Kokolipa/github-issues huggingface dataset:
Issue: load only England English dataset from common voice english dataset
State: closed
Labels: name: question

training_data = load_dataset("common_voice", "en",split='train[:250]+validation[:250]')
testing_data = load_dataset("common_voice", "en", split="test[:200]")

I'm trying to load only 8% of the English common voice data with accent == "England English." Can somebody assist me with this?

**Typical Voice Accent Proportions:**

- 24% United States English 
- 8% England English 
- 5% India and South Asia (India, Pakistan, Sri Lanka) 
- 3% Australian English 
- 3% Canadian English 
- 2% Scottish English 
- 1% Irish English 
- 1% Southern African (South Africa, Zimbabwe, Namibia) 
- 1% New Zealand English

Can we replicate this for Age as well?

**Age proportions of the common voice:-**

- 24% 19 - 29 
- 14% 30 - 39 
- 10% 40 - 49 
- 6% < 19 
- 4% 50 - 59 
- 4% 60 - 69 
- 1% 70 – 79 

Hi @amanjaiswal777,

First note that the dataset you are trying to load is deprecated: it was the Common Voice dataset release as of Dec 2020.

Currently, Common Voice dataset releases are directly hosted on the Hub, under the Mozilla Foundation organization: https://huggingface.co/mozilla-foundation

For example, to get their latest Common Voice relase (8.0):
- Go to the dataset page and request access permission (Mozilla Foundation requires this for people willing to use their datasets): https://huggingface.co/datasets/mozilla-foundation/common_voice_8_0
- Looking at the dataset card, you can check that data instances have, among other fields, the ones you are interested in: "accent", "age",... 
- Then you can load their "en" language dataset as usual, besides passing your authentication token (more info on auth token here: https://huggingface.co/docs/hub/security)
  ```python
  from datasets import load_dataset
  ds_en = load_dataset("mozilla-foundation/common_voice_8_0", "en", use_auth_token=True)
  ```
- Finally, you can filter only the data instances you are interested in (more info on `filter` here: https://huggingface.co/docs/datasets/process#select-and-filter):
  ```python
  ds_england_en = ds_en.filter(lambda item: item["accent"] == "England English")
  ```

Feel free to reopen this issue if you need further assistance.

Hey @albertvillanova trying the same approach as you with the common_voice_16_1 dataset. What I'm trying to do is to filter the valencian accent in the catalan subset. Gave me this error and I have everything it asks for decoding mp3:
![image](https://github.com/huggingface/datasets/assets/96977715/7ec02483-e728-4358-9372-ba74ec1b7fd4)

![image](https://github.com/huggingface/datasets/assets/96977715/c10fcf23-a141-4dba-a88d-89e293acfe67)
Issue: Add a data type for labeled images (image segmentation)
State: open
Labels: name: enhancement

It might be a mix of Image and ClassLabel, and the color palette might be generated automatically.

---

### Example

every pixel in the images of the annotation column (in https://huggingface.co/datasets/scene_parse_150) has a value that gives its class, and the dataset itself is associated with a color palette (eg https://github.com/open-mmlab/mmsegmentation/blob/98a353b674c6052d319e7de4e5bcd65d670fcf84/mmseg/datasets/ade.py#L47) that maps every class with a color.

So we might want to render the image as a colored image instead of a black and white one.

<img width="785" alt="156741519-fbae6844-2606-4c28-837e-279d83d00865" src="https://user-images.githubusercontent.com/1676121/157005263-7058c584-2b70-465a-ad94-8a982f726cf4.png">

See https://github.com/tensorflow/datasets/blob/master/tensorflow_datasets/core/features/labeled_image.py for reference in Tensorflow
Issue: Making Hugging Face the place to go for Graph NNs datasets
State: open
Labels: name: dataset request

name: graph

Let's make Hugging Face Datasets the central hub for GNN datasets :)

**Motivation**. Datasets are currently quite scattered and an open-source central point such as the Hugging Face Hub would be ideal to support the growth of the GNN field.

