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https://api.github.com/repos/huggingface/datasets/issues/7681
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7,681
Probabilistic High Memory Usage and Freeze on Python 3.10
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### Describe the bug A probabilistic issue encountered when processing datasets containing PIL.Image columns using the huggingface/datasets library on Python 3.10. The process occasionally experiences a sudden and significant memory spike, reaching 100% utilization, leading to a complete freeze. During this freeze, the process becomes unresponsive, cannot be forcefully terminated, and does not throw any exceptions. I have attempted to mitigate this issue by setting `datasets.config.IN_MEMORY_MAX_SIZE`, but it had no effect. In fact, based on the document of `load_dataset`, I suspect that setting `IN_MEMORY_MAX_SIZE` might even have a counterproductive effect. This bug is not consistently reproducible, but its occurrence rate significantly decreases or disappears entirely when upgrading Python to version 3.11 or higher. Therefore, this issue also serves to share a potential solution for others who might encounter similar problems. ### Steps to reproduce the bug Due to the probabilistic nature of this bug, consistent reproduction cannot be guaranteed for every run. However, in my environment, processing large datasets like timm/imagenet-1k-wds(whether reading, casting, or mapping operations) almost certainly triggers the issue at some point. The probability of the issue occurring drastically increases when num_proc is set to a value greater than 1 during operations. When the issue occurs, my system logs repeatedly show the following warnings: ``` WARN: very high memory utilization: 57.74GiB / 57.74GiB (100 %) WARN: container is unhealthy: triggered memory limits (OOM) WARN: container is unhealthy: triggered memory limits (OOM) WARN: container is unhealthy: triggered memory limits (OOM) ``` ### Expected behavior The dataset should be read and processed normally without memory exhaustion or freezing. If an unrecoverable error occurs, an appropriate exception should be raised. I have found that upgrading Python to version 3.11 or above completely resolves this issue. On Python 3.11, when memory usage approaches 100%, it suddenly drops before slowly increasing again. I suspect this behavior is due to an expected memory management action, possibly involving writing to disk cache, which prevents the complete freeze observed in Python 3.10. ### Environment info - `datasets` version: 4.0.0 - Platform: Linux-5.15.0-71-generic-x86_64-with-glibc2.35 - Python version: 3.10.12 - `huggingface_hub` version: 0.33.4 - PyArrow version: 20.0.0 - Pandas version: 2.3.1 - `fsspec` version: 2025.3.0
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7,680
Question about iterable dataset and streaming
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2025-07-12T04:48:30
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In the doc, I found the following example: https://github.com/huggingface/datasets/blob/611f5a592359ebac6f858f515c776aa7d99838b2/docs/source/stream.mdx?plain=1#L65-L78 I am confused, 1. If we have already loaded the dataset, why doing `to_iterable_dataset`? Does it go through the dataset faster than map-style dataset? 2. `load_dataset(streaming=True)` is useful for huge dataset, but the speed is slow. How to make it comparable to `to_iterable_dataset` without loading the whole dataset into RAM?
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3,220,787,371
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7,679
metric glue breaks with 4.0.0
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2025-07-10T21:39:50
2025-07-11T17:42:01
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CONTRIBUTOR
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### Describe the bug worked fine with 3.6.0, and with 4.0.0 `eval_metric = metric.compute()` in HF Accelerate breaks. The code that fails is: https://huggingface.co/spaces/evaluate-metric/glue/blob/v0.4.0/glue.py#L84 ``` def simple_accuracy(preds, labels): print(preds, labels) print(f"{preds==labels}") return float((preds == labels).mean()) ``` data: ``` Column([1, 0, 0, 1, 1]) Column([1, 0, 0, 1, 0]) False ``` ``` [rank0]: return float((preds == labels).mean()) [rank0]: ^^^^^^^^^^^^^^^^^^^^^^ [rank0]: AttributeError: 'bool' object has no attribute 'mean' ``` Some behavior has changed in this new major release of `datasets` and requires updating HF accelerate and perhaps the glue metric code, all belong to HF. ### Environment info datasets=4.0.0
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7,678
To support decoding audio data, please install 'torchcodec'.
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2025-07-11T05:05:42
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In the latest version of datasets==4.0.0, i cannot print the audio data on the Colab notebook. But it works on the 3.6.0 version. !pip install -q -U datasets huggingface_hub fsspec from datasets import load_dataset downloaded_dataset = load_dataset("ymoslem/MediaSpeech", "tr", split="train") print(downloaded_dataset["audio"][0]) --------------------------------------------------------------------------- ImportError Traceback (most recent call last) [/tmp/ipython-input-4-90623240.py](https://localhost:8080/#) in <cell line: 0>() ----> 1 downloaded_dataset["audio"][0] 10 frames [/usr/local/lib/python3.11/dist-packages/datasets/features/audio.py](https://localhost:8080/#) in decode_example(self, value, token_per_repo_id) 170 from ._torchcodec import AudioDecoder 171 else: --> 172 raise ImportError("To support decoding audio data, please install 'torchcodec'.") 173 174 if not self.decode: ImportError: To support decoding audio data, please install 'torchcodec'. ### Environment info - `datasets` version: 4.0.0 - Platform: Linux-6.1.123+-x86_64-with-glibc2.35 - Python version: 3.11.13 - `huggingface_hub` version: 0.33.2 - PyArrow version: 18.1.0 - Pandas version: 2.2.2 - `fsspec` version: 2025.3.0
