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A local file with the same name as a WebDataset member can replace the embedded image. When an `Image` dictionary supplies both a relative archive label and bytes, the encoder can discard the bytes if the label happens to resolve to a file in the working directory.
Keep the relative label and the sup... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8982 | json:[] | value:8982 | value:fix(image): keep bytes for relative archive labels | value:6290882341 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8982/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8982", "html_url": "https://github.com/huggingface/datasets/pull/8982", "diff_url": "https://github.com/huggingface/datasets/pull/8982.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8982.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8982/events | value:2026-11-09T17:11:01Z | value:https://api.github.com/repos/huggingface/datasets/issues/8982/labels{/name} | json:[] | value:NONE | value:2026-11-09T17:11:01Z | json:{"login": "GoldArowana", "id": 27399349, "node_id": "MDQ6VXNlcjI3Mzk5MzQ5", "avatar_url": "https://avatars.githubusercontent.com/u/27399349?v=4", "gravatar_id": "", "url": "https://api.github.com/users/GoldArowana", "html_url": "https://github.com/GoldArowana", "followers_url": "https://api.github.com/users/GoldAr... | value:PR_kwDODunzps8AAAABN5v5xw | true | |||||||||||
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Adding a column to an Arrow-, pandas-, or Polars-formatted `IterableDataset` currently raises `TypeError` during iteration because the internal callback returns a dictionary. Perform this operation in batched Arrow format, append the new column without discarding the original columns, and restore th... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8981 | json:[] | value:8981 | value:Fix IterableDataset.add_column with table formats | value:6274148965 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8981/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8981", "html_url": "https://github.com/huggingface/datasets/pull/8981", "diff_url": "https://github.com/huggingface/datasets/pull/8981.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8981.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8981/events | value:2026-11-08T18:26:32Z | value:https://api.github.com/repos/huggingface/datasets/issues/8981/labels{/name} | json:[] | value:NONE | value:2026-11-08T18:26:32Z | json:{"login": "FOWEPJF255", "id": 270070255, "node_id": "U_kgDOEBjx7w", "avatar_url": "https://avatars.githubusercontent.com/u/270070255?v=4", "gravatar_id": "", "url": "https://api.github.com/users/FOWEPJF255", "html_url": "https://github.com/FOWEPJF255", "followers_url": "https://api.github.com/users/FOWEPJF255/foll... | value:PR_kwDODunzps8AAAABNsYR6g | true | |||||||||||
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`IterableDataset.add_column()` fails during iteration after `with_format("arrow")`, `with_format("pandas")`, or `with_format("polars")`. Adding the column before selecting the format works. This prevents a streaming data preparation pipeline from adding metadata columns after it has selected... | value:https://api.github.com/repos/huggingface/datasets/issues/8980 | json:[] | value:8980 | value:IterableDataset.add_column fails with arrow, pandas and polars formats | value:6274107647 | json:[] | json:{"blocked_by": 0, "total_blocked_by": 0, "blocking": 0, "total_blocking": 0} | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8980/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | value:https://api.github.com/repos/huggingface/datasets/issues/8980/events | value:2026-11-08T18:21:59Z | value:https://api.github.com/repos/huggingface/datasets/issues/8980/labels{/name} | json:[{"login": "FOWEPJF255", "id": 270070255, "node_id": "U_kgDOEBjx7w", "avatar_url": "https://avatars.githubusercontent.com/u/270070255?v=4", "gravatar_id": "", "url": "https://api.github.com/users/FOWEPJF255", "html_url": "https://github.com/FOWEPJF255", "followers_url": "https://api.github.com/users/FOWEPJF255/fol... | value:NONE | value:2026-11-08T18:22:19Z | json:{"login": "FOWEPJF255", "id": 270070255, "node_id": "U_kgDOEBjx7w", "avatar_url": "https://avatars.githubusercontent.com/u/270070255?v=4", "gravatar_id": "", "url": "https://api.github.com/users/FOWEPJF255", "html_url": "https://github.com/FOWEPJF255", "followers_url": "https://api.github.com/users/FOWEPJF255/foll... | value:I_kwDODunzps8AAAABdfdI_w | true | ||||||||||
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```python
from datasets import IterableDataset
ds = IterableDataset.from_dict({"a": [1, 2, 3], "b": ["x", "y", "z"]})
list(ds.with_format("arrow").rename_column("a",... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8977 | json:[] | value:8977 | value:Fix IterableDataset.rename_columns with arrow, pandas and polars formats | value:6266654536 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8977/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8977", "html_url": "https://github.com/huggingface/datasets/pull/8977", "diff_url": "https://github.com/huggingface/datasets/pull/8977.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8977.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8977/events | value:2026-11-08T02:17:41Z | value:https://api.github.com/repos/huggingface/datasets/issues/8977/labels{/name} | json:[] | value:NONE | value:2026-11-08T02:17:41Z | json:{"login": "assass1nlike", "id": 326038984, "node_id": "U_kgDOE271yA", "avatar_url": "https://avatars.githubusercontent.com/u/326038984?v=4", "gravatar_id": "", "url": "https://api.github.com/users/assass1nlike", "html_url": "https://github.com/assass1nlike", "followers_url": "https://api.github.com/users/assass1nl... | value:PR_kwDODunzps8AAAABNmnIdQ | true | |||||||||||
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cc @lhoestq | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8976 | json:[] | value:8976 | value:Fix mixed-type JSON fields with slashes in their names | value:6266442521 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8976/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8976", "html_url": "https://github.com/huggingface/datasets/pull/8976", "diff_url": "https://github.com/huggingface/datasets/pull/8976.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8976.patch", "merged_at": "2026-11-09T17:28:50Z"} | value:https://api.github.com/repos/huggingface/datasets/issues/8976/events | value:2026-11-08T01:49:10Z | value:https://api.github.com/repos/huggingface/datasets/issues/8976/labels{/name} | json:[] | value:CONTRIBUTOR | value:2026-11-09T17:28:50Z | json:{"login": "its-amann", "id": 163747435, "node_id": "U_kgDOCcKWaw", "avatar_url": "https://avatars.githubusercontent.com/u/163747435?v=4", "gravatar_id": "", "url": "https://api.github.com/users/its-amann", "html_url": "https://github.com/its-amann", "followers_url": "https://api.github.com/users/its-amann/follower... | value:PR_kwDODunzps8AAAABNmcdng | true | |||||||||
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\get_parquet_column_options\ applied a single top-level \
equire_storage_embed\
result to every leaf under a struct field, disabling compression and dictionary
encoding for non-media columns whenever a media feature was present. Compute the
embed flag per leaf based on its own feature.