What are some datasets worth integrating into the Hugging Face hub?

Instructions to add a new dataset can be found [here](https://github.com/huggingface/datasets/blob/master/ADD_NEW_DATASET.md).

Special thanks to @napoles-uach for his collaboration on identifying the first ones:

- [ ] [SNAP-Stanford OGB Datasets](https://github.com/snap-stanford/ogb).
- [ ] [SNAP-Stanford Pretrained GNNs Chemistry and Biology Datasets](https://github.com/snap-stanford/pretrain-gnns).
- [ ] [TUDatasets](https://chrsmrrs.github.io/datasets/) (A collection of benchmark datasets for graph classification and regression)

cc @osanseviero 


It will be indeed really great to add support to GNN datasets. Big :+1: for this initiative.

@napoles-uach identifies the [TUDatasets](https://chrsmrrs.github.io/datasets/) (A collection of benchmark datasets for graph classification and regression). 

Added to the Tasks in the initial issue.

Thanks Omar, that is a great collection!

Great initiative! Let's keep this issue for these 3 datasets, but moving forward maybe let's create a new issue per dataset :rocket: great work @napoles-uach and @omarespejel!
Issue: when using to_tf_dataset with shuffle is true, not all completed batches are made
State: closed
Labels: name: bug

## Describe the bug
when converting a dataset to tf_dataset by using to_tf_dataset with shuffle true, the remainder is not converted to one batch

## Steps to reproduce the bug
this is the sample code below
https://colab.research.google.com/drive/1_oRXWsR38ElO1EYF9ayFoCU7Ou1AAej4?usp=sharing


## Expected results
regardless of shuffle is true or not, 67 rows dataset should be 5 batches when batch size is 16.

## Actual results
4 batches

## Environment info
<!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
- `datasets` version: 1.18.3
- Platform: Linux-5.4.144+-x86_64-with-Ubuntu-18.04-bionic
- Python version: 3.7.12
- PyArrow version: 6.0.1


Maybe @Rocketknight1 can help here

Hi @greenned, this is expected behaviour for `to_tf_dataset`. By default, we drop the smaller 'remainder' batch during training (i.e. when `shuffle=True`). If you really want to keep that batch, you can set `drop_remainder=False` when calling `to_tf_dataset()`.

@Rocketknight1 Oh, thank you. I didn't get **drop_remainder** Have a nice day!

No problem!
Issue: [📄 Docs] Create a `datasets` performance guide.
State: open
Labels: name: enhancement

## Brief Overview
Downloading, saving, and preprocessing large datasets from the `datasets` library can often result in [performance bottlenecks](https://github.com/huggingface/datasets/issues/3735). These performance snags can be challenging to identify and to debug, especially for users who are less experienced with building deep learning experiments.

## Feature Request
Could we create a performance guide for using `datasets`, similar to:
* [Better performance with the `tf.data` API](https://github.com/huggingface/datasets/issues/3735)
* [Analyze `tf.data` performance with the TF Profiler](https://www.tensorflow.org/guide/data_performance_analysis)

This performance guide should detail practical options for improving performance with `datasets`, and enumerate any common best practices. It should also show how to use tools like the PyTorch Profiler or the TF Profiler to identify any performance bottlenecks (example below).

![image](https://user-images.githubusercontent.com/3712347/156859152-a3cb9565-3ec6-4d39-8e77-56d0a75a4954.png)

## Related Issues
* [wiki_dpr pre-processing performance #1670](https://github.com/huggingface/datasets/issues/1670)
* [Adjusting chunk size for streaming datasets #3499](https://github.com/huggingface/datasets/issues/3499)
* [how large datasets are handled under the hood #1004](https://github.com/huggingface/datasets/issues/1004)
* [using map on loaded Tokenizer 10x - 100x slower than default Tokenizer? #1830](https://github.com/huggingface/datasets/issues/1830)
* [Best way to batch a large dataset? #315](https://github.com/huggingface/datasets/issues/315)
* [Saving processed dataset running infinitely #1911](https://github.com/huggingface/datasets/issues/1911)

Hi ! Yes this is definitely something we'll explore, since optimizing processing pipelines can be challenging and because performance is key here: we want anyone to be able to play with large-scale datasets more easily.

