SurAyush/github_issues huggingface dataset:
Issue: How to assign new values to Dataset?
State: closed
Author: beyondguo

![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: Update create dataset card docs
State: closed
Author: stevhliu

This PR proposes removing the [online dataset card creator](https://huggingface.co/datasets/card-creator/) in favor of simply copy/pasting a template and using the [Datasets Tagger app](https://huggingface.co/spaces/huggingface/datasets-tagging) to generate the tags. The Tagger app provides more guidance by showing all possible values a user can select in the dropdown menus, whereas the online dataset card creator doesn't, which can make it difficult to know what tag values to input.

Let me know what you think! :)

Comments:
_The documentation is not available anymore as the PR was closed or merged._
Issue: weird issue/bug with columns (dataset iterable/stream mode)
State: open
Author: eunseojo

I have a dataset online (CloverSearch/cc-news-mutlilingual) that has a bunch of columns, two of which are "score_title_maintext" and "score_title_description". the original files are jsonl formatted. I was trying to iterate through via streaming mode and grab all "score_title_description" values, but I kept getting key not found after a certain point of iteration. I found that some json objects in the file don't have "score_title_description". And in SOME cases, this returns a NONE and in others it just gets a key error. Why is there an inconsistency here and how can I fix it?

Comments:
Issue: IndexError when loading ImageFolder
State: closed
Author: johko

## 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
State: closed
Author: loubnabnl

### 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()
State: open
Author: zankner

## 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
State: open
Author: BlueskyFR

## 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
State: closed
Author: margotwagner

## 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: Support extract 7-zip compressed data files
State: closed
Author: albertvillanova

Fix partially #3541, fix #4670.

Comments:
_The documentation is not available anymore as the PR was closed or merged._

Cool! Can you please remove `Fix #3541` from the description as this PR doesn't add support for streaming/`iter_archive`, so it only partially addresses the issue?

Side note:
I think we can use `libarchive` (`libarchive-c` is a Python package with the bindings) for streaming 7z archives. The only issue with this lib is that it's tricky to install on Windows/Mac.
Issue: Dataset Viewer issue for wmt16
State: closed
Author: lewtun

### 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`
State: closed
Author: bhavitvyamalik

## 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
State: closed
Author: vitalyshalumov

## 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.