This pull req... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8975 | json:[] | value:8975 | value:Fix Parquet compression disabled for all columns in structs containing media | value:6266254101 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8975/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8975", "html_url": "https://github.com/huggingface/datasets/pull/8975", "diff_url": "https://github.com/huggingface/datasets/pull/8975.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8975.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8975/events | value:2026-11-08T01:21:44Z | value:https://api.github.com/repos/huggingface/datasets/issues/8975/labels{/name} | json:[] | value:NONE | value:2026-11-08T01:21:44Z | json:{"login": "davrens101", "id": 166565828, "node_id": "U_kgDOCe2XxA", "avatar_url": "https://avatars.githubusercontent.com/u/166565828?v=4", "gravatar_id": "", "url": "https://api.github.com/users/davrens101", "html_url": "https://github.com/davrens101", "followers_url": "https://api.github.com/users/davrens101/foll... | value:PR_kwDODunzps8AAAABNmTHlw | true | |||||||||||
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### Context & Problem
In #8674, Parquet writer options (`compression`, `use_dictionary`, `column_encoding`) were keyed by leaf path rather than top-level column names so nested struct/list fields would be compressed.
However, `get_parquet_column_options` still checked `require_storage_embed` only a... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8974 | json:[] | value:8974 | value:Compress nested non-media columns in Parquet writer alongside media features | value:6266018236 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8974/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8974", "html_url": "https://github.com/huggingface/datasets/pull/8974", "diff_url": "https://github.com/huggingface/datasets/pull/8974.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8974.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8974/events | value:2026-11-08T00:50:48Z | value:https://api.github.com/repos/huggingface/datasets/issues/8974/labels{/name} | json:[] | value:NONE | value:2026-11-08T00:50:48Z | json:{"login": "davrens101", "id": 166565828, "node_id": "U_kgDOCe2XxA", "avatar_url": "https://avatars.githubusercontent.com/u/166565828?v=4", "gravatar_id": "", "url": "https://api.github.com/users/davrens101", "html_url": "https://github.com/davrens101", "followers_url": "https://api.github.com/users/davrens101/foll... | value:PR_kwDODunzps8AAAABNmHV5w | true | |||||||||||
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When a dataset contains a struct or dictionary column that includes an embedded storage feature (such as `Image`, `Audio`, `Video`, etc.) alongside non-media columns (such as text strings, integers, floats, or vectors), saving the dataset to Parquet via `to_parquet()` or `push_to_hub()` disa... | value:https://api.github.com/repos/huggingface/datasets/issues/8973 | json:[] | value:8973 | value:Parquet writer disables compression for non-media columns in structs containing an Image or Audio feature | value:6266008854 | json:[] | json:{"blocked_by": 0, "total_blocked_by": 0, "blocking": 0, "total_blocking": 0} | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8973/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | value:https://api.github.com/repos/huggingface/datasets/issues/8973/events | value:2026-11-08T00:49:28Z | value:https://api.github.com/repos/huggingface/datasets/issues/8973/labels{/name} | json:[{"login": "davrens101", "id": 166565828, "node_id": "U_kgDOCe2XxA", "avatar_url": "https://avatars.githubusercontent.com/u/166565828?v=4", "gravatar_id": "", "url": "https://api.github.com/users/davrens101", "html_url": "https://github.com/davrens101", "followers_url": "https://api.github.com/users/davrens101/fol... | value:NONE | value:2026-11-08T00:49:45Z | json:{"login": "davrens101", "id": 166565828, "node_id": "U_kgDOCe2XxA", "avatar_url": "https://avatars.githubusercontent.com/u/166565828?v=4", "gravatar_id": "", "url": "https://api.github.com/users/davrens101", "html_url": "https://github.com/davrens101", "followers_url": "https://api.github.com/users/davrens101/foll... | value:I_kwDODunzps8AAAABdXu1Fg | true | ||||||||||
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```python
from datasets import load_dataset
load_dataset("eval", data_files="swe_benc... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8972 | json:[] | value:8972 | value:Fix the eval loader for string sample ids | value:6265890421 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8972/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8972", "html_url": "https://github.com/huggingface/datasets/pull/8972", "diff_url": "https://github.com/huggingface/datasets/pull/8972.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8972.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8972/events | value:2026-11-08T00:34:34Z | value:https://api.github.com/repos/huggingface/datasets/issues/8972/labels{/name} | json:[] | value:NONE | value:2026-11-08T11:13:13Z | json:{"login": "aidxhxr", "id": 93529551, "node_id": "U_kgDOBZMlzw", "avatar_url": "https://avatars.githubusercontent.com/u/93529551?v=4", "gravatar_id": "", "url": "https://api.github.com/users/aidxhxr", "html_url": "https://github.com/aidxhxr", "followers_url": "https://api.github.com/users/aidxhxr/followers", "follo... | value:PR_kwDODunzps8AAAABNmA7Ag | true | |||||||||||
