mengta666/huggingface_github huggingface dataset:
Issue: Document better that loading a dataset passing its name does not use the local script

As reported by @TrentBrick here https://github.com/huggingface/datasets/issues/4725#issuecomment-1191858596, it could be more clear that loading a dataset by passing its name does not use the (modified) local script of it.

What he did:
- he installed `datasets` from source
- he modified locally `datasets/the_pile/the_pile.py` loading script
- he tried to load it but using `load_dataset("the_pile")` instead of `load_dataset("datasets/the_pile")`
  - as explained here https://github.com/huggingface/datasets/issues/4725#issuecomment-1191040245:
    - the former does not use the local script, but instead it downloads a copy of `the_pile.py` from our GitHub, caches it locally (inside `~/.cache/huggingface/modules`) and uses that.

He suggests adding a more clear explanation about this. He suggests adding it maybe in [Installation > source](https://huggingface.co/docs/datasets/installation))

CC: @stevhliu 

Comments:
Thanks for the feedback!

I think since this issue is closely related to loading, I can add a clearer explanation under [Load > local loading script](https://huggingface.co/docs/datasets/main/en/loading#local-loading-script).

That makes sense but I think having a line about it under https://huggingface.co/docs/datasets/installation#source the "source" header here would be useful. My mental model of `pip install -e .` does not include the fact that the source files aren't actually being used. 

Thanks for sharing your perspective. I think the `load_dataset` function is the only one that pulls from GitHub, and since this use-case is very specific, I don't think we need to include such a broad clarification in the Installation section.

Feel free to check out the linked PR and let me know if it needs any additional explanation 😊
Issue: Loading imagenet-1k validation split takes much more RAM than expected

## Describe the bug

Loading into memory the validation split of imagenet-1k takes much more RAM than expected. Assuming ImageNet-1k is 150 GB, split is 50000 validation images and 1,281,167 train images, I would expect only about 6 GB loaded in RAM.


## Steps to reproduce the bug
```python
from datasets import  load_dataset

dataset = load_dataset("imagenet-1k", split="validation")

print(dataset)

"""prints
Dataset({
    features: ['image', 'label'],
    num_rows: 50000
})
"""

pipe_inputs = dataset["image"]
# and wait :-)
```

## Expected results
Use only < 10 GB RAM when loading the images.

## Actual results
![image](https://user-images.githubusercontent.com/9808326/180249183-62f75ca4-d127-402a-9330-f12825a22b0a.png)

```
Using custom data configuration default
Reusing dataset imagenet-1k (/home/fxmarty/.cache/huggingface/datasets/imagenet-1k/default/1.0.0/a1e9bfc56c3a7350165007d1176b15e9128fcaf9ab972147840529aed3ae52bc)
Killed
```

## Environment info
- `datasets` version: 2.3.3.dev0
- Platform: Linux-5.15.0-41-generic-x86_64-with-glibc2.35
- Python version: 3.9.12
- PyArrow version: 7.0.0
- Pandas version: 1.3.5
- datasets commit: 4e4222f1b6362c2788aec0dd2cd8cede6dd17b80


Comments:
My bad, `482 * 418 * 50000 * 3 / 1000000 = 30221 MB` ( https://stackoverflow.com/a/42979315 ).

Meanwhile `256 * 256 * 50000 * 3 / 1000000 = 9830 MB`. We are loading the non-cropped images and that is why we take so much RAM.
Issue: load_dataset gives "403" error when using Financial Phrasebank

I tried both codes below to download the financial phrasebank dataset (https://huggingface.co/datasets/financial_phrasebank) with the sentences_allagree subset. However, the code gives a 403 error when executed from multiple machines locally or on the cloud.

```
from datasets import load_dataset, DownloadMode
load_dataset(path='financial_phrasebank',name='sentences_allagree',download_mode=DownloadMode.FORCE_REDOWNLOAD)
```

```
from datasets import load_dataset, DownloadMode
load_dataset(path='financial_phrasebank',name='sentences_allagree')
```

**Error**
ConnectionError: Couldn't reach https://www.researchgate.net/profile/Pekka_Malo/publication/251231364_FinancialPhraseBank-v10/data/0c96051eee4fb1d56e000000/FinancialPhraseBank-v10.zip (error 403)


Comments:
Hi @rohitvincent, thanks for reporting.

Unfortunately I'm not able to reproduce your issue:
```python
In [2]: from datasets import load_dataset, DownloadMode
   ...: load_dataset(path='financial_phrasebank',name='sentences_allagree', download_mode="force_redownload")
Downloading builder script: 6.04kB [00:00, 2.87MB/s]                                                                                                                                                       
Downloading metadata: 13.7kB [00:00, 7.24MB/s]                                                                                                                                                             
Downloading and preparing dataset financial_phrasebank/sentences_allagree (download: 665.91 KiB, generated: 296.26 KiB, post-processed: Unknown size, total: 962.17 KiB) to .../.cache/huggingface/datasets/financial_phrasebank/sentences_allagree/1.0.0/550bde12e6c30e2674da973a55f57edde5181d53f5a5a34c1531c53f93b7e141...
Downloading data: 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 682k/682k [00:00<00:00, 7.66MB/s]
Dataset financial_phrasebank downloaded and prepared to .../.cache/huggingface/datasets/financial_phrasebank/sentences_allagree/1.0.0/550bde12e6c30e2674da973a55f57edde5181d53f5a5a34c1531c53f93b7e141. Subsequent calls will reuse this data.
100%|███████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 1/1 [00:00<00:00, 918.80it/s]
Out[2]: 
DatasetDict({
    train: Dataset({
        features: ['sentence', 'label'],
        num_rows: 2264
    })
})
```

Are you able to access the link? https://www.researchgate.net/profile/Pekka-Malo/publication/251231364_FinancialPhraseBank-v10/data/0c96051eee4fb1d56e000000/FinancialPhraseBank-v10.zip

Yes was able to download from the link manually. But still, get the same error when I use load_dataset.

