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https://api.github.com/repos/huggingface/datasets/issues/8875 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8875/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8875/comments | https://api.github.com/repos/huggingface/datasets/issues/8875/events | https://github.com/huggingface/datasets/pull/8875 | 5,983,246,086 | PR_kwDODunzps8AAAABKEVyyg | 8,875 | Honor table policies when exporting empty datasets to SQL | {
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} | Exporting an empty dataset skips the SQL writer entirely. As a result, `if_exists="replace"` returns zero while leaving old rows in the table, `if_exists="fail"` accepts an existing table, and exporting a new empty split leaves its table missing.
Write one empty batch through the existing pandas conversion so the requ... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8874 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8874/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8874/comments | https://api.github.com/repos/huggingface/datasets/issues/8874/events | https://github.com/huggingface/datasets/pull/8874 | 5,979,277,226 | PR_kwDODunzps8AAAABKBN9VQ | 8,874 | Preserve unrestricted filters when extending data-file patterns | {
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} | ## Summary
Preserve unrestricted extension filters when calling `DataFilesPatternsList.filter_extensions`.
`DataFilesPatternsList.from_patterns(["*"])` stores `allowed_extensions=[None]`, where `None` means unrestricted. Calling `.filter_extensions([".json"])` currently attempts `None + [".json"]` and raises `TypeErr... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8873 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8873/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8873/comments | https://api.github.com/repos/huggingface/datasets/issues/8873/events | https://github.com/huggingface/datasets/pull/8873 | 5,977,320,000 | PR_kwDODunzps8AAAABJ_o3Mw | 8,873 | Fix doubled words in load.py docstring and process docs | {
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} | ## What
Removed a duplicated 'a' in a load.py docstring ('of a a Storage Bucket') and a duplicated 'to' in docs/source/process.mdx ('save it to to push_to_hub').
## Why
A small, objectively-verifiable improvement (typo) found during a
daily open-source maintenance pass (2026-10-22).
## How verified
Found both with a ... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8872 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8872/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8872/comments | https://api.github.com/repos/huggingface/datasets/issues/8872/events | https://github.com/huggingface/datasets/pull/8872 | 5,975,371,876 | PR_kwDODunzps8AAAABJ-EYoA | 8,872 | Preserve grouped streaming batches when resuming checkpoints | {
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} | `IterableDataset.batch(by_column=...)` can silently drop a complete group after an ordinary checkpoint restore. For example, group IDs 0–8 into triples, consume the first two groups, then save and reload state: uninterrupted iteration returns `[6, 7, 8]`, while current main returns nothing.
The grouping callback buffe... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8871 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8871/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8871/comments | https://api.github.com/repos/huggingface/datasets/issues/8871/events | https://github.com/huggingface/datasets/pull/8871 | 5,974,424,182 | PR_kwDODunzps8AAAABJ9Ty0g | 8,871 | Honor batch_size when exporting an IterableDataset to Parquet | {
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} | `IterableDataset.to_parquet(..., batch_size=2)` currently ignores the requested batch size: exporting seven rows creates a single seven-row Parquet row group, while `Dataset.to_parquet` creates row groups of `[2, 2, 2, 1]`. This prevents callers from controlling the row groups used when exporting streaming training dat... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8870 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8870/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8870/comments | https://api.github.com/repos/huggingface/datasets/issues/8870/events | https://github.com/huggingface/datasets/pull/8870 | 5,972,833,087 | PR_kwDODunzps8AAAABJ8DYIQ | 8,870 | Avoid copying WebDataset binary payloads during schema inference | {
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} | WebDataset schema inference currently builds Arrow tables containing the complete binary payloads from its first examples. A single value above Arrow's binary offset limit raises `ArrowCapacityError`, even with `streaming=True`.
