {
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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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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... | null | {
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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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} | ### Describe the bug
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.... | null | {
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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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} | ### Describe the problem
`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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} | ### Describe the problem
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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https://api.github.com/repos/huggingface/datasets/issues/8703 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8703/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8703/comments | https://api.github.com/repos/huggingface/datasets/issues/8703/events | https://github.com/huggingface/datasets/pull/8703 | 5,607,247,411 | PR_kwDODunzps8AAAABFZyNpQ | 8,703 | Cap lock filename so the total path stays under MAX_PATH on Windows | {
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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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https://api.github.com/repos/huggingface/datasets/issues/8702 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8702/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8702/comments | https://api.github.com/repos/huggingface/datasets/issues/8702/events | https://github.com/huggingface/datasets/issues/8702 | 5,607,241,083 | I_kwDODunzps8AAAABTje1ew | 8,702 | Windows: `load_dataset` fails with WinError 206 for moderately deep `cache_dir` because the lock filename duplicates the whole path | {
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} | ### Describe the bug
On Windows, `load_dataset()` fails with `FileNotFoundError: [WinError 206] The filename or extension is too long` for cache directories that are only moderately deep (~85+ characters, e.g. a OneDrive Documents folder), well before Windows' actual 260-character `MAX_PATH` limit would justify it.
C... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8701 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8701/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8701/comments | https://api.github.com/repos/huggingface/datasets/issues/8701/events | https://github.com/huggingface/datasets/pull/8701 | 5,607,088,434 | PR_kwDODunzps8AAAABFZqTkQ | 8,701 | Implement __arrow_array__ on PandasArrayExtensionArray so ArrayXD columns can go back from pandas to Arrow | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8701). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-09-27T23:04:45 | 2026-09-30T15:06:19 | null | null | NONE | [] | null | null | null | null | Fixes #8699
`Dataset.to_pandas()` returns ArrayXD columns as `PandasArrayExtensionArray`, but that extension array never implemented pyarrow's `__arrow_array__` protocol, so `pa.Table.from_pandas` raised `ArrowTypeError: Did not pass numpy.dtype object`. This broke `Dataset.from_pandas(ds.to_pandas())` and `ds.with_fo... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8700 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8700/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8700/comments | https://api.github.com/repos/huggingface/datasets/issues/8700/events | https://github.com/huggingface/datasets/pull/8700 | 5,607,087,134 | PR_kwDODunzps8AAAABFZqPIA | 8,700 | Fix torchcodec docs links | {
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"followers_url": "https://api.github.com/users/pratikg... | [] | closed | false | [] | null | [] | 2026-09-27T23:04:36 | 2026-09-30T15:04:01 | 2026-09-30T15:04:01 | null | CONTRIBUTOR | [] | null | null | null | null | The torchcodec documentation moved from `docs.pytorch.org/torchcodec/` to `meta-pytorch.org/torchcodec/`; the `AudioDecoder` link in `audio_load.mdx` and the `VideoDecoder` link in `video_load.mdx` currently 404. Both new URLs verified live. | {
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https://api.github.com/repos/huggingface/datasets/issues/8699 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8699/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8699/comments | https://api.github.com/repos/huggingface/datasets/issues/8699/events | https://github.com/huggingface/datasets/issues/8699 | 5,607,085,315 | I_kwDODunzps8AAAABTjVVAw | 8,699 | Dataset.from_pandas and pandas-formatted map fail on ArrayXD columns: PandasArrayExtensionArray has no __arrow_array__ | {
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} | ### Describe the bug
`Dataset.to_pandas()` returns `Array2D`/`Array3D`/... columns as `datasets.features.features.PandasArrayExtensionArray`. That pandas extension array does not implement pyarrow's `__arrow_array__` protocol, so converting such a DataFrame back to Arrow raises `ArrowTypeError: Did not pass numpy.dtyp... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8696 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8696/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8696/comments | https://api.github.com/repos/huggingface/datasets/issues/8696/events | https://github.com/huggingface/datasets/pull/8696 | 5,604,478,773 | PR_kwDODunzps8AAAABFXpjGg | 8,696 | Fix DatasetInfosDict metadata overwrite | {
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## Summary
`DatasetInfosDict.write_to_directory(..., overwrite=True)` raises
`AttributeError: 'dict' object has no attribute 'to_dataset_card_data'` for
nonempty input. The writer initializes its collection as a plain `dict`; if a
legacy `dataset_infos.json` exists, ... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8695 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8695/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8695/comments | https://api.github.com/repos/huggingface/datasets/issues/8695/events | https://github.com/huggingface/datasets/pull/8695 | 5,603,476,994 | PR_kwDODunzps8AAAABFW4P6w | 8,695 | Keep take/skip counts when there are more DataLoader workers than shards | {
