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Chaining multiple .filter() calls on an IterableDataset raises a TypeError: 'NoneType' object is not a mapping on the second .filter() call.
In `IterableDataset.filter()`, the internal `ex_iterable` is wrapped with FormattedExamplesIterable:
```python
ex_iterable = FormattedExamplesIterabl... | value:https://api.github.com/repos/huggingface/datasets/issues/8037/comments | value:I_kwDODunzps7u82YW | value:closed | value:0 | value:2026-03-09T17:44:34Z | value:https://api.github.com/repos/huggingface/datasets/issues/8037/labels{/name} | value:8037 | json:{"login": "sh0416", "id": 12251974, "node_id": "MDQ6VXNlcjEyMjUxOTc0", "avatar_url": "https://avatars.githubusercontent.com/u/12251974?v=4", "gravatar_id": "", "url": "https://api.github.com/users/sh0416", "html_url": "https://github.com/sh0416", "followers_url": "https://api.github.com/users/sh0416/followers", "f... | true | ||||||||
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The datasets library cannot use the generated Arrow cache correctly, seemingly due to a flaw in the internal hash symbol calculation logic.
The following code provides verification.
I am trying to locate the specific code position, and if there are further developments, I will update here.
... | value:https://api.github.com/repos/huggingface/datasets/issues/8034/comments | value:I_kwDODunzps7uqxFr | value:open | value:6 | value:2026-10-13T21:43:28Z | value:https://api.github.com/repos/huggingface/datasets/issues/8034/labels{/name} | value:8034 | json:{"login": "Nexround", "id": 12998729, "node_id": "MDQ6VXNlcjEyOTk4NzI5", "avatar_url": "https://avatars.githubusercontent.com/u/12998729?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Nexround", "html_url": "https://github.com/Nexround", "followers_url": "https://api.github.com/users/Nexround/follow... | true | |||||||||||
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`arrow_dataset.py` and `iterable_dataset.py` drain `indices` and `tasks` lists front-to-back via `.pop(0)` during parallel async map operations. With `MAX_NUM_RUNNING_ASYNC_MAP_FUNCTIONS_IN_PARALLEL` items in flight, each `.pop(0)` is **O(n)** making the drain loop **O(n²)**.
## Solution
Switch both... | value:https://api.github.com/repos/huggingface/datasets/issues/8033/comments | value:PR_kwDODunzps7G-QP1 | value:closed | value:2 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8033", "html_url": "https://github.com/huggingface/datasets/pull/8033", "diff_url": "https://github.com/huggingface/datasets/pull/8033.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8033.patch", "merged_at": null} | value:2026-03-07T21:49:34Z | value:https://api.github.com/repos/huggingface/datasets/issues/8033/labels{/name} | value:8033 | json:{"login": "giulio-leone", "id": 6887247, "node_id": "MDQ6VXNlcjY4ODcyNDc=", "avatar_url": "https://avatars.githubusercontent.com/u/6887247?v=4", "gravatar_id": "", "url": "https://api.github.com/users/giulio-leone", "html_url": "https://github.com/giulio-leone", "followers_url": "https://api.github.com/users/giuli... | value:False | true | |||||||||
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Downloaded files still go to `~/.cache/huggingface/hub/` even if I specified `cache_dir` option in `download_config` in `load_dataset`.
### Steps to reproduce the bug
Run my freshly written script and found that downloaded files did not go where I want.
```python
'''
下载OpenWebText数据集，允许使用代... | value:https://api.github.com/repos/huggingface/datasets/issues/8029/comments | value:I_kwDODunzps7uhb53 | value:open | value:2 | value:2026-02-27T23:34:28Z | value:https://api.github.com/repos/huggingface/datasets/issues/8029/labels{/name} | value:8029 | json:{"login": "TsXor", "id": 74352334, "node_id": "MDQ6VXNlcjc0MzUyMzM0", "avatar_url": "https://avatars.githubusercontent.com/u/74352334?v=4", "gravatar_id": "", "url": "https://api.github.com/users/TsXor", "html_url": "https://github.com/TsXor", "followers_url": "https://api.github.com/users/TsXor/followers", "follo... | true | |||||||||||
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Before this change, `AudioDecoder["array"]` reduced multi-channel audio to mono by averaging channels, so the requested channel behavior was not respected.
With this PR:
- multi-channel decoded arrays are preserved by default;
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Examples of supported tool-calling / dataclaw ... | value:https://api.github.com/repos/huggingface/datasets/issues/8027/comments | value:PR_kwDODunzps7GoGjP | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8027", "html_url": "https://github.com/huggingface/datasets/pull/8027", "diff_url": "https://github.com/huggingface/datasets/pull/8027.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8027.patch", "merged_at": "2026-03-09T15:57:57Z"} | value:2026-03-09T15:58:00Z | value:https://api.github.com/repos/huggingface/datasets/issues/8027/labels{/name} | value:8027 | json:{"login": "lhoestq", "id": 42851186, "node_id": "MDQ6VXNlcjQyODUxMTg2", "avatar_url": "https://avatars.githubusercontent.com/u/42851186?v=4", "gravatar_id": "", "url": "https://api.github.com/users/lhoestq", "html_url": "https://github.com/lhoestq", "followers_url": "https://api.github.com/users/lhoestq/followers"... | value:False | true | |||||||||
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This PR fixes a bug where passing `base_path` to `load_dataset_builder()` or `load_dataset()` causes a TypeError because both `builder_kwargs` and `config_kwargs` can contain the same key.
## Problem
When users call:
```python
from datasets import load_dataset
load_dataset("rotten_tom... | value:https://api.github.com/repos/huggingface/datasets/issues/8022/comments | value:PR_kwDODunzps7F5eYs | value:closed | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8022", "html_url": "https://github.com/huggingface/datasets/pull/8022", "diff_url": "https://github.com/huggingface/datasets/pull/8022.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8022.patch", "merged_at": null} | value:2026-02-24T14:01:23Z | value:https://api.github.com/repos/huggingface/datasets/issues/8022/labels{/name} | value:8022 | json:{"login": "Ryan-J-MAX", "id": 79621677, "node_id": "MDQ6VXNlcjc5NjIxNjc3", "avatar_url": "https://avatars.githubusercontent.com/u/79621677?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Ryan-J-MAX", "html_url": "https://github.com/Ryan-J-MAX", "followers_url": "https://api.github.com/users/Ryan-J-MA... | value:False | true | |||||||||
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Summary
The default behavior for the progress bar has been adjusted based on dataset size. It remains enabled for small datasets and is automatically disabled for larger datasets to improve performance. Users retain full control and can explicitly ena... | value:https://api.github.com/repos/huggingface/datasets/issues/8021/comments | value:PR_kwDODunzps7F0FmV | value:open | value:8 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8021", "html_url": "https://github.com/huggingface/datasets/pull/8021", "diff_url": "https://github.com/huggingface/datasets/pull/8021.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8021.patch", "merged_at": null} | value:2026-04-13T06:29:55Z | value:https://api.github.com/repos/huggingface/datasets/issues/8021/labels{/name} | value:8021 | json:{"login": "AnkitAhlawat7742", "id": 199906670, "node_id": "U_kgDOC-pVbg", "avatar_url": "https://avatars.githubusercontent.com/u/199906670?v=4", "gravatar_id": "", "url": "https://api.github.com/users/AnkitAhlawat7742", "html_url": "https://github.com/AnkitAhlawat7742", "followers_url": "https://api.github.com/use... | value:False | true | |||||||||||
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- Adds an optional `return_file_name: bool = False` parameter to `CsvConfig`
- When `return_file_name=True`, a `file_name` column is appended to every batch in `_generate_tables`, containing the basename of the source CSV file for each row
- Default is `False`, preserving full backward compatibility
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This PR improves the RuntimeError message raised when deprecated local dataset scripts are detected.
Previously, the error message:
"Dataset scripts are no longer supported"
did not provide actionable migration guidance.