Use empty byte strings only in the temporary examples passed to schema inference. This pre... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8869 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8869/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8869/comments | https://api.github.com/repos/huggingface/datasets/issues/8869/events | https://github.com/huggingface/datasets/pull/8869 | 5,972,157,921 | PR_kwDODunzps8AAAABJ7hj3Q | 8,869 | Unescape doubled quotes in GenBank qualifier values | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8869). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-10-22T02:52:20 | 2026-10-22T10:43:33 | 2026-10-22T10:43:33 | null | CONTRIBUTOR | [] | null | null | false | {
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https://api.github.com/repos/huggingface/datasets/issues/8868 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8868/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8868/comments | https://api.github.com/repos/huggingface/datasets/issues/8868/events | https://github.com/huggingface/datasets/pull/8868 | 5,970,386,363 | PR_kwDODunzps8AAAABJ6IhkA | 8,868 | Raise on duplicate column names in Dataset.select_columns | {
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} | `Dataset.select_columns` accepts a list with repeated names and returns a dataset that looks fine but breaks on first use:
```python
from datasets import Dataset
ds = Dataset.from_dict({"a": [1, 2], "b": [3, 4]})
sel = ds.select_columns(["a", "a"])
print(sel.column_names, len(sel.features)) # ['a', 'a'] 1
sel[0] ... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8867 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8867/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8867/comments | https://api.github.com/repos/huggingface/datasets/issues/8867/events | https://github.com/huggingface/datasets/pull/8867 | 5,944,509,212 | PR_kwDODunzps8AAAABJlXwiQ | 8,867 | Preserve rows when concatenating pandas ArrayXD batches | {
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} | `PandasArrayExtensionArray._concat_same_type` can turn whole input batches into individual rows. For example, concatenating dense batches with 2 and 1 rows returns 2 rows instead of 3, with an extra batch dimension inside each row. A single input chunk is also wrapped as one row. Equally sized object-backed chunks take... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8866 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8866/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8866/comments | https://api.github.com/repos/huggingface/datasets/issues/8866/events | https://github.com/huggingface/datasets/pull/8866 | 5,943,309,841 | PR_kwDODunzps8AAAABJkZ4jg | 8,866 | Fix forwarding custom User-Agent to fsspec HTTP requests | {
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} | ## Summary
Related to #6046.
Forward the configured DownloadConfig.user_agent to fsspec HTTP/HTTPS requests.
- Reuse the existing get_datasets_user_agent() helper.
- Preserve explicitly configured User-Agent headers.
- Keep existing HTTP proxy handling unchanged.
- Add regression tests for default and custom header ... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8865 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8865/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8865/comments | https://api.github.com/repos/huggingface/datasets/issues/8865/events | https://github.com/huggingface/datasets/pull/8865 | 5,939,230,188 | PR_kwDODunzps8AAAABJhKMkg | 8,865 | Fix concatenation cache fingerprints for different axes | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8865). 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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## What does this PR do?
Fixes #8859
Concatenating the same datasets using different axes can produce the same fingerprint. As a result, `map()` can reuse cached results from the wrong concatenation without warning.
This change adds `axis` to the existing fingerprint calculation and adds two regression tests for bo... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8864 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8864/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8864/comments | https://api.github.com/repos/huggingface/datasets/issues/8864/events | https://github.com/huggingface/datasets/pull/8864 | 5,939,167,230 | PR_kwDODunzps8AAAABJhHAeA | 8,864 | Keep threaded decoding reconfigurable after IterableDataset.shard | {
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} | Since #8791, `load_dataset(..., streaming=True)` decodes media datasets from the Hub in worker threads, and `IterableDataset.decode()` replaces that threaded step when it finds it as the last step of the dataset (`MappedExamplesIterable.decoding_pool`).
