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https://api.github.com/repos/huggingface/datasets/issues/7571
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3,074,116,942
PR_kwDODunzps6WvRqi
7,571
fix string_to_dict test
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7,570
Dataset lib seems to broke after fssec lib update
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### Describe the bug I am facing an issue since today where HF's dataset is acting weird and in some instances failure to recognise a valid dataset entirely, I think it is happening due to recent change in `fsspec` lib as using this command fixed it for me in one-time: `!pip install -U datasets huggingface_hub fsspec`...
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7,569
Dataset creation is broken if nesting a dict inside a dict inside a list
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### Describe the bug Hey, I noticed that the creation of datasets with `Dataset.from_generator` is broken if dicts and lists are nested in a certain way and a schema is being passed. See below for details. Best, Tim ### Steps to reproduce the bug Runing this code: ```python from datasets import Dataset, Features,...
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`IterableDatasetDict.map()` call removes `column_names` (in fact info.features)
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When calling `IterableDatasetDict.map()`, each split’s `IterableDataset.map()` is invoked without a `features` argument. While omitting the argument isn’t itself incorrect, the implementation then sets `info.features = features`, which destroys the original `features` content. Since `IterableDataset.column_names` relie...
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7,567
interleave_datasets seed with multiple workers
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2025-05-12T22:38:27
2025-10-24T14:04:37
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### Describe the bug Using interleave_datasets with multiple dataloader workers and a seed set causes the same dataset sampling order across all workers. Should the seed be modulated with the worker id? ### Steps to reproduce the bug See above ### Expected behavior See above ### Environment info - `datasets` ve...
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7,566
terminate called without an active exception; Aborted (core dumped)
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### Describe the bug I use it as in the tutorial here: https://huggingface.co/docs/datasets/stream, and it ends up with abort. ### Steps to reproduce the bug 1. `pip install datasets` 2. ``` $ cat main.py #!/usr/bin/env python3 from datasets import load_dataset dataset = load_dataset('HuggingFaceFW/fineweb', spl...
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add check if repo exists for dataset uploading
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2025-09-11T05:00:10
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Currently, I'm reuploading datasets for [`MTEB`](https://github.com/embeddings-benchmark/mteb/). Some of them have many splits (more than 20), and I'm encountering the error: `Too many requests for https://huggingface.co/datasets/repo/create`. It seems that this issue occurs because the dataset tries to recreate it...
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Implementation of iteration over values of a column in an IterableDataset object
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Refers to [this issue](https://github.com/huggingface/datasets/issues/7381).
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set dev version
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NotImplementedError: <class 'datasets.iterable_dataset.RepeatExamplesIterable'> doesn't implement num_shards yet
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### Describe the bug When using `.repeat()` on an `IterableDataset`, this error gets thrown. There is [this thread](https://discuss.huggingface.co/t/making-an-infinite-iterabledataset/146192/5) that seems to imply the fix is trivial, but I don't know anything about this codebase, so I'm opening this issue rather than ...
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fix decoding tests
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reported in https://github.com/huggingface/datasets/pull/7557 (I just reorganized the condition) wanted to apply this change to the original PR but github didn't let me apply it directly - merging this one instead
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check for empty _formatting
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Fixes a regression from #7553 breaking shuffling of iterable datasets <img width="884" alt="Screenshot 2025-05-07 at 9 16 52 AM" src="https://github.com/user-attachments/assets/d2f43c5f-4092-4efe-ac31-a32cbd025fe3" />
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Add `--merge-pull-request` option for `convert_to_parquet`
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Closes #7527 Note that this implementation **will only merge the last PR in the case that they get split up by `push_to_hub`**. See https://github.com/huggingface/datasets/discussions/7555 for more details.
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datasets downloads and generates all splits, even though a single split is requested (for dataset with loading script)
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### Describe the bug `datasets` downloads and generates all splits, even though a single split is requested. [This](https://huggingface.co/datasets/jordiae/exebench) is the dataset in question. It uses a loading script. I am not 100% sure that this is a bug, because maybe with loading scripts `datasets` must actual...