Fixed once data files are hosted on the Hub:
- #4598
Issue: Dataset Viewer issue for TheNoob3131/mosquito-data

### Link

https://huggingface.co/datasets/TheNoob3131/mosquito-data/viewer/TheNoob3131--mosquito-data/test

### Description

Dataset preview not showing with large files. Says 'split cache is empty' even though there are train and test splits.

### Owner

_No response_

Comments:
The preview is working OK:

![Screenshot from 2022-07-21 09-46-09](https://user-images.githubusercontent.com/8515462/180158929-bd8faad4-6392-4fc1-8d9c-df38aa9f8438.png)
Issue: the_pile datasets URL broken. 

https://github.com/huggingface/datasets/pull/3627 changed the Eleuther AI Pile dataset URL from https://the-eye.eu/ to https://mystic.the-eye.eu/ but the latter is now broken and the former works again. 

Note that when I git clone the repo and use `pip install -e .` and then edit the URL back the codebase doesn't seem to use this edit so the mystic URL is also cached somewhere else that I can't find? 

Comments:
Thanks for reporting, @TrentBrick. We are addressing the change with their data host server.

On the meantime, if you would like to work with your fixed local copy of the_pile script, you should use:
```python
load_dataset("path/to/your/local/the_pile/the_pile.py",...
```
instead of just `load_dataset("the_pile",...`.

The latter downloads a copy of `the_pile.py` from our GitHub, caches it locally (inside `~/.cache/huggingface/modules`) and uses that.

@TrentBrick, I have checked the URLs and both hosts work, the original (https://the-eye.eu/) and the mirror (https://mystic.the-eye.eu/). See e.g.:
- https://mystic.the-eye.eu/public/AI/pile/
- https://mystic.the-eye.eu/public/AI/pile_preliminary_components/

Please, let me know if you still find any issue loading this dataset by using current server URLs.

Great this is working now. Re the download from GitHub... I'm sure thought went into doing this but could it be made more clear maybe here? https://huggingface.co/docs/datasets/installation for example under installing from source? I spent over an hour questioning my sanity as I kept trying to edit this file, uninstall and reinstall the repo, git reset to previous versions of the file etc.

Thanks for the quick reply and help too


Thanks @TrentBrick for the suggestion about improving our docs: we should definitely do this if you find they are not clear enough.

Currently, our docs explain how to load a dataset from a local loading script here: [Load > Local loading script](https://huggingface.co/docs/datasets/loading#local-loading-script)

I've opened an issue here:
- #4732

Feel free to comment on it any additional explanation/suggestion/requirement related to this problem.
Issue: Issue loading TheNoob3131/mosquito-data dataset

![image](https://user-images.githubusercontent.com/53668030/179815591-d75fa7d3-3122-485f-a852-b06a68909066.png)

So my dataset is public in the Huggingface Hub, but when I try to load it using the load_dataset command, it shows that it is downloading the files, but throws a ValueError. When I went to my directory to see if the files were downloaded, the folder was blank.

Here is the error below:
ValueError                                Traceback (most recent call last)
Input In [8], in <cell line: 3>()
      1 from datasets import load_dataset
----> 3 dataset = load_dataset("TheNoob3131/mosquito-data", split="train")

File ~\Anaconda3\lib\site-packages\datasets\load.py:1679, in load_dataset(path, name, data_dir, data_files, split, cache_dir, features, download_config, download_mode, ignore_verifications, keep_in_memory, save_infos, revision, use_auth_token, task, streaming, **config_kwargs)
   1676 try_from_hf_gcs = path not in _PACKAGED_DATASETS_MODULES
   1678 # Download and prepare data
-> 1679 builder_instance.download_and_prepare(
   1680     download_config=download_config,
   1681     download_mode=download_mode,
   1682     ignore_verifications=ignore_verifications,
   1683     try_from_hf_gcs=try_from_hf_gcs,
   1684     use_auth_token=use_auth_token,
   1685 )
   1687 # Build dataset for splits
   1688 keep_in_memory = (
   1689     keep_in_memory if keep_in_memory is not None else is_small_dataset(builder_instance.info.dataset_size)
   1690 )

Is the dataset in the wrong format or is there some security permission that I should enable?

Comments:
I am also getting a ValueError: 'Couldn't cast' at the bottom. Is this because of some delimiter issue? My dataset is on the Huggingface Hub. If you could look at it, that would be greatly appreciated.

Hi @thenerd31, thanks for reporting.

Please note that your issue is not caused by the Hugging Face Datasets library, but it has to do with the specific implementation of your dataset on the Hub.

Therefore, I'm transferring this discussion to your own dataset Community tab: https://huggingface.co/datasets/TheNoob3131/mosquito-data/discussions/1
Issue: Dataset Viewer issue for LawalAfeez/englishreview-ds-mini

### Link

_No response_

### Description

Unable to view the split data

### Owner

_No response_

Comments:
It's currently working, as far as I understand

https://huggingface.co/datasets/LawalAfeez/englishreview-ds-mini/viewer/LawalAfeez--englishreview-ds-mini/train

<img width="1556" alt="Capture d’écran 2022-07-19 à 09 24 01" src="https://user-images.githubusercontent.com/1676121/179761130-2d7980b9-c0f6-4093-8b1d-f0a3872fef3f.png">

---

What was your issue?
Issue: Document how to create a dataset loading script for audio/vision

Currently, in our docs for Audio/Vision/Text, we explain how to:
- Load data
- Process data

However we only explain how to *Create a dataset loading script* for text data.

I think it would be useful that we add the same for Audio/Vision as these have some specificities different from Text.