Improvements
- Clarifies the new architecture
- Provides explicit migratio... | value:https://api.github.com/repos/huggingface/datasets/issues/8017/comments | value:PR_kwDODunzps7FgERR | value:open | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8017", "html_url": "https://github.com/huggingface/datasets/pull/8017", "diff_url": "https://github.com/huggingface/datasets/pull/8017.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8017.patch", "merged_at": null} | value:2026-02-28T14:24:11Z | value:https://api.github.com/repos/huggingface/datasets/issues/8017/labels{/name} | value:8017 | json:{"login": "suryanshbt211", "id": 218385148, "node_id": "U_kgDODQRK_A", "avatar_url": "https://avatars.githubusercontent.com/u/218385148?v=4", "gravatar_id": "", "url": "https://api.github.com/users/suryanshbt211", "html_url": "https://github.com/suryanshbt211", "followers_url": "https://api.github.com/users/suryan... | value:False | true | |||||||||||
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Replace all remaining `:obj:`, `:class:`, `:func:`, and `:meth:` Sphinx cross-reference roles with plain backtick references, aligning with the project's current documentation conventions.
**14 files, 71 replacements. No logic changes.**
## Context
As noted in #5324, the codebase had a mix of old S... | value:https://api.github.com/repos/huggingface/datasets/issues/8016/comments | value:PR_kwDODunzps7FecuC | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8016", "html_url": "https://github.com/huggingface/datasets/pull/8016", "diff_url": "https://github.com/huggingface/datasets/pull/8016.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8016.patch", "merged_at": null} | value:2026-02-23T16:10:21Z | value:https://api.github.com/repos/huggingface/datasets/issues/8016/labels{/name} | value:8016 | json:{"login": "Pchambet", "id": 119671552, "node_id": "U_kgDOByILAA", "avatar_url": "https://avatars.githubusercontent.com/u/119671552?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Pchambet", "html_url": "https://github.com/Pchambet", "followers_url": "https://api.github.com/users/Pchambet/followers", ... | value:False | true | |||||||||||
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For training to work properly it is considered good practice in machine learning to sample the dataset randomly (uniformly). I am not sure how the user is expected to do it correctly when the creator of the dataset did a bad job.
https://huggingface.co/docs/hub/datasets-webdataset
```
**Sh... | value:https://api.github.com/repos/huggingface/datasets/issues/8015/comments | value:I_kwDODunzps7s4rqs | value:open | value:6 | value:2026-05-11T15:08:20Z | value:https://api.github.com/repos/huggingface/datasets/issues/8015/labels{/name} | value:8015 | json:{"login": "unrealwill", "id": 11304248, "node_id": "MDQ6VXNlcjExMzA0MjQ4", "avatar_url": "https://avatars.githubusercontent.com/u/11304248?v=4", "gravatar_id": "", "url": "https://api.github.com/users/unrealwill", "html_url": "https://github.com/unrealwill", "followers_url": "https://api.github.com/users/unrealwil... | true | |||||||||||
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### Problem
For `load_dataset("imagefolder", data_dir=...)`, `get_data_patterns` was repeatedly scanning the same local directory tree for many split patterns (`train`, `test`, etc.).
With large folders, this became very slow. This has also been repo... | value:https://api.github.com/repos/huggingface/datasets/issues/8014/comments | value:PR_kwDODunzps7FV93G | value:open | value:2 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8014", "html_url": "https://github.com/huggingface/datasets/pull/8014", "diff_url": "https://github.com/huggingface/datasets/pull/8014.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8014.patch", "merged_at": null} | value:2026-02-25T20:07:50Z | value:https://api.github.com/repos/huggingface/datasets/issues/8014/labels{/name} | value:8014 | json:{"login": "AsymptotaX", "id": 2968413, "node_id": "MDQ6VXNlcjI5Njg0MTM=", "avatar_url": "https://avatars.githubusercontent.com/u/2968413?v=4", "gravatar_id": "", "url": "https://api.github.com/users/AsymptotaX", "html_url": "https://github.com/AsymptotaX", "followers_url": "https://api.github.com/users/AsymptotaX/... | value:False | true | |||||||||||
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The `operation.To` part would actually render as a hyperlink when printed to Slack. | value:https://api.github.com/repos/huggingface/datasets/issues/8013/comments | value:PR_kwDODunzps7E8Ovb | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8013", "html_url": "https://github.com/huggingface/datasets/pull/8013", "diff_url": "https://github.com/huggingface/datasets/pull/8013.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8013.patch", "merged_at": null} | value:2026-02-19T17:31:56Z | value:https://api.github.com/repos/huggingface/datasets/issues/8013/labels{/name} | value:8013 | json:{"login": "valencik", "id": 5440389, "node_id": "MDQ6VXNlcjU0NDAzODk=", "avatar_url": "https://avatars.githubusercontent.com/u/5440389?v=4", "gravatar_id": "", "url": "https://api.github.com/users/valencik", "html_url": "https://github.com/valencik", "followers_url": "https://api.github.com/users/valencik/follower... | value:False | true | |||||||||||
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It looks like the current documentation suggests loading the dataset like this:
`load_dataset("Hello-SimpleAI/HC3", split="train")
`
But with datasets>=3.x, this raises:
RuntimeError: Dataset scripts are no longer supported, but found HC3.py
The dataset loads correctly if we specify the... | value:https://api.github.com/repos/huggingface/datasets/issues/8012/comments | value:I_kwDODunzps7sQ6QD | value:closed | value:1 | value:2026-02-20T11:58:20Z | value:https://api.github.com/repos/huggingface/datasets/issues/8012/labels{/name} | value:8012 | json:{"login": "navan0", "id": 15803320, "node_id": "MDQ6VXNlcjE1ODAzMzIw", "avatar_url": "https://avatars.githubusercontent.com/u/15803320?v=4", "gravatar_id": "", "url": "https://api.github.com/users/navan0", "html_url": "https://github.com/navan0", "followers_url": "https://api.github.com/users/navan0/followers", "f... | true | ||||||||
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Accept `Value("large_string")` in addition to `Value("string")` for the `file_name` (or `*_file_name`) metadata key in folder-based builders (e.g. `audiofolder`).
## Problem
When loading a dataset with `load_dataset("audiofolder", data_dir=...)` and a `metadata.csv` file, the metadata schema i... | value:https://api.github.com/repos/huggingface/datasets/issues/8011/comments | value:PR_kwDODunzps7E59Pn | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8011", "html_url": "https://github.com/huggingface/datasets/pull/8011", "diff_url": "https://github.com/huggingface/datasets/pull/8011.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8011.patch", "merged_at": null} | value:2026-02-19T15:29:29Z | value:https://api.github.com/repos/huggingface/datasets/issues/8011/labels{/name} | value:8011 | json:{"login": "Koosh0610", "id": 119339573, "node_id": "U_kgDOBxz6NQ", "avatar_url": "https://avatars.githubusercontent.com/u/119339573?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Koosh0610", "html_url": "https://github.com/Koosh0610", "followers_url": "https://api.github.com/users/Koosh0610/follower... | value:False | true | |||||||||
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When loading a dataset with load_dataset("audiofolder", data_dir=...) and a metadata.csv (with a file_name column), loading can fail with:
`ValueError: file_name or *_file_name must be present as dictionary key (with type string) in metadata files`
even when the CSV clearly has a file_name... | value:https://api.github.com/repos/huggingface/datasets/issues/8010/comments | value:I_kwDODunzps7sPWzu | value:closed | value:1 | value:2026-02-19T15:29:41Z | value:https://api.github.com/repos/huggingface/datasets/issues/8010/labels{/name} | value:8010 | json:{"login": "Koosh0610", "id": 119339573, "node_id": "U_kgDOBxz6NQ", "avatar_url": "https://avatars.githubusercontent.com/u/119339573?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Koosh0610", "html_url": "https://github.com/Koosh0610", "followers_url": "https://api.github.com/users/Koosh0610/follower... | true | ||||||||
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Currently, `torchcodec` don't allow extracting `Audio` from `Video` https://github.com/meta-pytorch/torchcodec/issues/1158, but when I upload videos with audio to hub using `videofolder`, then this is not possible to retrieve audio from it. Probably `VideoDecoder` can be extended with `audio... | value:https://api.github.com/repos/huggingface/datasets/issues/8007/comments | value:I_kwDODunzps7rPcqh | value:open | value:7 | value:2026-06-17T15:25:31Z | value:https://api.github.com/repos/huggingface/datasets/issues/8007/labels{/name} | value:8007 | json:{"login": "Samoed", "id": 36135455, "node_id": "MDQ6VXNlcjM2MTM1NDU1", "avatar_url": "https://avatars.githubusercontent.com/u/36135455?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Samoed", "html_url": "https://github.com/Samoed", "followers_url": "https://api.github.com/users/Samoed/followers", "f... | true | ||||||||||
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Dataset.from_generator splits any list kwarg to the generator and makes a separate call to the generator for each member of the list even in the num_proc=1 case.
