url string | repository_url string | labels_url string | comments_url string | events_url string | html_url string | id int64 | node_id string | number int64 | title string | user dict | labels list | state string | locked bool | assignees list | milestone null | comments list | created_at timestamp[s] | updated_at timestamp[s] | closed_at timestamp[s] | assignee dict | author_association string | issue_field_values list | type null | active_lock_reason null | draft bool | pull_request dict | body string | closed_by dict | reactions dict | timeline_url string | performed_via_github_app null | state_reason string | sub_issues_summary dict | issue_dependencies_summary dict | pinned_comment null | is_pull_request bool |
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https://api.github.com/repos/huggingface/datasets/issues/8170 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8170/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8170/comments | https://api.github.com/repos/huggingface/datasets/issues/8170/events | https://github.com/huggingface/datasets/pull/8170 | 4,372,102,391 | PR_kwDODunzps7XySvZ | 8,170 | fix(map): fix progress bar exceeding total when load_from_cache_file=False | {
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} | ## Summary
When `load_from_cache_file=False`, the progress bar in `Dataset.map()` displayed a count that exceeded the dataset size (e.g. "800 examples" for a 400-row dataset).
The bug: `pbar_initial` was computed using `len(existing_cache_files)`, which counts cache files on disk regardless of whether they would... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8169 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8169/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8169/comments | https://api.github.com/repos/huggingface/datasets/issues/8169/events | https://github.com/huggingface/datasets/issues/8169 | 4,366,520,018 | I_kwDODunzps8AAAABBEPO0g | 8,169 | Streaming dataset hangs consistently | {
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"+1 also encountered"
] | 2026-05-01T20:27:58 | 2026-05-01T23:51:13 | null | null | NONE | [] | null | null | null | null | ### Describe the bug
When loading a dataset with `streaming=True`, some background process prevents the script from ever returning (or at least for a very long time).
This did not happen with `huggingface-hub < 1`.
### Steps to reproduce the bug
from datasets import load_dataset
ds = load_dataset("IRIIS-RESEARCH/N... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8168 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8168/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8168/comments | https://api.github.com/repos/huggingface/datasets/issues/8168/events | https://github.com/huggingface/datasets/pull/8168 | 4,363,768,223 | PR_kwDODunzps7XYxf3 | 8,168 | docs(map): clarify that fn_kwargs yields a stable cache fingerprint vs closures | {
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} | ## Summary
When `Dataset.map()` or `Dataset.filter()` receives a closure that closes over an object containing non-deterministic state — for example a UUID, a random seed, or any mutable attribute of a class instance — `dill` serialises the **entire** captured object into the fingerprint. Two calls that are logically... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8167 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8167/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8167/comments | https://api.github.com/repos/huggingface/datasets/issues/8167/events | https://github.com/huggingface/datasets/issues/8167 | 4,356,674,999 | I_kwDODunzps8AAAABA62Vtw | 8,167 | [BUG] Abnormal progress bar in dataset.map when load_from_cache_file=False | {
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"https://github.com/huggingface/datasets/blob/4e3bf52ff436d841e61211dfa096b5c47197ae36/src/datasets/arrow_dataset.py#L3593-L3598",
"Hi, can you provide more details on the issue ?",
"<img width=\"340\" height=\"26\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/0dca6f47-4a8d-4871-a908-f58df856e... | 2026-04-30T08:47:53 | 2026-05-03T14:53:30 | null | null | NONE | [] | null | null | null | null | ### Describe the bug
datasets 4.8.5
```python
from datasets import load_dataset, load_from_disk
data = load_from_disk('pretrain_cached_dataset/train')
def dummy_map(example):
return example
dataset = data.map(dummy_map)