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Rebatch arrow iterables before formatted iterable
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close https://github.com/huggingface/datasets/issues/7538 and https://github.com/huggingface/datasets/issues/7475
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Enable xet in push to hub
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follows https://github.com/huggingface/huggingface_hub/pull/3035 related to https://github.com/huggingface/datasets/issues/7526
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Issue with offline mode and partial dataset cached
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### Describe the bug Hi, a issue related to #4760 here when loading a single file from a dataset, unable to access it in offline mode afterwards ### Steps to reproduce the bug ```python import os # os.environ["HF_HUB_OFFLINE"] = "1" os.environ["HF_TOKEN"] = "xxxxxxxxxxxxxx" import datasets dataset_name = "uonlp/...
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disable aiohttp depend for python 3.13t free-threading compat
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TypeError: Couldn't cast array of type string to null on webdataset format dataset
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### Describe the bug ```python from datasets import load_dataset dataset = load_dataset("animetimm/danbooru-wdtagger-v4-w640-ws-30k") ``` got ``` File "/home/ubuntu/miniconda3/lib/python3.10/site-packages/datasets/arrow_writer.py", line 626, in write_batch arrays.append(pa.array(typed_sequence)) File "pyarro...
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Python 3.13t (free threads) Compat
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2025-05-02T09:20:09
2025-05-12T15:11:32
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### Describe the bug Cannot install `datasets` under `python 3.13t` due to dependency on `aiohttp` and aiohttp cannot be built for free-threading python. The `free threading` support issue in `aiothttp` is active since August 2024! Ouch. https://github.com/aio-libs/aiohttp/issues/8796#issue-2475941784 `pip install...
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Avoid global umask for setting file mode.
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This PR updates the method for setting the permissions on `cache_path` after calling `shutil.move`. The call to `shutil.move` may not preserve permissions if the source and destination are on different filesystems. Reading and resetting umask can cause race conditions, so directly read what permissions were set for the...
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Large memory use when loading large datasets to a ZFS pool
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### Describe the bug When I load large parquet based datasets from the hub like `MLCommons/peoples_speech` using `load_dataset`, all my memory (500GB) is used and isn't released after loading, meaning that the process is terminated by the kernel if I try to load an additional dataset. This makes it impossible to train...
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Networked Pull Through Cache
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### Feature request Introduce a HF_DATASET_CACHE_NETWORK_LOCATION configuration (e.g. an environment variable) together with a companion network cache service. Enable a three-tier cache lookup for datasets: 1. Local on-disk cache 2. Configurable network cache proxy 3. Official Hugging Face Hub ### Motivation - Dis...
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Add try_original_type to DatasetDict.map
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This PR resolves #7472 for DatasetDict The previously merged PR #7483 added `try_original_type` to ArrowDataset, but DatasetDict misses `try_original_type` Cc: @lhoestq
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The memory-disk mapping failure issue of the map function(resolved, but there are some suggestions.)
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### Describe the bug ## bug When the map function processes a large dataset, it temporarily stores the data in a cache file on the disk. After the data is stored, the memory occupied by it is released. Therefore, when using the map function to process a large-scale dataset, only a dataset space of the size of `writer_...
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set dev version
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fix ``` TypeError: ArrayExtensionArray.to_pylist() got an unexpected keyword argument 'maps_as_pydicts' ```
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Fix IterableDataset state_dict shard_example_idx counting
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# Fix IterableDataset's state_dict shard_example_idx reporting ## Description This PR fixes issue #7475 where the `shard_example_idx` value in `IterableDataset`'s `state_dict()` always equals the number of samples in a shard, even if only a few examples have been consumed. The issue is in the `_iter_arrow` met...
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`IterableDataset` drops samples when resuming from a checkpoint
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When resuming from a checkpoint, `IterableDataset` will drop samples if `num_shards % world_size == 0` and the underlying example supports `iter_arrow` and needs to be formatted. In that case, the `FormattedExamplesIterable` fetches a batch of samples from the child iterable's `iter_arrow` and yields them one by one ...
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`datasets.map(..., num_proc=4)` multi-processing fails
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The following code fails in python 3.11+ ```python tokenized_datasets = datasets.map(tokenize_function, batched=True, num_proc=4, remove_columns=["text"]) ``` Error log: ```bash Traceback (most recent call last): File "/usr/local/lib/python3.12/dist-packages/multiprocess/process.py", line 315, in _bootstrap self.ru...