I have a generator that processes a number of files, filtering them and producing examples. It used to be the case that things wor... | value:https://api.github.com/repos/huggingface/datasets/issues/8006/comments | value:I_kwDODunzps7rGq1a | value:closed | value:0 | value:2026-02-24T13:58:12Z | value:https://api.github.com/repos/huggingface/datasets/issues/8006/labels{/name} | value:8006 | json:{"login": "hartmans", "id": 53510, "node_id": "MDQ6VXNlcjUzNTEw", "avatar_url": "https://avatars.githubusercontent.com/u/53510?v=4", "gravatar_id": "", "url": "https://api.github.com/users/hartmans", "html_url": "https://github.com/hartmans", "followers_url": "https://api.github.com/users/hartmans/followers", "fol... | true | ||||||||
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The `num_channels` parameter in `datasets.Audio()` is documented to preserve stereo channels when set to `None` (preserve original) or `2` (explicit stereo), but it currently downmixes all audio to mono regardless of this setting.
### Steps to reproduce the bug
```python
import numpy as np... | value:https://api.github.com/repos/huggingface/datasets/issues/8005/comments | value:I_kwDODunzps7q9L9J | value:open | value:2 | value:2026-02-25T15:17:18Z | value:https://api.github.com/repos/huggingface/datasets/issues/8005/labels{/name} | value:8005 | json:{"login": "ZackHodari", "id": 9717211, "node_id": "MDQ6VXNlcjk3MTcyMTE=", "avatar_url": "https://avatars.githubusercontent.com/u/9717211?v=4", "gravatar_id": "", "url": "https://api.github.com/users/ZackHodari", "html_url": "https://github.com/ZackHodari", "followers_url": "https://api.github.com/users/ZackHodari/... | true | |||||||||||
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Fixed by converting the path argument with `os.fspath()` before... | value:https://api.github.com/repos/huggingface/datasets/issues/8004/comments | value:PR_kwDODunzps7DsCBM | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8004", "html_url": "https://github.com/huggingface/datasets/pull/8004", "diff_url": "https://github.com/huggingface/datasets/pull/8004.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8004.patch", "merged_at": null} | value:2026-07-23T02:28:21Z | value:https://api.github.com/repos/huggingface/datasets/issues/8004/labels{/name} | value:8004 | json:{"login": "Mr-Neutr0n", "id": 64578610, "node_id": "MDQ6VXNlcjY0NTc4NjEw", "avatar_url": "https://avatars.githubusercontent.com/u/64578610?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Mr-Neutr0n", "html_url": "https://github.com/Mr-Neutr0n", "followers_url": "https://api.github.com/users/Mr-Neutr0... | value:False | true | |||||||||
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**I'm not sure if this is a bug.**
I see that a `FeatureType` object contains an attribute called `self.dtype` that is not covered when this feature is a `Sequence` or a `List`.
When I try to run a multilabel classification with this example script from the transformers library:
https://g... | value:https://api.github.com/repos/huggingface/datasets/issues/8002/comments | value:I_kwDODunzps7qqhA2 | value:open | value:0 | value:2026-02-13T12:52:36Z | value:https://api.github.com/repos/huggingface/datasets/issues/8002/labels{/name} | value:8002 | json:{"login": "gonzalo-santamaria-iic", "id": 167085390, "node_id": "U_kgDOCfWFTg", "avatar_url": "https://avatars.githubusercontent.com/u/167085390?v=4", "gravatar_id": "", "url": "https://api.github.com/users/gonzalo-santamaria-iic", "html_url": "https://github.com/gonzalo-santamaria-iic", "followers_url": "https://... | true | |||||||||||
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**Summary**
Addressed the inconsistent environment variable name HF_DATASETS_DISABLE_PROGRESS_BARS used for toggling progress bars, particularly in docstrings and warning messages.
**Changes**
Updated function docstrings to use the correct envir... | value:https://api.github.com/repos/huggingface/datasets/issues/8000/comments | value:PR_kwDODunzps7CpK9i | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8000", "html_url": "https://github.com/huggingface/datasets/pull/8000", "diff_url": "https://github.com/huggingface/datasets/pull/8000.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8000.patch", "merged_at": "2026-02-16T15:29:49Z"} | value:2026-02-16T15:29:49Z | value:https://api.github.com/repos/huggingface/datasets/issues/8000/labels{/name} | value:8000 | json:{"login": "AnkitAhlawat7742", "id": 199906670, "node_id": "U_kgDOC-pVbg", "avatar_url": "https://avatars.githubusercontent.com/u/199906670?v=4", "gravatar_id": "", "url": "https://api.github.com/users/AnkitAhlawat7742", "html_url": "https://github.com/AnkitAhlawat7742", "followers_url": "https://api.github.com/use... | value:False | true | |||||||||
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I’m working on training with a large-scale dataset (100+ Parquet files) using lazy loading, and I’m struggling to understand/optimize the num_shards setting— in the lerobot repo: streaming_datasets.py:
```
from datasets import load_dataset
self.hf_dataset: datasets.IterableDataset = load_dataset(
... | value:https://api.github.com/repos/huggingface/datasets/issues/7999/comments | value:I_kwDODunzps7pX8Ta | value:open | value:1 | value:2026-02-15T14:25:56Z | value:https://api.github.com/repos/huggingface/datasets/issues/7999/labels{/name} | value:7999 | json:{"login": "D222097", "id": 50061868, "node_id": "MDQ6VXNlcjUwMDYxODY4", "avatar_url": "https://avatars.githubusercontent.com/u/50061868?v=4", "gravatar_id": "", "url": "https://api.github.com/users/D222097", "html_url": "https://github.com/D222097", "followers_url": "https://api.github.com/users/D222097/followers"... | true | |||||||||||
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https://github.com/huggingface/datasets/blob/025593f2f0722f31fc136e0ae45da4ff44d4416a/src/datasets/config.py#L221-L226
Docstrings and warnings report env var name `HF_DATASETS_DISABLE_PROGRESS_BAR` without the ending `S`.
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## Summary
When Dataset.map is called and the first examples processed return None, the writer is never properly initialized, causing a ValueError.
## Changes
- Modified _map_single to initialize the writer early if the first batch returns empty results
- Ensures writer is set before the first cal... | value:https://api.github.com/repos/huggingface/datasets/issues/7997/comments | value:PR_kwDODunzps7CRNIl | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7997", "html_url": "https://github.com/huggingface/datasets/pull/7997", "diff_url": "https://github.com/huggingface/datasets/pull/7997.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7997.patch", "merged_at": null} | value:2026-02-11T08:23:06Z | value:https://api.github.com/repos/huggingface/datasets/issues/7997/labels{/name} | value:7997 | json:{"login": "veeceey", "id": 34209028, "node_id": "MDQ6VXNlcjM0MjA5MDI4", "avatar_url": "https://avatars.githubusercontent.com/u/34209028?v=4", "gravatar_id": "", "url": "https://api.github.com/users/veeceey", "html_url": "https://github.com/veeceey", "followers_url": "https://api.github.com/users/veeceey/followers"... | value:False | true | |||||||||
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Fixes #7990
This PR fixes a bug in `Dataset.map()` where the writer initialization was incorrectly tied to the index being 0, causing crashes when the map function returns `None` for the first few examples and later returns a dict.