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The Hub loading guide now shows where to find the Dataset Viewer’s **Auto-converted to Parquet** link and how to load one split from the conversion branch. The example uses the same CSV dataset already introduced in the guide and links to the Hub documentation for partial conversions and API access... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8970 | json:[] | value:8970 | value:Document how to load Parquet files from the Dataset Viewer | value:6261052761 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8970/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8970", "html_url": "https://github.com/huggingface/datasets/pull/8970", "diff_url": "https://github.com/huggingface/datasets/pull/8970.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8970.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8970/events | value:2026-11-07T15:48:21Z | value:https://api.github.com/repos/huggingface/datasets/issues/8970/labels{/name} | json:[] | value:NONE | value:2026-11-07T15:48:21Z | json:{"login": "Lizidong01", "id": 61378198, "node_id": "MDQ6VXNlcjYxMzc4MTk4", "avatar_url": "https://avatars.githubusercontent.com/u/61378198?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Lizidong01", "html_url": "https://github.com/Lizidong01", "followers_url": "https://api.github.com/users/Lizidong0... | value:PR_kwDODunzps8AAAABNiOk8g | true | |||||||||||
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Fixes #8967
`Dataset.map(num_proc=...)` with a `suffix_template` whose rank field is not exactly `{rank:05d}` (for example `_{rank:03d}_of_{num_proc:03d}`) worked on the first run, then raised `ValueError: Unknown format code 'd' for object of type 'str'` on every rerun that loaded all shards from th... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8968 | json:[] | value:8968 | value:Fix map with num_proc failing on a cache hit when suffix_template has a custom rank format | value:6258644043 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8968/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8968", "html_url": "https://github.com/huggingface/datasets/pull/8968", "diff_url": "https://github.com/huggingface/datasets/pull/8968.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8968.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8968/events | value:2026-11-07T11:44:12Z | value:https://api.github.com/repos/huggingface/datasets/issues/8968/labels{/name} | json:[] | value:NONE | value:2026-11-07T11:44:12Z | json:{"login": "Shizoqua", "id": 136805224, "node_id": "U_kgDOCCd7aA", "avatar_url": "https://avatars.githubusercontent.com/u/136805224?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Shizoqua", "html_url": "https://github.com/Shizoqua", "followers_url": "https://api.github.com/users/Shizoqua/followers", ... | value:PR_kwDODunzps8AAAABNgU1jw | true | |||||||||||
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`Dataset.map` with `num_proc` and a custom `suffix_template` works the first time, but every rerun that loads all shards from the cache raises `ValueError: Unknown format code 'd' for object of type 'str'`. Only the default `{rank:05d}` works. `Dataset.filter` has the same `suffix_template` ... | value:https://api.github.com/repos/huggingface/datasets/issues/8967 | json:[] | value:8967 | value:map(num_proc=...) crashes on a cache hit when suffix_template uses a rank format other than {rank:05d} | value:6258629802 | json:[] | json:{"blocked_by": 0, "total_blocked_by": 0, "blocking": 0, "total_blocking": 0} | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8967/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | value:https://api.github.com/repos/huggingface/datasets/issues/8967/events | value:2026-11-07T11:42:34Z | value:https://api.github.com/repos/huggingface/datasets/issues/8967/labels{/name} | json:[{"login": "Shizoqua", "id": 136805224, "node_id": "U_kgDOCCd7aA", "avatar_url": "https://avatars.githubusercontent.com/u/136805224?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Shizoqua", "html_url": "https://github.com/Shizoqua", "followers_url": "https://api.github.com/users/Shizoqua/followers",... | value:NONE | value:2026-11-07T11:42:56Z | json:{"login": "Shizoqua", "id": 136805224, "node_id": "U_kgDOCCd7aA", "avatar_url": "https://avatars.githubusercontent.com/u/136805224?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Shizoqua", "html_url": "https://github.com/Shizoqua", "followers_url": "https://api.github.com/users/Shizoqua/followers", ... | value:I_kwDODunzps8AAAABdQscqg | true | ||||||||||
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Fixes #8965
`Dataset.batch(by_column=...)` and `IterableDataset.batch(by_column=...)` treated a null key as equal to its neighbours, so different groups were merged into one batch. Keys `[1, None, 2]` gave a single batch. A key column with only nulls raised `ArrowNotImplementedError`. Now a null is i... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8966 | json:[] | value:8966 | value:Fix batch(by_column=) merging groups that are separated by null values | value:6252884195 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8966/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8966", "html_url": "https://github.com/huggingface/datasets/pull/8966", "diff_url": "https://github.com/huggingface/datasets/pull/8966.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8966.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8966/events | value:2026-11-07T00:02:33Z | value:https://api.github.com/repos/huggingface/datasets/issues/8966/labels{/name} | json:[] | value:NONE | value:2026-11-07T00:02:33Z | json:{"login": "Shizoqua", "id": 136805224, "node_id": "U_kgDOCCd7aA", "avatar_url": "https://avatars.githubusercontent.com/u/136805224?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Shizoqua", "html_url": "https://github.com/Shizoqua", "followers_url": "https://api.github.com/users/Shizoqua/followers", ... | value:PR_kwDODunzps8AAAABNbzIaw | true | |||||||||||
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`Dataset.batch(by_column=...)` and `IterableDataset.batch(by_column=...)` treat a null key as equal to its neighbours, so rows from different groups end up in the same batch. A key column that contains only nulls raises instead.
