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https://api.github.com/repos/huggingface/datasets/issues/7813 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7813/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7813/comments | https://api.github.com/repos/huggingface/datasets/issues/7813/events | https://github.com/huggingface/datasets/issues/7813 | 3,503,446,288 | I_kwDODunzps7Q0lkQ | 7,813 | Caching does not work when using python3.14 | {
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} | ### Describe the bug
Traceback (most recent call last):
File "/workspace/ctn.py", line 8, in <module>
ds = load_dataset(f"naver-clova-ix/synthdog-{lang}") # или "synthdog-zh" для китайского
File "/workspace/.venv/lib/python3.14/site-packages/datasets/load.py", line 1397, in load_dataset
builder_instance = load_dataset_builder(
path=path,
...<10 lines>...
**config_kwargs,
)
File "/workspace/.venv/lib/python3.14/site-packages/datasets/load.py", line 1185, in load_dataset_builder
builder_instance._use_legacy_cache_dir_if_possible(dataset_module)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/datasets/builder.py", line 612, in _use_legacy_cache_dir_if_possible
self._check_legacy_cache2(dataset_module) or self._check_legacy_cache() or None
~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/datasets/builder.py", line 485, in _check_legacy_cache2
config_id = self.config.name + "-" + Hasher.hash({"data_files": self.config.data_files})
~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/datasets/fingerprint.py", line 188, in hash
return cls.hash_bytes(dumps(value))
~~~~~^^^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/datasets/utils/_dill.py", line 120, in dumps
dump(obj, file)
~~~~^^^^^^^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/datasets/utils/_dill.py", line 114, in dump
Pickler(file, recurse=True).dump(obj)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/dill/_dill.py", line 428, in dump
StockPickler.dump(self, obj)
~~~~~~~~~~~~~~~~~^^^^^^^^^^^
File "/usr/lib/python3.14/pickle.py", line 498, in dump
self.save(obj)
~~~~~~~~~^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/datasets/utils/_dill.py", line 70, in save
dill.Pickler.save(self, obj, save_persistent_id=save_persistent_id)
~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/dill/_dill.py", line 422, in save
StockPickler.save(self, obj, save_persistent_id)
~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.14/pickle.py", line 572, in save
f(self, obj) # Call unbound method with explicit self
~^^^^^^^^^^^
File "/workspace/.venv/lib/python3.14/site-packages/dill/_dill.py", line 1262, in save_module_dict
StockPickler.save_dict(pickler, obj)
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
File "/usr/lib/python3.14/pickle.py", line 1064, in save_dict
self._batch_setitems(obj.items(), obj)
~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
TypeError: Pickler._batch_setitems() takes 2 positional arguments but 3 were given
### Steps to reproduce the bug
ds_train = ds["train"].map(lambda x: {**x, "lang": lang})
### Expected behavior
Fixed bugs
### Environment info
- `datasets` version: 4.2.0
- Platform: Linux-6.8.0-85-generic-x86_64-with-glibc2.39
- Python version: 3.14.0
- `huggingface_hub` version: 0.35.3
- PyArrow version: 21.0.0
- Pandas version: 2.3.3
- `fsspec` version: 2025.9.0
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} | ### Describe the bug
When I run the following python script using datasets I get a segfault.
```python
from datasets import load_dataset
from tqdm import tqdm
progress_bar = tqdm(total=(1000), unit='cols', desc='cols ')
progress_bar.update(1)
```
```
% lldb -- python3 crashmin.py
(lldb) target create "python3"
Current executable set to '/Users/ian/bug/venv/bin/python3' (arm64).
(lldb) settings set -- target.run-args "crashmin.py"
(lldb) r
Process 8095 launched: '/Users/ian/bug/venv/bin/python3' (arm64)
Process 8095 stopped
* thread #2, stop reason = exec
frame #0: 0x0000000100014b30 dyld`_dyld_start
dyld`_dyld_start:
-> 0x100014b30 <+0>: mov x0, sp
0x100014b34 <+4>: and sp, x0, #0xfffffffffffffff0
0x100014b38 <+8>: mov x29, #0x0 ; =0
Target 0: (Python) stopped.
(lldb) c
Process 8095 resuming
cols : 0% 0/1000 [00:00<?, ?cols/s]Process 8095 stopped
* thread #2, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x10)
frame #0: 0x0000000101783454 _datetime.cpython-313-darwin.so`delta_new + 188
_datetime.cpython-313-darwin.so`delta_new:
-> 0x101783454 <+188>: ldr x3, [x20, #0x10]
0x101783458 <+192>: adrp x0, 10
0x10178345c <+196>: add x0, x0, #0x6fc ; "seconds"
Target 0: (Python) stopped.
(lldb) bt
* thread #2, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x10)
* frame #0: 0x0000000101783454 _datetime.cpython-313-darwin.so`delta_new + 188
frame #1: 0x0000000100704b60 Python`type_call + 96
frame #2: 0x000000010067ba34 Python`_PyObject_MakeTpCall + 120
frame #3: 0x00000001007aae3c Python`_PyEval_EvalFrameDefault + 30236
frame #4: 0x000000010067c900 Python`PyObject_CallOneArg + 112
frame #5: 0x000000010070f0a0 Python`slot_tp_finalize + 116
frame #6: 0x000000010070c3b4 Python`subtype_dealloc + 788
frame #7: 0x00000001006c378c Python`insertdict + 756
frame #8: 0x00000001006db2b0 Python`_PyModule_ClearDict + 660
frame #9: 0x000000010080a9a8 Python`finalize_modules + 1772
frame #10: 0x0000000100809a44 Python`_Py_Finalize + 264
frame #11: 0x0000000100837630 Python`Py_RunMain + 252
frame #12: 0x0000000100837ef8 Python`pymain_main + 304
frame #13: 0x0000000100837f98 Python`Py_BytesMain + 40
frame #14: 0x000000019cfcc274 dyld`start + 2840
(lldb) register read x20
x20 = 0x0000000000000000
(lldb)
```
### Steps to reproduce the bug
Run the script above, and observe the segfault.
### Expected behavior
No segfault
### Environment info
```
% pip freeze datasets | grep -i datasets
datasets==4.2.0
(venv) 0 ~/bug 14:58:06
% pip freeze tqdm | grep -i tqdm
tqdm==4.67.1
(venv) 0 ~/bug 14:58:16
% python --version
Python 3.13.7
``` | null | {
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from datasets import load_dataset
on_bad_file = "error" # default
# on_bad_file = "warn" # warn and skip bad file
# on_bad_file = "skip" # skip bad file
ds = load_dataset(parquet_dataset_id, on_bad_file=on_bad_file)
``` | {
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} | [] | closed | false | null | [] | null | 1 | 2025-10-09T13:53:06 | 2025-10-09T14:01:57 | 2025-10-09T14:01:56 | MEMBER | null | null | null | null | There ~10 unnecessary `/api/datasets/user/dataset/revision`calls due to multithreading in data files resolution.