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Toxicity fails with datasets 4.0.0
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### Describe the bug With the latest 4.0.0 release, huggingface toxicity evaluation module fails with error: `ValueError: text input must be of type `str` (single example), `List[str]` (batch or single pretokenized example) or `List[List[str]]` (batch of pretokenized examples).` ### Steps to reproduce the bug Repro: ``` >>> toxicity.compute(predictions=["This is a response"]) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/Users/serena.ruan/miniconda3/envs/mlflow-310/lib/python3.10/site-packages/evaluate/module.py", line 467, in compute output = self._compute(**inputs, **compute_kwargs) File "/Users/serena.ruan/.cache/huggingface/modules/evaluate_modules/metrics/evaluate-measurement--toxicity/2390290fa0bf6d78480143547c6b08f3d4f8805b249df8c7a8e80d0ce8e3778b/toxicity.py", line 135, in _compute scores = toxicity(predictions, self.toxic_classifier, toxic_label) File "/Users/serena.ruan/.cache/huggingface/modules/evaluate_modules/metrics/evaluate-measurement--toxicity/2390290fa0bf6d78480143547c6b08f3d4f8805b249df8c7a8e80d0ce8e3778b/toxicity.py", line 103, in toxicity for pred_toxic in toxic_classifier(preds): File "/Users/serena.ruan/miniconda3/envs/mlflow-310/lib/python3.10/site-packages/transformers/pipelines/text_classification.py", line 159, in __call__ result = super().__call__(*inputs, **kwargs) File "/Users/serena.ruan/miniconda3/envs/mlflow-310/lib/python3.10/site-packages/transformers/pipelines/base.py", line 1431, in __call__ return self.run_single(inputs, preprocess_params, forward_params, postprocess_params) File "/Users/serena.ruan/miniconda3/envs/mlflow-310/lib/python3.10/site-packages/transformers/pipelines/base.py", line 1437, in run_single model_inputs = self.preprocess(inputs, **preprocess_params) File "/Users/serena.ruan/miniconda3/envs/mlflow-310/lib/python3.10/site-packages/transformers/pipelines/text_classification.py", line 183, in preprocess return self.tokenizer(inputs, return_tensors=return_tensors, **tokenizer_kwargs) File "/Users/serena.ruan/miniconda3/envs/mlflow-310/lib/python3.10/site-packages/transformers/tokenization_utils_base.py", line 2867, in __call__ encodings = self._call_one(text=text, text_pair=text_pair, **all_kwargs) File "/Users/serena.ruan/miniconda3/envs/mlflow-310/lib/python3.10/site-packages/transformers/tokenization_utils_base.py", line 2927, in _call_one raise ValueError( ValueError: text input must be of type `str` (single example), `List[str]` (batch or single pretokenized example) or `List[List[str]]` (batch of pretokenized examples). ``` ### Expected behavior This works before 4.0.0 release ### Environment info - `datasets` version: 4.0.0 - Platform: macOS-15.5-arm64-arm-64bit - Python version: 3.10.16 - `huggingface_hub` version: 0.33.0 - PyArrow version: 19.0.1 - Pandas version: 2.2.3 - `fsspec` version: 2024.12.0
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7,676
Many things broken since the new 4.0.0 release
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### Describe the bug The new changes in 4.0.0 are breaking many datasets, including those from lm-evaluation-harness. I am trying to revert back to older versions, like 3.6.0 to make the eval work but I keep getting: ``` Python File /venv/main/lib/python3.12/site-packages/datasets/features/features.py:1474, in generate_from_dict(obj) 1471 class_type = _FEATURE_TYPES.get(_type, None) or globals().get(_type, None) 1473 if class_type is None: -> 1474 raise ValueError(f"Feature type '{_type}' not found. Available feature types: {list(_FEATURE_TYPES.keys())}") 1476 if class_type == LargeList: 1477 feature = obj.pop("feature") ValueError: Feature type 'List' not found. Available feature types: ['Value', 'ClassLabel', 'Translation', 'TranslationVariableLanguages', 'LargeList', 'Sequence', 'Array2D', 'Array3D', 'Array4D', 'Array5D', 'Audio', 'Image', 'Video', 'Pdf'] ``` ### Steps to reproduce the bug ``` Python import lm_eval model_eval = lm_eval.models.huggingface.HFLM(pretrained=model, tokenizer=tokenizer) lm_eval.evaluator.simple_evaluate(model_eval, tasks=["winogrande"], num_fewshot=5, batch_size=1) ``` ### Expected behavior Older `datasets` versions should work just fine as before ### Environment info - `datasets` version: 3.6.0 - Platform: Linux-6.8.0-60-generic-x86_64-with-glibc2.39 - Python version: 3.12.11 - `huggingface_hub` version: 0.33.1 - PyArrow version: 20.0.0 - Pandas version: 2.3.1 - `fsspec` version: 2025.3.0
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7,675
common_voice_11_0.py failure in dataset library