dataset = data.map(dummy_map, load_from_cache_file=True) ... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8166 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8166/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8166/comments | https://api.github.com/repos/huggingface/datasets/issues/8166/events | https://github.com/huggingface/datasets/pull/8166 | 4,354,922,713 | PR_kwDODunzps7W8BUa | 8,166 | Fix storage_options lookup for streaming Lance datasets | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8166). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.",
"CI failure is unrelated, merging"
] | 2026-04-30T02:34:57 | 2026-04-30T15:46:44 | 2026-04-30T15:38:42 | null | CONTRIBUTOR | [] | null | null | false | {
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"merged_at": "2026-04-30T15:38... | In `Lance._split_generators`, the `storage_options` lookup used `files[0].split("://", 0)[0] + "://"`, which has two bugs that compound: `split("://", 0)` does not split at all (maxsplit=0), and the `storage_options` dict is keyed by the bare scheme (`"hf"`), not `"hf://"`. The lookup therefore always returned `None`, ... | {
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https://api.github.com/repos/huggingface/datasets/issues/8165 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8165/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8165/comments | https://api.github.com/repos/huggingface/datasets/issues/8165/events | https://github.com/huggingface/datasets/issues/8165 | 4,354,878,889 | I_kwDODunzps8AAAABA5ItqQ | 8,165 | IterableDataset: corrupted EXIF image silently terminates streaming iterator instead of skipping the sample | {
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"Hi ! Would it be acceptable to return None instead of skipping ? This way we can provide the same API for non-streaming (since the length of the dataset is known in advance and fixed). Then a subsequent .filter call can take care of skipping the samples. Something like this maybe ?\n\n```python\nds = load_dataset(... | 2026-04-30T02:20:54 | 2026-05-02T02:19:38 | null | null | NONE | [] | null | null | null | null | ## Summary
When iterating over a streaming `IterableDataset` that contains images with corrupted EXIF metadata (e.g., a TIFF rational tag with denominator=0), PIL raises `ZeroDivisionError` inside `exif_transpose`. This exception propagates through the HuggingFace `datasets` pipeline and **terminates the streaming ite... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8164 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8164/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8164/comments | https://api.github.com/repos/huggingface/datasets/issues/8164/events | https://github.com/huggingface/datasets/issues/8164 | 4,354,825,277 | I_kwDODunzps8AAAABA5FcPQ | 8,164 | Lance: HF auth token dropped for private repos in streaming mode (broken `storage_options` lookup) | {
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"I can see the fix. Changing `split(\"://\", 0)` to `split(\"://\", 1)` and removing the `+ \"://\"` suffix. The key lookup should be `\"hf\"` not `\"hf://\"`. \nI'd like to submit a PR for this. Is this still open?",
"Well, I am already writing a PR for this, and it is just about to be submitted."
] | 2026-04-30T02:03:33 | 2026-04-30T15:38:43 | 2026-04-30T15:38:43 | null | CONTRIBUTOR | [] | null | null | null | null | ### Describe the bug
When `Lance._split_generators` receives `hf://` URIs - i.e. anywhere a `StreamingDownloadManager` is in play (`load_dataset(..., streaming=True)`, `get_dataset_split_names`, and the dataset-viewer worker) - the HF auth token is silently dropped before reaching `lance.dataset(...)`. Lance then atte... | {
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https://api.github.com/repos/huggingface/datasets/issues/8163 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8163/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8163/comments | https://api.github.com/repos/huggingface/datasets/issues/8163/events | https://github.com/huggingface/datasets/pull/8163 | 4,354,227,818 | PR_kwDODunzps7W5yDg | 8,163 | add agent trace prompt, sent_at, count fields | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8163). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-04-29T23:13:58 | 2026-05-01T19:53:45 | null | null | CONTRIBUTOR | [] | null | null | false | {
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} | - add agent trace metadata columns: `prompt`, `sent_at`, `num_user_messages`, and `num_tool_calls`.
- extract `prompt` / `sent_at` from the first real user message for Claude Code, Pi/OpenClaw, and Codex traces.