See, for example:
- #4697
  - and comment there: https://github.com/huggingface/datasets/issues/4697#issuecomment-1191502492

CC: @stevhliu 


Comments:
I'm closing this issue as both the Audio and Image sections now have a "Create dataset" page that contains the info about writing the loading script version of a dataset.
Issue: Dataset Viewer issue for TheNoob3131/mosquito-data

### Link

_No response_

### Description

Getting this error when trying to view dataset preview: 
Message:       401, message='Unauthorized', url=URL('https://huggingface.co/datasets/TheNoob3131/mosquito-data/resolve/8aceebd6c4a359d216d10ef020868bd9e8c986dd/0_Africa_train.csv')


### Owner

_No response_

Comments:
Thanks for reporting. I refreshed the dataset viewer and it now works as expected.

https://huggingface.co/datasets/TheNoob3131/mosquito-data

<img width="1135" alt="Capture d’écran 2022-07-18 à 13 15 22" src="https://user-images.githubusercontent.com/1676121/179566497-e47f1a27-fd84-4a8d-9d7f-2e0f2da803df.png">

We will investigate why it occurred in the first place


By chance, could you provide some details about the operations done on the dataset: was it private? gated?

Yes, it was a private dataset, and when I made it public, the Dataset Preview did not work. 

However, now when I make the dataset private, it says that the Dataset Preview has been disabled. Why is this?

Thanks for the details. For now, the dataset viewer is always disabled on private datasets (see https://huggingface.co/docs/hub/datasets-viewer for more details)

Hi, it was working fine for a few hours, but then I can't see the dataset viewer again (public dataset). Why is this still happening?
It's the same error too:
![image](https://user-images.githubusercontent.com/53668030/179602465-f220f971-d3aa-49ba-a31b-60510f4c2a89.png)


OK? This is a bug, thanks for help spotting and reproducing it (it occurs when a dataset is switched to private, then to public). We will be working on it, meanwhile, I've restored the dataset viewer manually again.
Issue: Distributed data parallel training for streaming datasets

### Feature request

Any documentations for the the `load_dataset(streaming=True)` for (multi-node multi-GPU) DDP training? 

### Motivation

Given a bunch of data files, it is expected to split them onto different GPUs. Is there a guide or documentation?

### Your contribution

Does it requires manually split on data files for each worker in `DatasetBuilder._split_generator()`? What is`IterableDatasetShard` expected to do?

Comments:
Hi ! According to https://huggingface.co/docs/datasets/use_with_pytorch#stream-data you can use the pytorch DataLoader with `num_workers>0` to distribute the shards across your workers (it uses `torch.utils.data.get_worker_info()` to get the worker ID and select the right subsets of shards to use)


 EDIT: here is a code example 

```python
# ds = ds.with_format("torch")
# dataloader = DataLoader(ds, num_workers=num_workers)
```

EDIT: `with_format("torch")` is not required, now you can just do
```python
dataloader = DataLoader(ds, num_workers=num_workers)
```

@cyk1337 does streaming datasets with multi-gpu works for you? I am testing on one node with multiple gpus, but this is freezing, https://github.com/huggingface/datasets/issues/5123 
In case you could make this work, could you share with me your data-loading codes?
thank you

+1

This has been implemented in `datasets` 2.8:
```python
from datasets.distributed import split_dataset_by_node

ds = split_dataset_by_node(ds, rank=rank, world_size=world_size)
```

docs: https://huggingface.co/docs/datasets/use_with_pytorch#distributed

i'm having hanging issues with this when using DDP and allocating the datasets with `split_dataset_by_node` 🤔

--- 
### edit
I don't want to pollute this thread, but for the sake of following up, I observed hanging close to the final iteration of the dataloader. I think this was happening on the final shard. First, I removed the final shard and things worked. Then (including all shards), I reordered the list of shards: `load_dataset('json', data_files=reordered, streaming=True)` and no hang. 

I won't open an issue yet bc I am not quite sure about this observation.

@wconnell would you mind opening a different bug issue and giving more details?
https://github.com/huggingface/datasets/issues/new?assignees=&labels=&template=bug-report.yml

Thanks.
Issue: Dataset Viewer issue for rajistics/indian_food_images

### Link

https://huggingface.co/datasets/rajistics/indian_food_images/viewer/rajistics--indian_food_images/train

### Description

I have a train/test split in my dataset 
<img width="410" alt="Screen Shot 2022-07-15 at 11 44 42 AM" src="https://user-images.githubusercontent.com/6808012/179293215-7b419ec3-3527-46f2-8dad-adbc5568cfa0.png">
t
The dataset viewer works for the test split (images of indian food), but does not show my train split.  My guess is maybe there is some corrupt image file that is guessing this.  But I have no idea.

The original dataset was pulled from here: https://www.kaggle.com/datasets/l33tc0d3r/indian-food-classification?resource=download-directory


### Owner

Yes

Comments:
Hi, thanks for reporting. I triggered a refresh of the preview for this dataset, and it works now. I'm not sure what occurred.
<img width="1019" alt="Capture d’écran 2022-07-18 à 11 01 52" src="https://user-images.githubusercontent.com/1676121/179541327-f62ecd5e-a18a-4d91-b316-9e2ebde77a28.png">
Issue: How to assign new values to Dataset?

![image](https://user-images.githubusercontent.com/37113676/179149159-bbbda0c8-a661-403c-87ed-dc2b4219cd68.png)

Hi, if I want to change some values of the dataset, or add new columns to it, how can I do it?

For example, I want to change all the labels of the SST2 dataset to `0`:
```python
from datasets import load_dataset
data = load_dataset('glue','sst2')

data['train']['label'] = [0]*len(data)
```

I will get the error:
```
TypeError: 'Dataset' object does not support item assignment
```

Comments:
Hi! One option is use `map` with a function that overwrites the labels (`dset = dset.map(lamba _: {"label": 0}, features=dset.features`)). Or you can use the `remove_column` + `add_column` combination (`dset = dset.remove_columns("label").add_column("label", [0]*len(data)).cast(dset.features)`, but note that this approach creates an in-memory table for the added column instead of writing to disk, which could be problematic for large datasets.