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### Describe the bug I tried to download dataset but have got this error: from datasets import load_dataset load_dataset("mozilla-foundation/common_voice_11_0", "en", split="test", streaming=True) --------------------------------------------------------------------------- RuntimeError Traceback (most recent call last) Cell In[8], line 4 1 from datasets import load_dataset ----> 4 load_dataset("mozilla-foundation/common_voice_11_0", "en", split="test", streaming=True) File c:\Users\ege_g\AppData\Local\Programs\Python\Python312\Lib\site-packages\datasets\load.py:1392, in load_dataset(path, name, data_dir, data_files, split, cache_dir, features, download_config, download_mode, verification_mode, keep_in_memory, save_infos, revision, token, streaming, num_proc, storage_options, **config_kwargs) 1387 verification_mode = VerificationMode( 1388 (verification_mode or VerificationMode.BASIC_CHECKS) if not save_infos else VerificationMode.ALL_CHECKS 1389 ) 1391 # Create a dataset builder -> 1392 builder_instance = load_dataset_builder( 1393 path=path, 1394 name=name, 1395 data_dir=data_dir, 1396 data_files=data_files, 1397 cache_dir=cache_dir, 1398 features=features, 1399 download_config=download_config, 1400 download_mode=download_mode, 1401 revision=revision, 1402 token=token, 1403 storage_options=storage_options, 1404 **config_kwargs, 1405 ) 1407 # Return iterable dataset in case of streaming 1408 if streaming: File c:\Users\ege_g\AppData\Local\Programs\Python\Python312\Lib\site-packages\datasets\load.py:1132, in load_dataset_builder(path, name, data_dir, data_files, cache_dir, features, download_config, download_mode, revision, token, storage_options, **config_kwargs) 1130 if features is not None: 1131 features = _fix_for_backward_compatible_features(features) -> 1132 dataset_module = dataset_module_factory( 1133 path, 1134 revision=revision, 1135 download_config=download_config, 1136 download_mode=download_mode, 1137 data_dir=data_dir, 1138 data_files=data_files, 1139 cache_dir=cache_dir, 1140 ) 1141 # Get dataset builder class 1142 builder_kwargs = dataset_module.builder_kwargs File c:\Users\ege_g\AppData\Local\Programs\Python\Python312\Lib\site-packages\datasets\load.py:1031, in dataset_module_factory(path, revision, download_config, download_mode, data_dir, data_files, cache_dir, **download_kwargs) 1026 if isinstance(e1, FileNotFoundError): 1027 raise FileNotFoundError( 1028 f"Couldn't find any data file at {relative_to_absolute_path(path)}. " 1029 f"Couldn't find '{path}' on the Hugging Face Hub either: {type(e1).__name__}: {e1}" 1030 ) from None -> 1031 raise e1 from None 1032 else: 1033 raise FileNotFoundError(f"Couldn't find any data file at {relative_to_absolute_path(path)}.") File c:\Users\ege_g\AppData\Local\Programs\Python\Python312\Lib\site-packages\datasets\load.py:989, in dataset_module_factory(path, revision, download_config, download_mode, data_dir, data_files, cache_dir, **download_kwargs) 981 try: 982 api.hf_hub_download( 983 repo_id=path, 984 filename=filename, (...) 987 proxies=download_config.proxies, 988 ) --> 989 raise RuntimeError(f"Dataset scripts are no longer supported, but found {filename}") 990 except EntryNotFoundError: 991 # Use the infos from the parquet export except in some cases: 992 if data_dir or data_files or (revision and revision != "main"): RuntimeError: Dataset scripts are no longer supported, but found common_voice_11_0.py ### Steps to reproduce the bug from datasets import load_dataset load_dataset("mozilla-foundation/common_voice_11_0", "en", split="test", streaming=True) ### Expected behavior its supposed to download this dataset. ### Environment info Python 3.12 , Windows 11
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Fix double sequence
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```python >>> Features({"a": Sequence(Sequence({"c": Value("int64")}))}) {'a': List({'c': List(Value('int64'))})} ``` instead of `{'a': {'c': List(List(Value('int64')))}}`
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Mapping function not working if the first example is returned as None
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### Describe the bug https://github.com/huggingface/datasets/blob/8a19de052e3d79f79cea26821454bbcf0e9dcd68/src/datasets/arrow_dataset.py#L3652C29-L3652C37 Here we can see the writer is initialized on `i==0`. However, there can be cases where in the user mapping function, the first example is filtered out (length constraints, etc). In this case, the writer would be a `None` type and the code will report `NoneType has no write function`. A simple fix is available, simply change line 3652 from `if i == 0:` to `if writer is None:` ### Steps to reproduce the bug Prepare a dataset have this function ``` import datasets def make_map_fn(split, max_prompt_tokens=3): def process_fn(example, idx): question = example['question'] reasoning_steps = example['reasoning_steps'] label = example['label'] answer_format = "" for i in range(len(reasoning_steps)): system_message = "Dummy" all_steps_formatted = [] content = f"""Dummy""" prompt = [ {"role": "system", "content": system_message}, {"role": "user", "content": content}, ] tokenized = tokenizer.apply_chat_template(prompt, return_tensors="pt", truncation=False) if tokenized.shape[1] > max_prompt_tokens: return None # skip overly long examples data = { "dummy": "dummy" } return data return process_fn ... # load your dataset ... train = train.map(function=make_map_fn('train'), with_indices=True) ``` ### Expected behavior The dataset mapping shall behave even when the first example is filtered out. ### Environment info I am using `datasets==3.6.0` but I have observed this issue in the github repo too: https://github.com/huggingface/datasets/blob/8a19de052e3d79f79cea26821454bbcf0e9dcd68/src/datasets/arrow_dataset.py#L3652C29-L3652C37
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Fix audio bytes
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How can I add my custom data to huggingface datasets
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I want to add my custom dataset in huggingface dataset. Please guide me how to achieve that.