### Steps to reproduce the bug
```python
from datasets import... | value:https://api.github.com/repos/huggingface/datasets/issues/8965 | json:[] | value:8965 | value:batch(by_column=...) merges different groups when the key column contains nulls | value:6252844094 | json:[] | json:{"blocked_by": 0, "total_blocked_by": 0, "blocking": 0, "total_blocking": 0} | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8965/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | value:https://api.github.com/repos/huggingface/datasets/issues/8965/events | value:2026-11-06T23:58:39Z | value:https://api.github.com/repos/huggingface/datasets/issues/8965/labels{/name} | json:[{"login": "Shizoqua", "id": 136805224, "node_id": "U_kgDOCCd7aA", "avatar_url": "https://avatars.githubusercontent.com/u/136805224?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Shizoqua", "html_url": "https://github.com/Shizoqua", "followers_url": "https://api.github.com/users/Shizoqua/followers",... | value:NONE | value:2026-11-07T00:01:20Z | json:{"login": "Shizoqua", "id": 136805224, "node_id": "U_kgDOCCd7aA", "avatar_url": "https://avatars.githubusercontent.com/u/136805224?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Shizoqua", "html_url": "https://github.com/Shizoqua", "followers_url": "https://api.github.com/users/Shizoqua/followers", ... | value:I_kwDODunzps8AAAABdLLUPg | true | ||||||||||
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Fixes #8755 — Audio arrays remain NumPy arrays when using PyTorch formatting.
### Changes made
- Updated the TorchCodec audio decoder to support returning PyTorch tensors.
- Updated `TorchFormatter` to convert Hugging Face audio decoder output to PyTorch-compatible output.
- Preserved existing Nu... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8964 | json:[] | value:8964 | value:Fix audio array tensor conversion with torch formatting | value:6247326162 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8964/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8964", "html_url": "https://github.com/huggingface/datasets/pull/8964", "diff_url": "https://github.com/huggingface/datasets/pull/8964.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8964.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8964/events | value:2026-11-06T17:18:36Z | value:https://api.github.com/repos/huggingface/datasets/issues/8964/labels{/name} | json:[] | value:NONE | value:2026-11-07T17:23:29Z | json:{"login": "josephabishak88", "id": 249288588, "node_id": "U_kgDODtvXjA", "avatar_url": "https://avatars.githubusercontent.com/u/249288588?v=4", "gravatar_id": "", "url": "https://api.github.com/users/josephabishak88", "html_url": "https://github.com/josephabishak88", "followers_url": "https://api.github.com/users/... | value:PR_kwDODunzps8AAAABNXSGnw | true | |||||||||||
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### `http(s)://` data files fail on a clean install
fsspec's `HTTPFileSystem` needs `aiohttp`, but `aiohttp` is only in th... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8963 | json:[] | value:8963 | value:Fix Spark working_dir, tenbin infinite loop, HF auth host check, missing aiohttp and Harbor errors | value:6223147260 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8963/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8963", "html_url": "https://github.com/huggingface/datasets/pull/8963", "diff_url": "https://github.com/huggingface/datasets/pull/8963.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8963.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8963/events | value:2026-11-05T12:26:07Z | value:https://api.github.com/repos/huggingface/datasets/issues/8963/labels{/name} | json:[] | value:NONE | value:2026-11-05T12:26:07Z | json:{"login": "Marouane-elfadli", "id": 228027721, "node_id": "U_kgDODZdtSQ", "avatar_url": "https://avatars.githubusercontent.com/u/228027721?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Marouane-elfadli", "html_url": "https://github.com/Marouane-elfadli", "followers_url": "https://api.github.com/use... | value:PR_kwDODunzps8AAAABND8Yng | true | |||||||||||
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### Summary
- Prioritize 3D dataset detection when a repository contains mesh files alongside image textures.
- Prevent image textures from causing a 3D dataset to be incorrectly detected as an `imagefolder`.
- Preserve the existing format-selection behavior for other formats.