I think we'll start by documenting the performance of the dataset transforms we provide, and then we can have some tools to help debugging/optimizing them
Issue: The Pile's _FEATURE spec seems to be incorrect
State: closed
Labels: name: bug

## Describe the bug
If you look at https://huggingface.co/datasets/the_pile/blob/main/the_pile.py:

For "all"
*  the pile_set_name is never set for data
* there's actually an id field inside of "meta" 

For subcorpora pubmed_central and hacker_news:
* the meta is specified to be a string, but it's actually a dict with an id field inside.

## Steps to reproduce the bug


## Expected results
Feature spec should match the data I'd think?

## Actual results
Specify the actual results or traceback.

## Environment info
<!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
- `datasets` version:
- Platform:
- Python version:
- PyArrow version:


Hi @dlwh, thanks for reporting.

Please note, that the source data files for "all" config are different from the other configurations.

The "all" config contains the official Pile data files, from https://mystic.the-eye.eu/public/AI/pile/
All data examples contain a "meta" dict with a single "pile_set_name" key:
```python
In [1]: from datasets import load_dataset
        ds = load_dataset("the_pile", "all", split="train", streaming=True)
        item = next(iter(ds))
Downloading builder script: 9.09kB [00:00, 4.42MB/s]

In [3]: item["meta"]
Out[3]: {'pile_set_name': 'Pile-CC'}
```

On the other hand, all the other subset configs data files come from the Pile preliminary components directory: https://mystic.the-eye.eu/public/AI/pile_preliminary_components/
For theses components, the "meta" field may have different keys depending on the subset: "id", "language", "pmid",... Because of that, if we had kept the `dict` data format for the "meta" field, we would have an error when trying to concatenate different subsets, whose "meta" keys are not identical. In order to avoid that, the "meta" field is cast to `str` in all these cases, so that there is no incompatibility in their "meta" data type when concatenating.

You can check, for example, that for "pubmed_central" the "meta" field is cast to `str`:
```python
In [4]: from datasets import load_dataset
        ds = load_dataset("the_pile", "pubmed_central", split="train", streaming=True)
        item = next(iter(ds))

In [5]: item["meta"]
Out[5]: "{'id': 'PMC6071596'}"
```

Feel free to reopen this issue if you have further questions.
Issue: Add Biwi Kinect Head Pose Database
State: closed
Labels: name: dataset request

name: vision

## Adding a Dataset
- **Name:** Biwi Kinect Head Pose Database
- **Description:** Over 15K images of 20 people recorded with a Kinect while turning their heads around freely. For each frame, depth and rgb images are provided, together with ground in the form of the 3D location of the head and its rotation angles.
- **Data:** [*link to the Github repository or current dataset location*](https://icu.ee.ethz.ch/research/datsets.html)
- **Motivation:** Useful pose estimation dataset

Instructions to add a new dataset can be found [here](https://github.com/huggingface/datasets/blob/master/ADD_NEW_DATASET.md).


Official dataset location : https://icu.ee.ethz.ch/research/datsets.html
In the "Biwi Kinect Head Pose Database" section, I do not find any information regarding "Downloading the dataset." . Do we mail the authors regarding this ?

I found the dataset on Kaggle : [Link](https://www.kaggle.com/kmader/biwi-kinect-head-pose-database) , but since 🤗 does not host any of the datasets, this would require the user to provide their Kaggle username and API key to download. 