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Broken EXIF crash the whole program
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### Describe the bug When parsing this image in the ImageNet1K dataset, the `datasets` crashs whole training process just because unable to parse an invalid EXIF tag. ![Image](https://github.com/user-attachments/assets/3c840203-ac8c-41a0-9cf7-45f64488037d) ### Steps to reproduce the bug Use the `datasets.Image.decode_example` method to decode the aforementioned image could reproduce the bug. The decoding function will throw an unhandled exception at the `image.getexif()` method call due to invalid utf-8 stream in EXIF tags. ``` File lib/python3.12/site-packages/datasets/features/image.py:188, in Image.decode_example(self, value, token_per_repo_id) 186 image = PIL.Image.open(BytesIO(bytes_)) 187 image.load() # to avoid "Too many open files" errors --> 188 if image.getexif().get(PIL.Image.ExifTags.Base.Orientation) is not None: 189 image = PIL.ImageOps.exif_transpose(image) 190 if self.mode and self.mode != image.mode: File lib/python3.12/site-packages/PIL/Image.py:1542, in Image.getexif(self) 1540 xmp_tags = self.info.get("XML:com.adobe.xmp") 1541 if not xmp_tags and (xmp_tags := self.info.get("xmp")): -> 1542 xmp_tags = xmp_tags.decode("utf-8") 1543 if xmp_tags: 1544 match = re.search(r'tiff:Orientation(="|>)([0-9])', xmp_tags) UnicodeDecodeError: 'utf-8' codec can't decode byte 0xa8 in position 4312: invalid start byte ``` ### Expected behavior The invalid EXIF tag should simply be ignored or issue a warning message, instead of crash the whole program at once. ### Environment info - `datasets` version: 3.6.0 - Platform: Linux-6.5.0-18-generic-x86_64-with-glibc2.35 - Python version: 3.12.11 - `huggingface_hub` version: 0.33.0 - PyArrow version: 20.0.0 - Pandas version: 2.3.0 - `fsspec` version: 2025.3.0
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Fix infer list of images
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Function load_dataset() misinterprets string field content as part of dataset schema when dealing with `.jsonl` files
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### Describe the bug When loading a `.jsonl` file using `load_dataset("json", data_files="data.jsonl", split="train")`, the function misinterprets the content of a string field as if it were part of the dataset schema. In my case there is a field `body:` with a string value ``` "### Describe the bug (...) ,action: string, datetime: timestamp[s], author: string, (...) Pandas version: 1.3.4" ``` As a result, I got an exception ``` "TypeError: Couldn't cast array of type timestamp[s] to null". ``` Full stack-trace in the attached file below. I also attach a minimized dataset (data.json, a single entry) that reproduces the error. **Observations**(on the minimal example): - if I remove _all fields before_ `body`, a different error appears, - if I remove _all fields after_ `body`, yet another error appears, - if `body` is _the only field_, the error disappears. So this might be one complex bug or several edge cases interacting. I haven’t dug deeper. Also changing the file extension to `.json` or `.txt` avoids the problem. This suggests **a possible workaround** for the general case: convert `.jsonl` to `.json`. Though I haven’t verified correctness of that workaround yet. Anyway my understanding is that `load_dataset` with first argument set to "json" should properly handle `.jsonl` files. Correct me if I'm wrong. [stack_trace.txt](https://github.com/user-attachments/files/21004153/stack_trace.txt) [data.json](https://github.com/user-attachments/files/21004164/data.json) P.S. I discovered this while going through the HuggingFace tutorial. Specifically [this part](https://huggingface.co/learn/llm-course/chapter5/5?fw=pt).I will try to inform the tutorial team about this issue, as it can be a showstopper for young 🤗 adepts. ### Steps to reproduce the bug 1. Download attached [data.json](https://github.com/user-attachments/files/21004164/data.json) file. 2. Run the following code which should work correctly: ``` from datasets import load_dataset load_dataset("json", data_files="data.json", split="train") ``` 3. Change extension of the `data` file to `.jsonl` and run: ``` from datasets import load_dataset load_dataset("json", data_files="data.jsonl", split="train") ``` This will trigger an error like the one in the attached [stack_trace.txt](https://github.com/user-attachments/files/21004153/stack_trace.txt). One can also try removing fields before the `body` field and after it. These actions give different errors. ### Expected behavior Parsing data in `.jsonl` format should yield the same result as parsing the same data in `.json` format. In any case, the content of a string field should never be interpreted as part of the dataset schema. ### Environment info datasets version: _3.6.0_ pyarrow version: _20.0.0_ Python version: _3.11.9_ platform version: _macOS-15.5-arm64-arm-64bit_
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Function load_dataset() misinterprets string field content as part of dataset schema when dealing with `.jsonl` files
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### Describe the bug When loading a `.jsonl` file using `load_dataset("json", data_files="data.jsonl", split="train")`, the function misinterprets the content of a string field as if it were part of the dataset schema. In my case there is a field `body:` with a string value ``` "### Describe the bug (...) ,action: string, datetime: timestamp[s], author: string, (...) Pandas version: 1.3.4" ``` As a result, I got an exception ``` "TypeError: Couldn't cast array of type timestamp[s] to null". ``` Full stack-trace in the attached file below. I also attach a minimized dataset (data.json, a single entry) that reproduces the error. **Observations**(on the minimal example): - if I remove _all fields before_ `body`, a different error appears, - if I remove _all fields after_ `body`, yet another error appears, - if `body` is _the only field_, the error disappears. So this might be one complex bug or several edge cases interacting. I haven’t dug deeper. Also changing the file extension to `.json` or `.txt` avoids the problem. This suggests **a possible workaround** for the general case: convert `.jsonl` to `.json`. Though I haven’t verified correctness of that workaround yet. Anyway my understanding is that `load_dataset` with first argument set to "json" should properly handle `.jsonl` files. Correct me if I'm wrong. [stack_trace.txt](https://github.com/user-attachments/files/21004153/stack_trace.txt) [data.json](https://github.com/user-attachments/files/21004164/data.json) P.S. I discovered this while going through the HuggingFace tutorial. Specifically [this part](https://huggingface.co/learn/llm-course/chapter5/5?fw=pt). I will try to inform the tutorial team about this issue, as it can be a showstopper for young 🤗 adepts. ### Steps to reproduce the bug 1. Download attached [data.json](https://github.com/user-attachments/files/21004164/data.json) file. 2. Run the following code which should work correctly: ``` from datasets import load_dataset load_dataset("json", data_files="data.json", split="train") ``` 3. Change extension of the `data` file to `.jsonl` and run: ``` from datasets import load_dataset load_dataset("json", data_files="data.jsonl", split="train") ``` This will trigger an error like the one in the attached [stack_trace.txt](https://github.com/user-attachments/files/21004153/stack_trace.txt). One can also try removing fields before the `body` field and after it. These actions give different errors. ### Expected behavior Parsing data in `.jsonl` format should yield the same result as parsing the same data in `.json` format. In any case, the content of a string field should never be interpreted as part of the dataset schema. ### Environment info datasets version: _3.6.0_ pyarrow version: _20.0.0_ Python version: _3.11.9_ platform version: _macOS-15.5-arm64-arm-64bit_