### Tests
- `python -... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8962 | json:[] | value:8962 | value:Fix : 3D format detection when texture files outnumber models | value:6218188671 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8962/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8962", "html_url": "https://github.com/huggingface/datasets/pull/8962", "diff_url": "https://github.com/huggingface/datasets/pull/8962.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8962.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8962/events | value:2026-11-05T06:39:31Z | value:https://api.github.com/repos/huggingface/datasets/issues/8962/labels{/name} | json:[] | value:NONE | value:2026-11-05T06:39:31Z | json:{"login": "bhumika-231206", "id": 351443745, "node_id": "U_kgDOFPKbIQ", "avatar_url": "https://avatars.githubusercontent.com/u/351443745?v=4", "gravatar_id": "", "url": "https://api.github.com/users/bhumika-231206", "html_url": "https://github.com/bhumika-231206", "followers_url": "https://api.github.com/users/bhu... | value:PR_kwDODunzps8AAAABM_8D8g | true | |||||||||||
value:https://api.github.com/repos/huggingface/datasets/issues/8961/timeline | value:3 | value:https://api.github.com/repos/huggingface/datasets | value:open | value:https://github.com/huggingface/datasets/pull/8961 | value:https://api.github.com/repos/huggingface/datasets/issues/8961/comments | value:`Dataset.add_item` infers an Arrow table before applying the existing dataset features. Appending a Python integer above `2**63 - 1` therefore raises `OverflowError` even when its column is declared as `Value("uint64")`.
Retry the overflowing column with its existing scalar uint64 type. Other columns retain thei... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8961 | json:[] | value:8961 | value:Fix appending declared uint64 values beyond int64 range | value:6212024072 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8961/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8961", "html_url": "https://github.com/huggingface/datasets/pull/8961", "diff_url": "https://github.com/huggingface/datasets/pull/8961.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8961.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8961/events | value:2026-11-04T21:48:27Z | value:https://api.github.com/repos/huggingface/datasets/issues/8961/labels{/name} | json:[] | value:NONE | value:2026-11-06T10:00:51Z | json:{"login": "GoldArowana", "id": 27399349, "node_id": "MDQ6VXNlcjI3Mzk5MzQ5", "avatar_url": "https://avatars.githubusercontent.com/u/27399349?v=4", "gravatar_id": "", "url": "https://api.github.com/users/GoldArowana", "html_url": "https://github.com/GoldArowana", "followers_url": "https://api.github.com/users/GoldAr... | value:PR_kwDODunzps8AAAABM7A3nA | true | |||||||||||
value:2026-11-04T16:20:33Z | value:https://api.github.com/repos/huggingface/datasets/issues/8960/timeline | value:1 | value:https://api.github.com/repos/huggingface/datasets | 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:closed | value:https://github.com/huggingface/datasets/pull/8960 | value:https://api.github.com/repos/huggingface/datasets/issues/8960/comments | value:It was using the default of `batch_size` which is `None`, which means full downloads
By default it now uses max batch size (1000) | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8960 | json:[] | value:8960 | value:Fix batch(by_column=) default accumulation causing full downloads | value:6206755398 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8960/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8960", "html_url": "https://github.com/huggingface/datasets/pull/8960", "diff_url": "https://github.com/huggingface/datasets/pull/8960.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8960.patch", "merged_at": "2026-11-04T16:20:33Z"} | value:https://api.github.com/repos/huggingface/datasets/issues/8960/events | value:2026-11-04T16:20:14Z | value:https://api.github.com/repos/huggingface/datasets/issues/8960/labels{/name} | json:[] | value:MEMBER | value:2026-11-04T16:28:11Z | 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:PR_kwDODunzps8AAAABM2vxEg | true | |||||||||
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Read timestamp columns as objects and let the existing Arrow schema conversion parse them. This preserves the declared timestamp type, na... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8959 | json:[] | value:8959 | value:Fix CSV loading with explicit timestamp features | value:6206566552 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8959/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8959", "html_url": "https://github.com/huggingface/datasets/pull/8959", "diff_url": "https://github.com/huggingface/datasets/pull/8959.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8959.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8959/events | value:2026-11-04T16:08:14Z | value:https://api.github.com/repos/huggingface/datasets/issues/8959/labels{/name} | json:[] | value:NONE | value:2026-11-05T14:32:20Z | json:{"login": "feiiiiii5", "id": 204683769, "node_id": "U_kgDODDM5-Q", "avatar_url": "https://avatars.githubusercontent.com/u/204683769?v=4", "gravatar_id": "", "url": "https://api.github.com/users/feiiiiii5", "html_url": "https://github.com/feiiiiii5", "followers_url": "https://api.github.com/users/feiiiiii5/follower... | value:PR_kwDODunzps8AAAABM2mErg | true | |||||||||||
value:2026-11-04T17:56:43Z | value:https://api.github.com/repos/huggingface/datasets/issues/8958/timeline | value:1 | value:https://api.github.com/repos/huggingface/datasets | 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:closed | value:https://github.com/huggingface/datasets/pull/8958 | value:https://api.github.com/repos/huggingface/datasets/issues/8958/comments | value:`Mesh` (and the `meshfolder` builder behind it) only accepts `.glb`, `.ply` and `.stl`, although `trimesh` — which does the decoding — also reads glTF. So a folder of `.gltf` models produces no `Mesh` column at all, and `Mesh().decode_example({"path": "model.gltf", ...})` raises.
