Dataset Viewer
Auto-converted to Parquet Duplicate
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https://api.github.com/repos/huggingface/datasets/issues/8049
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https://github.com/huggingface/datasets/pull/8049
4,032,135,159
PR_kwDODunzps7IZR_m
8,049
Fix typos in iterable_dataset.py
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2026-03-06T04:20:52
2026-03-06T04:21:10
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Fixes #8038
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4,031,613,102
I_kwDODunzps7wTYiu
8,048
Support 3D Datasets
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2026-03-06T01:23:08
2026-03-06T11:57:06
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### Feature request In `datasets` library we have options to load `image` and `audio` datasets which can be viewed in the Dataset Viewer. LIKE: ```bash from datasets import load_dataset, Image from datasets import load_dataset, Audio ``` > https://huggingface.co/docs/datasets/en/image_load & https://huggingface.co/do...
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https://api.github.com/repos/huggingface/datasets/issues/8047
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4,030,434,134
PR_kwDODunzps7IUKWg
8,047
fix: handle nested null types in feature alignment for multi-proc map
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2026-03-05T20:28:50
2026-03-05T20:29:41
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When using `Dataset.map()` with `num_proc > 1`, shards containing only empty lists get their features inferred as `List(Value('null'))`, which is incompatible with `List(Struct({...}))` from shards with actual data. The existing `_check_if_features_can_be_aligned` and `_align_features` only handled top-level `Value(...
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4,030,348,328
I_kwDODunzps7wOjwo
8,046
`Dataset.map()` with `num_proc > 1` fails when some shards produce `List(Value('null'))` (empty lists)
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[ "\n### Root cause\n\nIn `src/datasets/features/features.py`, both `_check_if_features_can_be_aligned` and `_align_features` use:\n\n```python\nisinstance(v, Value) and v.dtype == \"null\"\n```\n\nto check for null compatibility. However, `List(Value('null'))` is **not** an instance of `Value` — it's an instance of ...
2026-03-05T20:12:13
2026-03-05T20:12:35
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### Describe the bug When using `Dataset.map()` with `num_proc > 1`, if the map function produces a list column where some shards contain only empty lists `[]` and other shards contain non-empty lists of structs, the feature type inference is inconsistent across shards: - Shards with only empty lists → `List(Value('n...
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https://github.com/huggingface/datasets/pull/8045
4,028,881,818
PR_kwDODunzps7IPA1N
8,045
Write IterableDataset to parquet incrementally instead of materializing entire shard in memory
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[ "I've tested this change along with the changes from my other PRs (https://github.com/HaukurPall/datasets/tree/all-fixes) and this change **dramatically** reduces the memory requirement per process.\r\n\r\nContext:\r\n\r\nI'm working with audio datasets, the audio is embedded in the parquet. When loading a 1GB shar...
2026-03-05T15:13:53
2026-03-06T11:47:00
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`IterableDataset.to_parquet()` materialized the entire shard into memory via `pa.concat_tables(list(...))` before writing. For datasets with large shards and multiprocessing (push_to_hub with num_proc > 0) the memory requirements can be really large. This PR writes parquet incrementally by iterating Arrow batches a...
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https://api.github.com/repos/huggingface/datasets/issues/8044
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4,028,042,275
PR_kwDODunzps7IMNl4
8,044
Fix silent data loss in push_to_hub when num_proc > num_shards
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2026-03-05T12:52:39
2026-03-05T12:52:39
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## Summary When `num_proc` exceeds the number of output shards in `Dataset.push_to_hub`, workers without assigned output shards silently drop their data. The metadata still reports the correct dataset length (using `len(self[split])`), masking the data loss. This fix caps `num_jobs` at `num_shards` in `_push_pa...
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4,027,936,170
PR_kwDODunzps7IL3IJ
8,043
Add features parameter to IterableDatasetDict.map
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2026-03-05T12:30:46
2026-03-05T12:30:46
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IterableDataset.map accepts a features parameter to declare the output schema, but IterableDatasetDict.map did not expose it. This meant users of IterableDatasetDict had no way to preserve feature metadata through map operations.
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4,027,903,841
PR_kwDODunzps7ILwT5
8,042
Fix schema enforcement in streaming _convert_to_arrow
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2026-03-05T12:23:47
2026-03-05T12:23:47
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When the iter_arrow chain is broken (e.g. after .map() without with_format("arrow")), _convert_to_arrow falls back to pa.Table.from_pylist() which infers types from values. If early batches contain None or empty lists, Arrow infers null/list<null> types that conflict with later batches containing real data, causing Arr...
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4,027,152,089
PR_kwDODunzps7IJPKo
8,041
Use num_examples instead of len(self) for iterable_dataset's SplitInfo
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2026-03-05T09:54:26
2026-03-05T09:54:26
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Fixes a bug (crash) when pushing individual splits to a repo which has pre-existing data.