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[Errno 13] Permission denied: on `.incomplete` file
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### Describe the bug When downloading a dataset, we frequently hit the below Permission Denied error. This looks to happen (at least) across datasets in HF, S3, and GCS. It looks like the `temp_file` being passed [here](https://github.com/huggingface/datasets/blob/main/src/datasets/utils/file_utils.py#L412) can somet...
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Change dill version in requirements
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Change dill version to >=0.3.9,<0.4.5 and check for errors
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TensorFlow RaggedTensor Support (batch-level)
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### Feature request Hi, Currently datasets does not support RaggedTensor output on batch-level. When building a Object Detection Dataset (with TensorFlow) I need to enable RaggedTensors as that's how BBoxes & classes are expected from the Keras Model POV. Currently there's a error thrown saying that "Nested Data is ...
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Add custom fingerprint support to `from_generator`
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This PR adds `dataset_id_suffix` parameter to 'Dataset.from_generator' function. `Dataset.from_generator` function passes all of its arguments to `BuilderConfig.create_config_id`, including generator function itself. `BuilderConfig.create_config_id` function tries to hash all the args, which can take a large amount ...
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Document the HF_DATASETS_CACHE environment variable in the datasets cache documentation
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This pull request updates the Datasets documentation to include the `HF_DATASETS_CACHE` environment variable. While the current documentation only mentions `HF_HOME` for overriding the default cache directory, `HF_DATASETS_CACHE` is also a supported and useful option for specifying a custom cache location for dataset...
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Deepspeed reward training hangs at end of training with Dataset.from_list
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There seems to be a weird interaction between Deepspeed, the Dataset.from_list method and trl's RewardTrainer. On a multi-GPU setup (10 A100s), training always hangs at the very end of training until it times out. The training itself works fine until the end of training and running the same script with Deepspeed on a s...
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How to solve "Spaces stuck in Building" problems
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### Describe the bug Public spaces may stuck in Building after restarting, error log as follows: build error Unexpected job error ERROR: failed to push spaces-registry.huggingface.tech/spaces/*:cpu-*-*: unexpected status from HEAD request to https://spaces-registry.huggingface.tech/v2/spaces/*/manifests/cpu-*-*: 401...
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audio folder builder cannot detect custom split name
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### Describe the bug when using audio folder builder (`load_dataset("audiofolder", data_dir="/path/to/folder")`), it cannot detect custom split name other than train/validation/test ### Steps to reproduce the bug i have the following folder structure ``` my_dataset/ ├── train/ │ ├── lorem.wav │ ├── … │ └── met...
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Data Studio Error: Convert JSONL incorrectly
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### Describe the bug Hi there, I uploaded a dataset here https://huggingface.co/datasets/V-STaR-Bench/V-STaR, but I found that Data Studio incorrectly convert the "bboxes" value for the whole dataset. Therefore, anyone who downloaded the dataset via the API would get the wrong "bboxes" value in the data file. Could ...
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Auto-merge option for `convert-to-parquet`
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2025-04-18T16:03:22
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### Feature request Add a command-line option, e.g. `--auto-merge-pull-request` that enables automatic merging of the commits created by the `convert-to-parquet` tool. ### Motivation Large datasets may result in dozens of PRs due to the splitting mechanism. Each of these has to be manually accepted via the website. ...
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Faster downloads/uploads with Xet storage
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![Image](https://github.com/user-attachments/assets/6e247f4a-d436-4428-a682-fe18ebdc73a9) ## Xet is out ! Over the past few weeks, Hugging Face’s [Xet Team](https://huggingface.co/xet-team) took a major step forward by [migrating the first Model and Dataset repositories off LFS and to Xet storage](https://huggingface...
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Fix indexing in split commit messages
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When a large commit is split up, it seems the commit index in the message is zero-based while the total number is one-based. I came across this running `convert-to-parquet` and was wondering why there was no `6-of-6` commit. This PR fixes that by adding one to the commit index, so both are one-based. Current behavio...
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Preserve formatting in concatenated IterableDataset
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Fixes #7515
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fix: Image Feature in Datasets Library Fails to Handle bytearray Objects from Spark DataFrames (#7517)
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## Task Support bytes-like objects (bytes and bytearray) in Features classes ### Description The `Features` classes only accept `bytes` objects for binary data, but not `bytearray`. This leads to errors when using `IterableDataset.from_spark()` with Spark DataFrames as they contain `bytearray` objects, even though...