I disabled multithreading, which was actually not useful anymore since `HfFileSystem` has been using caching for a while now. | {
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} | List of formats and libraries we can use to load the data in `datasets`:
- [ ] DICOMs: pydicom
- [ ] NIfTIs: nibabel
- [ ] WFDB: wfdb
cc @zaRizk7 for viz
Feel free to comment / suggest other formats and libs you'd like to see or to share your interest in one of the mentioned format | null | {
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} | [] | open | false | null | [] | null | 0 | 2025-10-09T02:54:41 | 2025-10-09T02:57:42 | null | NONE | null | null | {
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} | Documentation link: https://huggingface.co/docs/datasets/en/package_reference/main_classes
Link to method (docstring present): https://github.com/huggingface/datasets/blob/6f2502c5a026caa89839713f6f7c8b958e5e83eb/src/datasets/arrow_dataset.py#L1029
The docstring is present for the function, but seems missing from the official documentation for the `Dataset` class on HuggingFace.
The method in question:
```python
@classmethod
def from_dict(
cls,
mapping: dict,
features: Optional[Features] = None,
info: Optional[DatasetInfo] = None,
split: Optional[NamedSplit] = None,
) -> "Dataset":
"""
Convert `dict` to a `pyarrow.Table` to create a [`Dataset`].
Important: a dataset created with from_dict() lives in memory
and therefore doesn't have an associated cache directory.
This may change in the future, but in the meantime if you
want to reduce memory usage you should write it back on disk
and reload using e.g. save_to_disk / load_from_disk.
Args:
mapping (`Mapping`):
Mapping of strings to Arrays or Python lists.
features ([`Features`], *optional*):
Dataset features.
info (`DatasetInfo`, *optional*):
Dataset information, like description, citation, etc.
split (`NamedSplit`, *optional*):
Name of the dataset split.
Returns:
[`Dataset`]
"""
``` | null | {
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https://api.github.com/repos/huggingface/datasets/issues/7801 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7801/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7801/comments | https://api.github.com/repos/huggingface/datasets/issues/7801/events | https://github.com/huggingface/datasets/pull/7801 | 3,496,388,063 | PR_kwDODunzps6swITn | 7,801 | Add parquet scan options and docs | {
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} | [] | closed | false | null | [] | null | 1 | 2025-10-08T18:04:52 | 2025-10-09T07:55:58 | 2025-10-09T07:55:56 | MEMBER | null | null | null | null | I added scan options, useful to control buffering and caching when streaming and docs, including how to select a subset of columns and apply filters | {
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https://api.github.com/repos/huggingface/datasets/issues/7800 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7800/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7800/comments | https://api.github.com/repos/huggingface/datasets/issues/7800/events | https://github.com/huggingface/datasets/pull/7800 | 3,494,747,495 | PR_kwDODunzps6sqkmT | 7,800 | Fix polars cast column image | {
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} | [] | open | false | null | [] | null | 1 | 2025-10-08T10:01:18 | 2025-10-10T15:31:59 | null | NONE | null | null | null | null | Fixes #7765
The problem here is that polars uses pyarrow large_string for images, while pandas and others just use the string type. This PR solves that and adds a test.
```python
import polars as pl
from datasets import Dataset
import pandas as pd
import pyarrow as pa
from pathlib import Path
shared_datadir = Path("tests/features/data")
image_path = str(shared_datadir / "test_image_rgb.jpg")
# Load via polars
df_polars = pl.DataFrame({"image_path": [image_path]})
dataset_polars = Dataset.from_polars(df_polars)
print("Polars DF is large string:", pa.types.is_large_string(df_polars.to_arrow().schema[0].type))
print("Polars DF is string:", pa.types.is_string(df_polars.to_arrow().schema[0].type))
# Load via pandas
df_pandas = pd.DataFrame({"image_path": [image_path]})
dataset_pandas = Dataset.from_pandas(df_pandas)
arrow_table_pd = pa.Table.from_pandas(df_pandas)
print("Pandas DF is large string", pa.types.is_large_string(arrow_table_pd.schema[0].type))
print("Pandas DF is string", pa.types.is_string(arrow_table_pd.schema[0].type))
```
Outputs:
```bash
Polars DF is large string: True
Polars DF is string: False
Pandas DF is large string False
Pandas DF is string True
```
| null | {
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https://api.github.com/repos/huggingface/datasets/issues/7799 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7799/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7799/comments | https://api.github.com/repos/huggingface/datasets/issues/7799/events | https://github.com/huggingface/datasets/pull/7799 | 3,487,791,741 | PR_kwDODunzps6sTJKA | 7,799 | Define CI future | {
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} | [] | closed | false | null | [] | null | 1 | 2025-10-06T15:15:45 | 2025-10-07T14:30:21 | 2025-10-07T14:30:19 | MEMBER | null | null | null | null | this should fix the CI which currently uses transformers on 3.9 while it's now unsupported | {
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https://api.github.com/repos/huggingface/datasets/issues/7798 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7798/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7798/comments | https://api.github.com/repos/huggingface/datasets/issues/7798/events | https://github.com/huggingface/datasets/issues/7798 | 3,484,470,782 | I_kwDODunzps7PsM3- | 7,798 | Audio dataset is not decoding on 4.1.1 | {
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} | [] | open | false | null | [] | null | 3 | 2025-10-05T06:37:50 | 2025-10-06T14:07:55 | null | NONE | null | null | {
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} | ### Describe the bug
The audio column remain as non-decoded objects even when accessing them.
```python
dataset = load_dataset("MrDragonFox/Elise", split = "train")
dataset[0] # see that it doesn't show 'array' etc...
```
Works fine with `datasets==3.6.0`
Followed the docs in
- https://huggingface.co/docs/datasets/en/audio_load
### Steps to reproduce the bug
```python
dataset = load_dataset("MrDragonFox/Elise", split = "train")
dataset[0] # see that it doesn't show 'array' etc...