Hi! I tried your proposed solution, but it does not solve my problem unfortunately. I am working with a set of protein sequences that have been tokenized with ESM, but some sequences are longer than `max_length`, they have been truncated in the tokenization. So now I want to truncate my labels as well, but that does not work with a mapping (e.g. `dset.map` as you suggested). Specifically, what I did was the following:

```
def postprocess_tokenize(tokenized_data):
    """
    adjust label lengths if they dont match.
    """
    if len(tokenized_data['input_ids']) < len(tokenized_data['labels']):
        new_labels = tokenized_data['labels'][:len(tokenized_data['input_ids'])]
        tokenized_data["labels"] = new_labels
    return tokenized_data

tokenized_data = tokenized_data.map(postprocess_tokenize, batched=True) # this does not adjust the labels...
```

Any tips on how to do this properly?

More generally, I am wondering why the DataCollator supports padding but does not support truncation? Seems odd to me.

Thanks in advance!
Issue: IndexError when loading ImageFolder

## Describe the bug
Loading an image dataset with `imagefolder` throws `IndexError: list index out of range` when the given folder contains a non-image file (like a csv).

## Steps to reproduce the bug
Put a csv file in a folder with images and load it:
```python
import datasets
 datasets.load_dataset("imagefolder", data_dir=path/to/folder)
```

## Expected results
I would expect a better error message, like `Unsupported file` or even the dataset loader just ignoring every file that is not an image in that case.

## Actual results
Here is the whole traceback:

## Environment info
<!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
- `datasets` version: 2.3.2
- Platform: Linux-5.11.0-051100-generic-x86_64-with-glibc2.27
- Python version: 3.9.9
- PyArrow version: 8.0.0
- Pandas version: 1.4.3


Comments:
Hi, thanks for reporting! If there are no examples in ImageFolder, the `label` column is of type `ClassLabel(names=[])`, which leads to an error in [this line](https://github.com/huggingface/datasets/blob/c15b391942764152f6060b59921b09cacc5f22a6/src/datasets/arrow_writer.py#L387) as `asdict(info)` calls `Features({..., "label": {'num_classes': 0, 'names': [], 'id': None, '_type': 'ClassLabel'}})`, which then calls `require_decoding` [here](https://github.com/huggingface/datasets/blob/c15b391942764152f6060b59921b09cacc5f22a6/src/datasets/features/features.py#L1516) on the dict value it does not expect.

I see two ways to fix this:
* custom `asdict` where `dict_factory` is also applied on the `dict` object itself besides dataclasses (the built-in implementation calls `type(dict_obj)` - this means we also need to fix `Features.to_dict` btw) 
* implement `DatasetInfo.to_dict` (though adding `to_dict` to a data class is a bit weird IMO)

@lhoestq Which one of these approaches do you like more?


Small pref for the first option, it feels weird to know that `Features()` can be called with a dictionary of types defined as dictionaries instead of type instances.
Issue: Dataset Viewer issue for codeparrot/xlcost-text-to-code

### Link

https://huggingface.co/datasets/codeparrot/xlcost-text-to-code

### Description

Error
```
Server Error
Status code:   400
Exception:     TypeError
Message:       'NoneType' object is not iterable
```
Before I did a minor change in the dataset script (removing some comments), the viewer was working but not properely, it wasn't showing the dataset subsets. But the data can be loaded successfully.

Thanks!

### Owner

Yes

Comments:
There seems to be an issue with the `C++-snippet-level` config:

```python
>>> from datasets import get_dataset_split_names
>>> get_dataset_split_names("codeparrot/xlcost-text-to-code", "C++-snippet-level")
Traceback (most recent call last):
  File "/home/slesage/hf/datasets-server/services/worker/.venv/lib/python3.9/site-packages/datasets/inspect.py", line 352, in get_dataset_config_info
    info.splits = {
TypeError: 'NoneType' object is not iterable

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/slesage/hf/datasets-server/services/worker/.venv/lib/python3.9/site-packages/datasets/inspect.py", line 404, in get_dataset_split_names
    info = get_dataset_config_info(
  File "/home/slesage/hf/datasets-server/services/worker/.venv/lib/python3.9/site-packages/datasets/inspect.py", line 359, in get_dataset_config_info
    raise SplitsNotFoundError("The split names could not be parsed from the dataset config.") from err
datasets.inspect.SplitsNotFoundError: The split names could not be parsed from the dataset config.
```

I remove the dataset-viewer tag since it's not directly related.

Pinging @huggingface/datasets 

Thanks I found that this subset wasn't properly defined the the config, I fixed it. Now I can see the subsets but I get this error for the viewer
````
Status code:   400
Exception:     Status400Error
Message:       The split cache is empty.
```

Yes, the cache is being refreshed, hopefully, it will work in some minutes for all the splits. Some are already here:

https://huggingface.co/datasets/codeparrot/xlcost-text-to-code/viewer/Python-snippet-level/train

<img width="1533" alt="Capture d’écran 2022-07-18 à 12 04 06" src="https://user-images.githubusercontent.com/1676121/179553933-64d874fa-ada9-4b82-900e-082619523c20.png">


I think all the splits are working as expected now

Perfect, thank you!
Issue: Cant pass streaming dataset to dataloader after take()

## Describe the bug
I am trying to pass a streaming version of c4 to a dataloader, but it can't be passed after I call `dataset.take(n)`. Some functions such as `shuffle()` can be applied without breaking the dataloader but not take.