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Update items in the dataset without `map`
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### Feature request I would like to be able to update items in my dataset without affecting all rows. At least if there was a range option, I would be able to process those items, save the dataset, and then continue. If I am supposed to split the dataset first, that is not clear, since the docs suggest that any of th...
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pdf docs fixes
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close https://github.com/huggingface/datasets/issues/7494
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num_proc parallelization works only for first ~10s.
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### Describe the bug When I try to load an already downloaded dataset with num_proc=64, the speed is very high for the first 10-20 seconds acheiving 30-40K samples / s, and 100% utilization for all cores but it soon drops to <= 1000 with almost 0% utilization for most cores. ### Steps to reproduce the bug ``` // do...
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I_kwDODunzps6ylPNd
7,517
Image Feature in Datasets Library Fails to Handle bytearray Objects from Spark DataFrames
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2025-04-15T11:29:17
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### Describe the bug When using `IterableDataset.from_spark()` with a Spark DataFrame containing image data, the `Image` feature class fails to properly process this data type, causing an `AttributeError: 'bytearray' object has no attribute 'get'` ### Steps to reproduce the bug 1. Create a Spark DataFrame with a col...
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7,516
unsloth/DeepSeek-R1-Distill-Qwen-32B server error
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### Describe the bug hfhubhttperror: 500 server error: internal server error for url: https://huggingface.co/api/models/unsloth/deepseek-r1-distill-qwen-32b-bnb-4bit/commits/main (request id: root=1-67fe23fa-3a2150eb444c2a823c388579;de3aed68-c397-4da5-94d4-6565efd3b919) internal error - we're working hard to fix this ...
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7,515
`concatenate_datasets` does not preserve Pytorch format for IterableDataset
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2025-05-19T15:07:38
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### Describe the bug When concatenating datasets with `concatenate_datasets`, I would expect the resulting combined dataset to be in the same format as the inputs (assuming it's consistent). This is indeed the behavior when combining `Dataset`, but not when combining `IterableDataset`. Specifically, when applying `con...
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Do not hash `generator` in `BuilderConfig.create_config_id`
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`Dataset.from_generator` function passes all of its arguments to `BuilderConfig.create_config_id`, including generator function itself. `BuilderConfig.create_config_id` function tries to hash all the args, and hashing a `generator` can take a large amount of time or even cause MemoryError if the dataset processed in a ...
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MemoryError while creating dataset from generator
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2025-10-23T22:55:10
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CONTRIBUTOR
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### Describe the bug # TL:DR `Dataset.from_generator` function passes all of its arguments to `BuilderConfig.create_config_id`, including `generator` function itself. `BuilderConfig.create_config_id` function tries to hash all the args, which can take a large amount of time or even cause MemoryError if the dataset pr...
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.map() fails if function uses pyvista
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2025-04-14T19:43:02
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### Describe the bug Using PyVista inside a .map() produces a crash with `objc[78796]: +[NSResponder initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to ...
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Incompatibile dill version (0.3.9) in datasets 2.18.0 - 3.5.0
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2025-09-15T08:37:49
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### Describe the bug Datasets 2.18.0 - 3.5.0 has a dependency on dill < 0.3.9. This causes errors with dill >= 0.3.9. Could you please take a look into it and make it compatible? ### Steps to reproduce the bug 1. Install setuptools >= 2.18.0 2. Install dill >=0.3.9 3. Run pip check 4. Output: ERROR: pip's dependenc...
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Dataset uses excessive memory when loading files
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2025-04-13T21:09:49
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### Describe the bug Hi I am having an issue when loading a dataset. I have about 200 json files each about 1GB (total about 215GB). each row has a few features which are a list of ints. I am trying to load the dataset using `load_dataset`. The dataset is about 1.5M samples I use `num_proc=32` and a node with 378GB of...
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7,508
Iterating over Image feature columns is extremely slow
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2025-04-10T19:00:54
2025-04-15T17:57:08
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We are trying to load datasets where the image column stores `PIL.PngImagePlugin.PngImageFile` images. However, iterating over these datasets is extremely slow. What I have found: 1. It is the presence of the image column that causes the slowdown. Removing the column from the dataset results in blazingly fast (as expe...