```
### Expected behavior
It should decode when accessing the elemenet
### Environment info
4.1.1
ubuntu 22.04
Related
- https://github.com/huggingface/datasets/issues/7707 | null | {
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} | [] | closed | false | null | [] | null | 1 | 2025-10-01T10:46:01 | 2025-10-10T15:33:25 | 2025-10-10T15:33:25 | NONE | null | null | null | null | - Implemented TSV-based dataset loaders:
- WMT21Dataset (local_datasets/wmt21/wmt21_dataset.py)
- WMT22Dataset (local_datasets/wmt22/wmt22_dataset.py)
These classes load source-target pairs from .tsv files for train, validation, and test splits.
- Created sample dummy data for both datasets:
- dummy_data/train.tsv, dummy_data/validation.tsv, dummy_data/test.tsv
- Includes a few realistic example lines to allow CI and local tests to pass without downloading full datasets.
- Added automated tests for robust validation:
- tests/test_wmt21.py and tests/test_wmt22.py
- Checks that all splits load correctly, empty lines are ignored, and the number of examples matches the number of lines in the .tsv files.
- Edge cases handled: empty lines, malformed lines, extra tabs.
- Added README.md files for both datasets:
- Provides dataset structure, usage instructions, and placeholders for citation & license information.
- Ensures that other developers and reviewers can understand dataset usage immediately.
- Ensured easy local testing:
- Load datasets programmatically using WMT21Dataset / WMT22Dataset.
- Verified train/validation/test splits are correctly returned as Python dictionaries of Dataset objects.
-Provides initial support for WMT21 and WMT22 NLP/translation experiments.
-Allows contributors and reviewers to test dataset loading locally or in CI without downloading large datasets.
-Serves as a template to extend to other WMT datasets in the future.
Testing instructions:
```
# Activate your environment
pytest tests/test_wmt21.py -v
pytest tests/test_wmt22.py -v
```
```
from local_datasets.wmt21.wmt21_dataset import WMT21Dataset
from local_datasets.wmt22.wmt22_dataset import WMT22Dataset
# WMT21
wmt21 = WMT21Dataset("local_datasets/wmt21/dummy_data")
ds21 = wmt21.load()
print(ds21["train"][0])
print(ds21["validation"][0])
print(ds21["test"][0])
# WMT22
wmt22 = WMT22Dataset("local_datasets/wmt22/dummy_data")
ds22 = wmt22.load()
print(ds22["train"][0])
print(ds22["validation"][0])
print(ds22["test"][0])
``` | {
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https://api.github.com/repos/huggingface/datasets/issues/7796 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7796/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7796/comments | https://api.github.com/repos/huggingface/datasets/issues/7796/events | https://github.com/huggingface/datasets/pull/7796 | 3,470,616,799 | PR_kwDODunzps6rZjrW | 7,796 | Docs: fix typo, improve readability, add code comments | {
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} | [] | open | false | null | [] | null | 0 | 2025-09-30T18:34:16 | 2025-09-30T18:34:16 | null | NONE | null | null | null | null | What I did:
- Fixed a small typo in README to improve clarity
- Fixed repeated word "frameworks frameworks"
- Split long paragraphs into shorter sentences for readability
- Added # Example comments before code blocks for clarity
Why:
- Helps new users avoid confusion
How I tested:
- Checked locally in Markdown preview | null | {
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https://api.github.com/repos/huggingface/datasets/issues/7795 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7795/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7795/comments | https://api.github.com/repos/huggingface/datasets/issues/7795/events | https://github.com/huggingface/datasets/pull/7795 | 3,463,990,654 | PR_kwDODunzps6rDEce | 7,795 | Add pyarrow's binary view to features | {
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} | [] | closed | false | null | [] | null | 2 | 2025-09-29T09:12:55 | 2025-10-10T16:04:21 | 2025-10-10T16:04:21 | CONTRIBUTOR | null | null | null | null | Basically https://github.com/huggingface/datasets/pull/7718 just for binary view instead of string view | {
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https://api.github.com/repos/huggingface/datasets/issues/7794 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7794/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7794/comments | https://api.github.com/repos/huggingface/datasets/issues/7794/events | https://github.com/huggingface/datasets/pull/7794 | 3,460,793,966 | PR_kwDODunzps6q4XyU | 7,794 | Fix nested data conversions error in parquet loading (fixes #7793) | {
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} | [] | open | false | null | [] | null | 6 | 2025-09-27T22:04:13 | 2025-10-01T16:56:20 | null | NONE | null | null | null | null | Fixes #7793
## Problem
Loading datasets with deeply nested structures (like `metr-evals/malt-public`) fails with:
ArrowNotImplementedError: Nested data conversions not implemented for chunked array outputs
This occurs when parquet files contain nested data (lists, structs, maps) that exceed PyArrow's 16MB chunk limit.
## Root Cause
PyArrow's C++ implementation explicitly rejects nested data conversions when data is split across multiple chunks. The limitation exists in the `WrapIntoListArray` function where repetition levels cannot be reconstructed across chunk boundaries.
## Solution
- **Fallback mechanism**: Catches the specific PyArrow error and switches to non-chunked reading
- **Selective optimization**: Only combines chunks for problematic nested columns to minimize memory impact
- **Manual batching**: Maintains batching behavior even in fallback mode
- **Backward compatibility**: Zero impact on existing datasets
## Implementation Details
- Added `_is_nested_type()` helper to detect nested PyArrow types
- Added `_handle_nested_chunked_conversion()` for selective chunk combining
- Modified `_generate_tables()` to catch and handle the specific error
- Preserves all existing error handling and logging
## Testing
- [x] No regressions: Normal parquet datasets continue working
- [x] Code follows existing patterns in the datasets codebase
- [x] tested by original reporter (gated dataset access needed)
**Note**: This fix is based on thorough research of PyArrow limitations and similar issues in the ecosystem. While we cannot test with the original dataset due to access restrictions, the implementation follows established patterns for handling this PyArrow limitation.
## Request for Testing
@neevparikh Could you please test this fix with your original failing dataset? The implementation should resolve the nested data conversion error you encountered. | null | {
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https://api.github.com/repos/huggingface/datasets/issues/7793 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7793/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7793/comments | https://api.github.com/repos/huggingface/datasets/issues/7793/events | https://github.com/huggingface/datasets/issues/7793 | 3,459,496,971 | I_kwDODunzps7OM7wL | 7,793 | Cannot load dataset, fails with nested data conversions not implemented for chunked array outputs | {
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} | [] | open | false | null | [] | null | 1 | 2025-09-27T01:03:12 | 2025-09-27T21:35:31 | null | NONE | null | null | {
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} | ### Describe the bug
Hi! When I load this dataset, it fails with a pyarrow error. I'm using datasets 4.1.1, though I also see this with datasets 4.1.2
To reproduce:
```
import datasets
ds = datasets.load_dataset(path="metr-evals/malt-public", name="irrelevant_detail")
```
Error:
```
Traceback (most recent call last):
File "/Users/neev/scratch/.venv/lib/python3.13/site-packages/datasets/builder.py", line 1815, in _prepare_split_single
for _, table in generator:
^^^^^^^^^
File "/Users/neev/scratch/.venv/lib/python3.13/site-packages/datasets/packaged_modules/parquet/parquet.py", line 93, in _generate_tables
for batch_idx, record_batch in enumerate(
~~~~~~~~~^
parquet_fragment.to_batches(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...<5 lines>...