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https://api.github.com/repos/huggingface/datasets/issues/8162 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8162/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8162/comments | https://api.github.com/repos/huggingface/datasets/issues/8162/events | https://github.com/huggingface/datasets/pull/8162 | 4,353,153,600 | PR_kwDODunzps7W2QFE | 8,162 | Include all test files in sdist via MANIFEST.in | {
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} | Fixes #8159.
## What's wrong
The sdist on PyPI for `datasets==4.8.5` only ships **37 of the 95** files under `tests/`. Without an explicit `MANIFEST.in`, setuptools' default sdist behavior includes only top-level `tests/test_*.py` files and drops everything else.
Files missing from the current sdist:
- `tests/conft... | null | {
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https://api.github.com/repos/huggingface/datasets/issues/8161 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8161/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8161/comments | https://api.github.com/repos/huggingface/datasets/issues/8161/events | https://github.com/huggingface/datasets/pull/8161 | 4,351,184,502 | PR_kwDODunzps7WvuJb | 8,161 | Pass library_name/version to HfApi in dataset push and delete paths | {
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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8161). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
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https://api.github.com/repos/huggingface/datasets/issues/8160 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/8160/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/8160/comments | https://api.github.com/repos/huggingface/datasets/issues/8160/events | https://github.com/huggingface/datasets/pull/8160 | 4,349,215,301 | PR_kwDODunzps7WpIIx | 8,160 | feat: add TsFile (Apache IoTDB) packaged builder with per-device wide format | {
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"Hi team 👋\n\nA bit of background on me: I'm a PMC member of both [Apache TsFile](https://tsfile.apache.org/) and [Apache IoTDB](https://iotdb.apache.org/), and one of the core contributors to the TsFile format specification and its Python SDK ([`tsfile` on PyPI](https://pypi.org/project/tsfile/)). I've been worki... | 2026-04-29T09:07:25 | 2026-04-29T10:23:04 | null | null | NONE | [] | null | null | false | {
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} | Closes #7922
## Summary
Add a packaged builder for [TsFile](https://tsfile.apache.org/) — the columnar time-series file format used as the native storage layer of [Apache IoTDB](https://iotdb.apache.org/). This enables `load_dataset("tsfile", data_files="...")` with automatic `.tsfile` extension detection.
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"Hey, ran into something similar a while back when we were packaging a custom dataset loader for a client at v4.7.x. Turns out, PyPI distributions sometimes skip test files and fixtures like `conftest.py` since they're not critical for runtime—honestly, it's a packaging config thing in `setup.py` or `pyproject.toml... | 2026-04-28T20:01:05 | 2026-04-30T14:40:23 | null | null | NONE | [] | null | null | null | null | ### Describe the bug
Version: 4.8.5
### Steps to reproduce the bug
n/a
### Expected behavior
n/a
### Environment info
n/a | null | {
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} | Fixes #7928
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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"Is it open for contribution?",
"I think arbitrary filesystems would be recreated in every thread in any case, unlike HfFileSystem which has custom code to handle this."
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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.
By pre-instantiating the fs object in the main thread (where the directory cache from g... | null | {
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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.
Currently, users must manually export Iceberg data t... | null | {
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"I took the liberty of adjusting the fix to still use the iter_arrow in `FormattedExampl... | 2026-04-23T00:03:14 | 2026-04-27T14:03:27 | 2026-04-27T14:03:26 | 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... | {
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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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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... | {
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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
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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 | 2026-04-28T12:32:43 | 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... | {
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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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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8140). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
] | 2026-04-16T13:35:06 | 2026-04-16T13:40:09 | 2026-04-16T13:35:19 | null | MEMBER | [] | null | null | false | {
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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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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8139). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update."
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https://api.github.com/repos/huggingface/datasets/issues/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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"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8138). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.",
"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?",
"The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8137). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.",
"`datasets`... | 2026-04-16T11:54:09 | 2026-04-27T15:49:42 | 2026-04-27T15:32:29 | null | CONTRIBUTOR | [] | null | null | false | {
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"merged_at": "2026-04-27T15:32... | **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... | {
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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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