### Changes
- **Non-batched mode** (line 3676): Changed from `if i... | value:https://api.github.com/repos/huggingface/datasets/issues/7996/comments | value:PR_kwDODunzps7CQ6GC | value:open | value:3 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7996", "html_url": "https://github.com/huggingface/datasets/pull/7996", "diff_url": "https://github.com/huggingface/datasets/pull/7996.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7996.patch", "merged_at": null} | value:2026-04-09T07:44:00Z | value:https://api.github.com/repos/huggingface/datasets/issues/7996/labels{/name} | value:7996 | json:{"login": "veeceey", "id": 34209028, "node_id": "MDQ6VXNlcjM0MjA5MDI4", "avatar_url": "https://avatars.githubusercontent.com/u/34209028?v=4", "gravatar_id": "", "url": "https://api.github.com/users/veeceey", "html_url": "https://github.com/veeceey", "followers_url": "https://api.github.com/users/veeceey/followers"... | value:False | true | |||||||||||
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I saw you had some API compat issues in the past (https://github.com/huggingface/datasets/issues/7326) and I understand the need for an upper bound.
But I wonder if you think your CI and tests are a good proxy to catch fsspec API breakage... | value:https://api.github.com/repos/huggingface/datasets/issues/7994/comments | value:I_kwDODunzps7o1eC2 | value:closed | value:0 | value:2026-02-16T15:29:00Z | value:https://api.github.com/repos/huggingface/datasets/issues/7994/labels{/name} | value:7994 | json:{"login": "hadim", "id": 528003, "node_id": "MDQ6VXNlcjUyODAwMw==", "avatar_url": "https://avatars.githubusercontent.com/u/528003?v=4", "gravatar_id": "", "url": "https://api.github.com/users/hadim", "html_url": "https://github.com/hadim", "followers_url": "https://api.github.com/users/hadim/followers", "following... | true | ||||||||
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It also adds a utility function, `sparse_collate_f... | value:https://api.github.com/repos/huggingface/datasets/issues/7993/comments | value:PR_kwDODunzps7Bkr3F | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7993", "html_url": "https://github.com/huggingface/datasets/pull/7993", "diff_url": "https://github.com/huggingface/datasets/pull/7993.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7993.patch", "merged_at": null} | value:2026-02-04T22:00:48Z | value:https://api.github.com/repos/huggingface/datasets/issues/7993/labels{/name} | value:7993 | json:{"login": "Ebraheem1", "id": 22107086, "node_id": "MDQ6VXNlcjIyMTA3MDg2", "avatar_url": "https://avatars.githubusercontent.com/u/22107086?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Ebraheem1", "html_url": "https://github.com/Ebraheem1", "followers_url": "https://api.github.com/users/Ebraheem1/fo... | value:False | true | |||||||||||
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```py
>>> dataset
IterableDataset({
features: ['label', 'title', 'content'],
num_shards: 4
})
>>> dataset.reshard()
IterableDataset({
features: ['label', 'title', 'content'],
num_shards: 3600
})
`... | value:https://api.github.com/repos/huggingface/datasets/issues/7992/comments | value:PR_kwDODunzps7BiJps | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7992", "html_url": "https://github.com/huggingface/datasets/pull/7992", "diff_url": "https://github.com/huggingface/datasets/pull/7992.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7992.patch", "merged_at": "2026-02-04T18:55:35Z"} | value:2026-03-11T15:25:17Z | value:https://api.github.com/repos/huggingface/datasets/issues/7992/labels{/name} | value:7992 | json:{"login": "lhoestq", "id": 42851186, "node_id": "MDQ6VXNlcjQyODUxMTg2", "avatar_url": "https://avatars.githubusercontent.com/u/42851186?v=4", "gravatar_id": "", "url": "https://api.github.com/users/lhoestq", "html_url": "https://github.com/lhoestq", "followers_url": "https://api.github.com/users/lhoestq/followers"... | value:False | true | |||||||||
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```
from huggingface_hub import H... | value:https://api.github.com/repos/huggingface/datasets/issues/7991/comments | value:I_kwDODunzps7oRb0h | value:closed | value:0 | value:2026-02-05T10:30:09Z | value:https://api.github.com/repos/huggingface/datasets/issues/7991/labels{/name} | value:7991 | json:{"login": "Moll-j", "id": 199609168, "node_id": "U_kgDOC-XLUA", "avatar_url": "https://avatars.githubusercontent.com/u/199609168?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Moll-j", "html_url": "https://github.com/Moll-j", "followers_url": "https://api.github.com/users/Moll-j/followers", "followi... | true | ||||||||
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I detected a serious [bug from datasets/arrow_dataset.py](https://github.com/huggingface/datasets/blob/main/src/datasets/arrow_dataset.py#L3676)
---
**Description of the bug**
`Dataset.map` crashes with `writer is None` when the map function returns `None` for the first few examples and a d... | value:https://api.github.com/repos/huggingface/datasets/issues/7990/comments | value:I_kwDODunzps7oNkVq | value:open | value:2 | value:2026-05-26T19:09:11Z | value:https://api.github.com/repos/huggingface/datasets/issues/7990/labels{/name} | value:7990 | json:{"login": "meta-program", "id": 30819640, "node_id": "MDQ6VXNlcjMwODE5NjQw", "avatar_url": "https://avatars.githubusercontent.com/u/30819640?v=4", "gravatar_id": "", "url": "https://api.github.com/users/meta-program", "html_url": "https://github.com/meta-program", "followers_url": "https://api.github.com/users/met... | true | |||||||||||
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cc @Wauplin just for viz since you introduced this in https://github.com/huggingface/datasets/pull/7783. | value:https://api.github.com/repos/huggingface/datasets/issues/7989/comments | value:PR_kwDODunzps7BaxDx | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7989", "html_url": "https://github.com/huggingface/datasets/pull/7989", "diff_url": "https://github.com/huggingface/datasets/pull/7989.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7989.patch", "merged_at": "2026-02-04T15:20:02Z"} | value:2026-02-04T15:20:04Z | value:https://api.github.com/repos/huggingface/datasets/issues/7989/labels{/name} | value:7989 | json:{"login": "hanouticelina", "id": 36770234, "node_id": "MDQ6VXNlcjM2NzcwMjM0", "avatar_url": "https://avatars.githubusercontent.com/u/36770234?v=4", "gravatar_id": "", "url": "https://api.github.com/users/hanouticelina", "html_url": "https://github.com/hanouticelina", "followers_url": "https://api.github.com/users/... | value:False | true | |||||||||
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# Repro
These two conditions seem to consistently reproduce the issue:
- function passed to `Dataset.map()` explicitly or implicitly calls `import polars as pl`
- `num_proc` > 1
# Trace
```
RemoteTraceback Traceback (most recent call last)
RemoteTraceback:
"""
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```
original_shard_lengths[original_shard_id] += 1
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
IndexError: list index out of range
```
Not sure what causes it, but this fixes the error. This may not be the proper fix for the root cause though. | value:https://api.github.com/repos/huggingface/datasets/issues/7987/comments | value:PR_kwDODunzps7BX0pY | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7987", "html_url": "https://github.com/huggingface/datasets/pull/7987", "diff_url": "https://github.com/huggingface/datasets/pull/7987.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7987.patch", "merged_at": null} | value:2026-03-09T17:37:03Z | value:https://api.github.com/repos/huggingface/datasets/issues/7987/labels{/name} | value:7987 | json:{"login": "jonathanasdf", "id": 511073, "node_id": "MDQ6VXNlcjUxMTA3Mw==", "avatar_url": "https://avatars.githubusercontent.com/u/511073?v=4", "gravatar_id": "", "url": "https://api.github.com/users/jonathanasdf", "html_url": "https://github.com/jonathanasdf", "followers_url": "https://api.github.com/users/jonatha... | value:False | true | |||||||||
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When using `.map()` with a function defined inside a **class (of which has any non-deterministic states)** method (a closure), if that function captures `self` to access a configuration variable (e.g., self.foo), the fingerprint mechanism serializes the entire class instance state.