)
^
):
^
File "pyarrow/_dataset.pyx", line 3904, in _iterator
File "pyarrow/_dataset.pyx", line 3494, in pyarrow._dataset.TaggedRecordBatchIterator.__next__
File "pyarrow/error.pxi", line 155, in pyarrow.lib.pyarrow_internal_check_status
File "pyarrow/error.pxi", line 92, in pyarrow.lib.check_status
pyarrow.lib.ArrowNotImplementedError: Nested data conversions not implemented for chunked array outputs
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/Users/neev/scratch/test_hf.py", line 3, in <module>
ds = datasets.load_dataset(path="metr-evals/malt-public", name="irrelevant_detail")
File "/Users/neev/scratch/.venv/lib/python3.13/site-packages/datasets/load.py", line 1412, in load_dataset
builder_instance.download_and_prepare(
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
download_config=download_config,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
...<3 lines>...
storage_options=storage_options,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
)
^
File "/Users/neev/scratch/.venv/lib/python3.13/site-packages/datasets/builder.py", line 894, in download_and_prepare
self._download_and_prepare(
~~~~~~~~~~~~~~~~~~~~~~~~~~^
dl_manager=dl_manager,
^^^^^^^^^^^^^^^^^^^^^^
...<2 lines>...
**download_and_prepare_kwargs,
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
)
^
File "/Users/neev/scratch/.venv/lib/python3.13/site-packages/datasets/builder.py", line 970, in _download_and_prepare
self._prepare_split(split_generator, **prepare_split_kwargs)
~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/neev/scratch/.venv/lib/python3.13/site-packages/datasets/builder.py", line 1702, in _prepare_split
for job_id, done, content in self._prepare_split_single(
~~~~~~~~~~~~~~~~~~~~~~~~~~^
gen_kwargs=gen_kwargs, job_id=job_id, **_prepare_split_args
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
):
^
File "/Users/neev/scratch/.venv/lib/python3.13/site-packages/datasets/builder.py", line 1858, in _prepare_split_single
raise DatasetGenerationError("An error occurred while generating the dataset") from e
datasets.exceptions.DatasetGenerationError: An error occurred while generating the dataset
```
### Steps to reproduce the bug
To reproduce:
```
import datasets
ds = datasets.load_dataset(path="metr-evals/malt-public", name="irrelevant_detail")
```
### Expected behavior
The dataset loads
### Environment info
Datasets: 4.1.1
Python: 3.13
Platform: Macos | null | {
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https://api.github.com/repos/huggingface/datasets/issues/7792 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7792/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7792/comments | https://api.github.com/repos/huggingface/datasets/issues/7792/events | https://github.com/huggingface/datasets/issues/7792 | 3,456,802,210 | I_kwDODunzps7OCp2i | 7,792 | Concatenate IterableDataset instances and distribute underlying shards in a RoundRobin manner | {
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} | ### Feature request
I would like to be able to concatenate multiple `IterableDataset` with possibly different features. I would like to then be able to stream the results in parallel (both using DDP and multiple workers in the pytorch DataLoader). I want the merge of datasets to be well balanced between the different processes.
### Motivation
I want to train a model on a combination of datasets, which I can convert to a single representation. This applies to converting different datasets items to the same Python class, as using a tokenizer on multiple modalities.
Assuming that my original datasets are not necessarily well balanced as they may have different size and thus different number of shards, I would like the merged dataset to be distributed evenly over the multiple processes. I don't mind if it's not perfectly balanced, and as result, some workers of the torch DataLoader do nothing, as long as the DDP is properly handled causing no deadlock.
### What I've tried
I've tried the two functions already provided in datasets, namely `interleave_datasets` and `concatenate_datasets`.
- Interleave seems to be the best approach of what I'm trying to do. However, it doesn't suit my purpose because as I understand it, it stops as soon as one of the dataset source is exhausted, or repeat the smallest source items until the largest is exhausted. I would like something in-between, similarly to what [roundrobin does](https://more-itertools.readthedocs.io/en/stable/api.html#more_itertools.roundrobin).
- Concatenate does not mix the data enough and one dataset may be overrepresented in some early batches.
Let's consider we have 3 datasets composed of different number of shards as follow [[s0_0, s0_1], [s1_0], [s2_0, s2_1, s2_3]], where s denotes the underlying shard, the first index the dataset and the second the shard number.
If we request 3 shards in the `shard_data_source` we should obtain the following:
index 0 gets s0_0 s2_0
index 1 gets s0_1 s2_1
index 2 gets s1_0 s2_3
I started implementing the following, but I'm afraid my sharding logic is incorrect.
```python
from copy import deepcopy
from itertools import chain, islice
import datasets
import numpy as np
from datasets import IterableDataset
from datasets.iterable_dataset import _BaseExamplesIterable
from more_itertools import roundrobin
class MixMultiSourcesExampleIterable(_BaseExamplesIterable):
def __init__(self, ex_iterables: list[_BaseExamplesIterable]):
super().__init__()
self.ex_iterables = ex_iterables
def _init_state_dict(self) -> dict:
self._state_dict = {
"ex_iterables": [ex_iterable._init_state_dict() for ex_iterable in self.ex_iterables],
"type": self.__class__.__name__,
}
return self._state_dict
@property
def num_shards(self) -> int:
return sum(ex_iterable.num_shards for ex_iterable in self.ex_iterables)
def __iter__(self):
yield from roundrobin(*self.ex_iterables)
def shuffle_data_sources(self, generator: np.random.Generator) -> "MixMultiSourcesExampleIterable":
"""Shuffle the list of examples iterable, as well as each underlying examples iterable."""
rng = deepcopy(generator)
ex_iterables = list(self.ex_iterables)
rng.shuffle(ex_iterables)
ex_iterables = [ex_iterable.shuffle_data_sources(generator) for ex_iterable in ex_iterables]
return MixMultiSourcesExampleIterable(ex_iterables)
def shard_data_sources(self, num_shards: int, index: int, contiguous=True) -> "MixMultiSourceExampleIterable":
"""Shard the underlying iterables in a roundrobin manner.