`MappedExamplesIterable.shard_data_sources`, `shuffle_data_source... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8863 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8863/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8863/comments | https://api.github.com/repos/huggingface/datasets/issues/8863/events | https://github.com/huggingface/datasets/issues/8863 | 5,939,160,827 | I_kwDODunzps8AAAABYgBm-w | 8,863 | IterableDataset.decode(False) has no effect after shard() on a streamed media dataset | {
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Since #8791, `load_dataset(..., streaming=True)` decodes media datasets from the Hub in worker threads by default. `decode()` replaces that threaded decoding step when it is the last step of the dataset, but `shard()` loses track of it. After `ds.shard(...)`, `ds.decode(False)` keeps yielding deco... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8862 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8862/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8862/comments | https://api.github.com/repos/huggingface/datasets/issues/8862/events | https://github.com/huggingface/datasets/pull/8862 | 5,938,823,796 | PR_kwDODunzps8AAAABJg1jBQ | 8,862 | Close owned event loops and pending work in streaming async maps | {
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Track loop ownership per iterator, settle that iterat... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8861 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8861/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8861/comments | https://api.github.com/repos/huggingface/datasets/issues/8861/events | https://github.com/huggingface/datasets/pull/8861 | 5,938,747,991 | PR_kwDODunzps8AAAABJgxs4g | 8,861 | Embed nested undecoded media in Hub Parquet shards | {
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} | `Dataset.push_to_hub()` can upload path-only records for images or audio nested inside a struct, `List`, or `LargeList` when `decode=False`, even with `embed_external_files=True`. The resulting Parquet shards refer to files on the uploader's machine instead of containing their bytes.
Use the existing recursive `requir... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8860 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8860/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8860/comments | https://api.github.com/repos/huggingface/datasets/issues/8860/events | https://github.com/huggingface/datasets/pull/8860 | 5,938,641,082 | PR_kwDODunzps8AAAABJgsbSA | 8,860 | Fix HDF5 compound array field inference | {
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} | HDF5 compound records can contain numeric array fields, such as `np.dtype([("id", "int32"), ("values", "float32", (3,))])`. Loading this valid file currently raises `TypeError: 'NoneType' object is not iterable` during schema inference: the subarray dtype is mistaken for another compound record.
Keep the field dimensi... | null | {
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Concatenating the same disk-backed datasets using different axes gives the same fingerprint, even though the resulting datasets are different. As a result, calling `map()` on one can reuse the cached results of the other without warning.
In the example below, a dataset with two rows of paired tex... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8858 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8858/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8858/comments | https://api.github.com/repos/huggingface/datasets/issues/8858/events | https://github.com/huggingface/datasets/pull/8858 | 5,935,012,144 | PR_kwDODunzps8AAAABJd3NcQ | 8,858 | Fix inverted split slices reading the rest of the split | {
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} | A split slice whose end falls one row before its start returns the rest of the split instead of nothing:
```python
import pathlib, tempfile
from datasets import load_dataset
path = pathlib.Path(tempfile.mkdtemp()) / "data.csv"
path.write_text("x\n" + "\n".join(map(str, range(10))) + "\n")
print(list(load_dataset("csv... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8857 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8857/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8857/comments | https://api.github.com/repos/huggingface/datasets/issues/8857/events | https://github.com/huggingface/datasets/pull/8857 | 5,928,108,354 | PR_kwDODunzps8AAAABJYYojg | 8,857 | set dev 5.2.0 | {
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https://api.github.com/repos/huggingface/datasets/issues/8856 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8856/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8856/comments | https://api.github.com/repos/huggingface/datasets/issues/8856/events | https://github.com/huggingface/datasets/pull/8856 | 5,927,151,696 | PR_kwDODunzps8AAAABJXn3aA | 8,856 | Reject duplicate WebDataset fields instead of silently overwriting data | {
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This change raises `ValueError` before overwriting an existing field ... | {
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https://api.github.com/repos/huggingface/datasets/issues/8855 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8855/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8855/comments | https://api.github.com/repos/huggingface/datasets/issues/8855/events | https://github.com/huggingface/datasets/pull/8855 | 5,925,499,669 | PR_kwDODunzps8AAAABJWSn8A | 8,855 | Preserve active iterators when reconfiguring threaded decoding | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8855). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-10-19T14:12:56 | 2026-10-19T18:02:53 | 2026-10-19T18:02:53 | null | CONTRIBUTOR | [] | null | null | false | {
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https://api.github.com/repos/huggingface/datasets/issues/8854 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8854/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8854/comments | https://api.github.com/repos/huggingface/datasets/issues/8854/events | https://github.com/huggingface/datasets/pull/8854 | 5,919,837,554 | PR_kwDODunzps8AAAABJRu_8Q | 8,854 | Fix duplicated word in FileLock umask comment | {
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} | A one-word comment typo in `src/datasets/utils/_filelock.py`: the comment reads "In previous **previous** it was already using the current umask", duplicating a word and dropping the noun.