If the c... | value:https://api.github.com/repos/huggingface/datasets/issues/7986/comments | value:I_kwDODunzps7oBw7L | value:open | value:1 | value:2026-02-06T08:38:13Z | value:https://api.github.com/repos/huggingface/datasets/issues/7986/labels{/name} | value:7986 | json:{"login": "Cloud0310", "id": 60375730, "node_id": "MDQ6VXNlcjYwMzc1NzMw", "avatar_url": "https://avatars.githubusercontent.com/u/60375730?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Cloud0310", "html_url": "https://github.com/Cloud0310", "followers_url": "https://api.github.com/users/Cloud0310/fo... | true | |||||||||||
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e.g. the lance dataset at https://huggingface.co/datasets/davanstrien/encyclopaedia-britannica-lance has > 200 metadata files
those optims are not used anymore, they come from a time we were dealing with slow data files iterators instead of list... | value:https://api.github.com/repos/huggingface/datasets/issues/7985/comments | value:PR_kwDODunzps7BQaGn | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7985", "html_url": "https://github.com/huggingface/datasets/pull/7985", "diff_url": "https://github.com/huggingface/datasets/pull/7985.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7985.patch", "merged_at": "2026-02-03T18:30:28Z"} | value:2026-02-03T18:30:30Z | value:https://api.github.com/repos/huggingface/datasets/issues/7985/labels{/name} | value:7985 | json:{"login": "lhoestq", "id": 42851186, "node_id": "MDQ6VXNlcjQyODUxMTg2", "avatar_url": "https://avatars.githubusercontent.com/u/42851186?v=4", "gravatar_id": "", "url": "https://api.github.com/users/lhoestq", "html_url": "https://github.com/lhoestq", "followers_url": "https://api.github.com/users/lhoestq/followers"... | value:False | true | |||||||||
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This introduces a `zarr` packaged module and docs/tests to validate basic loading.
Note: I pushed a follow-up commit to fix an accidental duplication in `benchmarks/benchmark_zarr_streaming.py` (file now contains a single benchmark script). | value:https://api.github.com/repos/huggingface/datasets/issues/7983/comments | value:PR_kwDODunzps7BCJgV | value:open | value:9 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7983", "html_url": "https://github.com/huggingface/datasets/pull/7983", "diff_url": "https://github.com/huggingface/datasets/pull/7983.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7983.patch", "merged_at": null} | value:2026-08-21T05:20:45Z | value:https://api.github.com/repos/huggingface/datasets/issues/7983/labels{/name} | value:7983 | json:{"login": "KOKOSde", "id": 163377666, "node_id": "U_kgDOCbzyAg", "avatar_url": "https://avatars.githubusercontent.com/u/163377666?v=4", "gravatar_id": "", "url": "https://api.github.com/users/KOKOSde", "html_url": "https://github.com/KOKOSde", "followers_url": "https://api.github.com/users/KOKOSde/followers", "fol... | value:False | true | |||||||||||
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Some tokenizers backed by `tokenizers.Tokenizer` mutate runtime settings (padding/truncation) when called, which can change the serialized state and make dataset fingerprints unstable. That prevents `.map(load_from_cache_file=True)` from... | value:https://api.github.com/repos/huggingface/datasets/issues/7982/comments | value:PR_kwDODunzps7BB1zZ | value:closed | value:4 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7982", "html_url": "https://github.com/huggingface/datasets/pull/7982", "diff_url": "https://github.com/huggingface/datasets/pull/7982.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7982.patch", "merged_at": "2026-03-09T18:30:41Z"} | value:2026-03-09T18:48:40Z | value:https://api.github.com/repos/huggingface/datasets/issues/7982/labels{/name} | value:7982 | json:{"login": "KOKOSde", "id": 163377666, "node_id": "U_kgDOCbzyAg", "avatar_url": "https://avatars.githubusercontent.com/u/163377666?v=4", "gravatar_id": "", "url": "https://api.github.com/users/KOKOSde", "html_url": "https://github.com/KOKOSde", "followers_url": "https://api.github.com/users/KOKOSde/followers", "fol... | value:False | true | |||||||||
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this is enabled for for datasets loaded using streaming=True/False | value:https://api.github.com/repos/huggingface/datasets/issues/7979/comments | value:PR_kwDODunzps7A9T06 | value:closed | value:5 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7979", "html_url": "https://github.com/huggingface/datasets/pull/7979", "diff_url": "https://github.com/huggingface/datasets/pull/7979.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7979.patch", "merged_at": "2026-02-02T16:26:14Z"} | value:2026-02-27T23:28:51Z | value:https://api.github.com/repos/huggingface/datasets/issues/7979/labels{/name} | value:7979 | json:{"login": "lhoestq", "id": 42851186, "node_id": "MDQ6VXNlcjQyODUxMTg2", "avatar_url": "https://avatars.githubusercontent.com/u/42851186?v=4", "gravatar_id": "", "url": "https://api.github.com/users/lhoestq", "html_url": "https://github.com/lhoestq", "followers_url": "https://api.github.com/users/lhoestq/followers"... | value:False | true | |||||||||
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Problem: load_dataset("dataset", base_path="./data")` gives TypeError("multiple values for keyword 'base_path')
Fix: {**builder_kwargs, **config_kwargs} to user kwargs override dataset defaults
Repro : python
Before: TypeError
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This helps new users discover the most direct way to build a small dataset from in-memory Python data.
Docs-only change. | value:https://api.github.com/repos/huggingface/datasets/issues/7975/comments | value:PR_kwDODunzps7AikAO | value:open | value:2 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7975", "html_url": "https://github.com/huggingface/datasets/pull/7975", "diff_url": "https://github.com/huggingface/datasets/pull/7975.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7975.patch", "merged_at": null} | value:2026-05-03T03:40:00Z | value:https://api.github.com/repos/huggingface/datasets/issues/7975/labels{/name} | value:7975 | json:{"login": "KOKOSde", "id": 163377666, "node_id": "U_kgDOCbzyAg", "avatar_url": "https://avatars.githubusercontent.com/u/163377666?v=4", "gravatar_id": "", "url": "https://api.github.com/users/KOKOSde", "html_url": "https://github.com/KOKOSde", "followers_url": "https://api.github.com/users/KOKOSde/followers", "fol... | value:False | true | |||||||||||
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Some module factories provide values in `builder_kwargs` (e.g. `base_path`), and users can also pass the same keys via `config_kwargs`, which raises:
`TypeError: ... got multiple values for keyword argument ...`.
Fix: if `config_kwargs` is pro... | value:https://api.github.com/repos/huggingface/datasets/issues/7974/comments | value:PR_kwDODunzps7Aij_g | value:closed | value:3 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7974", "html_url": "https://github.com/huggingface/datasets/pull/7974", "diff_url": "https://github.com/huggingface/datasets/pull/7974.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7974.patch", "merged_at": null} | value:2026-05-04T12:50:52Z | value:https://api.github.com/repos/huggingface/datasets/issues/7974/labels{/name} | value:7974 | json:{"login": "KOKOSde", "id": 163377666, "node_id": "U_kgDOCbzyAg", "avatar_url": "https://avatars.githubusercontent.com/u/163377666?v=4", "gravatar_id": "", "url": "https://api.github.com/users/KOKOSde", "html_url": "https://github.com/KOKOSde", "followers_url": "https://api.github.com/users/KOKOSde/followers", "fol... | value:False | true | |||||||||
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Problem: on the local `file://` filesystem, `fsspec` can report symlinks as `type=="other"` and omit the `islink` flag, so symlinked files are skipped.