Let's consider we have our iterables as [[s0_0, s0_1], [s1_0], [s2_0, s2_1, s2_3]],
and we request 3 shards.
index 0 gets s0_0 s2_0
index 1 gets s0_1 s2_1
index 2 gets s1_0 s2_3
"""
return MixMultiSourcesExampleIterable(
list(
islice(
# flatten all underlying iterables
chain.from_iterable([ex_iterable.shard_data_sources(1, 0) for ex_iterable in self.ex_iterables]),
# offset the starting point by the index
index,
# take over the full list, so exhaust the iterators
None,
# step by the number of shards requested
num_shards,
)
)
)
def mix_dataset(iterable_datasets: list[datasets.IterableDataset]) -> IterableDataset:
ex_iterable = MixMultiSourcesExampleIterable([ds._ex_iterable for ds in iterable_datasets])
return IterableDataset(
ex_iterable, distributed=iterable_datasets[0]._distributed, formatting=iterable_datasets[0]._formatting
)
```
### Questions
- Am I missing something? Is there a way to use `interleave_datasets` or `concatenate_datasets` to fit my purpose?
- Would it be the right approach to spread the maximum number of underlying shards across my different processes?
### Your contribution
As much as I can. | null | {
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} | [] | open | false | null | [] | null | 1 | 2025-09-25T15:02:46 | 2025-10-06T10:42:23 | null | NONE | null | null | null | null | **Task Done:**
- Resolve issue #7788 : Add the missing argument mapping in Dataset.to_sql (`src/datasets/arrow_dataset.py`)
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https://api.github.com/repos/huggingface/datasets/issues/7789 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7789/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7789/comments | https://api.github.com/repos/huggingface/datasets/issues/7789/events | https://github.com/huggingface/datasets/pull/7789 | 3,453,273,059 | PR_kwDODunzps6qfZUc | 7,789 | fix link for rotten_tomatoes dataset | {
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https://api.github.com/repos/huggingface/datasets/issues/7788 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7788/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7788/comments | https://api.github.com/repos/huggingface/datasets/issues/7788/events | https://github.com/huggingface/datasets/issues/7788 | 3,450,913,796 | I_kwDODunzps7NsMQE | 7,788 | `Dataset.to_sql` doesn't utilize `num_proc` | {
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} | [] | open | false | null | [] | null | 0 | 2025-09-24T20:34:47 | 2025-09-24T20:35:01 | null | NONE | null | null | {
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} | The underlying `SqlDatasetWriter` has `num_proc` as an available argument [here](https://github.com/huggingface/datasets/blob/5dc1a179783dff868b0547c8486268cfaea1ea1f/src/datasets/io/sql.py#L63) , but `Dataset.to_sql()` does not accept it, therefore it is always using one process for the SQL conversion. | null | {
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https://api.github.com/repos/huggingface/datasets/issues/7787 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7787/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7787/comments | https://api.github.com/repos/huggingface/datasets/issues/7787/events | https://github.com/huggingface/datasets/pull/7787 | 3,450,858,674 | PR_kwDODunzps6qXRo- | 7,787 | feat: avoid some copies in torch formatter | {
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} | [] | closed | false | null | [] | null | 2 | 2025-09-24T20:19:44 | 2025-09-26T15:04:25 | 2025-09-26T15:04:23 | CONTRIBUTOR | null | null | null | null | ## perf: reduce copies in TorchFormatter
This PR make changes the torch formatter to avoid unnecessary copies and casts when converting decoded batches to tensors.
Because many arrays are already in a torch-friendly memory layout and dtype, we can do zero‑copy conversions (`torch.from_numpy`) and only fall back to `as_tensor` when a dtype/device change is required. We also consolidate lists of same‑shape tensors with a cheap `stack` only when safe.
Why it helps
- Avoids extra materialization and dtype churn during batched map and indexing.
- Preserves API and outputs; only changes internal conversion logic.
Small benchmark script (based on https://github.com/huggingface/datasets/issues/6104)
```python
import time
from datasets import load_dataset
def main():
dataset = load_dataset("NightMachinery/hf_datasets_bug1")
dataset = dataset["train"] if "train" in dataset else dataset
t0 = time.time()
dataset.set_format(type="torch")
# identity map with small batches
dataset = dataset.map(lambda x: x, batched=True, batch_size=20)
# force materialization
data = dataset[:300]
print(len(data.keys()))
t1 = time.time()
print(f"Duration: {t1 - t0:.2f} s")
if __name__ == "__main__":
main()
```
Without changes
```bash
uv run bench.py
```
```bash
# 303
# Duration: 7.26 s
```
With changes
```bash
uv run bench.py
```
```bash
# 303
# Duration: 4.43 s
```
# Updated reproduction scripts
Below are some simple test cases using `main` and this `refactor-torch-formatter` branch. I've included the two scripts and output when running on a local machine.
```python
# /// script
# requires-python = ">=3.10"
# dependencies = [
# "torch",
# "datasets",
# "pillow",
# ]
#
# [tool.uv.sources]
# datasets = { git = "https://github.com/huggingface/datasets.git" }
# ///
import time
import random
import numpy as np
from PIL import Image
from datasets import Dataset, load_dataset
import torch
def create_mock_images_dataset(num_samples=5000):
"""Create a deterministic mock dataset with PIL images."""
random.seed(42)
np.random.seed(42)
images = []
labels = []
for i in range(num_samples):
# Create deterministic RGB image
width, height = 64, 64
rgb_array = np.random.randint(0, 256, (height, width, 3), dtype=np.uint8)
image = Image.fromarray(rgb_array)
images.append(image)
labels.append(i % 10) # 10 classes
return Dataset.from_dict({"image": images, "label": labels})
def create_mock_text_dataset(num_samples=5000):
"""Create a deterministic mock dataset with text."""
random.seed(42)
words = ["apple", "banana", "cherry", "date", "elderberry", "fig", "grape", "honeydew"]
texts = []
labels = []
for i in range(num_samples):
# Create deterministic text
text_length = 5 + (i % 20) # 5-24 words
text = " ".join(random.choices(words, k=text_length))
texts.append(text)
labels.append(i % 3) # 3 classes
return Dataset.from_dict({"text": texts, "label": labels})
def create_mock_ints_dataset(num_samples=5000):
"""Create a deterministic mock dataset with integers."""