```diff
# The "mode" argument is required if we want to use the current umask in filelock >= 3.10
- # In previous ... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8853 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8853/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8853/comments | https://api.github.com/repos/huggingface/datasets/issues/8853/events | https://github.com/huggingface/datasets/pull/8853 | 5,918,203,410 | PR_kwDODunzps8AAAABJQbZvA | 8,853 | Drop a leading UTF-8 BOM in the conll loader | {
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} | ### What was wrong
`load_dataset("conll", ...)` keeps a leading UTF-8 BOM. Because the BOM sits at the very start of the first line, it also defeats the two line-level checks (`skip_docstart` and `comment_prefix`), which compare the beginning of a line, so the first marker/comment line is turned into a data row:
```p... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8852 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8852/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8852/comments | https://api.github.com/repos/huggingface/datasets/issues/8852/events | https://github.com/huggingface/datasets/pull/8852 | 5,918,068,071 | PR_kwDODunzps8AAAABJQUfIQ | 8,852 | Drop a leading UTF-8 BOM in the text loader | {
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} | ### What was wrong
`load_dataset("text", ...)` keeps a leading UTF-8 BOM as part of the data:
```python
import codecs
import os
import tempfile
from datasets import load_dataset
path = os.path.join(tempfile.mkdtemp(), "corpus.txt")
with open(path, "wb") as f:
f.write(codecs.BOM_UTF8 + b"hello\nworld\n")
print(... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8850 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8850/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8850/comments | https://api.github.com/repos/huggingface/datasets/issues/8850/events | https://github.com/huggingface/datasets/pull/8850 | 5,910,024,252 | PR_kwDODunzps8AAAABJKDDOg | 8,850 | Apply cast and cast_column below threaded decoding in IterableDataset | {
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} | Since #8791, streaming a media dataset from the Hub decodes it in worker threads by default, through the `map` step added by `IterableDataset.decode(num_threads=...)`. `cast` and `cast_column` only replaced `info.features` on top of that step, so they had no effect on decoding:
* `cast_column("audio", Audio(sampling_r... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8849 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8849/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8849/comments | https://api.github.com/repos/huggingface/datasets/issues/8849/events | https://github.com/huggingface/datasets/issues/8849 | 5,910,024,035 | I_kwDODunzps8AAAABYEPPYw | 8,849 | cast_column / cast are ignored on streaming datasets decoded in threads (audio sampling_rate, decode=False) | {
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... | [] | open | false | [] | null | [] | 2026-10-18T13:29:47 | 2026-10-18T13:29:47 | null | null | NONE | [] | null | null | null | null | ### Describe the bug
Since #8791, `load_dataset(..., streaming=True)` decodes media in worker threads by default when the dataset is on the Hub. The threaded decoding is a `map` step created by `IterableDataset.decode(num_threads=...)`, so the examples coming out of the dataset are already decoded.