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Applying map after transform with multiprocessing will cause OOM
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### Describe the bug I have a 30TB dataset. When I perform add_column and cast_column operations on it and then execute a multiprocessing map, it results in an OOM (Out of Memory) error. However, if I skip the add_column and cast_column steps and directly run the map, there is no OOM. After debugging step by step, I found that the OOM is caused at this point, and I suspect it’s because the add_column and cast_column operations are not cached, which causes the entire dataset to be loaded in each subprocess, leading to the OOM. The critical line of code is: https://github.com/huggingface/datasets/blob/e71b0b19d79c7531f9b9bea7c09916b5f6157f42/src/datasets/utils/py_utils.py#L607 Note num_process=1 would not cause OOM. I'm confused. ### Steps to reproduce the bug For reproduce, you can load dataset and set cache_dir (for caching): amphion/Emilia-Dataset which is a veru large datasets that RAM can not fits. And apply the map with multiprocessing after a transform operation (e.g. add_column, cast_column). As long as num_process>1, it must cause OOM. ### Expected behavior It should not cause OOM. ### Environment info - `datasets` version: 3.6.0 - Platform: Linux-5.10.134-16.101.al8.x86_64-x86_64-with-glibc2.35 - Python version: 3.10.12 - `huggingface_hub` version: 0.33.1 - PyArrow version: 20.0.0 - Pandas version: 2.3.0 - `fsspec` version: 2024.6.1
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fix del tqdm lock error
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fixes https://github.com/huggingface/datasets/issues/7660
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AttributeError: type object 'tqdm' has no attribute '_lock'
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### Describe the bug `AttributeError: type object 'tqdm' has no attribute '_lock'` It occurs when I'm trying to load datasets in thread pool. Issue https://github.com/huggingface/datasets/issues/6066 and PR https://github.com/huggingface/datasets/pull/6067 https://github.com/huggingface/datasets/pull/6068 tried to fix this. ### Steps to reproduce the bug Will have to try several times to reproduce the error because it is concerned with threads. 1. save some datasets for test ```pythonfrom datasets import Dataset, DatasetDict import os os.makedirs("test_dataset_shards", exist_ok=True) for i in range(10): data = Dataset.from_dict({"text": [f"example {j}" for j in range(1000000)]}) data = DatasetDict({'train': data}) data.save_to_disk(f"test_dataset_shards/shard_{i}") ``` 2. load them in a thread pool ```python from datasets import load_from_disk from tqdm import tqdm from concurrent.futures import ThreadPoolExecutor, as_completed import glob datas = glob.glob('test_dataset_shards/shard_*') with ThreadPoolExecutor(max_workers=10) as pool: futures = [pool.submit(load_from_disk, it) for it in datas] datas = [] for future in tqdm(as_completed(futures), total=len(futures)): datas.append(future.result()) ``` ### Expected behavior no exception raised ### Environment info datasets==2.19.0 python==3.10
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Update the beans dataset link in Preprocess
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2025-07-07T08:38:19
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In the Preprocess tutorial, the to "the beans dataset" is incorrect. Fixed.
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2025-06-30T09:31:12
2025-07-01T16:26:30
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This PR fixes a bug where calling `IterableDatasetDict.map()` or `IterableDataset.map()` with the default `features=None` argument would overwrite the existing `info.features` attribute with `None`. This, in turn, caused the resulting dataset to lose its schema, breaking downstream usage of attributes like `column_names`. Why Previously, the code would always set `info.features = features`, even if `features` was `None`. When mapping with removal of columns or other transformations, this led to the destruction of the schema and caused failures in code that relied on the dataset schema being present. How We now update `info.features` only if `features` is not `None`. This preserves the original schema unless the user explicitly provides a new one. Reference Fixes #7568
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fixes #7637 This PR introduces subset_name as a user-facing alias for the name (previously `config_name`) argument in load_dataset. It aligns terminology with the Hugging Face Hub UI (which shows “Subset”), reducing confusion for new users. Supports `subset_name` in `load_dataset()` Adds `.subset_name` property to DatasetBuilder Maintains full backward compatibility Raises clear error if name and `subset_name` conflict
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Fixes #7630 ### Problem When calling `.map()` on an `IterableDataset`, resuming from a checkpoint skips a large number of samples. This is because `MappedExamplesIterable` did not implement `state_dict()` or `load_state_dict()`, so checkpointing was not properly delegated to the underlying iterable. ### What This PR Does This patch adds: ```python def state_dict(self): return self.ex_iterable.state_dict() def load_state_dict(self, state): self.ex_iterable.load_state_dict(state) ``` to MappedExamplesIterable, so the wrapped base iterable's state can be saved and restored as expected. Result Using .map() no longer causes sample skipping after checkpoint resume. Let me know if a dedicated test case is required — happy to add one!
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Fixes #2494
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2025-06-28T09:20:21
2025-06-28T09:20:21
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Fixes #7504 This PR resolves a compatibility error when loading datasets via `load_dataset()` using outdated arguments like `use_auth_token`. **What was happening:** Users passing `use_auth_token` in `load_dataset(..., use_auth_token=...)` encountered a `ValueError`: BuilderConfig ParquetConfig(...) doesn't have a 'use_auth_token' key. **Why:** `use_auth_token` has been deprecated and removed from config definitions (replaced by `token`), but the `load_dataset()` function still forwarded it via `**config_kwargs` to BuilderConfigs, leading to unrecognized key errors. **Fix:** We now intercept and strip `use_auth_token` from `config_kwargs` inside `load_dataset`, replacing it with a warning: ```python if "use_auth_token" in config_kwargs: logger.warning("The 'use_auth_token' argument is deprecated. Please use 'token' instead.") config_kwargs.pop("use_auth_token") ``` This ensures legacy compatibility while guiding users to switch to the token argument. Let me know if you'd prefer a deprecation error instead of a warning. Thanks!