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4,025,912,223
PR_kwDODunzps7IFFnG
8,040
Fix the logic for allowed extensions when creating build configurations (#8034)
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2026-03-05T05:32:45
2026-03-05T05:32:45
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see #8034
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4,025,811,123
PR_kwDODunzps7IEv9Z
8,039
Fix non-deterministic by sorting metadata extensions (#8034)
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2026-03-05T05:07:50
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see #8034
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4,020,184,168
I_kwDODunzps7vnyRo
8,038
Typo in iterable_dataset.py
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2026-03-04T05:37:15
2026-03-04T05:37:15
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### Describe the bug `streaming=True**kwargs,` should be `streaming=True, **kwargs,` https://github.com/huggingface/datasets/blob/81027be09d5cd9f06a6d64ef1a8a3e9ebd0f86fd/src/datasets/iterable_dataset.py#L2950 ### Steps to reproduce the bug ``` from Datasets import Dataset IterableDataset.from_csv("file.csv") ``` #...
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4,008,928,790
I_kwDODunzps7u82YW
8,037
IterableDataset.filter() chaining fails due to features being lost when is_typed=True
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2026-03-02T02:30:24
2026-03-02T02:30:24
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### Describe the bug 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 = FormattedExamplesIterable( ...
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PR_kwDODunzps7HHMKn
8,036
follow `cache_dir` in download option when loading datasets
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2026-03-01T10:56:18
2026-03-01T10:56:18
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fixes #8029
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8,035
Update links in README to use markdown format
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2026-02-28T23:16:20
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I_kwDODunzps7uqxFr
8,034
[BUG] load_datasets() cannot use the generated Arrow cache correctly
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[ "PYTHONHASHSEED=1 uv run python -c\n \"\nfrom datasets.load import LocalDatasetModuleFactory\nmod = LocalDatasetModuleFactory('/cache/datasets/imagenet-1k')\ndm = mod.get_module()\nprint('Hash:', dm.hash)\n\"\nResolving data files: 100%|█████████| 294/294 [00:00<00:00, 20584.68it/s]\nResolving data files: 100%|████...
2026-02-28T08:11:23
2026-03-04T13:50:08
null
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NONE
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### Describe the bug 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. ### S...
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PR_kwDODunzps7G-QP1
8,033
perf: use deque for async map task/index queues
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[ "The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8033). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.", "Friendly ping — CI is green and this is ready for review. Happy to address any feedback...
2026-02-28T05:07:00
2026-02-28T21:32:44
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## Problem `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 `indi...
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set dev version
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release: 4.6.1
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Remove tmp file in push to hub
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reported in https://github.com/huggingface/datasets/pull/7979#issuecomment-3973374484
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`cache_dir` option in `download_config` in `load_dataset` is not respected
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[ "Actually, I used debugger to step into the code of `datasets`, and found `load_dataset` calls into `cached_path`, where it calls into `hf_hub_download` method for `hf://` links:\nhttps://github.com/huggingface/datasets/blob/6e8eaeed4d202b72eff44ba1a9ec5b7d81d2d3e6/src/datasets/utils/file_utils.py#L182-L195\n\nSome...
2026-02-27T16:05:30
2026-02-27T23:34:28
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### Describe the bug 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,允许使用代理 ''' ...
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Fix torchcodec audio decoding to respect 'num_channels'
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Fixes torchcodec audio decoding when `num_channels` is set on `Audio`. 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; - mono output ...
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Add `Json()` type
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`Json()` type is needed when some fields don't have fixed types, e.g. "tools" and "tool_calls" types in conversation + tool calling datasets like [dataclaw](https://huggingface.co/datasets?other=dataclaw) datasets. Cc @peteromallet and @woctordho @Nanbeige for viz Examples of supported tool-calling / dataclaw datase...
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fix: resolve base_path conflict between builder_kwargs and config_kwargs
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## What does this PR fix? 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_tomatoes"...
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progress bar optional manual control
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[ "Hi @lhoestq ,\r\nCan you please trigger the CI CD pipeline ?", "The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8021). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.", "@lhoestq I have appli...
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Fix: https://github.com/huggingface/datasets/issues/7939 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 enable or...
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feat: add return_file_name support to Parquet packaged builder
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Part of #5806. Extends the `return_file_name` feature (implemented for JSON in #7948 and CSV in #8019) to the Parquet packaged builder. When `return_file_name=True`, a `file_name` column containing the source file basename is appended to each batch.
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feat: add return_file_name support to CSV packaged builder
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## Summary - 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 ## Mot...
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Improve error message for deprecated dataset scripts with migration guidance
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[ "Hi team! I’m just checking in on this PR to see if there is any additional information or documentation I can provide to help with the review process. Thanks for your time!" ]
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Summary 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 migration step...
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3,974,759,572
PR_kwDODunzps7FecuC
8,016
Remove legacy Sphinx roles from docstrings
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2026-02-22T15:06:33
2026-02-23T16:10:21
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## Summary 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 Sphinx ...
