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When `load_dataset()` falls back to the local cache, for example when offline or when the Hub is unreachable, it ignores the `revision` argument and simply returns the most recently modified cached version. This can lead to unexpected behavior when a specific revision is requested.
This happens becaus... | null | {
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} | Summary
- expand `~` before classifying local `data_files` patterns
- add a regression test covering `resolve_pattern(os.path.join("~", ...), ...)`
Impact
- `load_dataset(..., data_files="~/path/to/file.parquet")` currently treats `~` as a literal relative directory under the working tree instead of the user's home di... | null | {
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kinda related: https://github.com/huggingface/datasets/issues/5717 | {
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Modify the dataset loading initialization, so that fsspec filesystem instances (like GCSFileSystem or S3FileSystem) are instantiated once in the main thread and explicitly passed down to the background threads.
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} | # Add Apache Iceberg format support
## Motivation
Apache Iceberg is the most widely adopted open table format for data lakes, supported by Databricks,
Snowflake, AWS Glue, Dremio, and others. A large amount of ML training data lives in Iceberg tables.
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8147). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.",
"I took the liberty of adjusting the fix to still use the iter_arrow in `FormattedExampl... | 2026-04-23T00:03:14 | 2026-04-25T06:54:22 | null | null | CONTRIBUTOR | [] | null | null | false | {
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Fixes: https://github.com/huggingface/datasets/issues/8145
## Root Cause
`FormattedExamplesIterable.__iter__` ignored `force_convert_to_python` and used Arrow batch iteration, advancing the
underlying state by a full Arrow chunk before yielding Python examples.
## Fix
Only use Arrow batch iteration whe... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8146 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8146/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8146/comments | https://api.github.com/repos/huggingface/datasets/issues/8146/events | https://github.com/huggingface/datasets/pull/8146 | 4,309,397,635 | PR_kwDODunzps7UpCh7 | 8,146 | fix: tolerate chmod PermissionError on flat-permission filesystems | {
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} | ## Summary
Fixes #8125.
`Dataset.map()` (and the indices writer in `Dataset.flatten_indices` / `Dataset.select` path) calls `os.chmod(cache_file, 0o666 & ~umask)` on the freshly moved cache file. On flat-permission filesystems — GCS FUSE, S3 FUSE mounts, and similar object-storage-backed mounts — `chmod` raises `Perm... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8145 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8145/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8145/comments | https://api.github.com/repos/huggingface/datasets/issues/8145/events | https://github.com/huggingface/datasets/issues/8145 | 4,306,478,911 | I_kwDODunzps8AAAABAK-nPw | 8,145 | `.map()` on a streaming IterableDataset silently skips examples after load_state_dict | {
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After `ds.map(fn)` on a streaming IterableDataset, saving state_dict() and loading it into a fresh dataset does not resume at the correct position. It jumps forward by up to one Arrow read-chunk (~1000 rows).
### Steps to reproduce the bug
```python
from datasets import Dataset
ds1 = Dataset.fr... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8144 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8144/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8144/comments | https://api.github.com/repos/huggingface/datasets/issues/8144/events | https://github.com/huggingface/datasets/pull/8144 | 4,300,950,373 | PR_kwDODunzps7UNskE | 8,144 | Add Apache TsFile packaged module and Time Series docs category | {
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} | ## What does this PR do?