## Steps to reproduce the bug
```python
import datasets
import torch

dset = datasets.load_dataset(path='c4', name='en', split="train", streaming=True)
dset = dset.take(50_000)
dset = dset.with_format("torch")

num_workers = 8
batch_size = 512

loader = torch.utils.data.DataLoader(dataset=dset,
                                     batch_size=batch_size,
                                     num_workers=num_workers)
for batch in loader:
    ...
```

## Expected results
No error thrown when iterating over the dataloader

## Actual results
Original Traceback (most recent call last):
  File "/usr/local/lib/python3.9/dist-packages/torch/utils/data/_utils/worker.py", line 287, in _worker_loop
    data = fetcher.fetch(index)
  File "/usr/local/lib/python3.9/dist-packages/torch/utils/data/_utils/fetch.py", line 32, in fetch
    data.append(next(self.dataset_iter))
  File "/root/.local/lib/python3.9/site-packages/datasets/formatting/dataset_wrappers/torch_iterable_dataset.py", line 48, in __iter__
    for key, example in self._iter_shard(shard_idx):
  File "/root/.local/lib/python3.9/site-packages/datasets/iterable_dataset.py", line 586, in _iter_shard
    yield from ex_iterable.shard_data_sources(shard_idx)
  File "/root/.local/lib/python3.9/site-packages/datasets/iterable_dataset.py", line 60, in shard_data_sources
    raise NotImplementedError(f"{type(self)} doesn't implement shard_data_sources yet")
NotImplementedError: <class 'datasets.iterable_dataset.TakeExamplesIterable'> doesn't implement shard_data_sources yet

## Environment info
- `datasets` version: 2.3.2
- Platform: Linux-5.4.0-120-generic-x86_64-with-glibc2.31
- Python version: 3.9.13
- PyArrow version: 8.0.0
- Pandas version: 1.4.3


Comments:
Hi! Calling `take` on an iterable/streamable dataset makes it not possible to shard the dataset, which in turn disables multi-process loading (attempts to split the workload over the shards), so to go past this limitation, you can either use single-process loading in `DataLoader` (`num_workers=None`) or fetch the first `50_000/batch_size` batches in the loop.
Issue: Unable to use dataset with PyTorch dataloader

## Describe the bug

When using `.with_format("torch")`, an arrow table is returned and I am unable to use it by passing it to a PyTorch DataLoader: please see the code below.

## Steps to reproduce the bug
```python
from datasets import load_dataset
from torch.utils.data import DataLoader

ds = load_dataset(
    "para_crawl",
    name="enfr",
    cache_dir="/tmp/test/",
    split="train",
    keep_in_memory=True,
)

dataloader = DataLoader(ds.with_format("torch"), num_workers=32)
print(next(iter(dataloader)))
```

Is there something I am doing wrong? The documentation does not say much about the behavior of `.with_format()` so I feel like I am a bit stuck here :-/

Thanks in advance for your help!

## Expected results

The code should run with no error

## Actual results

```
AttributeError: 'str' object has no attribute 'dtype'
```

## Environment info
<!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
- `datasets` version: 2.3.2
- Platform: Linux-4.18.0-348.el8.x86_64-x86_64-with-glibc2.28
- Python version: 3.10.4
- PyArrow version: 8.0.0
- Pandas version: 1.4.3


Comments:
Hi! `para_crawl` has a single column of type `Translation`, which stores translation dictionaries. These dictionaries can be stored in a NumPy array but not in a PyTorch tensor since PyTorch only supports numeric types. In `datasets`, the conversion to `torch` works as follows: 
1. convert PyArrow table to NumPy arrays 
2. convert NumPy arrays to Torch tensors. 

The 2nd step is problematic for your case as `datasets` attempts to convert the array of dictionaries to a PyTorch tensor. One way to fix this is to use the [preprocessing logic](https://github.com/huggingface/transformers/blob/8581a798c0a48fca07b29ce2ca2ef55adcae8c7e/examples/pytorch/translation/run_translation.py#L440-L458) from the Transformers translation script. And on our side, I think we can replace a NumPy array of dicts with a dict of NumPy array if the feature type is `Translation`/`TranslationVariableLanguages` (one array for each language) to get the official PyTorch error message for strings in such case.
Issue: Issue loading datasets -- pyarrow.lib has no attribute

## Describe the bug
I am trying to load sentiment analysis datasets from huggingface, but any dataset I try to use via load_dataset, I get the same error:
`AttributeError: module 'pyarrow.lib' has no attribute 'IpcReadOptions'`

## Steps to reproduce the bug
```python
dataset = load_dataset("glue", "cola")
```

## Expected results
Download datasets without issue.

## Actual results
`AttributeError: module 'pyarrow.lib' has no attribute 'IpcReadOptions'`

## Environment info
<!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
- `datasets` version: 2.3.2
- Platform: macOS-10.15.7-x86_64-i386-64bit
- Python version: 3.8.5
- PyArrow version: 8.0.0
- Pandas version: 1.1.0


Comments:
Hi @margotwagner, thanks for reporting.

Unfortunately, I'm not able to reproduce your bug: in an environment with datasets-2.3.2 and pyarrow-8.0.0, I can load the datasets without any problem:
```python
>>> ds = load_dataset("glue", "cola")
>>> ds
DatasetDict({
    train: Dataset({
        features: ['sentence', 'label', 'idx'],
        num_rows: 8551
    })
    validation: Dataset({
        features: ['sentence', 'label', 'idx'],
        num_rows: 1043
    })
    test: Dataset({
        features: ['sentence', 'label', 'idx'],
        num_rows: 1063
    })
})

>>> import pyarrow
>>> pyarrow.__version__
8.0.0
>>> from pyarrow.lib import IpcReadOptions
>>> IpcReadOptions
pyarrow.lib.IpcReadOptions
```

I think you may have a problem in your Python environment: maybe you have also an old version of pyarrow that has precedence when importing it.

Could you please check this (just after you tried to load the dataset and got the error)?
```python
>>> import pyarrow
>>> pyarrow.__version__
```
Issue: Dataset Viewer issue for wmt16

### Link

https://huggingface.co/datasets/wmt16

### Description

[Reported](https://huggingface.co/spaces/autoevaluate/model-evaluator/discussions/12#62cb83f14c7f35284e796f9c) by a user of AutoTrain Evaluate. AFAIK this dataset was working 1-2 weeks ago, and I'm not sure how to interpret this error.

```
Status code:   400
Exception:     NotImplementedError
Message:       This is a abstract method
```

Thanks!

### Owner

No

Comments:
Thanks for reporting, @lewtun.

~We can't load the dataset locally, so I think this is an issue with the loading script (not the viewer).~

 We are investigating...