Any inputs on how we could proceed ? Thank you.
[ Need your inputs here, @lhoestq or @mariosasko ]

Hi @dnaveenr! Thanks for tackling this issue. This link should work: https://data.vision.ee.ethz.ch/cvl/gfanelli/kinect_head_pose_db.tgz

#self-assign

Added in https://github.com/huggingface/datasets/pull/3903, thanks @dnaveenr !

@mariosasko Hi,
this link [https://data.vision.ee.ethz.ch/cvl/gfanelli/kinect_head_pose_db.tgz]
seems not working now. Do you have alternatives?

It would be cool to find a copy of the data and host it directly in https://huggingface.co/datasets/ETHZurich/biwi_kinect_head_pose

> It would be cool to find a copy of the data and host it directly in https://huggingface.co/datasets/ETHZurich/biwi_kinect_head_pose

Hi, you mean I can download it by running python script in your link?

This dataset repository only contains a script that points to the URL of the file that doesn't exist anymore, so it's not usable anymore either :/

> This dataset repository only contains a script that points to the URL of the file that doesn't exist anymore, so it's not usable anymore either :/

Then what did you mean 
"It would be cool to find a copy of the data and host it directly in https://huggingface.co/datasets/ETHZurich/biwi_kinect_head_pose"?
I don't understand the meaning of 'host'

If we find a copy of the data we can upload the file in the dataset repository on HF, since the original data is not available anymore
Issue: `pubmed_qa` checksum mismatch
State: closed
Labels: name: bug

name: duplicate

## Describe the bug
Loading [`pubmed_qa`](https://huggingface.co/datasets/pubmed_qa) results in a mismatched checksum error.

## Steps to reproduce the bug
```python
# Sample code to reproduce the bug
import datasets
try:
    datasets.load_dataset("pubmed_qa", "pqa_labeled")
except Exception as e:
    print(e)

try:
    datasets.load_dataset("pubmed_qa", "pqa_unlabeled")
except Exception as e:
    print(e)

try:
    datasets.load_dataset("pubmed_qa", "pqa_artificial")
except Exception as e:
    print(e)
```

## Expected results
Successful download.

## Actual results
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.9/site-packages/datasets/load.py", line 1702, in load_dataset
    builder_instance.download_and_prepare(
  File "/usr/local/lib/python3.9/site-packages/datasets/builder.py", line 594, in download_and_prepare
    self._download_and_prepare(
  File "/usr/local/lib/python3.9/site-packages/datasets/builder.py", line 665, in _download_and_prepare
    verify_checksums(
  File "/usr/local/lib/python3.9/site-packages/datasets/utils/info_utils.py", line 40, in verify_checksums
    raise NonMatchingChecksumError(error_msg + str(bad_urls))
datasets.utils.info_utils.NonMatchingChecksumError: Checksums didn't match for dataset source files:
['https://drive.google.com/uc?export=download&id=1RsGLINVce-0GsDkCLDuLZmoLuzfmoCuQ', 'https://drive.google.com/uc?export=download&id=15v1x6aQDlZymaHGP7cZJZZYFfeJt2NdS']

## Environment info
<!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
- `datasets` version: 1.18.3
- Platform: macOS
- Python version: 3.8.1
- PyArrow version: 3.0.0


Hi @jon-tow, thanks for reporting.

This issue was already reported and its root cause is a change in the Google Drive service. See:
- #3786 

We have already fixed it. See:
- #3787 

We are planning to make a patch release today.

In the meantime, you can get this fix by installing our library from the GitHub master branch:
```shell
pip install git+https://github.com/huggingface/datasets#egg=datasets
```
Then, if you had previously tried to load the data and got the checksum error, you should force the redownload of the data (before the fix, you just downloaded and cached the virus scan warning page, instead of the data file):
```shell
load_dataset("...", download_mode="force_redownload")
```
Issue: Add MetaShift dataset
State: closed
Labels: name: dataset request

name: vision

## Adding a Dataset
- **Name:** MetaShift
- **Description:**  collection of 12,868 sets of natural images across 410 classes-
- **Paper:** https://arxiv.org/abs/2202.06523v1
- **Data:** https://github.com/weixin-liang/metashift

Instructions to add a new dataset can be found [here](https://github.com/huggingface/datasets/blob/master/ADD_NEW_DATASET.md).