Adds first-class support for the [Apache TsFile](https://tsfile.apache.org/)
columnar time-series format (used by [Apache IoTDB](https://iotdb.apache.org/)
and other time-series systems) to 🤗 Datasets, and surfaces time-series
datasets as a dedicated modality in the documentation sidebar... | {
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https://api.github.com/repos/huggingface/datasets/issues/8143 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8143/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8143/comments | https://api.github.com/repos/huggingface/datasets/issues/8143/events | https://github.com/huggingface/datasets/pull/8143 | 4,296,535,961 | PR_kwDODunzps7T_YeI | 8,143 | tag openclaw sessions via cwd in pi agent traces | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8143). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-04-20T14:45:50 | 2026-04-21T09:02:10 | 2026-04-21T09:02:08 | null | CONTRIBUTOR | [] | null | null | false | {
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https://api.github.com/repos/huggingface/datasets/issues/8142 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8142/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8142/comments | https://api.github.com/repos/huggingface/datasets/issues/8142/events | https://github.com/huggingface/datasets/pull/8142 | 4,292,299,784 | PR_kwDODunzps7Txzfw | 8,142 | fix: replace list with Sequence in public API type hints | {
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} | Fixes #5354
Replaced `list` with `Sequence` in public API function signatures across:
- `arrow_dataset.py` — from_csv, from_json, from_parquet, from_text
- `iterable_dataset.py` — from_csv, from_json, from_parquet, from_text
- `combine.py` — interleave_datasets, concatenate_datasets
- `dataset_dict.py` — remov... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8141 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8141/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8141/comments | https://api.github.com/repos/huggingface/datasets/issues/8141/events | https://github.com/huggingface/datasets/pull/8141 | 4,280,918,239 | PR_kwDODunzps7TOjAR | 8,141 | Fix Image feature to dynamically select pyarrow storage type for large binary/string inputs | {
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"Hi ! if the goal to fix the linked issue maybe we can find a simpler approach.\r\n\r\nWhile your PR seems to solve it, it needs extra careful attention to not add regressions for image datasets, in particular when it comes to data with mixes of both binary and large_binary\r\n\r\ne.g.\r\n- concatenating image data... | 2026-04-17T07:28:01 | 2026-04-17T13:52:35 | null | null | NONE | [] | null | null | true | {
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} | Add dynamic pyarrow storage type selection to the Image feature so that pa.large_binary() and pa.large_string() inputs are preserved natively instead of being cast down to pa.binary() / pa.string()
Introduce _get_target_pa_type() to detect large types from incoming storage and _to_struct_storage() to build struct arra... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8140 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8140/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8140/comments | https://api.github.com/repos/huggingface/datasets/issues/8140/events | https://github.com/huggingface/datasets/pull/8140 | 4,276,066,629 | PR_kwDODunzps7S-0aR | 8,140 | fix warning in ci | {
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"merged_at": "2026-04-16T13:35... | otherwise it raises an issue from transformers smh
```
../../.pyenv/versions/3.12.2/envs/hf-datasets/lib/python3.12/site-packages/transformers/__init__.py:843: in _getattr
return getattr(importlib.import_module(target, __name__), new_name)
../../.pyenv/versions/3.12.2/lib/python3.12/importlib/__init__.py:90: ... | {
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https://api.github.com/repos/huggingface/datasets/issues/8139 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8139/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8139/comments | https://api.github.com/repos/huggingface/datasets/issues/8139/events | https://github.com/huggingface/datasets/pull/8139 | 4,275,963,570 | PR_kwDODunzps7S-fAg | 8,139 | update ci uer | {
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https://api.github.com/repos/huggingface/datasets/issues/8138 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8138/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8138/comments | https://api.github.com/repos/huggingface/datasets/issues/8138/events | https://github.com/huggingface/datasets/pull/8138 | 4,275,574,837 | PR_kwDODunzps7S9OiA | 8,138 | chore: bump doc-builder SHA for main doc build workflow | {
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"Closing — not needed right now, active libs already on @main."
] | 2026-04-16T12:03:28 | 2026-04-17T09:16:40 | 2026-04-17T09:16:39 | null | CONTRIBUTOR | [] | null | null | true | {
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} | Bump the pinned doc-builder SHA so that main documentation builds also sync to the HF bucket (dual-write).
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https://api.github.com/repos/huggingface/datasets/issues/8137 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8137/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8137/comments | https://api.github.com/repos/huggingface/datasets/issues/8137/events | https://github.com/huggingface/datasets/pull/8137 | 4,275,524,898 | PR_kwDODunzps7S9ENL | 8,137 | Fix: decode JSON type before to_list or to_dict is called | {
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"@lhoestq Could this be reviewed and merged if it's a suitable solution?"