Measured on `main` (62e0b421), b... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8958 | json:[] | value:8958 | value:fix(mesh): accept .gltf in the Mesh feature and the meshfolder builder | value:6204466923 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8958/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8958", "html_url": "https://github.com/huggingface/datasets/pull/8958", "diff_url": "https://github.com/huggingface/datasets/pull/8958.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8958.patch", "merged_at": "2026-11-04T17:56:43Z"} | value:https://api.github.com/repos/huggingface/datasets/issues/8958/events | value:2026-11-04T14:13:03Z | value:https://api.github.com/repos/huggingface/datasets/issues/8958/labels{/name} | json:[] | value:CONTRIBUTOR | value:2026-11-04T17:56:43Z | json:{"login": "li-lizhe", "id": 82501526, "node_id": "MDQ6VXNlcjgyNTAxNTI2", "avatar_url": "https://avatars.githubusercontent.com/u/82501526?v=4", "gravatar_id": "", "url": "https://api.github.com/users/li-lizhe", "html_url": "https://github.com/li-lizhe", "followers_url": "https://api.github.com/users/li-lizhe/follow... | value:PR_kwDODunzps8AAAABM040tw | true | |||||||||
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if `split_dataset_by_node` sounds confusing in this setting we can also imagine a different function dedicated to meshes | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8957 | json:[] | value:8957 | value:more distributed docs (hsdp) | value:6204284026 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8957/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8957", "html_url": "https://github.com/huggingface/datasets/pull/8957", "diff_url": "https://github.com/huggingface/datasets/pull/8957.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8957.patch", "merged_at": "2026-11-05T11:28:05Z"} | value:https://api.github.com/repos/huggingface/datasets/issues/8957/events | value:2026-11-04T14:02:38Z | value:https://api.github.com/repos/huggingface/datasets/issues/8957/labels{/name} | json:[] | value:MEMBER | value:2026-11-05T11:28:08Z | 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:PR_kwDODunzps8AAAABM0vWwQ | true | |||||||||
value:https://api.github.com/repos/huggingface/datasets/issues/8956/timeline | json:{"total": 0, "completed": 0, "percent_completed": 0} | value:3 | value:https://api.github.com/repos/huggingface/datasets | value:open | value:https://github.com/huggingface/datasets/issues/8956 | value:https://api.github.com/repos/huggingface/datasets/issues/8956/comments | value:[cfahlgren1/3d-model-samples](https://huggingface.co/datasets/cfahlgren1/3d-model-samples/tree/main) has 6 `.glb` files and one `.gltf` model, but the viewer shows it as an `Image` dataset with 15 rows of FlightHelmet textures and no 3D models.
The format comes from the most common file extension, and a `.gltf` ... | value:https://api.github.com/repos/huggingface/datasets/issues/8956 | json:[] | value:8956 | value:[3d datasets]: repos with gltf textures get detected as images | value:6203429316 | json:[] | json:{"blocked_by": 0, "total_blocked_by": 0, "blocking": 0, "total_blocking": 0} | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8956/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | value:https://api.github.com/repos/huggingface/datasets/issues/8956/events | value:2026-11-04T13:12:16Z | value:https://api.github.com/repos/huggingface/datasets/issues/8956/labels{/name} | json:[] | value:CONTRIBUTOR | value:2026-11-05T04:42:54Z | json:{"login": "cfahlgren1", "id": 13546028, "node_id": "MDQ6VXNlcjEzNTQ2MDI4", "avatar_url": "https://avatars.githubusercontent.com/u/13546028?v=4", "gravatar_id": "", "url": "https://api.github.com/users/cfahlgren1", "html_url": "https://github.com/cfahlgren1", "followers_url": "https://api.github.com/users/cfahlgren... | value:I_kwDODunzps8AAAABccDRxA | true | |||||||||||
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Empty slices retain no row blocks. Rebuild those results directly from the saved schema, preserving column types, nullability and metadata. Nonempty block reconstruction... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8954 | json:[] | value:8954 | value:Fix pickling round-trips for empty ConcatenationTable slices | value:6194424635 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8954/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8954", "html_url": "https://github.com/huggingface/datasets/pull/8954", "diff_url": "https://github.com/huggingface/datasets/pull/8954.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8954.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8954/events | value:2026-11-04T01:29:41Z | value:https://api.github.com/repos/huggingface/datasets/issues/8954/labels{/name} | json:[] | value:NONE | value:2026-11-05T13:39:08Z | json:{"login": "ElMagAmine", "id": 36851541, "node_id": "MDQ6VXNlcjM2ODUxNTQx", "avatar_url": "https://avatars.githubusercontent.com/u/36851541?v=4", "gravatar_id": "", "url": "https://api.github.com/users/ElMagAmine", "html_url": "https://github.com/ElMagAmine", "followers_url": "https://api.github.com/users/ElMagAmin... | value:PR_kwDODunzps8AAAABMs0sZQ | true | |||||||||||
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With `num_proc > 1`, `Dataset.map` splits the dataset into equal contiguous shards with `shard(contiguous=True)`, ignoring `batch_size`. Every shard then ends with its own incomplete batch:
- a batched function receives short batches in the middle of the dataset, not only at the end;