`IterableDataset.c... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8848 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8848/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8848/comments | https://api.github.com/repos/huggingface/datasets/issues/8848/events | https://github.com/huggingface/datasets/pull/8848 | 5,907,459,842 | PR_kwDODunzps8AAAABJIFkzg | 8,848 | Read string_to_dict fields by group name instead of position | {
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} | `string_to_dict` turns every `{field}` in the pattern into a named group `(?P<_field>.+)` and then reads the match with `result.groups()`, which is positional. Any other capture group in the pattern shifts the values, so `string_to_dict("train/alice", "(train|test)/{name}")` returns `{'name': 'train'}` instead of `{'na... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8847 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8847/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8847/comments | https://api.github.com/repos/huggingface/datasets/issues/8847/events | https://github.com/huggingface/datasets/pull/8847 | 5,905,750,493 | PR_kwDODunzps8AAAABJGyEnQ | 8,847 | Hide GPUs before spawning TensorFlow data workers | {
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} | `to_tf_dataset(num_workers=...)` can import a user's collator and initialize TensorFlow before `worker_loop` hides its GPUs. Hide GPUs in the spawn environment so initialization already uses the CPU, then restore the parent environment. Fixes #6948.
Six new cases cover imported collators with eager TensorFlow initia... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8846 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8846/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8846/comments | https://api.github.com/repos/huggingface/datasets/issues/8846/events | https://github.com/huggingface/datasets/pull/8846 | 5,905,747,984 | PR_kwDODunzps8AAAABJGx8nQ | 8,846 | Restore packaged type information and public re-exports | {
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} | Restores packaged inline type information. The `py.typed` marker is included in the wheel and source archive and explicit aliases mark the existing public re exports. Annotating the `Features` constructor's variadic arguments as `Any` also lets ordinary dictionary inputs type check. Fixes #7390.
Checked an installed... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8845 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8845/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8845/comments | https://api.github.com/repos/huggingface/datasets/issues/8845/events | https://github.com/huggingface/datasets/pull/8845 | 5,905,745,577 | PR_kwDODunzps8AAAABJGx1Jw | 8,845 | Copy existing tensors without a PyTorch warning | {
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} | Streaming `with_format("torch").map(...)` warns for every row when a transform returns tensors. Copy existing tensors directly while keeping dtype/device overrides, independent storage and leaf gradient settings. Fixes #7088.
Added 18 regression cases, including batched maps. Formatting checks: 59 passed, 12 skipped... | null | {
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"I think the issue is that it's logged once per dataloader worker, maybe we should have `_is_main_process` from `IterableDataset` in examples iterables too"
] | 2026-10-18T02:57:43 | 2026-10-19T17:32:35 | null | null | CONTRIBUTOR | [] | null | null | false | {
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} | Repeated checkpoint restores can print the same shuffle-buffer warning thousands of times. This shows it once per process, including when several datasets are restored. Fixes #7444.
Added four cases covering repeated restores and initial checkpoints, with checks on the returned rows. The iterable suite has 655 passes ... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8843 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8843/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8843/comments | https://api.github.com/repos/huggingface/datasets/issues/8843/events | https://github.com/huggingface/datasets/pull/8843 | 5,905,519,061 | PR_kwDODunzps8AAAABJGmxQg | 8,843 | Fix mask resizing in the semantic segmentation guide | {
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} | The Torchvision example now resizes masks with nearest neighbor interpolation so it doesn't create new class labels. I also removed the old output image, which shows the incorrect mask boundaries. Fixes #6865.
Checked the updated example with upscaling and downscaling, for single examples and batches. Class labels a... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8842 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8842/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8842/comments | https://api.github.com/repos/huggingface/datasets/issues/8842/events | https://github.com/huggingface/datasets/pull/8842 | 5,905,464,748 | PR_kwDODunzps8AAAABJGkDSA | 8,842 | Include the config name when no data files are found | {
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} | When the first config in a README has no matching data files, the error now includes its name and the dataset path. This makes it easier to find the broken entry. Added tests for README and standalone YAML configs, Hub and bucket loaders and explicit file overrides.
Fixes #6819.