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### Related Issue Fixes #7503 Partially addresses #5044 by allowing `load_dataset()` to auto-detect and gracefully delegate to `load_from_disk()` for locally saved datasets. --- ### What does this PR do? This PR introduces a minimal fallback mechanism in `load_dataset()` that detects when the provided `path` points to a dataset saved using `save_to_disk()`, and automatically redirects to `load_from_disk()`. #### 🐛 Before (unexpected metadata-only rows): ```python ds = load_dataset("/path/to/saved_dataset") # → returns rows with only internal metadata (_data_files, _fingerprint, etc.) ```` #### ✅ After (graceful fallback): ```python ds = load_dataset("/path/to/saved_dataset") # → logs a warning and internally switches to load_from_disk() ``` --- ### Why is this useful? * Prevents confusion when reloading local datasets saved via `save_to_disk()`. * Enables smoother compatibility with frameworks (e.g., TRL, `lighteval`) that rely on `load_dataset()` calls. * Fully backward-compatible — hub-based loading, custom builders, and streaming remain untouched.
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Fixes #7594 This PR adds support for filtering specific columns when loading datasets from .json or .jsonl files — similar to how the columns=... argument works for Parquet. As suggested, support for the `columns=...` argument (previously available for Parquet) has now been extended to **JSON and JSONL** loading via `load_dataset(...)`. You can now load only specific keys/columns and skip the rest — which should help in cases where some fields are unclean, inconsistent, or just unnecessary. ### Example: ```python from datasets import load_dataset dataset = load_dataset("json", data_files="your_data.jsonl", columns=["id", "title"]) print(dataset["train"].column_names) # Output: ['id', 'title'] ``` ### Summary of changes: * Added `columns: Optional[List[str]]` to `JsonConfig` * Updated `_generate_tables()` to filter selected columns * Forwarded `columns` argument from `load_dataset()` to the config * Added test for validation(should be fine!) Let me know if you'd like the same to be added for CSV or others as a follow-up — happy to help.
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fix: Extended metadata file names for folder_based_builder
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Fixes #7650. The metadata files generated by the `DatasetDict.save_to_file` function are not included in the folder_based_builder's metadata list, causing issues when only 1 actual data file is present, as described in issue #7650. This PR adds these filenames to the builder, allowing correct loading.
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`load_dataset` defaults to json file format for datasets with 1 shard
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### Describe the bug I currently have multiple datasets (train+validation) saved as 50MB shards. For one dataset the validation pair is small enough to fit into a single shard and this apparently causes problems when loading the dataset. I created the datasets using a DatasetDict, saved them as 50MB arrow files for streaming and then load each dataset. I have no problem loading any of the other datasets with more than 1 arrow file/shard. The error indicates the training set got loaded in arrow format (correct) and the validation set in json (incorrect). This seems to be because some of the metadata files are considered as dataset files. ``` Error loading /nfs/dataset_pt-uk: Couldn't infer the same data file format for all splits. Got {NamedSplit('train'): ('arrow', {}), NamedSplit('validation'): ('json', {})} ``` ![Image](https://github.com/user-attachments/assets/f6e7596a-dd53-46a9-9a23-4e9cac2ac049) Concretely, there is a mismatch between the metadata created by the `DatasetDict.save_to_file` and the builder for `datasets.load_dataset`: https://github.com/huggingface/datasets/blob/e71b0b19d79c7531f9b9bea7c09916b5f6157f42/src/datasets/data_files.py#L107 The `folder_based_builder` lists all files and with 1 arrow file the json files (that are actually metadata) are in the majority. https://github.com/huggingface/datasets/blob/e71b0b19d79c7531f9b9bea7c09916b5f6157f42/src/datasets/packaged_modules/folder_based_builder/folder_based_builder.py#L58 ### Steps to reproduce the bug Create a dataset with metadata and 1 arrow file in validation and multiple arrow files in the training set, following the above description. In my case, I saved the files via: ```python dataset = DatasetDict({ 'train': train_dataset, 'validation': val_dataset }) dataset.save_to_disk(output_path, max_shard_size="50MB") ``` ### Expected behavior The dataset would get loaded. ### Environment info - `datasets` version: 3.6.0 - Platform: Linux-6.14.0-22-generic-x86_64-with-glibc2.41 - Python version: 3.12.7 - `huggingface_hub` version: 0.31.1 - PyArrow version: 18.1.0 - Pandas version: 2.2.3 - `fsspec` version: 2024.6.1
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Enable parallel shard upload in push_to_hub() using num_proc
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2025-06-27T05:59:03
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CONTRIBUTOR
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Fixes #7591 ### Add num_proc support to `push_to_hub()` for parallel shard upload This PR adds support for parallel upload of dataset shards via the `num_proc` argument in `Dataset.push_to_hub()`. 📌 While the `num_proc` parameter was already present in the `push_to_hub()` signature and correctly passed to `_push_parquet_shards_to_hub()`, it was not being used to parallelize the upload. 🔧 This PR updates the internal `_push_parquet_shards_to_hub()` function to: - Use `multiprocessing.Pool` and `iflatmap_unordered()` for concurrent shard upload when `num_proc > 1` - Preserve original serial upload behavior if `num_proc` is `None` or ≤ 1 - Keep tqdm progress and commit behavior unchanged Let me know if any test coverage or further changes are needed!