random.seed(42)
data = []
labels = []
for i in range(num_samples):
# Create deterministic integer arrays
arr = [random.randint(0, 1000) for _ in range(50)] # 50 integers each
data.append(arr)
labels.append(i % 5) # 5 classes
return Dataset.from_dict({"data": data, "label": labels})
def create_mock_floats_dataset(num_samples=5000):
"""Create a deterministic mock dataset with floats."""
random.seed(42)
data = []
labels = []
for i in range(num_samples):
# Create deterministic float arrays
arr = [random.uniform(0.0, 100.0) for _ in range(30)] # 30 floats each
data.append(arr)
labels.append(i % 4) # 4 classes
return Dataset.from_dict({"data": data, "label": labels})
def benchmark_dataset(name, dataset, num_samples=1000):
"""Benchmark dataset access speed."""
print(f"\n=== {name} Dataset Benchmark ===")
t0 = time.time()
dataset.set_format(type="torch")
# identity map with small batches
dataset = dataset.map(lambda x: x, batched=True, batch_size=20)
# force materialization
data = dataset[:num_samples]
print(f"Keys: {list(data.keys())}")
print(f"Sample count: {len(data[list(data.keys())[0]])}")
t1 = time.time()
print(f"Duration: {t1 - t0:.2f} s")
print(f"Speed: {num_samples / (t1 - t0):.1f} samples/s")
def main():
# PIL Images benchmark
images_dataset = create_mock_images_dataset()
benchmark_dataset("PIL Images", images_dataset)
# Text benchmark
text_dataset = create_mock_text_dataset()
benchmark_dataset("Text", text_dataset)
# Integers benchmark
ints_dataset = create_mock_ints_dataset()
benchmark_dataset("Integers", ints_dataset)
# Floats benchmark
floats_dataset = create_mock_floats_dataset()
benchmark_dataset("Floats", floats_dataset)
if __name__ == "__main__":
main()
```
output
```bash
uv run --refresh example1.py
```
```text
=== PIL Images Dataset Benchmark ===
Map: 0%| | 0/5000 [00:00<?, ? examples/s]/Users/drbh/.cache/uv/environments-v2/example1-2aca1a30e84bdead/lib/python3.10/site-packages/datasets/features/image.py:352: UserWarning: Downcasting array dtype int64 to uint8 to be compatible with 'Pillow'
warnings.warn(f"Downcasting array dtype {dtype} to {dest_dtype} to be compatible with 'Pillow'")
Map: 100%|█████████████████████████████████████████████| 5000/5000 [00:01<00:00, 3669.15 examples/s]
Keys: ['image', 'label']
Sample count: 1000
Duration: 2.14 s
Speed: 466.5 samples/s
=== Text Dataset Benchmark ===
Map: 100%|███████████████████████████████████████████| 5000/5000 [00:00<00:00, 141327.04 examples/s]
Keys: ['text', 'label']
Sample count: 1000
Duration: 0.04 s
Speed: 27004.3 samples/s
=== Integers Dataset Benchmark ===
Map: 100%|███████████████████████████████████████████| 5000/5000 [00:00<00:00, 112904.90 examples/s]
Keys: ['data', 'label']
Sample count: 1000
Duration: 0.05 s
Speed: 21680.6 samples/s
=== Floats Dataset Benchmark ===
Map: 100%|███████████████████████████████████████████| 5000/5000 [00:00<00:00, 104084.25 examples/s]
Keys: ['data', 'label']
Sample count: 1000
Duration: 0.05 s
Speed: 20215.1 samples/s
```
and this branch specifically
```python
# /// script
# requires-python = ">=3.10"
# dependencies = [
# "torch",
# "datasets",
# "pillow",
# ]
#
# [tool.uv.sources]
# datasets = { git = "https://github.com/huggingface/datasets.git", rev = "refactor-torch-formatter" }
# ///
import time
import random
import numpy as np
from PIL import Image
from datasets import Dataset, load_dataset
import torch
def create_mock_images_dataset(num_samples=5000):
"""Create a deterministic mock dataset with PIL images."""
random.seed(42)
np.random.seed(42)
images = []
labels = []
for i in range(num_samples):
# Create deterministic RGB image
width, height = 64, 64
rgb_array = np.random.randint(0, 256, (height, width, 3), dtype=np.uint8)
image = Image.fromarray(rgb_array)
images.append(image)
labels.append(i % 10) # 10 classes
return Dataset.from_dict({"image": images, "label": labels})
def create_mock_text_dataset(num_samples=5000):
"""Create a deterministic mock dataset with text."""
random.seed(42)
words = [
"apple",
"banana",
"cherry",
"date",
"elderberry",
"fig",
"grape",
"honeydew",
]
texts = []
labels = []
for i in range(num_samples):
# Create deterministic text
text_length = 5 + (i % 20) # 5-24 words
text = " ".join(random.choices(words, k=text_length))
texts.append(text)
labels.append(i % 3) # 3 classes
return Dataset.from_dict({"text": texts, "label": labels})
def create_mock_ints_dataset(num_samples=5000):
"""Create a deterministic mock dataset with integers."""
random.seed(42)
data = []
labels = []
for i in range(num_samples):
# Create deterministic integer arrays
arr = [random.randint(0, 1000) for _ in range(50)] # 50 integers each
data.append(arr)
labels.append(i % 5) # 5 classes
return Dataset.from_dict({"data": data, "label": labels})
def create_mock_floats_dataset(num_samples=5000):
"""Create a deterministic mock dataset with floats."""
random.seed(42)
data = []
labels = []
for i in range(num_samples):
# Create deterministic float arrays
arr = [random.uniform(0.0, 100.0) for _ in range(30)] # 30 floats each
data.append(arr)
labels.append(i % 4) # 4 classes
return Dataset.from_dict({"data": data, "label": labels})
def benchmark_dataset(name, dataset, num_samples=1000):
"""Benchmark dataset access speed."""