Fix: when `protocol=="file"`, treat `os.path.islink(filepath)` as a link candidate and include it if it resol... | value:https://api.github.com/repos/huggingface/datasets/issues/7973/comments | value:PR_kwDODunzps7AiMd8 | value:open | value:5 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7973", "html_url": "https://github.com/huggingface/datasets/pull/7973", "diff_url": "https://github.com/huggingface/datasets/pull/7973.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7973.patch", "merged_at": null} | value:2026-05-04T12:49:11Z | value:https://api.github.com/repos/huggingface/datasets/issues/7973/labels{/name} | value:7973 | json:{"login": "KOKOSde", "id": 163377666, "node_id": "U_kgDOCbzyAg", "avatar_url": "https://avatars.githubusercontent.com/u/163377666?v=4", "gravatar_id": "", "url": "https://api.github.com/users/KOKOSde", "html_url": "https://github.com/KOKOSde", "followers_url": "https://api.github.com/users/KOKOSde/followers", "fol... | value:False | true | |||||||||||
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Videos are uploaded as PLAIN in Parquet to make sure they can be seeked remotely and with random access to frames in https://github.com/huggingface/datasets/pull/7976
In th... | value:https://api.github.com/repos/huggingface/datasets/issues/7971/comments | value:PR_kwDODunzps7AMzLl | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7971", "html_url": "https://github.com/huggingface/datasets/pull/7971", "diff_url": "https://github.com/huggingface/datasets/pull/7971.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7971.patch", "merged_at": "2026-01-29T18:56:04Z"} | value:2026-01-31T11:50:25Z | value:https://api.github.com/repos/huggingface/datasets/issues/7971/labels{/name} | value:7971 | json:{"login": "lhoestq", "id": 42851186, "node_id": "MDQ6VXNlcjQyODUxMTg2", "avatar_url": "https://avatars.githubusercontent.com/u/42851186?v=4", "gravatar_id": "", "url": "https://api.github.com/users/lhoestq", "html_url": "https://github.com/lhoestq", "followers_url": "https://api.github.com/users/lhoestq/followers"... | value:False | true | |||||||||
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Attempt to load a dataset from a csv with a single `audio` column with a single row with a path to an audio file fails when casting the column to Audio, but the exact same dataset created from a dictionary succeeds.
### Steps to reproduce the bug
1. Have any valid audio file `audio.wav`
2.... | value:https://api.github.com/repos/huggingface/datasets/issues/7970/comments | value:I_kwDODunzps7mpvMC | value:open | value:5 | value:2026-04-04T12:45:45Z | value:https://api.github.com/repos/huggingface/datasets/issues/7970/labels{/name} | value:7970 | json:{"login": "jstangroome", "id": 148754, "node_id": "MDQ6VXNlcjE0ODc1NA==", "avatar_url": "https://avatars.githubusercontent.com/u/148754?v=4", "gravatar_id": "", "url": "https://api.github.com/users/jstangroome", "html_url": "https://github.com/jstangroome", "followers_url": "https://api.github.com/users/jstangroom... | true | |||||||||||
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In [1]: from datasets import load_dataset_builder, StreamingDownloadManager
In [2]: b = load_dataset_builder("lance-format/openvid-lance")
Resolving data files: 100%|█| 240/240 [00:00<00:00, 42675.64it/s
In [3]: b.count_examples(StreamingDownloadManager())
Out[3]: {'train': 937957}
``` | value:https://api.github.com/repos/huggingface/datasets/issues/7969/comments | value:PR_kwDODunzps6_1p9H | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7969", "html_url": "https://github.com/huggingface/datasets/pull/7969", "diff_url": "https://github.com/huggingface/datasets/pull/7969.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7969.patch", "merged_at": "2026-01-28T13:00:23Z"} | value:2026-01-28T13:00:26Z | value:https://api.github.com/repos/huggingface/datasets/issues/7969/labels{/name} | value:7969 | json:{"login": "lhoestq", "id": 42851186, "node_id": "MDQ6VXNlcjQyODUxMTg2", "avatar_url": "https://avatars.githubusercontent.com/u/42851186?v=4", "gravatar_id": "", "url": "https://api.github.com/users/lhoestq", "html_url": "https://github.com/lhoestq", "followers_url": "https://api.github.com/users/lhoestq/followers"... | value:False | true | |||||||||
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```
def to_blocks(table: Union[pa.Table, Table]) -> list[list[TableBlock]]:
if isinstance(table, pa.Table):
return [[InMemoryTable(table)]]
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Detects bad multiprocessing start_method, fallback happens.
https://github.com/huggingface/datasets/issues/7756 | value:https://api.github.com/repos/huggingface/datasets/issues/7967/comments | value:PR_kwDODunzps6_wnm8 | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7967", "html_url": "https://github.com/huggingface/datasets/pull/7967", "diff_url": "https://github.com/huggingface/datasets/pull/7967.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7967.patch", "merged_at": null} | value:2026-01-31T18:26:03Z | value:https://api.github.com/repos/huggingface/datasets/issues/7967/labels{/name} | value:7967 | json:{"login": "vedanta777", "id": 218264809, "node_id": "U_kgDODQJ06Q", "avatar_url": "https://avatars.githubusercontent.com/u/218264809?v=4", "gravatar_id": "", "url": "https://api.github.com/users/vedanta777", "html_url": "https://github.com/vedanta777", "followers_url": "https://api.github.com/users/vedanta777/foll... | value:False | true | |||||||||||
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```python
from datasets import load_dataset
ds = load_dataset("lance-format/laion-1m", streaming=True, split="train")
print(ds.feature["image"])
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https://github.com/mlflow/mlflow/actions/runs/21368603305/job/61506951617
```
ests/data/test_huggingface_dataset_and_source.py::test_from_huggingface_dataset_constructs_expected_dataset_with_revision - huggingface_hub.errors.HfHubHTTPError: 404 C... | value:https://api.github.com/repos/huggingface/datasets/issues/7965/comments | value:I_kwDODunzps7l-8ld | value:closed | value:8 | value:2026-01-28T15:14:50Z | value:https://api.github.com/repos/huggingface/datasets/issues/7965/labels{/name} | value:7965 | json:{"login": "harupy", "id": 17039389, "node_id": "MDQ6VXNlcjE3MDM5Mzg5", "avatar_url": "https://avatars.githubusercontent.com/u/17039389?v=4", "gravatar_id": "", "url": "https://api.github.com/users/harupy", "html_url": "https://github.com/harupy", "followers_url": "https://api.github.com/users/harupy/followers", "f... | true | ||||||||
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src/datasets/splits.py
by:
Fixing pluralization/grammar errors in docstrings (Lines 62, 73, 403).
Adding Python type hints to the
NamedSplit
constructor for better code quality.
Verified with ruff format and ruff check. | value:https://api.github.com/repos/huggingface/datasets/issues/7960/comments | value:PR_kwDODunzps6-8Iak | value:closed | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7960", "html_url": "https://github.com/huggingface/datasets/pull/7960", "diff_url": "https://github.com/huggingface/datasets/pull/7960.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7960.patch", "merged_at": "2026-01-23T16:04:40Z"} | value:2026-01-30T05:14:00Z | value:https://api.github.com/repos/huggingface/datasets/issues/7960/labels{/name} | value:7960 | json:{"login": "Edge-Explorer", "id": 192764477, "node_id": "U_kgDOC31aPQ", "avatar_url": "https://avatars.githubusercontent.com/u/192764477?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Edge-Explorer", "html_url": "https://github.com/Edge-Explorer", "followers_url": "https://api.github.com/users/Edge-E... | value:False | true | |||||||||
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The problem is that when calling:
```ds.set_format(type="torch", columns = ["input", "labels"], device="cuda")```
The device type of the individual datapoints is now: `cpu` as opposed to `cuda:0`.