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Fix misleading add_column() usage example in docstring
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Fixes #7611 This PR fixes the usage example in the Dataset.add_column() docstring, which previously implied that add_column() modifies the dataset in-place. Why: The method returns a new dataset with the additional column, and users must assign the result to a variable to preserve the change. This should make the behavior clearer for users. @lhoestq @davanstrien
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loading mozilla-foundation--common_voice_11_0 fails
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### Describe the bug Hello everyone, i am trying to load `mozilla-foundation--common_voice_11_0` and it fails. Reproducer ``` import datasets datasets.load_dataset("mozilla-foundation/common_voice_11_0", "en", split="test", streaming=True, trust_remote_code=True) ``` and it fails with ``` File ~/opt/envs/.../lib/python3.10/site-packages/datasets/utils/file_utils.py:827, in _add_retries_to_file_obj_read_method.<locals>.read_with_retries(*args, **kwargs) 825 for retry in range(1, max_retries + 1): 826 try: --> 827 out = read(*args, **kwargs) 828 break 829 except ( 830 _AiohttpClientError, 831 asyncio.TimeoutError, 832 requests.exceptions.ConnectionError, 833 requests.exceptions.Timeout, 834 ) as err: File /usr/lib/python3.10/codecs.py:322, in BufferedIncrementalDecoder.decode(self, input, final) 319 def decode(self, input, final=False): 320 # decode input (taking the buffer into account) 321 data = self.buffer + input --> 322 (result, consumed) = self._buffer_decode(data, self.errors, final) 323 # keep undecoded input until the next call 324 self.buffer = data[consumed:] UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8b in position 1: invalid start byte ``` When i remove streaming then everything is good but i need `streaming=True` ### Steps to reproduce the bug ``` import datasets datasets.load_dataset("mozilla-foundation/common_voice_11_0", "en", split="test", streaming=True, trust_remote_code=True) ``` ### Expected behavior Expected that it will download dataset ### Environment info datasets==3.6.0 python3.10 on all platforms linux/win/mac
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Introduces automatic subset-level grouping for folder-based dataset builders #7066
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Fixes #7066 This PR introduces automatic **subset-level grouping** for folder-based dataset builders by: 1. Adding a utility function `group_files_by_subset()` that clusters files by root name (ignoring digits and shard suffixes). 2. Integrating this logic into `FolderBasedBuilder._split_generators()` to yield one split per subset. 3. Adding unit tests for the grouping function. 4. Updating the documentation to describe this new behavior under `docs/source/repository_structure.mdx`. --- ### Motivation Datasets with files like: ``` train0.jsonl train1.jsonl animals.jsonl metadata.jsonl ``` will now be **automatically grouped** as: - `"train"` subset → `train0.jsonl`, `train1.jsonl` - `"animals"` subset → `animals.jsonl` - `"metadata"` subset → `metadata.jsonl` This enables structured multi-subset loading even when the dataset doesn't follow traditional `train/validation/test` split conventions. --- ### Files Changed - `src/datasets/data_files.py`: added `group_files_by_subset()` utility - `src/datasets/packaged_modules/folder_based_builder/folder_based_builder.py`: grouped files before yielding splits - `tests/test_data_files.py`: added unit test `test_group_files_by_subset` - `docs/source/repository_structure.mdx`: documented subset grouping for maintainers and users --- ### Benefits - More flexible and robust dataset split logic - Enables logical grouping of user-uploaded files without nested folder structure - Backward-compatible with all existing folder-based configs --- Ready for review ✅
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`ClassLabel` docs: Correct value for unknown labels
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2025-06-25T20:01:35
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This small change fixes the documentation to to be compliant with what happens in `encode_example`. https://github.com/huggingface/datasets/blob/e71b0b19d79c7531f9b9bea7c09916b5f6157f42/src/datasets/features/features.py#L1126-L1129
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7,644
fix sequence ci
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2025-06-25T17:07:55
2025-06-25T17:10:30
2025-06-25T17:08:01
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fix error from https://github.com/huggingface/datasets/pull/7643
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Backward compat sequence instance
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2025-06-25T17:05:09
2025-06-25T17:07:40
2025-06-25T17:05:44
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useful to still get `isinstance(Sequence(Value("int64")), Sequence)`for downstream libs like evaluate
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fix length for ci
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2025-06-25T15:10:38
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update docs and docstrings
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2025-06-25T14:37:32
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following the addition of List in #7634 before: ```python In [3]: ds.features Out[3]: {'json': {'id': Value(dtype='string', id=None), 'metadata:transcript': [{'end': Value(dtype='float64', id=None), 'start': Value(dtype='float64', id=None), 'transcript': Value(dtype='string', id=None), 'words': [{'end': Value(dtype='float64', id=None), 'score': Value(dtype='float64', id=None), 'start': Value(dtype='float64', id=None), 'word': Value(dtype='string', id=None)}]}], 'metadata:vad': [{'end': Value(dtype='float64', id=None), 'start': Value(dtype='float64', id=None)}]}, 'mp4': Value(dtype='binary', id=None), 'npz': {'boxes_and_keypoints:box': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), 'boxes_and_keypoints:is_valid_box': Sequence(feature=Value(dtype='bool', id=None), length=-1, id=None), 'boxes_and_keypoints:keypoints': Sequence(feature=Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), length=-1, id=None), 'movement:EmotionArousalToken': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), 'movement:EmotionValenceToken': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), 'movement:FAUToken': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), 'movement:FAUValue': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), 'movement:alignment_head_rotation': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), 'movement:alignment_translation': Sequence(feature=Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), length=-1, id=None), 'movement:emotion_arousal': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), 'movement:emotion_scores': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), 'movement:emotion_valence': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), 'movement:expression': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), 'movement:frame_latent': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), 'movement:gaze_encodings': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), 'movement:head_encodings': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), 'movement:hypernet_features': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), 