] | 2026-04-16T11:54:09 | 2026-04-27T06:18:02 | null | null | NONE | [] | null | null | false | {
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} | **Motivation**:
There is a change in the approach to decoding JSON types, added in https://github.com/huggingface/datasets/commit/d560b58e1f1ec96591a95a1780ee118f5eea6c74. Since 4.7.0, to_list() returns raw JSON strings for columns stored as Json(), while direct access via getitem returns dicts.
In versions prior t... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8136 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8136/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8136/comments | https://api.github.com/repos/huggingface/datasets/issues/8136/events | https://github.com/huggingface/datasets/pull/8136 | 4,272,360,448 | PR_kwDODunzps7Sz4Iz | 8,136 | Remove print statement in JSON processing | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8136). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-04-15T23:42:21 | 2026-04-15T23:45:23 | 2026-04-15T23:43:16 | null | MEMBER | [] | null | null | false | {
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https://api.github.com/repos/huggingface/datasets/issues/8135 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8135/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8135/comments | https://api.github.com/repos/huggingface/datasets/issues/8135/events | https://github.com/huggingface/datasets/pull/8135 | 4,268,369,489 | PR_kwDODunzps7Sm752 | 8,135 | Add Zarr / OME-Zarr Dataset Support | {
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"How does this PR related to the existing one at https://github.com/huggingface/datasets/pull/7983 ?\r\nThey could be complementary, maybe it's worth checking how we can take the best of both PRs ?",
"Hi @lhoestq, thanks for your reply. \r\n\r\nMy understanding is that #7983 models a **Zarr store as a dataset**: ... | 2026-04-15T10:57:18 | 2026-04-16T11:31:31 | null | null | NONE | [] | null | null | false | {
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} | # Add Zarr / OME-Zarr Dataset Support
## TL;DR
This PR adds support for Zarr-backed datasets to `datasets`, with a focus on lazy, streaming-friendly access to large multidimensional arrays. It introduces a new `Zarr` feature, lazy proxy objects for arrays, groups, and OME-Zarr multiscale images, a `zarrfolder` pa... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8134 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8134/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8134/comments | https://api.github.com/repos/huggingface/datasets/issues/8134/events | https://github.com/huggingface/datasets/pull/8134 | 4,267,351,322 | PR_kwDODunzps7SkBKa | 8,134 | chore: bump doc-builder SHA for PR upload workflow | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8134). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-04-15T08:19:11 | 2026-04-15T10:15:12 | 2026-04-15T10:15:10 | null | CONTRIBUTOR | [] | null | null | false | {
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https://api.github.com/repos/huggingface/datasets/issues/8133 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8133/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8133/comments | https://api.github.com/repos/huggingface/datasets/issues/8133/events | https://github.com/huggingface/datasets/pull/8133 | 4,264,953,406 | PR_kwDODunzps7Sczz9 | 8,133 | use full repo-relative file path instead of filename for agent traces | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8133). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.",
"thanks ! let me push some adjustments, and yea let's use file_path instead"
] | 2026-04-14T21:56:43 | 2026-04-15T11:18:56 | 2026-04-15T11:18:54 | null | CONTRIBUTOR | [] | null | null | false | {
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"merged_at": "2026-04-15T11:18... | We want to include full path of the file so it's easier to fetch the full trace from repo
- Store the full repo-relative path in `file_name` instead of just the basename
- Extracts the path from the `hf://` origin URL set by the download manager
Before: `file_name = "614b8d50-097f-4e36-aee0-1fdd053335e7.js... | {
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https://api.github.com/repos/huggingface/datasets/issues/8132 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8132/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8132/comments | https://api.github.com/repos/huggingface/datasets/issues/8132/events | https://github.com/huggingface/datasets/pull/8132 | 4,260,846,283 | PR_kwDODunzps7SPyRm | 8,132 | fix(Dataset.map): initialize writer on first non-None output instead of first index | {
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} | ## What does this PR do?