I would like to take this up and give it a shot. Any image specific - dataset guidelines to keep in mind ? Thank you.

#self-assign

I've started working on adding this dataset. I require some inputs on the following : 

Ref for the initial draft [here](https://github.com/dnaveenr/datasets/blob/add_metashift_dataset/datasets/metashift/metashift.py)
1. The dataset does not have a typical - train/test/val split. What do we do for the _split_generators() function ? How do we go about this ?
2. This dataset builds on the Visual Genome dataset, using a metadata file. The dataset is generated using generate_full_MetaShift.py script. By default, the authors choose to generate the dataset only for a SELECTED_CLASSES. The following script is used : 
Code : https://github.com/Weixin-Liang/MetaShift/blob/main/dataset/generate_full_MetaShift.py 
Info : https://metashift.readthedocs.io/en/latest/sub_pages/download_MetaShift.html#generate-the-full-metashift-dataset
Can I just copy over the required functions into the metashift.py to generate the dataset ?
3. How do we complete the _generate_examples for this dataset ?

The user has the ability to use default selected classes, get the complete dataset or add more specific additional classes. I think config would be a good option here.

Inputs, suggestions would be helpful. Thank you.

I think @mariosasko and @lhoestq should be able to help here 😄 

Hi ! Thanks for adding this dataset :) Let me answer your questions:

1. in this case you can put everything in the "train" split
2. Yes you can copy the script (provided you also include the MIT license of the code in the file header for example). Though we ideally try to not create new directories nor files when generating dataset, so if possible this script should be adapted to not create the file structure they mentioned, but instead yield the images one by one in `_generate_examples`. Let me know if you think this is feasible
3. see point 2 haha

> The user has the ability to use default selected classes, get the complete dataset or add more specific additional classes. I think config would be a good option here.

Yup ! We can also define a `selected_classes` parameter such that users can do
```python
load_dataset("metashift", selected_classes=["cat", "dog", ...])
```

Great. This is helpful. Thanks @lhoestq .
Regarding Point 2, I'll try using yield instead of creating the directories and see if its feasible. selected_classes config sounds good.

Closed via #3900
Issue: Checksums didn't match for datasets on Google Drive
State: closed
Labels: name: bug

name: duplicate

## Describe the bug

Datasets hosted on Google Drive do not seem to work right now.
Loading them fails with a checksum error.

## Steps to reproduce the bug
```python
from datasets import load_dataset
for dataset in ["head_qa", "yelp_review_full"]:
  try:
    load_dataset(dataset)
  except Exception as exception:
    print("Error", dataset, exception)
```

Here is a [colab](https://colab.research.google.com/drive/1wOtHBmL8I65NmUYakzPV5zhVCtHhi7uQ#scrollTo=cDzdCLlk-Bo4).

## Expected results

The datasets should be loaded.

## Actual results

```
Downloading and preparing dataset head_qa/es (download: 75.69 MiB, generated: 2.86 MiB, post-processed: Unknown size, total: 78.55 MiB) to /root/.cache/huggingface/datasets/head_qa/es/1.1.0/583ab408e8baf54aab378c93715fadc4d8aa51b393e27c3484a877e2ac0278e9...
Error head_qa Checksums didn't match for dataset source files:
['https://drive.google.com/u/0/uc?export=download&id=1a_95N5zQQoUCq8IBNVZgziHbeM-QxG2t']
Downloading and preparing dataset yelp_review_full/yelp_review_full (download: 187.06 MiB, generated: 496.94 MiB, post-processed: Unknown size, total: 684.00 MiB) to /root/.cache/huggingface/datasets/yelp_review_full/yelp_review_full/1.0.0/13c31a618ba62568ec8572a222a283dfc29a6517776a3ac5945fb508877dde43...
Error yelp_review_full Checksums didn't match for dataset source files:
['https://drive.google.com/uc?export=download&id=0Bz8a_Dbh9QhbZlU4dXhHTFhZQU0']
```