'movement:is_valid': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), 'smplh:body_pose': Sequence(feature=Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), length=-1, id=None), 'smplh:global_orient': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), 'smplh:is_valid': Sequence(feature=Value(dtype='bool', id=None), length=-1, id=None), 'smplh:left_hand_pose': Sequence(feature=Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), length=-1, id=None), 'smplh:right_hand_pose': Sequence(feature=Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None), length=-1, id=None), 'smplh:translation': Sequence(feature=Sequence(feature=Value(dtype='float32', id=None), length=-1, id=None), length=-1, id=None)}, 'wav': Audio(sampling_rate=None, mono=True, decode=True, id=None), '__key__': Value(dtype='string', id=None), '__url__': Value(dtype='string', id=None)} ``` after: ```python In [3]: ds.features Out[3]: {'json': {'id': Value('string'), 'metadata:transcript': List({'end': Value('float64'), 'start': Value('float64'), 'transcript': Value('string'), 'words': List({'end': Value('float64'), 'score': Value('float64'), 'start': Value('float64'), 'word': Value('string')})}), 'metadata:vad': List({'end': Value('float64'), 'start': Value('float64')})}, 'mp4': Value('binary'), 'npz': {'boxes_and_keypoints:box': List(List(Value('float32'))), 'boxes_and_keypoints:is_valid_box': List(Value('bool')), 'boxes_and_keypoints:keypoints': List(List(List(Value('float32')))), 'movement:EmotionArousalToken': List(List(Value('float32'))), 'movement:EmotionValenceToken': List(List(Value('float32'))), 'movement:FAUToken': List(List(Value('float32'))), 'movement:FAUValue': List(List(Value('float32'))), 'movement:alignment_head_rotation': List(List(Value('float32'))), 'movement:alignment_translation': List(List(List(Value('float32')))), 'movement:emotion_arousal': List(List(Value('float32'))), 'movement:emotion_scores': List(List(Value('float32'))), 'movement:emotion_valence': List(List(Value('float32'))), 'movement:expression': List(List(Value('float32'))), 'movement:frame_latent': List(List(Value('float32'))), 'movement:gaze_encodings': List(List(Value('float32'))), 'movement:head_encodings': List(List(Value('float32'))), 'movement:hypernet_features': List(List(Value('float32'))), 'movement:is_valid': List(List(Value('float32'))), 'smplh:body_pose': List(List(List(Value('float32')))), 'smplh:global_orient': List(List(Value('float32'))), 'smplh:is_valid': List(Value('bool')), 'smplh:left_hand_pose': List(List(List(Value('float32')))), 'smplh:right_hand_pose': List(List(List(Value('float32')))), 'smplh:translation': List(List(Value('float32')))}, 'wav': Audio(sampling_rate=None, decode=True, stream_index=None), '__key__': Value('string'), '__url__': Value('string')} ```
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fix save_infos
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Add ignore_decode_errors option to Image feature for robust decoding #7612
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2025-06-24T16:47:51
2025-07-04T07:07:30
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CONTRIBUTOR
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This PR implements support for robust image decoding in the `Image` feature, as discussed in issue #7612. ## 🔧 What was added - A new boolean field: `ignore_decode_errors` (default: `False`) - If set to `True`, any exceptions during decoding will be caught, and `None` will be returned instead of raising an error ```python features = Features({ "image": Image(decode=True, ignore_decode_errors=True), }) ```` This enables robust iteration over potentially corrupted datasets — especially useful when streaming datasets like WebDataset or image-heavy public sets where sample corruption is common. ## 🧪 Behavior * If `ignore_decode_errors=False` (default), decoding behaves exactly as before * If `True`, decoding errors are caught, and a warning is emitted: ``` [Image.decode_example] Skipped corrupted image: ... ``` ## 🧵 Linked issue Closes #7612 Let me know if you'd like a follow-up test PR. Happy to write one!
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Introduce subset_name as an alias of config_name
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2025-06-24T12:49:01
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### Feature request Add support for `subset_name` as an alias for `config_name` in the datasets library and related tools (such as loading scripts, documentation, and metadata). ### Motivation The Hugging Face Hub dataset viewer displays a column named **"Subset"**, which refers to what is currently technically called config_name in the datasets library. This inconsistency has caused confusion for many users, especially those unfamiliar with the internal terminology. I have repeatedly received questions from users trying to understand what "config" means, and why it doesn’t match what they see as "subset" on the Hub. Renaming everything to `subset_name` might be too disruptive, but introducing subset_name as a clear alias for config_name could significantly improve user experience without breaking backward compatibility. This change would: - Align terminology across the Hub UI and datasets codebase - Reduce user confusion, especially for newcomers - Make documentation and examples more intuitive
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"open" in globals()["__builtins__"], an error occurs: "TypeError: argument of type 'module' is not iterable"
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When I run the following code, an error occurs: "TypeError: argument of type 'module' is not iterable" ```python print("open" in globals()["__builtins__"]) ``` Traceback (most recent call last): File "./main.py", line 2, in <module> print("open" in globals()["__builtins__"]) ^^^^^^^^^^^^^^^^^^^^^^ TypeError: argument of type 'module' is not iterable But this code runs fine in datasets, I don't understand why [src/datasets/utils/patching.py#L96](https://github.com/huggingface/datasets/blob/3.6.0/src/datasets/utils/patching.py#L96)
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Fix: Preserve float columns in JSON loader when values are integer-like (e.g. 0.0, 1.0)
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2025-06-24T06:16:48
2025-06-24T06:16:48
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CONTRIBUTOR
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This PR fixes a bug in the JSON loader where columns containing float values like `[0.0, 1.0, 2.0]` were being implicitly coerced to `int`, due to pandas or Arrow type inference. This caused issues downstream in statistics computation (e.g., dataset-viewer) where such columns were incorrectly labeled as `"int"` instead of `"float"`. ### 🔍 What was happening: When the JSON loader falls back to `pandas_read_json()` (after `pa.read_json()` fails), pandas/Arrow can coerce float values to integers if all values are integer-like (e.g., `0.0 == 0`). ### ✅ What this PR does: - Adds a check in the fallback path of `_generate_tables()` - Ensures that columns made entirely of floats are preserved as `"float64"` even if they are integer-like (e.g. `0.0`, `1.0`) - This prevents loss of float semantics when creating the Arrow table ### 🧪 Reproducible Example: ```json [{"col": 0.0}, {"col": 1.0}, {"col": 2.0}] ```` Previously loaded as: * `int` Now correctly loaded as: * `float` Fixes #6937
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