Fixes #7990
## The Bug
When a map function returns `None` for the first examples and a dict for
later ones, `Dataset.map()` crashes with:
AttributeError: 'NoneType' object has no attribute 'write'
This happens because the ArrowWriter was initialized only when processing
ind... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8131 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8131/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8131/comments | https://api.github.com/repos/huggingface/datasets/issues/8131/events | https://github.com/huggingface/datasets/issues/8131 | 4,251,712,550 | I_kwDODunzps79a_wm | 8,131 | datasets.to_list: Behaviour change in version 4.7.0 with the addition of JSON type | {
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"I think we can go for the same approach as in https://github.com/huggingface/datasets/pull/8122 which decodes the JSON data (and supports JSON nested in other objects)\n\n(Or decide to decode all the features types, which I think could make sense, but this needs more careful handling so this should be discussed in... | 2026-04-13T06:06:43 | 2026-04-21T17:28:52 | null | null | NONE | [] | null | null | null | null | ### Describe the bug
There is a change in the approach to decoding JSON types, added in https://github.com/huggingface/datasets/commit/d560b58e1f1ec96591a95a1780ee118f5eea6c74. Since 4.7.0, to_list() returns raw JSON strings for columns stored as Json(), while direct access via __getitem__ returns dicts.
In versions... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8130 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8130/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8130/comments | https://api.github.com/repos/huggingface/datasets/issues/8130/events | https://github.com/huggingface/datasets/pull/8130 | 4,243,231,129 | PR_kwDODunzps7RoV2k | 8,130 | fix: mutable default argument in `_visit_with_path` | {
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} | Replace `visit_path: _VisitPath = []` with `Optional[_VisitPath] = None` to avoid the mutable default argument anti-pattern ([B006](https://docs.astral.sh/ruff/rules/mutable-argument-default/)).
While the current callers always use `visit_path + [k]` (creating new lists), the shared default list is a latent bug that w... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8129 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8129/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8129/comments | https://api.github.com/repos/huggingface/datasets/issues/8129/events | https://github.com/huggingface/datasets/issues/8129 | 4,241,704,875 | I_kwDODunzps7800er | 8,129 | `load_dataset()` hangs when `hf_xet` is enabled | {
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"Apologies, seems to have been a stale cache issue. Nuking the datasets cache fixed the issue"
] | 2026-04-10T21:00:24 | 2026-04-10T21:07:56 | 2026-04-10T21:07:56 | null | MEMBER | [] | null | null | null | null | ### Describe the bug
Hi! I am getting a peculiar download issue on the latest versions of `datasets` and `hfh` where datasets hang indefinitely:
```py
from datasets import load_dataset
load_dataset("openai/gsm8k", "main", split="test")
```
Note that:
- streaming=True works.
- Direct Hub access works.
- Th... | {
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https://api.github.com/repos/huggingface/datasets/issues/8128 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8128/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8128/comments | https://api.github.com/repos/huggingface/datasets/issues/8128/events | https://github.com/huggingface/datasets/pull/8128 | 4,240,118,144 | PR_kwDODunzps7RfgVx | 8,128 | Don't include files list DatasetInfo (and remove old stuff) | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8128). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-04-10T15:30:24 | 2026-04-16T09:23:48 | 2026-04-16T09:23:45 | null | MEMBER | [] | null | null | false | {
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"merged_at": "2026-04-16T09:23... | this will fix the viewer when it saves the dataset info in mongo, for datasets with a lot of files this can make the mongo doc too big for mongo
I also removed old deprecated stuff linked to files list like the old concept of "post-processing" and cleaned the checksum recording logic | {
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https://api.github.com/repos/huggingface/datasets/issues/8127 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8127/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8127/comments | https://api.github.com/repos/huggingface/datasets/issues/8127/events | https://github.com/huggingface/datasets/pull/8127 | 4,225,755,698 | PR_kwDODunzps7Q23En | 8,127 | Support explicit harness field in agent traces | {
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"For a concrete example, [https://huggingface.co/datasets/jedisct1/agent-traces-swival](https://huggingface.co/datasets/jedisct1/agent-traces-swival) currently shows `claude_code` because it shares field names with Claude Code, despite an explicit `harness` field identifying the harness as not Claude Code.\r\n",
... | 2026-04-08T15:39:48 | 2026-04-23T16:47:46 | 2026-04-23T16:47:46 | null | NONE | [] | null | null | false | {
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} | Hi!