print(f"\n=== {name} Dataset Benchmark ===")
t0 = time.time()
dataset.set_format(type="torch")
# identity map with small batches
dataset = dataset.map(lambda x: x, batched=True, batch_size=20)
# force materialization
data = dataset[:num_samples]
print(f"Keys: {list(data.keys())}")
print(f"Sample count: {len(data[list(data.keys())[0]])}")
t1 = time.time()
print(f"Duration: {t1 - t0:.2f} s")
print(f"Speed: {num_samples / (t1 - t0):.1f} samples/s")
def main():
# PIL Images benchmark
images_dataset = create_mock_images_dataset()
benchmark_dataset("PIL Images", images_dataset)
# Text benchmark
text_dataset = create_mock_text_dataset()
benchmark_dataset("Text", text_dataset)
# Integers benchmark
ints_dataset = create_mock_ints_dataset()
benchmark_dataset("Integers", ints_dataset)
# Floats benchmark
floats_dataset = create_mock_floats_dataset()
benchmark_dataset("Floats", floats_dataset)
if __name__ == "__main__":
main()
```
```bash
uv run --refresh example2.py
```
```text
Updated https://github.com/huggingface/datasets.git (2cb64d1b6503afb49d822b20979760efe4519d03)
Built datasets @ git+https://github.com/huggingface/datasets.git@2cb64d1b6503afb49d822b20979760efe
Uninstalled 1 package in 20ms
Installed 1 package in 5ms
=== PIL Images Dataset Benchmark ===
Map: 0%| | 0/5000 [00:00<?, ? examples/s]/Users/drbh/.cache/uv/environments-v2/example2-d4af608668b706ec/lib/python3.10/site-packages/datasets/features/image.py:352: UserWarning: Downcasting array dtype int64 to uint8 to be compatible with 'Pillow'
warnings.warn(f"Downcasting array dtype {dtype} to {dest_dtype} to be compatible with 'Pillow'")
Map: 100%|█████████████████████████████████████████████| 5000/5000 [00:01<00:00, 3645.14 examples/s]
Keys: ['image', 'label']
Sample count: 1000
Duration: 2.04 s
Speed: 491.2 samples/s
=== Text Dataset Benchmark ===
Map: 100%|████████████████████████████████████████████████████| 5000/5000 [00:00<00:00, 169877.28 examples/s]
Keys: ['text', 'label']
Sample count: 1000
Duration: 0.03 s
Speed: 32236.1 samples/s
=== Integers Dataset Benchmark ===
Map: 100%|████████████████████████████████████████████████████| 5000/5000 [00:00<00:00, 131940.33 examples/s]
Keys: ['data', 'label']
Sample count: 1000
Duration: 0.04 s
Speed: 25493.3 samples/s
=== Floats Dataset Benchmark ===
Map: 100%|████████████████████████████████████████████████████| 5000/5000 [00:00<00:00, 120621.64 examples/s]
Keys: ['data', 'label']
Sample count: 1000
Duration: 0.04 s
Speed: 23370.6 samples/s
``` | {
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https://api.github.com/repos/huggingface/datasets/issues/7786 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7786/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7786/comments | https://api.github.com/repos/huggingface/datasets/issues/7786/events | https://github.com/huggingface/datasets/pull/7786 | 3,448,506,148 | PR_kwDODunzps6qPTgs | 7,786 | Sample without replacement option when interleaving datasets | {
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} | [] | closed | false | null | [] | null | 8 | 2025-09-24T09:18:14 | 2025-10-07T14:50:16 | 2025-10-07T14:50:16 | CONTRIBUTOR | null | null | null | null | Right now, `interleave_datasets` function with probabilities will sample with replacement. The PR adds the ability to sample without replacement.
```
import datasets
# Create datasets of different sizes to test exhaustion
data_a = [{"value": i, "source": "A"} for i in range(5)]
data_b = [{"value": i, "source": "B"} for i in range(10, 15)]
ds_a = datasets.Dataset.from_list(data_a).to_iterable_dataset()
ds_b = datasets.Dataset.from_list(data_b).to_iterable_dataset()
# Interleave with probabilities
ds_interleaved = datasets.interleave_datasets(
[ds_a, ds_b],
probabilities=[0.6, 0.4],
seed=42,
stopping_strategy="all_exhausted",
sample_with_replacement=True,
)
for i, example in enumerate(ds_interleaved):
print(f"Sample:{i}: value:{example['value']:02d} source:{example['source']}")
```
In this example, `sample_with_replacement=True` and it prints:
```
Sample:0: value:10 source:B
Sample:1: value:00 source:A
Sample:2: value:11 source:B
Sample:3: value:12 source:B
Sample:4: value:01 source:A
Sample:5: value:13 source:B
Sample:6: value:14 source:B
Sample:7: value:10 source:B
Sample:8: value:02 source:A
Sample:9: value:03 source:A
Sample:10: value:04 source:A
```
Note that sample with value:10 source: B is sampled twice (Sample:0 and Sample:7)
Re-running with `sample_with_replacement=False` in prints:
```
Sample:0: value:10 source:B
Sample:1: value:00 source:A
Sample:2: value:11 source:B
Sample:3: value:12 source:B
Sample:4: value:01 source:A
Sample:5: value:13 source:B
Sample:6: value:14 source:B
Sample:7: value:02 source:A
Sample:8: value:03 source:A
Sample:9: value:04 source:A
```
Note that we don't see any repeated items. | {
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} | [] | open | false | null | [] | null | 2 | 2025-09-22T09:06:52 | 2025-09-23T09:57:37 | null | CONTRIBUTOR | null | null | null | null | This PR fixes issue #7745.
Who can review:
@lhoestq | null | {
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} | [] | closed | false | null | [] | null | 2 | 2025-09-18T14:45:20 | 2025-10-01T13:56:05 | 2025-10-01T13:56:03 | CONTRIBUTOR | null | null | null | null | Related to https://github.com/huggingface/huggingface_hub/issues/3340.
This PR adapts `datasets` to be compatible with both huggingface_hub v0.x and v1.x.
In practice nothing else should change (I've checked the codebase). The `HfHubHTTPError` is a base error defined in `huggingface_hub` that inherits from `requests.HTTPError` in v0.x and will inherit from `httpx.HTTPError` in v1.x. It has been introduced ~2 years ago so it's fine to use it right now (i.e. no need to wait for v1.x release or bump minimal version).
Most of the changes have been around the test suite to make sure that tests are passing with both `requests` and `httpx` backends. Mid-term it would be good to completely remove the `requests` dependency from `datasets` but that's an orthogonal topic. | {
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} | dataset: https://huggingface.co/datasets/NortheasternUniversity/big_patent
When I try to load it with the datasets library, it fails with:
RuntimeError: Dataset scripts are no longer supported, but found big_patent.py
Could you please publish a Parquet/Arrow export of BIGPATENT on the Hugging Face so that it can be accessed with datasets>=4.x.