## Environment info
- `datasets` version: 1.18.3
- Platform: Linux-5.4.144+-x86_64-with-Ubuntu-18.04-bionic
- Python version: 3.7.12
- PyArrow version: 6.0.1


Hi @muelletm, thanks for reporting.

This issue was already reported and its root cause is a change in the Google Drive service. See:
- #3786 

We have already fixed it. See:
- #3787 

Until our next `datasets` library release, you can get this fix by installing our library from the GitHub master branch:
```shell
pip install git+https://github.com/huggingface/datasets#egg=datasets
```
Then, if you had previously tried to load the data and got the checksum error, you should force the redownload of the data (before the fix, you just downloaded and cached the virus scan warning page, instead of the data file):
```shell
load_dataset("...", download_mode="force_redownload")
```
Issue: Pre-Processing Cache Fails when using a Factory pattern
State: closed
Labels: name: bug

## Describe the bug
If you utilize a pre-processing function which is created using a factory pattern, the function hash changes on each run (even if the function is identical) and therefore the data will be reproduced each time.

## Steps to reproduce the bug
```python
    def preprocess_function_factory(augmentation=None):
        def preprocess_function(examples):
            # Tokenize the texts
            if augmentation:
                conversions1 = [
                    augmentation(example)
                    for example in examples[sentence1_key]
                ]
                if sentence2_key is None:
                    args = (conversions1,)
                else:
                    conversions2 = [
                        augmentation(example)
                        for example in examples[sentence2_key]
                    ]
                    args = (conversions1, conversions2)
            else:
                args = (
                    (examples[sentence1_key],)
                    if sentence2_key is None
                    else (examples[sentence1_key], examples[sentence2_key])
                )
            result = tokenizer(
                *args, padding=padding, max_length=max_seq_length, truncation=True
            )

            # Map labels to IDs (not necessary for GLUE tasks)
            if label_to_id is not None and "label" in examples:
                result["label"] = [
                    (label_to_id[l] if l != -1 else -1) for l in examples["label"]
                ]
            return result

        return preprocess_function

capitalize = lambda x: x.capitalize()
preprocess_function = preprocess_function_factory(augmentation=capitalize)
print(hash(preprocess_function)) # This will change on each run
raw_datasets = raw_datasets.map(
        preprocess_function,
        batched=True,
        load_from_cache_file=True,
        desc="Running transformation and tokenizer on dataset",
)
```

## Expected results
Running the code twice will cause the cache to be re-used.

## Actual results
Running the code twice causes the whole dataset to be re-processed


Ok - this is still an issue but I believe the root cause is different than I originally thought. I'm now able to get caching to work consistently with the above example as long as I fix the python hash seed `export PYTHONHASHSEED=1234`

Hi! 

Yes, our hasher should work with decorators. For instance, this dummy example:
```python
def f(arg):
    def f1(ex):
        return {"a": ex["col1"] + arg}
    return f1
```
gives the same hash across different Python sessions (`datasets.fingerprint.Hasher.hash(f("string1")` returns `"408c9059f89dbd6c"` on my machine).

Could you please make the example self-contained? This way, we can reproduce the bug. Additionally, you can try to find the problematic object yourself by testing their hash with `datasets.fingerprint.Hasher.hash(obj)`

This could be related to https://github.com/huggingface/datasets/issues/3638.