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2,984,309,806
I_kwDODunzps6x4PQu
7,507
Front-end statistical data quantity deviation
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2025-04-10T02:51:38
2025-04-15T12:54:51
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### Describe the bug While browsing the dataset at https://huggingface.co/datasets/NeuML/wikipedia-20250123, I noticed that a dataset with nearly 7M entries was estimated to be only 4M in size—almost half the actual amount. According to the post-download loading and the dataset_info (https://huggingface.co/datasets/Ne...
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2,981,687,450
I_kwDODunzps6xuPCa
7,506
HfHubHTTPError: 429 Client Error: Too Many Requests for URL when trying to access Fineweb-10BT on 4A100 GPUs using SLURM
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2025-04-09T06:32:04
2025-06-29T06:04:59
null
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### Describe the bug I am trying to run some finetunings on 4 A100 GPUs using SLURM using axolotl training framework which in turn uses Huggingface's Trainer and Accelerate on [Fineweb-10BT](https://huggingface.co/datasets/HuggingFaceFW/fineweb), but I end up running into 429 Client Error: Too Many Requests for URL er...
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2,979,926,156
I_kwDODunzps6xnhCM
7,505
HfHubHTTPError: 403 Forbidden: None. Cannot access content at: https://hf.co/api/s3proxy
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2025-04-08T14:08:40
2025-04-08T14:08:40
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I have already logged in Huggingface using CLI with my valid token. Now trying to download the datasets using following code: from transformers import WhisperProcessor, WhisperForConditionalGeneration, WhisperTokenizer, Trainer, TrainingArguments, DataCollatorForSeq2Seq from datasets import load_dataset, Data...
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2,979,410,641
I_kwDODunzps6xljLR
7,504
BuilderConfig ParquetConfig(...) doesn't have a 'use_auth_token' key.
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2025-04-08T10:55:03
2025-06-28T09:18:09
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### Describe the bug Trying to run the following fine-tuning script (based on this page [here](https://github.com/huggingface/instruction-tuned-sd)): ``` ! accelerate launch /content/instruction-tuned-sd/finetune_instruct_pix2pix.py \ --pretrained_model_name_or_path=${MODEL_ID} \ --dataset_name=${DATASET_NAME...
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2,978,512,625
I_kwDODunzps6xiH7x
7,503
Inconsistency between load_dataset and load_from_disk functionality
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2025-04-08T03:46:22
2025-06-28T08:51:16
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## Issue Description I've encountered confusion when using `load_dataset` and `load_from_disk` in the datasets library. Specifically, when working offline with the gsm8k dataset, I can load it using a local path: ```python import datasets ds = datasets.load_dataset('/root/xxx/datasets/gsm8k', 'main') ``` output: ```t...
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2,977,453,814
I_kwDODunzps6xeFb2
7,502
`load_dataset` of size 40GB creates a cache of >720GB
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2025-04-07T16:52:34
2025-04-15T15:22:12
2025-04-15T15:22:11
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Hi there, I am trying to load a dataset from the Hugging Face Hub and split it into train and validation splits. Somehow, when I try to do it with `load_dataset`, it exhausts my disk quota. So, I tried manually downloading the parquet files from the hub and loading them as follows: ```python ds = DatasetDict( ...
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2,976,721,014
I_kwDODunzps6xbSh2
7,501
Nested Feature raises ArrowNotImplementedError: Unsupported cast using function cast_struct
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2025-04-07T12:35:39
2025-04-07T12:43:04
2025-04-07T12:43:03
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### Describe the bug `datasets.Features` seems to be unable to handle json file that contains fields of `list[dict]`. ### Steps to reproduce the bug ```json // test.json {"a": 1, "b": [{"c": 2, "d": 3}, {"c": 4, "d": 5}]} {"a": 5, "b": [{"c": 7, "d": 8}, {"c": 9, "d": 10}]} ``` ```python import json from datasets i...
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2,974,841,921
I_kwDODunzps6xUHxB
7,500
Make `with_format` correctly indicate that a `Dataset` is compatible with PyTorch's `Dataset` class
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2025-04-06T09:56:09
2026-08-09T23:15:15
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### Feature request Currently `datasets` does not correctly indicate to the Python type-checker (e.g. `pyright` / `Pylance`) that the output of `with_format` is compatible with PyTorch's `Dataloader` since it does not indicate that the HuggingFace `Dataset` is compatible with the PyTorch `Dataset` class. It would be g...