Tests: 302 local tests passed. lin... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8841 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8841/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8841/comments | https://api.github.com/repos/huggingface/datasets/issues/8841/events | https://github.com/huggingface/datasets/pull/8841 | 5,905,383,660 | PR_kwDODunzps8AAAABJGf6vQ | 8,841 | Handle UTF-8 BOMs in every JSON input file | {
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} | Follow up to #8243. Strip the UTF-8 BOM at the start of each JSON input file. Multifile loads with inferred or explicit `List(Json())` columns otherwise fail when a later file has a BOM.
Adds eight regression cases covering inferred/explicit features and regular/streaming loads, including multiple batches and BOM ch... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8840 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8840/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8840/comments | https://api.github.com/repos/huggingface/datasets/issues/8840/events | https://github.com/huggingface/datasets/pull/8840 | 5,905,312,433 | PR_kwDODunzps8AAAABJGcXiw | 8,840 | Fix indices buffer loading in Dataset.from_buffer | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8840). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-10-18T02:16:59 | 2026-10-19T17:53:36 | 2026-10-19T17:53:36 | null | CONTRIBUTOR | [] | null | null | false | {
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"merged_at": "2026-10-19T17:53... | `Dataset.from_buffer` reads the data buffer twice when `indices_buffer` is provided. this raises a type error for string columns and can silently return the wrong rows for uint64 data. Read the supplied indices buffer instead, with 8 regression cases covering empty, reordered and repeated indices, plus the no index cas... | {
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https://api.github.com/repos/huggingface/datasets/issues/8839 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8839/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8839/comments | https://api.github.com/repos/huggingface/datasets/issues/8839/events | https://github.com/huggingface/datasets/pull/8839 | 5,904,302,121 | PR_kwDODunzps8AAAABJFrhjA | 8,839 | Create the table before the workers append in to_sql with num_proc | {
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"Checked this against the race in #8838: running batch 0 in the parent before the pool starts means the table exists (with `if_exists` applied once) before any worker appends, and the empty-dataset and single-batch paths still behave. The test discriminates the right way too: the sleep on offset 0 only matters with... | 2026-10-17T23:42:13 | 2026-10-19T10:15:53 | null | null | NONE | [] | null | null | false | {
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} | `to_sql` with `num_proc > 1` hands every batch to the pool at once. The batch at offset 0 runs `DataFrame.to_sql` with `if_exists` as given (`"fail"` by default) and is meant to create the table; the later batches run with `if_exists="append"`, which also creates the table when it is missing. Whenever a later batch rea... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8838 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8838/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8838/comments | https://api.github.com/repos/huggingface/datasets/issues/8838/events | https://github.com/huggingface/datasets/issues/8838 | 5,904,301,750 | I_kwDODunzps8AAAABX-x-tg | 8,838 | to_sql with num_proc > 1 fails with 'table already exists' when a later batch reaches the database first | {
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`Dataset.to_sql(name, con, num_proc=N)` with more than one batch fails with `table already exists` (sqlite: `(sqlite3.OperationalError) table t already exists`, or pandas' `ValueError: Table 't' already exists.`), and whether it fails depends on which worker reaches the database first.
`SqlDatase... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8837 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8837/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8837/comments | https://api.github.com/repos/huggingface/datasets/issues/8837/events | https://github.com/huggingface/datasets/pull/8837 | 5,904,286,825 | PR_kwDODunzps8AAAABJFqyBw | 8,837 | Refuse an iterable of bools as a row index instead of reading it as indices 0 and 1 | {
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"The first version only looked at `dtype.kind`, so an object-dtype array of bools and a torch-style bool tensor still slipped through as rows 0 and 1. The check now covers those, Arrow boolean arrays, and `Dataset.select`, which had the same silent path for a numpy or Arrow mask. Each case has a test that fails on ... | 2026-10-17T23:39:59 | 2026-10-18T08:06:25 | null | null | NONE | [] | null | null | false | {
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} | `Dataset.__getitem__` reads a list, tuple, numpy array or pandas Series of booleans as row indices: `_query_table` turns the key into integers with `np.fromiter(key, np.int64)`, so a mask becomes the rows 0 and 1, and the result is silently wrong.