With `v4.0.0` it still works. With `v4.5.0` it doesn't work anymore.
Related Issue:
https://... | value:https://api.github.com/repos/huggingface/datasets/issues/7958/comments | value:I_kwDODunzps7lT2AI | value:closed | value:5 | value:2026-03-04T13:17:28Z | value:https://api.github.com/repos/huggingface/datasets/issues/7958/labels{/name} | value:7958 | json:{"login": "ai-nikolai", "id": 9797804, "node_id": "MDQ6VXNlcjk3OTc4MDQ=", "avatar_url": "https://avatars.githubusercontent.com/u/9797804?v=4", "gravatar_id": "", "url": "https://api.github.com/users/ai-nikolai", "html_url": "https://github.com/ai-nikolai", "followers_url": "https://api.github.com/users/ai-nikolai/... | true | ||||||||
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- Corrected logic to ensure each sample is picked exactly once when using
stopping_strategy="all_exhausted_without_replacement".
- Adjusted boolean stopping condition to properly track dataset exhaustion.
- Added test to verify... | value:https://api.github.com/repos/huggingface/datasets/issues/7957/comments | value:PR_kwDODunzps6-hVW5 | value:closed | value:2 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7957", "html_url": "https://github.com/huggingface/datasets/pull/7957", "diff_url": "https://github.com/huggingface/datasets/pull/7957.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7957.patch", "merged_at": null} | value:2026-01-23T16:09:28Z | value:https://api.github.com/repos/huggingface/datasets/issues/7957/labels{/name} | value:7957 | json:{"login": "ashmi8", "id": 105732253, "node_id": "U_kgDOBk1YnQ", "avatar_url": "https://avatars.githubusercontent.com/u/105732253?v=4", "gravatar_id": "", "url": "https://api.github.com/users/ashmi8", "html_url": "https://github.com/ashmi8", "followers_url": "https://api.github.com/users/ashmi8/followers", "followi... | value:False | true | |||||||||
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Can the hard limit of 10k files per folder be extended with acceptable loss in performance?
### Motivation
I'm uploading a lance dataset to huggingface hub and have a folder inside lance internals (`data/*.lance/_transactions`) that has > 20k atomic transaction records and my commits are be... | value:https://api.github.com/repos/huggingface/datasets/issues/7956/comments | value:I_kwDODunzps7k08AC | value:open | value:2 | value:2026-01-22T09:38:38Z | value:https://api.github.com/repos/huggingface/datasets/issues/7956/labels{/name} | value:7956 | json:{"login": "pavanramkumar", "id": 3664715, "node_id": "MDQ6VXNlcjM2NjQ3MTU=", "avatar_url": "https://avatars.githubusercontent.com/u/3664715?v=4", "gravatar_id": "", "url": "https://api.github.com/users/pavanramkumar", "html_url": "https://github.com/pavanramkumar", "followers_url": "https://api.github.com/users/pa... | true | |||||||||||
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This fix adds a specific branch to ha... | value:https://api.github.com/repos/huggingface/datasets/issues/7955/comments | value:PR_kwDODunzps6-Y-EL | value:closed | value:1 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7955", "html_url": "https://github.com/huggingface/datasets/pull/7955", "diff_url": "https://github.com/huggingface/datasets/pull/7955.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7955.patch", "merged_at": "2026-01-23T16:08:39Z"} | value:2026-01-24T02:55:56Z | value:https://api.github.com/repos/huggingface/datasets/issues/7955/labels{/name} | value:7955 | json:{"login": "prathamk-tw", "id": 205576963, "node_id": "U_kgDODEDbAw", "avatar_url": "https://avatars.githubusercontent.com/u/205576963?v=4", "gravatar_id": "", "url": "https://api.github.com/users/prathamk-tw", "html_url": "https://github.com/prathamk-tw", "followers_url": "https://api.github.com/users/prathamk-tw/... | value:False | true | |||||||||
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>>> from datasets import Dataset, interleave_datasets
>>> d1 = Dataset.from_dict({"a": [0, 1, 2]})
>>> d2 = Dataset.from_dict({"a": [10, 11, 12, 13]})
>>> d3 = Dataset.from_dict({"a": [20, 21, 22]})
>>> dataset = interleave_datasets([d1, d2, d3], stopping_strategy="all_exhausted_without_repl... | value:https://api.github.com/repos/huggingface/datasets/issues/7954/comments | value:I_kwDODunzps7ktEe5 | value:closed | value:2 | value:2026-03-23T14:03:13Z | value:https://api.github.com/repos/huggingface/datasets/issues/7954/labels{/name} | value:7954 | json:{"login": "prathamk-tw", "id": 205576963, "node_id": "U_kgDODEDbAw", "avatar_url": "https://avatars.githubusercontent.com/u/205576963?v=4", "gravatar_id": "", "url": "https://api.github.com/users/prathamk-tw", "html_url": "https://github.com/prathamk-tw", "followers_url": "https://api.github.com/users/prathamk-tw/... | true | ||||||||
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Note: Local pytest errors on Python 3.13 due to removal of `distutils` are unrelated to this change.
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Note: Local pytest errors on Python 3.13 due to removal of `distutils` are unrelated to this change.
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Add native support for loading GenBank (.gb, .gbk, .genbank) files, a standard format for biological sequence data with annotations maintained by NCBI.
## Changes
- Add `genbank` packaged module with pure Python state machine parser
- Register GenBank extensions in `_PACKAGED_DATASETS_MODULES` and `_E... | value:https://api.github.com/repos/huggingface/datasets/issues/7951/comments | value:PR_kwDODunzps6951bw | value:closed | value:9 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7951", "html_url": "https://github.com/huggingface/datasets/pull/7951", "diff_url": "https://github.com/huggingface/datasets/pull/7951.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7951.patch", "merged_at": "2026-09-11T10:30:09Z"} | value:2026-09-11T10:30:09Z | value:https://api.github.com/repos/huggingface/datasets/issues/7951/labels{/name} | value:7951 | json:{"login": "behroozazarkhalili", "id": 80390531, "node_id": "MDQ6VXNlcjgwMzkwNTMx", "avatar_url": "https://avatars.githubusercontent.com/u/80390531?v=4", "gravatar_id": "", "url": "https://api.github.com/users/behroozazarkhalili", "html_url": "https://github.com/behroozazarkhalili", "followers_url": "https://api.gi... | value:False | true | |||||||||
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Updated the Lance integration docs to match the official dataset cards and expand coverage of multimodal workflows in `use_with_lance.mdx`.
## Details
- Added a Lance format-focused guidance page for multimodal examples:
- Stream from the Hub via `datasets` API
- Use Lance's dataset AP... | value:https://api.github.com/repos/huggingface/datasets/issues/7950/comments | value:PR_kwDODunzps69zsW1 | value:closed | value:5 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7950", "html_url": "https://github.com/huggingface/datasets/pull/7950", "diff_url": "https://github.com/huggingface/datasets/pull/7950.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7950.patch", "merged_at": "2026-01-23T16:16:43Z"} | value:2026-01-23T16:40:20Z | value:https://api.github.com/repos/huggingface/datasets/issues/7950/labels{/name} | value:7950 | json:{"login": "prrao87", "id": 35005448, "node_id": "MDQ6VXNlcjM1MDA1NDQ4", "avatar_url": "https://avatars.githubusercontent.com/u/35005448?v=4", "gravatar_id": "", "url": "https://api.github.com/users/prrao87", "html_url": "https://github.com/prrao87", "followers_url": "https://api.github.com/users/prrao87/followers"... | value:False | true | |||||||||
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When enabled, a new `file_name` column is added containing the source file name
for each row. Default behavior is unchanged.