This small PR allows an optional `harness` field to be parsed.
When present, the harness field takes priority over type-value heuristics.
This allows agents to self-identify even when they contain property names that collide with an existing harness ("session", "system", etc.) | {
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https://api.github.com/repos/huggingface/datasets/issues/8126 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8126/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8126/comments | https://api.github.com/repos/huggingface/datasets/issues/8126/events | https://github.com/huggingface/datasets/pull/8126 | 4,224,718,927 | PR_kwDODunzps7Qz_UY | 8,126 | Fix batching for table-formatted datasets | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8126). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-04-08T13:05:36 | 2026-04-10T13:14:01 | 2026-04-10T13:14:00 | null | CONTRIBUTOR | [] | null | null | false | {
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"merged_at": "2026-04-10T13:14... | ## Summary
Fix #8075
Fix `.batch()` on table-formatted `Dataset` and `IterableDataset`.
Before this change, calling `.batch()` on datasets formatted as `pyarrow`, `pandas`, or `polars` could fail because the batching path assumed dict-like inputs. This updates batching to use an Arrow-based path for table-style ... | {
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https://api.github.com/repos/huggingface/datasets/issues/8125 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8125/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8125/comments | https://api.github.com/repos/huggingface/datasets/issues/8125/events | https://github.com/huggingface/datasets/issues/8125 | 4,223,104,906 | I_kwDODunzps77t3eK | 8,125 | Feature request: being able to disable chmod for flat permission filesystems | {
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"Context: the operation fails on GCS FUSE mounts, and likely will on similar s3-backed file systems.\n\n File \"/home/user/.venv/lib/python3.12/site-packages/datasets/arrow_dataset.py\", line 3747, in _map_single ... | 2026-04-08T08:17:14 | 2026-04-08T08:22:42 | null | null | NONE | [] | null | null | null | null | ### Feature request
For flat permission file systems, `os.chmod` simply fails when trying to cache datasets - in some places such as: https://github.com/huggingface/datasets/blob/main/src/datasets/arrow_dataset.py#L4043-L4048 for arrow datasets.
This seems to be optional to obtained desired behavior as simply comment... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8122 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8122/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8122/comments | https://api.github.com/repos/huggingface/datasets/issues/8122/events | https://github.com/huggingface/datasets/pull/8122 | 4,206,043,598 | PR_kwDODunzps7P_9lo | 8,122 | fix: decode Json() values before calling DataFrame.to_json() (#8116) | {
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"Just committed the fix, please let me know if there are any other issues",
"Thanks for the quick fix!",
"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8122). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after ... | 2026-04-04T23:54:37 | 2026-04-10T13:12:48 | 2026-04-10T13:12:48 | null | CONTRIBUTOR | [] | null | null | false | {
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"merged_at": "2026-04-10T13:12... | # Summary
fixes (https://github.com/huggingface/datasets/issues/8116)
Basically the issue is that if a dataset column uses Json() as a feature type, calling to_json() on that dataset causes a raw json escaped string to be exported, without decoding it first.