- `Dataset.bat... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8952 | json:[] | value:8952 | value:Shard batched map on batch boundaries with num_proc | value:6191600799 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8952/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8952", "html_url": "https://github.com/huggingface/datasets/pull/8952", "diff_url": "https://github.com/huggingface/datasets/pull/8952.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8952.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8952/events | value:2026-11-03T21:38:17Z | value:https://api.github.com/repos/huggingface/datasets/issues/8952/labels{/name} | json:[] | value:NONE | value:2026-11-05T17:01:32Z | json:{"login": "udsy19", "id": 71968569, "node_id": "MDQ6VXNlcjcxOTY4NTY5", "avatar_url": "https://avatars.githubusercontent.com/u/71968569?v=4", "gravatar_id": "", "url": "https://api.github.com/users/udsy19", "html_url": "https://github.com/udsy19", "followers_url": "https://api.github.com/users/udsy19/followers", "f... | value:PR_kwDODunzps8AAAABMqjtEQ | true | |||||||||||
value:https://api.github.com/repos/huggingface/datasets/issues/8951/timeline | value:1 | value:https://api.github.com/repos/huggingface/datasets | value:open | value:https://github.com/huggingface/datasets/pull/8951 | value:https://api.github.com/repos/huggingface/datasets/issues/8951/comments | value:After `set_format(type=..., columns=[...])` or `with_transform(..., columns=[...])`, reading a column that is not in the format columns raises `KeyError`:
```python
from datasets import Dataset
ds = Dataset.from_dict({"input_ids": [[1, 2], [3, 4]], "label": [0, 1], "text": ["a b", "c d"]})
ds.set_format(type="n... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8951 | json:[] | value:8951 | value:Fix reading a column that is not in the format columns | value:6191078323 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8951/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8951", "html_url": "https://github.com/huggingface/datasets/pull/8951", "diff_url": "https://github.com/huggingface/datasets/pull/8951.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8951.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8951/events | value:2026-11-03T21:01:50Z | value:https://api.github.com/repos/huggingface/datasets/issues/8951/labels{/name} | json:[] | value:NONE | value:2026-11-05T18:32:55Z | json:{"login": "akanyaani", "id": 11317416, "node_id": "MDQ6VXNlcjExMzE3NDE2", "avatar_url": "https://avatars.githubusercontent.com/u/11317416?v=4", "gravatar_id": "", "url": "https://api.github.com/users/akanyaani", "html_url": "https://github.com/akanyaani", "followers_url": "https://api.github.com/users/akanyaani/fo... | value:PR_kwDODunzps8AAAABMqIx-w | true | |||||||||||
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pyarrow's JSON reader can return a table with invalid list offsets when a list starts with `null`. The `.jsonl` branch of `_read_metadata` in folder-based builders (`imagefolder` and the others) used that table without checking it, so values were silently wrong: `[null, 1]` and `[2]` loaded... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8950 | json:[] | value:8950 | value:Validate metadata.jsonl tables in folder-based builders | value:6190774085 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8950/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8950", "html_url": "https://github.com/huggingface/datasets/pull/8950", "diff_url": "https://github.com/huggingface/datasets/pull/8950.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8950.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8950/events | value:2026-11-03T20:41:12Z | value:https://api.github.com/repos/huggingface/datasets/issues/8950/labels{/name} | json:[] | value:NONE | value:2026-11-03T20:41:12Z | json:{"login": "shashank11yadav", "id": 65058495, "node_id": "MDQ6VXNlcjY1MDU4NDk1", "avatar_url": "https://avatars.githubusercontent.com/u/65058495?v=4", "gravatar_id": "", "url": "https://api.github.com/users/shashank11yadav", "html_url": "https://github.com/shashank11yadav", "followers_url": "https://api.github.com/... | value:PR_kwDODunzps8AAAABMp5CLw | true | |||||||||||
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When the `metadata.jsonl` of an `imagefolder` has a list column whose first element is `null`, `load_dataset` returns wrong values with no error. In the example below, `[null, 1]` and `[2]` come back as `[1, 2]` and `[0]`.
The same rows loaded with the `json` builder come back correctly on ... | value:https://api.github.com/repos/huggingface/datasets/issues/8949 | json:[] | value:8949 | value:imagefolder metadata.jsonl: a list starting with null loads as wrong values | value:6189886287 | json:[] | json:{"blocked_by": 0, "total_blocked_by": 0, "blocking": 0, "total_blocking": 0} | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8949/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | value:https://api.github.com/repos/huggingface/datasets/issues/8949/events | value:2026-11-03T19:42:12Z | value:https://api.github.com/repos/huggingface/datasets/issues/8949/labels{/name} | json:[] | value:NONE | value:2026-11-03T19:56:57Z | json:{"login": "shashank11yadav", "id": 65058495, "node_id": "MDQ6VXNlcjY1MDU4NDk1", "avatar_url": "https://avatars.githubusercontent.com/u/65058495?v=4", "gravatar_id": "", "url": "https://api.github.com/users/shashank11yadav", "html_url": "https://github.com/shashank11yadav", "followers_url": "https://api.github.com/... | value:I_kwDODunzps8AAAABcPIrTw | true | |||||||||||
value:https://api.github.com/repos/huggingface/datasets/issues/8948/timeline | value:1 | value:https://api.github.com/repos/huggingface/datasets | value:open | value:https://github.com/huggingface/datasets/pull/8948 | value:https://api.github.com/repos/huggingface/datasets/issues/8948/comments | value:`Image().encode_example` fails on single-channel arrays shaped `(H, W, 1)`, which is how many image pipelines (OpenCV, torchvision, `np.expand_dims`) hand over grayscale images:
```python
import numpy as np
from datasets import Dataset, Features, Image
array = np.zeros((4, 4, 1), dtype=np.uint8)