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2,973,489,126
PR_kwDODunzps6Rd4Zp
7,499
Added cache dirs to load and file_utils
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2025-04-04T22:36:04
2025-05-07T14:07:34
2025-05-07T14:07:34
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When adding "cache_dir" to datasets.load_dataset, the cache_dir gets lost in the function calls, changing the cache dir to the default path. This fixes a few of these instances.
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Extreme memory bandwidth.
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2025-04-03T11:09:08
2025-04-03T11:11:22
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### Describe the bug When I use hf datasets on 4 GPU with 40 workers I get some extreme memory bandwidth of constant ~3GB/s. However, if I wrap the dataset in `IterableDataset`, this issue is gone and the data also loads way faster (4x faster training on 1 worker). It seems like the workers don't share memory and b...
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2,968,553,693
I_kwDODunzps6w8Ijd
7,497
How to convert videos to images?
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### Feature request Does someone know how to return the images from videos? ### Motivation I am trying to use openpi(https://github.com/Physical-Intelligence/openpi) to finetune my Lerobot dataset(V2.0 and V2.1). I find that although the codedaset is v2.0, they are different. It seems like Lerobot V2.0 has two versi...
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Json builder: Allow features to override problematic Arrow types
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### Feature request In the JSON builder, use explicitly requested feature types before or while converting to Arrow. ### Motivation Working with JSON datasets is really hard because of Arrow. At the very least, it seems like it should be possible to work-around these problems by explicitly setting problematic colum...
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7,495
Columns in the dataset obtained though load_dataset do not correspond to the one in the dataset viewer since 3.4.0
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### Describe the bug I have noticed that on my dataset named [BrunoHays/Accueil_UBS](https://huggingface.co/datasets/BrunoHays/Accueil_UBS), since the version 3.4.0, every column except audio is missing when I load the dataset. Interestingly, the dataset viewer still shows the correct columns ### Steps to reproduce ...
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7,494
Broken links in pdf loading documentation
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### Describe the bug Hi, just a couple of small issues I ran into while reading the docs for [loading pdf data](https://huggingface.co/docs/datasets/main/en/document_load): 1. The link for the [`Create a pdf dataset`](https://huggingface.co/docs/datasets/main/en/document_load#pdffolder) points to https://huggingface....
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push_to_hub does not upload videos
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### Describe the bug Hello, I would like to upload a video dataset (some .mp4 files and some segments within them), i.e. rows correspond to subsequences from videos. Videos might be referenced by several rows. I created a dataset locally and it references the videos and the video readers can read them correctly. I u...
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Closes #7457
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This PR updates the documentation to include the HF_DATASETS_CACHE environment variable, which allows users to customize the cache location for datasets—similar to HF_HUB_CACHE for models.
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docs: update cache.mdx to include HF_DATASETS_CACHE documentation
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(refactor) remove redundant logic in _check_valid_index_key
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This PR contributes a minor refactor, in a small function in `src/datasets/formatting/formatting.py`. No change in logic. In the original code, there are separate if-conditionals for `isinstance(key, range)` and `isinstance(key, Iterable)`, with essentially the same logic. This PR combines these two using a sin...
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fix: loading of datasets from Disk(#7373)
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Fixes dataset loading from disk by ensuring that memory maps and streams are properly closed. For more details, see https://github.com/huggingface/datasets/issues/7373.
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Support underscore int read instruction
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close https://github.com/huggingface/datasets/issues/7481
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Write pdf in map
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Fix this error when mapping a PDF dataset ``` pyarrow.lib.ArrowInvalid: Could not convert <pdfplumber.pdf.PDF object at 0x13498ee40> with type PDF: did not recognize Python value type when inferring an Arrow data type ``` and also let map() outputs be lists of images or pdfs
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`shared_datadir` fixture is missing
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### Describe the bug Running the tests for the latest release fails due to missing `shared_datadir` fixture. ### Steps to reproduce the bug Running `pytest` while building a package for Arch Linux leads to these errors: ``` ==================================== ERRORS ==================================== _________ E...