Recently, there was a merged PR related to this dataset:
- #4554

We are looking at this...

Indeed, the above mentioned PR fixed the loading script (it was not working before).

I'm forcing the refresh of the Viewer.

Please note that the above mentioned PR also made an enhancement in the `datasets` library, required by this loading script. This enhancement will only be available to the Viewer once we make our next release.

OK, it's working now.

https://huggingface.co/datasets/wmt16/viewer/ro-en/test

<img width="1434" alt="Capture d’écran 2022-09-08 à 10 15 55" src="https://user-images.githubusercontent.com/1676121/189071665-17d2d149-9b22-42bf-93ac-1a966c3f637a.png">


Thank you @severo !!
Issue: Can't extract files from `.7z` zipfile using `download_and_extract`

## Describe the bug
I'm adding a new dataset which is a `.7z` zip file in Google drive and contains 3 json files inside. I'm able to download the data files using `download_and_extract` but after downloading it throws this error:
```
>>> dataset = load_dataset("./datasets/mantis/")
Using custom data configuration default
Downloading and preparing dataset mantis/default to /Users/bhavitvyamalik/.cache/huggingface/datasets/mantis/default/1.1.0/611affa804ec53e2055a335cc1b8b213bb5a0b5142d919967729d5ee23c6bab4...
Downloading data: 100%|█████████████████████████████████████████████████████████| 77.2M/77.2M [00:23<00:00, 3.28MB/s]
/Users/bhavitvyamalik/.cache/huggingface/datasets/downloads/fc3d70123c9de8407587a59aa426c37819cf2bf016795d33270e8a1d558a34e6
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/bhavitvyamalik/Desktop/work/hf/datasets/src/datasets/load.py", line 1745, in load_dataset
    use_auth_token=use_auth_token,
  File "/Users/bhavitvyamalik/Desktop/work/hf/datasets/src/datasets/builder.py", line 595, in download_and_prepare
    dl_manager=dl_manager, verify_infos=verify_infos, **download_and_prepare_kwargs
  File "/Users/bhavitvyamalik/Desktop/work/hf/datasets/src/datasets/builder.py", line 690, in _download_and_prepare
    ) from None
OSError: Cannot find data file. 
Original error:
[Errno 20] Not a directory: '/Users/bhavitvyamalik/.cache/huggingface/datasets/downloads/fc3d70123c9de8407587a59aa426c37819cf2bf016795d33270e8a1d558a34e6/merged_train.json'
```
just before generating the splits. I checked `fc3d70123c9de8407587a59aa426c37819cf2bf016795d33270e8a1d558a34e6` file and it's `7z` zip file (similar to downloaded Google drive file) which means it didn't get unzip. Do I need to unzip it separately and then pass the paths for train,dev,test files in `SplitGenerator`?

## Environment info
- `datasets` version: 1.18.4.dev0
- Platform: Darwin-19.6.0-x86_64-i386-64bit
- Python version: 3.7.8
- PyArrow version: 5.0.0

Comments:
Hi @bhavitvyamalik, thanks for reporting.

Yes, currently we do not support 7zip archive compression: I think we should.

As a workaround, you could uncompress it explicitly, like done in e.g. `samsum` dataset: 

https://github.com/huggingface/datasets/blob/fedf891a08bfc77041d575fad6c26091bc0fce52/datasets/samsum/samsum.py#L106-L110


Related to this issue: https://github.com/huggingface/datasets/issues/3541

Sure, let me look into and check what can be done. Will keep you guys updated here!

Initially, I thought of solving this without any external dependency. Almost everywhere I saw `lzma` can be used for this but there is a caveat that lzma doesn’t work with 7z archives but only single files. In my case the 7z archive has multiple files so it didn't work. Is it fine to use external library here?

Hi @bhavitvyamalik, thanks for your investigation.

On Monday, I started a PR that will eventually close this issue as well: I'm linking it to this.
- #4672

Let me know what you think.
Issue: loading oscar-corpus/OSCAR-2201  raises an error

## Describe the bug
load_dataset('oscar-2201', 'af')

raises an error:
Traceback (most recent call last):
  File "/usr/lib/python3.8/code.py", line 90, in runcode
    exec(code, self.locals)
  File "<input>", line 1, in <module>
  File "..python3.8/site-packages/datasets/load.py", line 1656, in load_dataset
    builder_instance = load_dataset_builder(
  File ".../lib/python3.8/site-packages/datasets/load.py", line 1439, in load_dataset_builder
    dataset_module = dataset_module_factory(
  File ".../lib/python3.8/site-packages/datasets/load.py", line 1189, in dataset_module_factory
    raise FileNotFoundError(
FileNotFoundError: Couldn't find a dataset script at .../oscar-2201/oscar-2201.py or any data file in the same directory. Couldn't find 'oscar-2201' on the Hugging Face Hub either: FileNotFoundError: Couldn't find file at https://raw.githubusercontent.com/huggingface/datasets/master/datasets/oscar-2201/oscar-2201.py


I've tried other permutations such as : 
oscar_22 = load_dataset('oscar-2201', 'af',use_auth_token=True)
oscar_22 = load_dataset('oscar-corpus/OSCAR-2201', 'af',use_auth_token=True)
oscar_22 = load_dataset('oscar-2201', 'af')
oscar_22 = load_dataset('oscar-corpus/OSCAR-2201')


with the same unfortunate result.