Changes:
- Add `return_file_name` to JsonConfig
- Append file name during JSON table generation
-... | value:https://api.github.com/repos/huggingface/datasets/issues/7948/comments | value:PR_kwDODunzps69vnHh | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7948", "html_url": "https://github.com/huggingface/datasets/pull/7948", "diff_url": "https://github.com/huggingface/datasets/pull/7948.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7948.patch", "merged_at": null} | value:2026-01-17T05:39:43Z | value:https://api.github.com/repos/huggingface/datasets/issues/7948/labels{/name} | value:7948 | json:{"login": "Sachin-0001", "id": 168210869, "node_id": "U_kgDOCgaxtQ", "avatar_url": "https://avatars.githubusercontent.com/u/168210869?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Sachin-0001", "html_url": "https://github.com/Sachin-0001", "followers_url": "https://api.github.com/users/Sachin-0001/... | value:False | true | |||||||||||
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When getting the config names of `cais/mmlu` in online mode, it provides the different subjects and `all` but in offline mode is provides `default` even with cached version of the dataset.
### Steps to reproduce the bug
1. First download dataset in online mode so that it is cached:
```
$ H... | value:https://api.github.com/repos/huggingface/datasets/issues/7947/comments | value:I_kwDODunzps7j4xPb | value:open | value:0 | value:2026-01-16T19:20:08Z | value:https://api.github.com/repos/huggingface/datasets/issues/7947/labels{/name} | value:7947 | json:{"login": "rikrd", "id": 15324, "node_id": "MDQ6VXNlcjE1MzI0", "avatar_url": "https://avatars.githubusercontent.com/u/15324?v=4", "gravatar_id": "", "url": "https://api.github.com/users/rikrd", "html_url": "https://github.com/rikrd", "followers_url": "https://api.github.com/users/rikrd/followers", "following_url":... | true | |||||||||||
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Hi! I frequently work with large image datasets (100k-300k+ samples) and found that `dataset.push_to_hub()` can be quite slow.
cc @lhoestq - would love your thoughts on this!
I experimented with a... | value:https://api.github.com/repos/huggingface/datasets/issues/7946/comments | value:I_kwDODunzps7jjSZ2 | value:open | value:4 | value:2026-01-17T13:27:20Z | value:https://api.github.com/repos/huggingface/datasets/issues/7946/labels{/name} | value:7946 | json:{"login": "adithya-s-k", "id": 27956426, "node_id": "MDQ6VXNlcjI3OTU2NDI2", "avatar_url": "https://avatars.githubusercontent.com/u/27956426?v=4", "gravatar_id": "", "url": "https://api.github.com/users/adithya-s-k", "html_url": "https://github.com/adithya-s-k", "followers_url": "https://api.github.com/users/adithy... | true | |||||||||||
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```python
from datasets import load_dataset_builder, StreamingDownloadManager
dlm = StreamingDownloadManager()
def get_shards(dataset_name, *args, **kwargs):
b = load_dataset_builder(dataset_name, *args, **kwargs)
splits = b._split_generators(dlm)
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Datasets requires Python 3.9+ (since PR #7474).
There's some dill specific code branches checking for earlier versions of python which can be removed. | value:https://api.github.com/repos/huggingface/datasets/issues/7941/comments | value:PR_kwDODunzps684EZa | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7941", "html_url": "https://github.com/huggingface/datasets/pull/7941", "diff_url": "https://github.com/huggingface/datasets/pull/7941.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7941.patch", "merged_at": null} | value:2026-01-13T08:44:31Z | value:https://api.github.com/repos/huggingface/datasets/issues/7941/labels{/name} | value:7941 | json:{"login": "tboerstad", "id": 4872288, "node_id": "MDQ6VXNlcjQ4NzIyODg=", "avatar_url": "https://avatars.githubusercontent.com/u/4872288?v=4", "gravatar_id": "", "url": "https://api.github.com/users/tboerstad", "html_url": "https://github.com/tboerstad", "followers_url": "https://api.github.com/users/tboerstad/foll... | value:False | true | |||||||||||
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This PR improves the readability and maintainability of the indexing integration tests by adding clear, detailed comments throughout the test suite.
### Motivation
The indexing tests cover multiple backends (FAISS and Elasticsearch) and involve non-trivial workflows such as vector creation, index... | value:https://api.github.com/repos/huggingface/datasets/issues/7940/comments | value:PR_kwDODunzps682sBj | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7940", "html_url": "https://github.com/huggingface/datasets/pull/7940", "diff_url": "https://github.com/huggingface/datasets/pull/7940.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7940.patch", "merged_at": null} | value:2026-01-13T06:42:07Z | value:https://api.github.com/repos/huggingface/datasets/issues/7940/labels{/name} | value:7940 | json:{"login": "DeeptiAgarwal16", "id": 115862867, "node_id": "U_kgDOBuftUw", "avatar_url": "https://avatars.githubusercontent.com/u/115862867?v=4", "gravatar_id": "", "url": "https://api.github.com/users/DeeptiAgarwal16", "html_url": "https://github.com/DeeptiAgarwal16", "followers_url": "https://api.github.com/users/... | value:False | true | |||||||||||
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This is tangentially related to [https://github.com/huggingface/datasets/issues/7918](https://github.com/huggingface/datasets/issues/7918).
When loading a dataset with > 16 files a progress bar is shown (unless stdout is redirected or [https://github.com/huggingface/datasets/pull/7919](https... | value:https://api.github.com/repos/huggingface/datasets/issues/7939/comments | value:I_kwDODunzps7i6IeO | value:open | value:0 | value:2026-06-28T23:30:45Z | value:https://api.github.com/repos/huggingface/datasets/issues/7939/labels{/name} | value:7939 | json:{"login": "Tommigun1980", "id": 60286968, "node_id": "MDQ6VXNlcjYwMjg2OTY4", "avatar_url": "https://avatars.githubusercontent.com/u/60286968?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Tommigun1980", "html_url": "https://github.com/Tommigun1980", "followers_url": "https://api.github.com/users/Tom... | true | |||||||||||
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```python
import logging
logging.basicConfig(level=logging.WARNING)
from datasets.utils.logging import get_logger
get_logger("datasets.load").warning("This appears twice")
```
Outputs:
```
This ap... | value:https://api.github.com/repos/huggingface/datasets/issues/7937/comments | value:PR_kwDODunzps68pBId | value:open | value:0 | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/7937", "html_url": "https://github.com/huggingface/datasets/pull/7937", "diff_url": "https://github.com/huggingface/datasets/pull/7937.diff", "patch_url": "https://github.com/huggingface/datasets/pull/7937.patch", "merged_at": null} | value:2026-01-13T08:10:24Z | value:https://api.github.com/repos/huggingface/datasets/issues/7937/labels{/name} | value:7937 | json:{"login": "tboerstad", "id": 4872288, "node_id": "MDQ6VXNlcjQ4NzIyODg=", "avatar_url": "https://avatars.githubusercontent.com/u/4872288?v=4", "gravatar_id": "", "url": "https://api.github.com/users/tboerstad", "html_url": "https://github.com/tboerstad", "followers_url": "https://api.github.com/users/tboerstad/foll... | value:False | true | |||||||||||
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I'm trying to use `load_dataset` to construct a dataset that read parquet data on HDFS streamingly, like
```python
ds = load_dataset(
"parquet",
data_files={
"train": "hdfs://xxx/train*.parquet",
"test": "hdfs://xxx/test*.parquet"
},
streaming=True,
)
```
I en... | value:https://api.github.com/repos/huggingface/datasets/issues/7936/comments | value:I_kwDODunzps7iPo1_ | value:closed | value:7 | value:2026-01-14T13:47:50Z | value:https://api.github.com/repos/huggingface/datasets/issues/7936/labels{/name} | value:7936 | json:{"login": "li-yi-dong", "id": 73142299, "node_id": "MDQ6VXNlcjczMTQyMjk5", "avatar_url": "https://avatars.githubusercontent.com/u/73142299?v=4", "gravatar_id": "", "url": "https://api.github.com/users/li-yi-dong", "html_url": "https://github.com/li-yi-dong", "followers_url": "https://api.github.com/users/li-yi-don... | true |
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