#3638 was indeed my issue. Thanks!
Issue: Text builder with custom separator line boundaries
State: open
Labels: name: enhancement

**Is your feature request related to a problem? Please describe.**
The current [Text](https://github.com/huggingface/datasets/blob/207be676bffe9d164740a41a883af6125edef135/src/datasets/packaged_modules/text/text.py#L23) builder implementation splits texts with `splitlines()` which splits the text on several line boundaries. Not all of them are always wanted. 

**Describe the solution you'd like**
```python
                if self.config.sample_by == "line":
                    batch_idx = 0
                    while True:
                        batch = f.read(self.config.chunksize)
                        if not batch:
                            break
                        batch += f.readline()  # finish current line
                        if self.config.custom_newline is None: 
                            batch = batch.splitlines(keepends=self.config.keep_linebreaks)
                        else:
                            batch = batch.split(self.config.custom_newline)[:-1]
                        pa_table = pa.Table.from_arrays([pa.array(batch)], schema=schema)
                        # Uncomment for debugging (will print the Arrow table size and elements)
                        # logger.warning(f"pa_table: {pa_table} num rows: {pa_table.num_rows}")
                        # logger.warning('\n'.join(str(pa_table.slice(i, 1).to_pydict()) for i in range(pa_table.num_rows)))
                        yield (file_idx, batch_idx), pa_table
                        batch_idx += 1
```

**A clear and concise description of what you want to happen.**
Creating the dataset rows with a subset of the `splitlines()` line boundaries.

Gently pinging @lhoestq

Hi ! Interresting :)

Could you give more details on what kind of separators you would like to use instead ?

In my case, I just want to use `\n` but not `U+2028`.

Ok I see, maybe there can be a `sep` parameter to allow users to specify what line/paragraph separator they'd like to use

Related to:
- #3729 
- #3910

Thanks for requesting this enhancement. We have recently found a somehow related issue with another dataset:
- #3704

Let me make a PR proposal.
Issue: can not flatten natural_questions dataset
State: closed
Labels: name: bug

## Describe the bug
after downloading the natural_questions dataset, can not flatten the dataset considering there are `long answer` and `short answer` in `annotations`.

## Steps to reproduce the bug
```python
from datasets import load_dataset

dataset = load_dataset('natural_questions',cache_dir = 'data/dataset_cache_dir')
dataset['train'].flatten()
```

## Expected results
a dataset with `long_answer` as features

## Actual results
Traceback (most recent call last):
  File "temp.py", line 5, in <module>
    dataset['train'].flatten()
  File "/Users/hannibal046/anaconda3/lib/python3.8/site-packages/datasets/fingerprint.py", line 413, in wrapper
    out = func(self, *args, **kwargs)
  File "/Users/hannibal046/anaconda3/lib/python3.8/site-packages/datasets/arrow_dataset.py", line 1296, in flatten
    dataset._data = update_metadata_with_features(dataset._data, dataset.features)
  File "/Users/hannibal046/anaconda3/lib/python3.8/site-packages/datasets/arrow_dataset.py", line 536, in update_metadata_with_features
    features = Features({col_name: features[col_name] for col_name in table.column_names})
  File "/Users/hannibal046/anaconda3/lib/python3.8/site-packages/datasets/arrow_dataset.py", line 536, in <dictcomp>
    features = Features({col_name: features[col_name] for col_name in table.column_names})
KeyError: 'annotations.long_answer'
## Environment info
<!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
- `datasets` version: 1.8.13
- Platform: MBP
- Python version: 3.8
- PyArrow version: 6.0.1


same issue. downgrade it to a lower version.

Thanks for reporting, I'll take a look tomorrow :)
Issue: Only-data dataset loaded unexpectedly as validation split
State: open
Labels: name: bug

## Describe the bug
As reported by @thomasw21 and @lhoestq, a dataset containing only a data file whose name matches the pattern `*dev*` will be returned as VALIDATION split, even if this is not the desired behavior, e.g. a file named `datosdevision.jsonl.gz`.