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```python
import torch
from datasets import Dataset
ds = Dataset.from_dict({"id": list(range(10_000))}).to_iterable_dataset(num_shards=1)
for name, pipe in [("take(1000)", ds.take(100... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8694 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8694/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8694/comments | https://api.github.com/repos/huggingface/datasets/issues/8694/events | https://github.com/huggingface/datasets/pull/8694 | 5,602,935,755 | PR_kwDODunzps8AAAABFWeCzg | 8,694 | [docs] Fix HF_HOME example in cache guide | {
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Truth, `src/datasets/config.py`:
```python
HF_CACHE_HOME = os.pat... | {
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https://api.github.com/repos/huggingface/datasets/issues/8693 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8693/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8693/comments | https://api.github.com/repos/huggingface/datasets/issues/8693/events | https://github.com/huggingface/datasets/pull/8693 | 5,600,845,890 | PR_kwDODunzps8AAAABFU6i5g | 8,693 | fix: use Sequence instead of List for PathLike type annotations (fixes #5354) | {
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This PR addresses issue #5354 by changing the type annotation for path_or_paths parameters from Union[PathLike, list[PathLike]] to Union[PathLike, Sequence[PathLike]] in rrow_dataset.py.
## Changes
- Updated 4 method signatures in src/datasets/arrow_dataset.py:
- rom_csv
- rom_json
- rom_par... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8692 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8692/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8692/comments | https://api.github.com/repos/huggingface/datasets/issues/8692/events | https://github.com/huggingface/datasets/pull/8692 | 5,598,828,262 | PR_kwDODunzps8AAAABFTcV6w | 8,692 | Fix schema alignment for buffered single-row Arrow tables | {
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https://api.github.com/repos/huggingface/datasets/issues/8691 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8691/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8691/comments | https://api.github.com/repos/huggingface/datasets/issues/8691/events | https://github.com/huggingface/datasets/pull/8691 | 5,597,365,132 | PR_kwDODunzps8AAAABFST6Hg | 8,691 | Fix OverflowError for uint64 values above the int64 range | {
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A `Value("uint64")` column cannot hold values above `2**63 - 1` when the data arrives as Python ints, which is how 64-bit hashes (simhash, minhash, xxhash64) usually arrive:
```python
from datasets import Dataset, Features, Value
features = Features({"simhash": Value("uint64")})
ds = Dataset.from_dict({... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8690 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8690/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8690/comments | https://api.github.com/repos/huggingface/datasets/issues/8690/events | https://github.com/huggingface/datasets/pull/8690 | 5,595,719,065 | PR_kwDODunzps8AAAABFRDfZQ | 8,690 | Raise a clear error for out-of-bounds IterableDataset.shard arguments | {
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`IterableDataset.shard` documents that *"n should be less or equal to the number of shards in the dataset `dataset.num_shards`"*, but violating that (or passing `index >= num_shards`) crashes with an **opaque `IndexError`** from deep inside `_merge_gen_kwargs`:
```python
>>> from datasets import IterableDa... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8689 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8689/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8689/comments | https://api.github.com/repos/huggingface/datasets/issues/8689/events | https://github.com/huggingface/datasets/pull/8689 | 5,595,468,093 | PR_kwDODunzps8AAAABFQ3ZFw | 8,689 | Accept numpy integers in ClassLabel.int2str | {
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`ClassLabel.int2str` rejects numpy integer scalars even though the error message itself advertises numpy support:
```python
>>> from datasets import ClassLabel
>>> import numpy as np
>>> cl = ClassLabel(names=["negative", "positive"])
>>> cl.int2str(np.int64(0))
ValueError: Values 0 should be an integer or... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8688 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8688/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8688/comments | https://api.github.com/repos/huggingface/datasets/issues/8688/events | https://github.com/huggingface/datasets/pull/8688 | 5,590,746,721 | PR_kwDODunzps8AAAABFNU15g | 8,688 | Cast large_string and string_view storage in ClassLabel | {
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Arrow... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8687 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8687/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8687/comments | https://api.github.com/repos/huggingface/datasets/issues/8687/events | https://github.com/huggingface/datasets/pull/8687 | 5,590,745,810 | PR_kwDODunzps8AAAABFNUzFg | 8,687 | Forward constructor arguments through the FileLock wrapper | {
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https://api.github.com/repos/huggingface/datasets/issues/8686 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8686/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8686/comments | https://api.github.com/repos/huggingface/datasets/issues/8686/events | https://github.com/huggingface/datasets/pull/8686 | 5,589,669,769 | PR_kwDODunzps8AAAABFMf5Ew | 8,686 | fix: forward FileLock constructor arguments so timeout and singleton work | {
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datasets FileLock only declared lock_file plus *args and **kwargs. filelock looks at named parameters on the subclass, so timeout, mode, and is_singleton never reached the lock. The wrapper also wrote a concrete umask mode, and singleton reuse then compared that mode to the unset sentinel and raised.
This... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8685 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8685/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8685/comments | https://api.github.com/repos/huggingface/datasets/issues/8685/events | https://github.com/huggingface/datasets/pull/8685 | 5,585,152,002 | PR_kwDODunzps8AAAABFI-kfA | 8,685 | Fix streaming dataset features after map/add_column | {
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"I feel like it can be too expensive to always have to infer features, that's why it wasn't implement in the first place, wdyt ?"
] | 2026-09-25T15:51:29 | 2026-09-30T15:05:41 | null | null | NONE | [] | null | null | null | null | Fixes #5752
## What changed?
1. Preserves existing features when `map()` is called without an explicit `features` parameter (including identity functions like `map(lambda x: x)`)
2. Properly removes features for columns specified in `remove_columns`
3. Adds a `feature` parameter to `add_column()` (consistent with the ... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8684 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8684/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8684/comments | https://api.github.com/repos/huggingface/datasets/issues/8684/events | https://github.com/huggingface/datasets/pull/8684 | 5,580,766,374 | PR_kwDODunzps8AAAABFFf4Cg | 8,684 | Skip constructing disabled tqdm progress bars in map_nested | {
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`map_nested` is called for every example by the tensor formatters (e.g. `TorchFormatter.recursive_tensorize`). It wrapped its iterable in an `hf_tqdm` object even when `disable_tqdm=True`, which is the default. The same happened in `_single_map_nested` for ev... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8683 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8683/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8683/comments | https://api.github.com/repos/huggingface/datasets/issues/8683/events | https://github.com/huggingface/datasets/pull/8683 | 5,580,532,024 | PR_kwDODunzps8AAAABFFUF2A | 8,683 | Compute the numpy version check once in NumpyArrowExtractor | {
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`_arrow_array_to_numpy()` parsed `np.__version__` with `np.lib.NumpyVersion` for every extracted column, i.e. once per column per row when iterating a formatted `IterableDataset`. | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8682 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8682/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8682/comments | https://api.github.com/repos/huggingface/datasets/issues/8682/events | https://github.com/huggingface/datasets/pull/8682 | 5,574,454,824 | PR_kwDODunzps8AAAABFAc_gQ | 8,682 | Fix Json.cast_storage double-encoding large_string and string_view columns | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8682). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-09-24T20:55:22 | 2026-09-30T15:09:28 | null | null | NONE | [] | null | null | null | null | `Json.cast_storage` only treats a `pa.StringArray` as already holding JSON text. `large_string` and `string_view` arrays are not subclasses of it, so they fall through to the generic branch and every value gets JSON-encoded a second time. The column then decodes back to plain strings instead of objects, and no error is... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8681 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8681/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8681/comments | https://api.github.com/repos/huggingface/datasets/issues/8681/events | https://github.com/huggingface/datasets/issues/8681 | 5,573,876,336 | I_kwDODunzps8AAAABTDqacA | 8,681 | Casting `large_string` / `string_view` to ClassLabel fails, so `Dataset.from_pandas(df, features=ClassLabel)` breaks with pandas 3 | {
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} | ### Describe the bug
`ClassLabel.cast_storage` only maps label strings to ids when the storage is a `pa.StringArray` (`src/datasets/features/features.py`, ~L1195: `elif isinstance(storage, pa.StringArray):`). `pa.LargeStringArray` and `pa.StringViewArray` are not subclasses of it, so they skip the mapping and go strai... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8680 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8680/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8680/comments | https://api.github.com/repos/huggingface/datasets/issues/8680/events | https://github.com/huggingface/datasets/pull/8680 | 5,572,599,054 | PR_kwDODunzps8AAAABE--VtQ | 8,680 | Don't import aiohttp when importing datasets | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8680). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-09-24T18:13:55 | 2026-09-30T15:11:18 | null | null | NONE | [] | null | null | null | null | `import datasets` imports aiohttp just to reference `aiohttp.ClientError` in the two retry `except` clauses in `file_utils.py`. That's about 50 ms of a ~470 ms import (`python -X importtime -c "import datasets"`), and nothing else imports aiohttp at that point.