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https://api.github.com/repos/huggingface/datasets/issues/7778 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7778/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7778/comments | https://api.github.com/repos/huggingface/datasets/issues/7778/events | https://github.com/huggingface/datasets/pull/7778 | 3,425,917,119 | PR_kwDODunzps6pDkX- | 7,778 | [FIX] force spawning pool for MacOS | {
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} | [] | open | false | null | [] | null | 2 | 2025-09-17T11:38:38 | 2025-09-18T17:04:45 | null | NONE | null | null | null | null | This PR gets multiprocessing to work on mac os:
```python
from datasets import load_dataset
ds = load_dataset("fka/awesome-chatgpt-prompts", split="train").take(100)
ds = ds.map(lambda x: x, num_proc=4)
ds.push_to_hub("burtenshaw/dataset-test", num_proc=4)
``` | null | {
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https://api.github.com/repos/huggingface/datasets/issues/7777 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7777/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7777/comments | https://api.github.com/repos/huggingface/datasets/issues/7777/events | https://github.com/huggingface/datasets/issues/7777 | 3,424,462,082 | I_kwDODunzps7MHSUC | 7,777 | push_to_hub not overwriting but stuck in a loop when there are existing commits | {
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} | ### Describe the bug
`get_deletions_and_dataset_card` stuck at error a commit has happened error since push to hub for http error 412 for tag 4.1.0. The error does not exists in 4.0.0.
### Steps to reproduce the bug
Create code to use push_to_hub, ran twice each time with different content for datasets.Dataset.
The code will stuck in time.sleep loop for `get_deletions_and_dataset_card`. If error is explicitly printed, the error is HTTP 412.
### Expected behavior
New datasets overwrite existing one on repo.
### Environment info
datasets 4.1.0 | {
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https://api.github.com/repos/huggingface/datasets/issues/7776 | https://api.github.com/repos/huggingface/datasets | https://api.github.com/repos/huggingface/datasets/issues/7776/labels{/name} | https://api.github.com/repos/huggingface/datasets/issues/7776/comments | https://api.github.com/repos/huggingface/datasets/issues/7776/events | https://github.com/huggingface/datasets/pull/7776 | 3,420,364,069 | PR_kwDODunzps6ow4yI | 7,776 | [docs] Fix broken WebDataset link on “Create a video dataset” page | {
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Fix the "WebDataset documentation" link on the Create a video dataset page to point
to the correct section on the video load guide.
### Why
The link currently points to an external repo, but the Hugging Face docs
have an internal "WebDataset" section under video_load.
### How
- docs/source/video_dataset.mdx: updated link to
`https://huggingface.co/docs/datasets/main/en/video_load#webdataset`
### Issue
Fixes #7699
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```
columns_to_return = ['input_ids','attention_mask', 'start_positions', 'end_positions']
train_ds.set_format(type='tf', columns=columns_to_return)
```
`train_ds`:
```
train_ds type: <class 'datasets.arrow_dataset.Dataset'>, shape: (1000, 9)
columns: ['question', 'sentences', 'answer', 'str_idx', 'end_idx', 'input_ids', 'attention_mask', 'start_positions', 'end_positions']
features:{'question': Value('string'), 'sentences': Value('string'), 'answer': Value('string'), 'str_idx': Value('int64'), 'end_idx': Value('int64'), 'input_ids': List(Value('int32')), 'attention_mask': List(Value('int8')), 'start_positions': Value('int64'), 'end_positions': Value('int64')}
```
`train_ds_tensor = train_ds['start_positions'].to_tensor(shape=(-1,1))` hits the following error:
```
AttributeError: 'Column' object has no attribute 'to_tensor'
```
`tf.reshape(train_ds['start_positions'], shape=[-1,1])` hits the following error:
```
TypeError: Scalar tensor has no `len()`
``` | null | {
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} | [] | closed | false | null | [] | null | 5 | 2025-09-14T06:40:50 | 2025-09-17T16:51:28 | 2025-09-17T16:51:28 | CONTRIBUTOR | null | null | null | null | Fixes a case when concatenating or interleaving datasets with `with_format(...)` call was slower.
Details here: https://github.com/huggingface/datasets/issues/6637
@lhoestq I tried to minimize the duplication between iter and iter_arrow methods, not sure if this is against the design, can separate those if needed. | {
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} | [] | open | false | null | [] | null | 1 | 2025-09-13T17:37:09 | 2025-09-28T12:43:04 | null | CONTRIBUTOR | null | null | null | null | This PR fixes a bug in the `generate_examples` function where `datasets.Value` features with a `float` dtype were incorrectly generated using `np.random.randint`. This resulted in integer values being cast to float, which is not representative of true floating-point data.
**Key changes include:**
* Added explicit handling for `float` features using `np.random.rand` to generate continuous values.
* Introduced fail-fast type checks for unsupported dtypes to improve robustness.
* Added validation for sequence features to ensure `seq_shapes` is provided.
### Before Fix
Float features were generated incorrectly as integers cast to float:
```text
- Example 0:
- int_feature: 0
- float_feature: 9.0 <-- Incorrect: An integer disguised as a float
- string_feature: The small grey turtle was surprisingly fast...
- seq_feature: [0.3048 0.4291 0.4283]
```
### After Fix
Float features are now correctly generated as continuous numbers in the range [0, 1):
```text
+ Example 0:
+ int_feature: 0
+ float_feature: 0.0183 <-- Correct: A true random float
+ string_feature: The small grey turtle was surprisingly fast...
+ seq_feature: [0.9237 0.7972 0.8526]
```
#### Note: This PR is a follow-up/fix of the previously closed PR #7769 for clarity and context.
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} | [] | closed | false | null | [] | null | 0 | 2025-09-13T17:19:36 | 2025-09-13T17:30:15 | 2025-09-13T17:30:15 | CONTRIBUTOR | null | null | null | null | This PR fixes a bug in the `generate_examples` function where `datasets.Value` features with a `float` dtype were incorrectly generated using `np.random.randint`. This resulted in integer values being cast to float, which is not representative of true floating-point data.
**Key changes include:**
1. Added explicit handling for float features using `np.random.rand` to generate continuous values.
2. Introduced fail-fast type checks for unsupported dtypes to improve robustness.
3. Added validation for sequence features to ensure `seq_shapes` is provided.
### Before Fix
Float features were generated incorrectly as integers cast to float:
```text
Example 0:
int_feature: 0
float_feature: 9.0 <-- Incorrect: An integer disguised as a float
string_feature: The small grey turtle was surprisingly fast...
seq_feature: [0.3048 0.4291 0.4283]
```
### After Fix
Float features are now correctly generated as continuous numbers in the range [0, 1):
```text
Example 0:
int_feature: 0
float_feature: 0.0183 <-- Correct: A true random float
string_feature: The small grey turtle was surprisingly fast...
seq_feature: [0.9237 0.7972 0.8526] | {
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