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set dev version
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Support skip_trying_type
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This PR addresses Issue #7472 cc: @lhoestq
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Implement capability to restore non-nullability in Features
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This PR attempts to keep track of non_nullable pyarrow fields when converting a `pa.Schema` to `Features`. At the same time, when outputting the `arrow_schema`, the original non-nullable fields are restored. This allows for more consistent behavior and avoids breaking behavior as illustrated in #7479. I am by no mea...
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deal with python `10_000` legal number in slice syntax
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### Feature request ``` In [6]: ds = datasets.load_dataset("HuggingFaceH4/ultrachat_200k", split="train_sft[:1000]") In [7]: ds = datasets.load_dataset("HuggingFaceH4/ultrachat_200k", split="train_sft[:1_000]") [dozens of frames skipped] File /usr/local/lib/python3.10/dist-packages/datasets/arrow_reader.py:444, in _s...
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HF_DATASETS_CACHE ignored?
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### Describe the bug I'm struggling to get things to respect HF_DATASETS_CACHE. Rationale: I'm on a system that uses NFS for homedir, so downloading to NFS is expensive, slow, and wastes valuable quota compared to local disk. Instead, it seems to rely mostly on HF_HUB_CACHE. Current version: 3.2.1dev. In the process...
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Features.from_arrow_schema is destructive
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### Describe the bug I came across this, perhaps niche, bug where `Features` does not/cannot account for pyarrow's `nullable=False` option in Fields. Interestingly, I found that in regular "flat" fields this does not necessarily lead to conflicts, but when a non-nullable field is in a struct, an incompatibility arises...
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update fsspec 2025.3.0
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It appears there have been two releases of fsspec since this dependency was last updated, it would be great if Datasets could be updated so that it didn't hold back the usage of newer fsspec versions in consuming projects. PR based on https://github.com/huggingface/datasets/pull/7352
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What is the canonical way to compress a Dataset?
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Given that Arrow is the preferred backend for a Dataset, what is a user supposed to do if they want concurrent reads, concurrent writes AND on-disk compression for a larger dataset? Parquet would be the obvious answer except that there is no native support for writing sharded, parquet datasets concurrently [[1](https:...
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Priotitize json
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`datasets` should load the JSON data in https://huggingface.co/datasets/facebook/natural_reasoning, not the PDF
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IterableDataset's state_dict shard_example_idx is always equal to the number of samples in a shard
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2025-03-25T13:58:07
2025-12-12T16:15:37
2025-05-06T14:05:07
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### Describe the bug I've noticed a strange behaviour with Iterable state_dict: the value of shard_example_idx is always equal to the amount of samples in a shard. ### Steps to reproduce the bug I am reusing the example from the doc ```python from datasets import Dataset ds = Dataset.from_dict({"a": range(6)}).to_...
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Remove conditions for Python < 3.9
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2025-03-25T03:08:04
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This PR remove conditions for Python < 3.9.
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Webdataset data format problem
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2025-03-21T17:23:52
2025-03-21T19:19:58
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### Describe the bug Please see https://huggingface.co/datasets/ejschwartz/idioms/discussions/1 Error code: FileFormatMismatchBetweenSplitsError All three splits, train, test, and validation, use webdataset. But only the train split has more than one file. How can I force the other two splits to also be interpreted ...
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Label casting during `map` process is canceled after the `map` process
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2025-03-21T07:56:22
2025-04-10T05:11:15
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CONTRIBUTOR
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### Describe the bug When preprocessing a multi-label dataset, I introduced a step to convert int labels to float labels as [BCEWithLogitsLoss](https://pytorch.org/docs/stable/generated/torch.nn.BCEWithLogitsLoss.html) expects float labels and forward function of models in transformers package internally use `BCEWithL...
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Adding argument to `_get_data_files_patterns`
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2025-03-21T07:17:53
2025-03-27T12:30:52
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### Feature request How about adding if the user already know about the pattern? https://github.com/huggingface/datasets/blob/a256b85cbc67aa3f0e75d32d6586afc507cf535b/src/datasets/data_files.py#L252 ### Motivation While using this load_dataset people might use 10M of images for the local files. However, due to sear...
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Is it possible to shard a single-sharded IterableDataset?
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2025-03-21T04:33:37
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I thought https://github.com/huggingface/datasets/pull/7252 might be applicable but looking at it maybe not. Say we have a process, eg. a database query, that can return data in slightly different order each time. So, the initial query needs to be run by a single thread (not to mention running multiple times incurs mo...
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