## Steps to reproduce the bug
oscar_22 = load_dataset('oscar-2201', 'af',use_auth_token=True)
oscar_22 = load_dataset('oscar-corpus/OSCAR-2201', 'af',use_auth_token=True)
oscar_22 = load_dataset('oscar-2201', 'af')
oscar_22 = load_dataset('oscar-corpus/OSCAR-2201')
# Sample code to reproduce the bug
```

## Expected results
loaded data

## Actual results
Traceback (most recent call last):
  File "/usr/lib/python3.8/code.py", line 90, in runcode
    exec(code, self.locals)
  File "<input>", line 1, in <module>
  File "..python3.8/site-packages/datasets/load.py", line 1656, in load_dataset
    builder_instance = load_dataset_builder(
  File ".../lib/python3.8/site-packages/datasets/load.py", line 1439, in load_dataset_builder
    dataset_module = dataset_module_factory(
  File ".../lib/python3.8/site-packages/datasets/load.py", line 1189, in dataset_module_factory
    raise FileNotFoundError(
FileNotFoundError: Couldn't find a dataset script at .../oscar-2201/oscar-2201.py or any data file in the same directory. Couldn't find 'oscar-2201' on the Hugging Face Hub either: FileNotFoundError: Couldn't find file at https://raw.githubusercontent.com/huggingface/datasets/master/datasets/oscar-2201/oscar-2201.py

## Environment info
<!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
- `datasets` version: 2.3.2
- Platform: Linux-5.13.0-37-generic-x86_64-with-glibc2.29
- Python version: 3.8.10
- PyArrow version: 8.0.0
- Pandas version: 1.4.3



Comments:
I had to use the appropriate token for use_auth_token. Thank you.
Issue: Issues with concatenating datasets

## Describe the bug
It is impossible to concatenate datasets if a feature is sequence of dict in one dataset and a dict of sequence in another. But based on the document, it should be automatically converted.

> A [datasets.Sequence](https://huggingface.co/docs/datasets/v2.3.2/en/package_reference/main_classes#datasets.Sequence) with a internal dictionary feature will be automatically converted into a dictionary of lists. This behavior is implemented to have a compatilbity layer with the TensorFlow Datasets library but may be un-wanted in some cases. If you don’t want this behavior, you can use a python list instead of the [datasets.Sequence](https://huggingface.co/docs/datasets/v2.3.2/en/package_reference/main_classes#datasets.Sequence).

## Steps to reproduce the bug
```python
from datasets import concatenate_datasets, load_dataset

squad = load_dataset("squad_v2")
squad["train"].to_json("output.jsonl", lines=True)