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3,974,281,900
I_kwDODunzps7s4rqs
8,015
Iterating a streaming dataset correctly in random order
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[ "Hi, reshuffling is actually pretty easy:\n\n```python\n\"\"\" shuffle.py \"\"\"\nfrom datasets import load_dataset\n\nnum_proc = 8 # tweak it here depending on your machine\nseed = 42\nds = load_dataset(\"jackyhate/text-to-image-2M\", num_proc=num_proc)\nds = ds.shuffle(seed=seed)\nds.push_to_hub(\"my-username/te...
2026-02-22T11:34:06
2026-02-26T18:09:27
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### Describe the bug 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 ``` **Shuffle*...
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8,014
Speed up local 'get_data_patterns' by avoiding repeated recursive scans
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[ "The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8014). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.", "> lgtm ! can you run `make style` to fix the CI before we merge ?\r\n\r\ndone. All good...
2026-02-21T14:11:40
2026-02-25T20:07:50
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This PR speeds up `get_data_patterns` for local paths. ### 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 reported b...
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3,964,156,070
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8,013
Add space between sentences 'operation.To debug'
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2026-02-19T17:31:56
2026-02-19T17:31:56
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Previously the exception message would read "...abruptly died during map _operation.To_ debug the error...". The `operation.To` part would actually render as a hyperlink when printed to Slack.
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3,963,855,875
I_kwDODunzps7sQ6QD
8,012
HC3 dataset fails to load with datasets>=3 due to legacy script (HC3.py)
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[ "This is not a bug. This is intended behaviour. The only ways to resolve this are\n1. use the old `datasets` versions\n2. load the dataset and upload it to your own repo without a script\n3. raise an issue in the dataset and wait for the owner to update it." ]
2026-02-19T16:27:51
2026-02-20T11:58:20
2026-02-20T11:58:20
null
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### Describe the bug 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 parqu...
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PR_kwDODunzps7E59Pn
8,011
fix: condition for file_name feature check
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[ "Hi @lhoestq, have proposed a fix for [#8010](https://github.com/huggingface/datasets/issues/8010)" ]
2026-02-19T15:12:31
2026-02-19T15:29:29
2026-02-19T15:29:29
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## Description 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 is infe...
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3,963,448,558
I_kwDODunzps7sPWzu
8,010
audiofolder / folder-based loader rejects metadata.csv when file_name column is inferred as large_string
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[ "Proposing a PR for this [here](https://github.com/huggingface/datasets/pull/8011)\n\nPS: I didn't find a contributing documentation. Please recommend any changes in issue or PR if any. Thank you!" ]
2026-02-19T15:06:09
2026-02-19T15:29:41
2026-02-19T15:29:41
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### Describe the bug 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 colum...
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8,009
More IterableDataset.from_x methods and docs and polars.Lazyframe support
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[ "The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8009). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update." ]
2026-02-18T14:48:39
2026-02-18T15:18:17
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8,008
fix: prevent duplicate keywords in load_dataset_builder (#4910)
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2026-02-16T17:42:30
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3,946,695,329
I_kwDODunzps7rPcqh
8,007
Add option for loading audio with video
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[ "Hi,\nI’m interested in working on this issue.\n\nFrom what I understand, audio decoding would involve an AudioDecoder, and previous discussions have suggested handling it separately. I’d like to explore whether integrating audio extraction in relation to the current video decoding workflow would be appropriate, or...
2026-02-16T09:11:02
2026-02-16T15:56:21
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### Describe the bug 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` para...
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8,006
Regression: from_generator crashes if one generator call returns no results
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2026-02-15T16:16:48
2026-02-24T13:58:12
2026-02-24T13:58:12
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CONTRIBUTOR
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### Describe the bug 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 worked fi...
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3,941,908,297
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8,005
Multi-channel audio is automatically cast to mono, num_channels is ignored
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[ "**Workaround**\nDirectly load audio using torchcodec, this is what datasets does under the hood (but doesn't maintain multi-channel)\n\n```python\nimport torchcodec\n\ndecoder = torchcodec.decoders.AudioDecoder(audio[\"bytes\"])\naudio_samples = decoder.get_all_samples()\n\naudio = audio_samples.data.numpy()\nsamp...
2026-02-14T17:28:03
2026-02-25T15:17:18
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### Describe the bug 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 impor...
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8,004
fix save_to_disk/load_from_disk with pathlib.Path input
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2026-02-13T23:03:55
2026-02-13T23:03:55
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Since #6704, `save_to_disk` and `load_from_disk` use `fsspec.core.url_to_fs` which expects a `str`, but both methods accept `PathLike` (which includes `pathlib.Path`). Passing a `Path` object raises a `TypeError` because `url_to_fs` can't handle it. Fixed by converting the path argument with `os.fspath()` before handi...
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very basic support for more hf urls
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[ "The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/datasets/pr_8003). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update." ]
2026-02-13T18:30:56
2026-02-13T18:47:58
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