This looks the error type up when the `except` clause run... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8679 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8679/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8679/comments | https://api.github.com/repos/huggingface/datasets/issues/8679/events | https://github.com/huggingface/datasets/pull/8679 | 5,570,032,350 | PR_kwDODunzps8AAAABE86e4Q | 8,679 | Fix Dataset.select OverflowError on negative indices | {
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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 positions b... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8678 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8678/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8678/comments | https://api.github.com/repos/huggingface/datasets/issues/8678/events | https://github.com/huggingface/datasets/pull/8678 | 5,568,253,164 | PR_kwDODunzps8AAAABE7gB8w | 8,678 | Bump huggingface_hub upper bound to <3.0 (datasets) | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8678). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-09-24T12:24:34 | 2026-09-24T14:40:02 | null | null | CONTRIBUTOR | [] | null | null | null | null | ### Requires `transformers` release for CI to pass (i.e. https://github.com/huggingface/transformers/pull/49083)
---
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/huggingface_hub/... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8677 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8677/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8677/comments | https://api.github.com/repos/huggingface/datasets/issues/8677/events | https://github.com/huggingface/datasets/pull/8677 | 5,562,099,530 | PR_kwDODunzps8AAAABE2uIHg | 8,677 | Fix inverted span for minus-strand multi-exon GenBank locations | {
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"good catch ! cc @behroozazarkhalili for viz \r\n\r\nrelated to https://github.com/huggingface/datasets/pull/7951",
"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8677). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 da... | 2026-09-24T02:24:28 | 2026-09-30T17:08:47 | null | null | NONE | [] | null | null | null | null | ## What was wrong
`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 not f... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8676 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8676/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8676/comments | https://api.github.com/repos/huggingface/datasets/issues/8676/events | https://github.com/huggingface/datasets/pull/8676 | 5,561,659,886 | PR_kwDODunzps8AAAABE2Y-3Q | 8,676 | Fix JSON loader when mixed-shape JSONL chunks differ by keys | {
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"I feel like it could hold too much data in memory for this, and in this case increasing the chunksize should work no ?",
"Increasing `chunksize` works for the small repro (at 1000 it stays one chunk). On a large sorted file the default 10MB still splits shape A from B, so concat fails the same way.\n\nAgree hold... | 2026-09-24T01:24:26 | 2026-10-01T01:18:01 | null | null | NONE | [] | null | null | null | null | Fixes #8675.
`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 (`pa.unif... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8675 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8675/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8675/comments | https://api.github.com/repos/huggingface/datasets/issues/8675/events | https://github.com/huggingface/datasets/issues/8675 | 5,560,824,749 | I_kwDODunzps8AAAABS3NzrQ | 8,675 | load_dataset("json") fails on mixed-shape JSONL when a chunksize boundary separates the shapes | {
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"Hi, I'd like to work on this issue.\n\nI'll first reproduce the failure with a focused test, then investigate how schemas are inferred and aligned across JSONL chunks in `Json._generate_tables`.\n\nMy initial approach is to make chunked loading consistent with single-chunk loading by unifying the columns and filli... | 2026-09-23T23:31:51 | 2026-09-24T00:46:12 | null | null | NONE | [] | null | null | {
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} | ### Describe the bug
`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` batch... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8674 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8674/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8674/comments | https://api.github.com/repos/huggingface/datasets/issues/8674/events | https://github.com/huggingface/datasets/pull/8674 | 5,553,887,490 | PR_kwDODunzps8AAAABEwNmCg | 8,674 | Key parquet column options by leaf path so nested columns get compressed | {
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] | 2026-09-23T13:07:47 | 2026-09-30T15:14:12 | null | null | CONTRIBUTOR | [] | null | null | null | null | Fixes #8671
## 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 columns nev... | null | {
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