### root cause
`to_json` exports feature values in their... | {
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https://api.github.com/repos/huggingface/datasets/issues/8121 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8121/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8121/comments | https://api.github.com/repos/huggingface/datasets/issues/8121/events | https://github.com/huggingface/datasets/pull/8121 | 4,204,840,969 | PR_kwDODunzps7P9H7w | 8,121 | Fix Audio.cast_storage for CSV-loaded large_string columns | {
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"Thanks for the investigation and the fix ! This makes me think that maybe load_dataset(\"csv\") should return \"string\" types instead of \"large_string\" to be consistent with load_dataset(\"json\") as well as the Dataset.from_xxx methods",
"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/d... | 2026-04-04T12:44:03 | 2026-04-10T21:29:05 | null | null | NONE | [] | null | null | false | {
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} | ## Summary
This PR fixes `Audio.cast_storage()` so that audio path columns loaded as `large_string` can be cast to `Audio()` correctly.
## Motivation
`Dataset.from_dict({"audio": [...]})` produces a `string` column and `cast_column("audio", Audio())` works, but `load_dataset("csv", ...)` produces a `large_string` ... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8120 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8120/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8120/comments | https://api.github.com/repos/huggingface/datasets/issues/8120/events | https://github.com/huggingface/datasets/issues/8120 | 4,201,197,701 | I_kwDODunzps76aTCF | 8,120 | Patch fields truncated — missing trailing newlines | {
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"Hi, I'd like to work on this issue. I'll try to reproduce this issue and see where the newline is being stripped.",
"Hi @hetao-git\n\nI was able to reproduce this issue, I used the instance \"atlanhq_atlan-python_pr37\" from the AweAI-Team/Scale-SWE dataset. I observed that applying the GitHub patch (pull/37.dif... | 2026-04-03T16:07:47 | 2026-04-22T12:36:28 | null | null | NONE | [] | null | null | null | null | Description: Multiple entries in the dataset have patches (test.patch and fix.patch) and f2p_patch fields with truncated content. The trailing blank lines that are part of valid unified diff format are stripped, causing git apply to fail with "corrupt patch" errors.
Affected instances (confirmed): atlanhq_atlan-python... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8116 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8116/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8116/comments | https://api.github.com/repos/huggingface/datasets/issues/8116/events | https://github.com/huggingface/datasets/issues/8116 | 4,197,189,620 | I_kwDODunzps76LAf0 | 8,116 | `to_json()` serializes `Json()` feature as escaped string instead of native JSON object | {
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"Hi! I ran into this issue as well, I think the root cause was that under `_batch_json()` of `JsonDatasetWriter` it was directly exporting the encoded string without decoding it first. I will try to add a PR with a small fix. ",
"#self-assign"
] | 2026-04-02T21:59:15 | 2026-04-10T13:12:51 | 2026-04-10T13:12:51 | null | CONTRIBUTOR | [] | null | null | null | null | ### Describe the bug
When a dataset column uses the `Json()` feature type, calling `to_json()` writes the value as an escaped JSON string (e.g., `"{\"cat_a\":1,\"cat_b\":2}"`) instead of a native JSON object (e.g., `{"cat_a":1,"cat_b":2}`).
This causes two problems:
1. The output JSON file is not interoperable with ... | {
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https://api.github.com/repos/huggingface/datasets/issues/8115 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8115/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8115/comments | https://api.github.com/repos/huggingface/datasets/issues/8115/events | https://github.com/huggingface/datasets/pull/8115 | 4,195,114,404 | PR_kwDODunzps7PldtS | 8,115 | fix: preserve features in IterableDataset.add_column (fixes #5752) | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8115). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-04-02T14:48:19 | 2026-04-07T14:19:35 | null | null | NONE | [] | null | null | false | {
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} | ## Summary
Fixes #5752.
`IterableDataset.add_column()` lost the dataset's feature schema on every call because it delegated to `map()` without passing the `features` argument. `map()` unconditionally writes `info.features = features`, so the default `None` silently overwrote the existing schema.
**Root cause** (`ite... | null | {
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