```python
>>> ds = Dataset.from_dict({"a": [10, 20, 30, 40, 50]})
>>> d... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8836 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8836/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8836/comments | https://api.github.com/repos/huggingface/datasets/issues/8836/events | https://github.com/huggingface/datasets/issues/8836 | 5,904,286,347 | I_kwDODunzps8AAAABX-xCiw | 8,836 | Indexing a Dataset with a list or array of bools silently returns rows 0 and 1 | {
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`Dataset.__getitem__` accepts a list, tuple, numpy array or pandas Series of booleans and reads it as integer row indices: every `True` becomes row 1 and every `False` row 0. No error is raised, and the result has the length of the mask, so it looks like a valid selection. The docstring says rows ... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8835 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8835/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8835/comments | https://api.github.com/repos/huggingface/datasets/issues/8835/events | https://github.com/huggingface/datasets/pull/8835 | 5,904,197,347 | PR_kwDODunzps8AAAABJFmVbQ | 8,835 | Write the encoding passed to to_csv | {
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"Two small follow-ups: an empty dataset wrote a two-byte UTF-16 byte order mark where main wrote nothing, so the encoder's final flush now runs only after a batch was written, and the test checks the raw bytes for exactly one mark instead of relying on the round trip alone. #8834 touches the same lines, so whicheve... | 2026-10-17T23:27:22 | 2026-10-19T11:23:29 | null | null | NONE | [] | null | null | false | {
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} | `Dataset.to_csv(path, encoding="utf-16")` wrote UTF-8. `CsvDatasetWriter._batch_csv` hands the batch to pandas with `path_or_buf=None`, so pandas returns a `str` and never applies `encoding`; the writer then encoded that `str` with a hard-coded `"utf-8"`. The docstring points at `pandas.DataFrame.to_csv` for the keywor... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8834 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8834/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8834/comments | https://api.github.com/repos/huggingface/datasets/issues/8834/events | https://github.com/huggingface/datasets/pull/8834 | 5,904,197,099 | PR_kwDODunzps8AAAABJFmUog | 8,834 | Number the index across batches in to_csv and to_sql | {
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"The RangeIndex renumbering is the right fix and covers both writers. One case worth a pin: a dataset that went through `select()` carries `_indices`, and `offset` is then a position inside the sliced view, so the written index numbers the slice 0..len rather than the original rows. That matches the natural \"row n... | 2026-10-17T23:27:20 | 2026-10-19T08:02:54 | null | null | NONE | [] | null | null | false | {
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} | `to_csv(index=True)` and `to_sql(index=True)` wrote an index column that restarts at 0 in every batch: `CsvDatasetWriter._batch_csv` and `SqlDatasetWriter._batch_sql` convert each batch with `batch.to_pandas()`, which gives the batch a fresh `RangeIndex` from 0, and pandas writes that. With the default `batch_size` the... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8833 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8833/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8833/comments | https://api.github.com/repos/huggingface/datasets/issues/8833/events | https://github.com/huggingface/datasets/pull/8833 | 5,904,196,838 | PR_kwDODunzps8AAAABJFmT0A | 8,833 | Cast dictionary-encoded storage such as pandas Categorical columns in ClassLabel | {
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"A second look at my own change turned up a regression: the first version sent every non-integer dictionary down the label-name path, so a float dictionary that `array_cast` converted on main started raising. The name path is now gated on a string value type and a test pins the float case. I also noted #8688 in the... | 2026-10-17T23:27:18 | 2026-10-19T11:23:27 | null | null | NONE | [] | null | null | false | {
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} | `ClassLabel.cast_storage` handles `pa.StringArray` and `pa.IntegerArray` and hands anything else to `array_cast(storage, int64)`. A pandas `Categorical` column arrives as a `pa.DictionaryArray` (`dictionary<values=large_string, indices=int8>`), so Arrow tries to parse the category names as integers:
```
ArrowInvalid: ... | null | {
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