Dataset.from_di... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8948 | json:[] | value:8948 | value:Encode single channel (H, W, 1) arrays with the Image feature | value:6188863008 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8948/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8948", "html_url": "https://github.com/huggingface/datasets/pull/8948", "diff_url": "https://github.com/huggingface/datasets/pull/8948.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8948.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8948/events | value:2026-11-03T18:35:57Z | value:https://api.github.com/repos/huggingface/datasets/issues/8948/labels{/name} | json:[] | value:NONE | value:2026-11-05T16:55:39Z | json:{"login": "Fahmid-Arman", "id": 184666560, "node_id": "U_kgDOCwHJwA", "avatar_url": "https://avatars.githubusercontent.com/u/184666560?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Fahmid-Arman", "html_url": "https://github.com/Fahmid-Arman", "followers_url": "https://api.github.com/users/Fahmid-Ar... | value:PR_kwDODunzps8AAAABMoWKjQ | true | |||||||||||
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Map declared ... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8947 | json:[] | value:8947 | value:Preserve declared scalar types when reading CSV features | value:6186607240 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8947/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8947", "html_url": "https://github.com/huggingface/datasets/pull/8947", "diff_url": "https://github.com/huggingface/datasets/pull/8947.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8947.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8947/events | value:2026-11-03T16:17:41Z | value:https://api.github.com/repos/huggingface/datasets/issues/8947/labels{/name} | json:[] | value:NONE | value:2026-11-04T06:38:14Z | json:{"login": "Wisnflo", "id": 189682482, "node_id": "U_kgDOC05TMg", "avatar_url": "https://avatars.githubusercontent.com/u/189682482?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Wisnflo", "html_url": "https://github.com/Wisnflo", "followers_url": "https://api.github.com/users/Wisnflo/followers", "fol... | value:PR_kwDODunzps8AAAABMmhLug | true | |||||||||||
value:https://api.github.com/repos/huggingface/datasets/issues/8933/timeline | value:0 | value:https://api.github.com/repos/huggingface/datasets | value:open | value:https://github.com/huggingface/datasets/pull/8933 | value:https://api.github.com/repos/huggingface/datasets/issues/8933/comments | value:`map()` and `filter()` recognize async functions but classify objects with an async `__call__` as synchronous callbacks. A callable mapper then receives a coroutine instead of a mapping; a callable predicate can silently keep every row without being awaited.
Use a shared callback classifier for `Dataset` and `It... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8933 | json:[] | value:8933 | value:Fix async callable callbacks in map and filter | value:6171645382 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8933/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8933", "html_url": "https://github.com/huggingface/datasets/pull/8933", "diff_url": "https://github.com/huggingface/datasets/pull/8933.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8933.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8933/events | value:2026-11-02T21:50:26Z | value:https://api.github.com/repos/huggingface/datasets/issues/8933/labels{/name} | json:[] | value:NONE | value:2026-11-02T21:50:26Z | json:{"login": "GoldArowana", "id": 27399349, "node_id": "MDQ6VXNlcjI3Mzk5MzQ5", "avatar_url": "https://avatars.githubusercontent.com/u/27399349?v=4", "gravatar_id": "", "url": "https://api.github.com/users/GoldArowana", "html_url": "https://github.com/GoldArowana", "followers_url": "https://api.github.com/users/GoldAr... | value:PR_kwDODunzps8AAAABMabj8w | true | |||||||||||
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`dill` versions before 0.3.6 can't handle code objects on Python 3.11+, so `Dataset.map(num_proc=...)` crashes. `setup.py` still allows `dill>=0.3.0` on every Python version, so an environment that keeps an older `dill` installs `datasets` without complaint and fails at runtime. #7537 shows the... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8932 | json:[] | value:8932 | value:Require dill>=0.3.6 on Python 3.11+ | value:6169556813 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8932/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8932", "html_url": "https://github.com/huggingface/datasets/pull/8932", "diff_url": "https://github.com/huggingface/datasets/pull/8932.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8932.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8932/events | value:2026-11-02T19:33:47Z | value:https://api.github.com/repos/huggingface/datasets/issues/8932/labels{/name} | json:[] | value:CONTRIBUTOR | value:2026-11-02T19:33:47Z | 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:PR_kwDODunzps8AAAABMYwSjA | true | |||||||||||
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Use the current directory when the filename has no pa... | value:False | value:https://api.github.com/repos/huggingface/datasets/issues/8931 | json:[] | value:8931 | value:Fix bare filenames for indices caches | value:6163474405 | json:[] | value:False | json:{"url": "https://api.github.com/repos/huggingface/datasets/issues/8931/reactions", "total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | json:{"url": "https://api.github.com/repos/huggingface/datasets/pulls/8931", "html_url": "https://github.com/huggingface/datasets/pull/8931", "diff_url": "https://github.com/huggingface/datasets/pull/8931.diff", "patch_url": "https://github.com/huggingface/datasets/pull/8931.patch", "merged_at": null} | value:https://api.github.com/repos/huggingface/datasets/issues/8931/events | value:2026-11-02T13:26:22Z | value:https://api.github.com/repos/huggingface/datasets/issues/8931/labels{/name} | json:[] | value:CONTRIBUTOR | value:2026-11-02T13:26:22Z | json:{"login": "Linxiushen", "id": 142557582, "node_id": "U_kgDOCH9Bjg", "avatar_url": "https://avatars.githubusercontent.com/u/142557582?v=4", "gravatar_id": "", "url": "https://api.github.com/users/Linxiushen", "html_url": "https://github.com/Linxiushen", "followers_url": "https://api.github.com/users/Linxiushen/foll... | value:PR_kwDODunzps8AAAABMT1xKQ | true |
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