temp = load_dataset("json", data_files={"train": "output.jsonl"})
concatenate_datasets([temp["train"], squad["train"]])
```

## Expected results
No error executing that code

## Actual results
```
ValueError: The features can't be aligned because the key answers of features {'id': Value(dtype='string', id=None), 'title': Value(dtype='string', id=None), 'context': Value(dtype='string', id=None), 'question': Value(dtype='string', id=None), 'answers': Sequence(feature={'text': Value(dtype='string', id=None), 'answer_start': Value(dtype='int32', id=None)}, length=-1, id=None)} has unexpected type - Sequence(feature={'text': Value(dtype='string', id=None), 'answer_start': Value(dtype='int32', id=None)}, length=-1, id=None) (expected either {'text': Sequence(feature=Value(dtype='string', id=None), length=-1, id=None), 'answer_start': Sequence(feature=Value(dtype='int64', id=None), length=-1, id=None)} or Value("null").
```

## Environment info
- `datasets` version: 2.3.2
- Platform: macOS-12.4-arm64-arm-64bit
- Python version: 3.8.11
- PyArrow version: 6.0.1
- Pandas version: 1.3.5


Comments:
Hi! I agree we should improve the features equality checks to account for this particular case. However, your code fails due to `answer_start` having the dtype `int64` instead of `int32` after loading from JSON (it's not possible to embed type precision info into a JSON file; `save_to_disk` does that for arrow files), which would lead to the concatenation error as PyArrow does not support this sort of type promotion. This can be fixed as follows:
```python
temp = load_dataset("json", data_files={"train": "output.jsonl"}, features=squad["train"].features)
``` 

That makes sense. I totally missed the `int64` and `int32` part. Thanks for pointing it out! Will close this issue for now.
Issue: Unable to create dataset having Python dataset script only

## Describe the bug
Hi there,

I'm trying to add the following dataset to Huggingface datasets: https://huggingface.co/datasets/Heriot-WattUniversity/dialog-babi/blob/

I'm trying to do so using the CLI commands but seems that this command generates the wrong `dataset_info.json` file (you can find it in the repo already):
```
datasets-cli test Heriot-WattUniversity/dialog-babi/dialog_babi.py --save_infos --all-configs
```
while it errors when I remove the python script:
```
datasets-cli test Heriot-WattUniversity/dialog-babi/ --save_infos --all-configs 
```
The error message is the following:
```
FileNotFoundError: Unable to resolve any data file that matches '['**']' at /Users/as2180/workspace/Heriot-WattUniversity/dialog-babi with any supported extension ['csv', 'tsv', 'json', 'jsonl', 'parquet', 'txt', 'blp', 'bmp', 'dib', 'bufr', 'cur', 'pcx', 'dcx', 'dds', 'ps', 'eps', 'fit', 'fits', 'fli', 'flc', 'ftc', 'ftu', 'gbr', 'gif', 'grib', 'h5', 'hdf', 'png', 'apng', 'jp2', 'j2k', 'jpc', 'jpf', 'jpx', 'j2c', 'icns', 'ico', 'im', 'iim', 'tif', 'tiff', 'jfif', 'jpe', 'jpg', 'jpeg', 'mpg', 'mpeg', 'msp', 'pcd', 'pxr', 'pbm', 'pgm', 'ppm', 'pnm', 'psd', 'bw', 'rgb', 'rgba', 'sgi', 'ras', 'tga', 'icb', 'vda', 'vst', 'webp', 'wmf', 'emf', 'xbm', 'xpm', 'zip']
```

## Environment info
- `datasets` version: 2.3.2
- Platform: macOS-12.4-arm64-arm-64bit
- Python version: 3.9.9
- PyArrow version: 8.0.0
- Pandas version: 1.4.3

Comments:
Hi @aleSuglia, thanks for reporting.

We are having a look at it. 

We transfer this issue to the Community tab of the corresponding Hub dataset: https://huggingface.co/datasets/Heriot-WattUniversity/dialog-babi/discussions
Issue: Add SQuAD2.0 Dataset

## Adding a Dataset
- **Name:** *SQuAD2.0*
- **Description:** *Stanford Question Answering Dataset (SQuAD) is a reading comprehension dataset, consisting of questions posed by crowdworkers on a set of Wikipedia articles, where the answer to every question is a segment of text, or span, from the corresponding reading passage, or the question might be unanswerable.*
- **Paper:** *https://aclanthology.org/P18-2124.pdf*
- **Data:** *https://rajpurkar.github.io/SQuAD-explorer/*
- **Motivation:** *Dataset for training and evaluating models of conversational response*


Comments:
Hey, It's already present [here](https://huggingface.co/datasets/squad_v2) 

Hi! This dataset is indeed already available on the Hub. Closing.
Issue: Add Amazon-QA Dataset

## Adding a Dataset
- **Name:** *Amazon-QA*
- **Description:** *The dataset is .jsonl format, where each line in the file is a json string that corresponds to a question, existing answers to the question and the extracted review snippets (relevant to the question).*
- **Paper:** *https://github.com/amazonqa/amazonqa/tree/master/paper*
- **Data:** *https://huggingface.co/datasets/sentence-transformers/embedding-training-data/resolve/main/amazon-qa.jsonl.gz*
- **Motivation:** *Dataset for training and evaluating models of conversational response*


Comments:
uploaded dataset [here](https://huggingface.co/datasets/embedding-data/Amazon-QA).
Issue: Simple Wikipedia

## Adding a Dataset
- **Name:** *Simple Wikipedia*
- **Description:** *Two different versions of the data set now exist. Both were generated by aligning Simple English Wikipedia and English Wikipedia. A complete description of the extraction process can be found in "Simple English Wikipedia: A New Simplification Task", William Coster and David Kauchak (2011).*
- **Paper:** *https://aclanthology.org/P11-2117/*
- **Data:** *https://huggingface.co/datasets/sentence-transformers/embedding-training-data/resolve/main/SimpleWiki.jsonl.gz*
- **Motivation:** *Dataset for training and evaluating models of conversational response*


Comments:
uploaded dataset [here](https://huggingface.co/datasets/embedding-data/simple-wiki).
Issue: Add Quora Question Triplets Dataset

## Adding a Dataset
- **Name:** *Quora Question Triplets*
- **Description:** *This dataset consists of over 400,000 lines of potential question duplicate pairs. Each line contains IDs for each question in the pair, the full text for each question, and a binary value that indicates whether the line truly contains a duplicate pair.*
- **Paper:** 
- **Data:** *https://huggingface.co/datasets/sentence-transformers/embedding-training-data/resolve/main/quora_duplicates_triplets.jsonl.gz*
- **Motivation:** *Dataset for training and evaluating models of conversational response*


Comments:
uploaded dataset [here](https://huggingface.co/datasets/embedding-data/QQP_triplets).
Issue: Add Altlex dataset

## Adding a Dataset
- **Name:** *Altlex*
- **Description:** *Git repository for software associated with the 2016 ACL paper "Identifying Causal Relations Using Parallel Wikipedia Articles.”*
- **Paper:** *https://aclanthology.org/P16-1135.pdf*
- **Data:** *https://huggingface.co/datasets/sentence-transformers/embedding-training-data/resolve/main/altlex.jsonl.gz*
- **Motivation:** *Dataset for training and evaluating models of conversational response*



Comments:
uploaded dataset [here](https://huggingface.co/datasets/embedding-data/altlex).
Issue: Add Sentence Compression Dataset

## Adding a Dataset
- **Name:** *Sentence Compression*
- **Description:** *Large corpus of uncompressed and compressed sentences from news articles.*
- **Paper:** *https://www.aclweb.org/anthology/D13-1155/*
- **Data:** *https://github.com/google-research-datasets/sentence-compression/tree/master/data*
- **Motivation:** *Dataset for training and evaluating models of conversational response*


Comments:
uploaded dataset [here](https://huggingface.co/datasets/embedding-data/sentence-compression).
Issue: Add Flickr 30k Dataset

## Adding a Dataset
- **Name:** *Flickr 30k*
- **Description:** *To produce the denotation graph, we have created an image caption corpus consisting of 158,915 crowd-sourced captions describing 31,783 images. This is an extension of our previous Flickr 8k Dataset. The new images and captions focus on people involved in everyday activities and events.*
- **Paper:** *https://transacl.org/ojs/index.php/tacl/article/view/229/33*
- **Data:** *https://huggingface.co/datasets/sentence-transformers/embedding-training-data/resolve/main/flickr30k_captions.jsonl.gz*
- **Motivation:** *Dataset for training and evaluating models of conversational response*


Comments:
uploaded dataset [here](https://huggingface.co/datasets/embedding-data/flickr30k-captions).
Issue: Add SPECTER dataset

## Adding a Dataset
- **Name:** *SPECTER*
- **Description:** *SPECTER: Document-level Representation Learning using Citation-informed Transformers*
- **Paper:** *https://doi.org/10.18653/v1/2020.acl-main.207*
- **Data:** *https://huggingface.co/datasets/sentence-transformers/embedding-training-data/resolve/main/specter_train_triples.jsonl.gz*
- **Motivation:** *Dataset for training and evaluating models of conversational response*


Comments:
uploaded dataset [here](https://huggingface.co/datasets/embedding-data/SPECTER)
Issue: Add PAQ dataset

## Adding a Dataset
- **Name:** *PAQ*
- **Description:** *This repository contains code and models to support the research paper PAQ: 65 Million Probably-Asked Questions and What You Can Do With Them*
- **Paper:** *https://arxiv.org/abs/2102.07033*
- **Data:** *https://huggingface.co/datasets/sentence-transformers/embedding-training-data/resolve/main/PAQ_pairs.jsonl.gz*
- **Motivation:** *Dataset for training and evaluating models of conversational response*


Comments:
uploaded dataset [here](https://huggingface.co/datasets/embedding-data/PAQ_pairs)