I see two options:
1. drop the "dev" keyword since it can be considered too generic
2. improve the pattern to something more reasonable, e.g. asking for a separator before and after "dev"
```python
["*[ ._-]dev[ ._-]*", "dev[ ._-]*"]
```

I think 2. is nice. If we agree on this one we can even decide to require the separation for the other split keywords "train", "test" etc.

Yes, I had something like that on mind: "dev" not being part of a word.
```
"[^a-zA-Z]dev[^a-zA-Z]"

Is there a reason why we want that regex? It feels like something that'll still be an issue for some weird case. "my_dataset_dev" doesn't match your regex, "my_dataset_validation" doesn't either ... Why not always "train" unless specified?

The regex is needed as part of our effort to make datasets configurable without code. In particular we define some generic dataset repository structures that users can follow

> ```
> "[^a-zA-Z]*dev[^a-zA-Z]*"
> ```

unfortunately our glob doesn't support "^": 

https://github.com/fsspec/filesystem_spec/blob/3e739db7e53f5b408319dcc9d11e92bc1f938902/fsspec/spec.py#L465-L479

> "my_dataset_dev" doesn't match your regex, "my_dataset_validation" doesn't either ... Why not always "train" unless specified?

And `my_dataset_dev.foo` would match the pattern, and we also have the same pattern but for the "validation" keyword so `my_dataset_validation.foo` would work too

> The regex is needed as part of our effort to make datasets configurable without code

This feels like coding with the filename ^^'

This is still much easier than having to write a full dataset script right ? :p
Issue: Bug downloading Virus scan warning page from Google Drive URLs
State: closed
Labels: name: bug

## Describe the bug
Recently, some issues were reported with URLs from Google Drive, where we were downloading the Virus scan warning page instead of the data file itself.

See:
- #3758 
- #3773
- #3784


Once the PR merged into master and until our next `datasets` library release, you can get this fix by installing our library from the GitHub master branch:
```shell
pip install git+https://github.com/huggingface/datasets#egg=datasets
```
Then, if you had previously tried to load the data and got the checksum error, you should force the redownload of the data (before the fix, you just downloaded and cached the virus scan warning page, instead of the data file):
```shell
load_dataset("...", download_mode="force_redownload")
```
Issue: Unable to Download CNN-Dailymail Dataset 
State: closed
Labels: name: bug

## Describe the bug
I am unable to download the CNN-Dailymail dataset. Upon closer investigation, I realised why this was happening:
- The dataset sits in Google Drive, and both the CNN and DM datasets are large.
- Google is unable to scan the folder for viruses, **so the link which would originally download the dataset, now downloads the source code of this web page:**
![image](https://user-images.githubusercontent.com/58678541/155658435-c2f497d7-7601-4332-94b1-18a62dd96422.png)
- **This leads to the following error**:
```python
NotADirectoryError: [Errno 20] Not a directory: '/root/.cache/huggingface/datasets/downloads/1bc05d24fa6dda2468e83a73cf6dc207226e01e3c48a507ea716dc0421da583b/cnn/stories'
```


## Steps to reproduce the bug
```python
import datasets
dataset = datasets.load_dataset("cnn_dailymail", "3.0.0", split="train")
```

## Expected results
That the dataset is downloaded and processed just like other datasets.

## Actual results
Hit with this error:
```python
NotADirectoryError: [Errno 20] Not a directory: '/root/.cache/huggingface/datasets/downloads/1bc05d24fa6dda2468e83a73cf6dc207226e01e3c48a507ea716dc0421da583b/cnn/stories'
```

## Environment info
<!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
- `datasets` version: 1.18.3
- Platform: Linux-5.4.144+-x86_64-with-Ubuntu-18.04-bionic
- Python version: 3.7.12
- PyArrow version: 6.0.1


#self-assign

@AngadSethi thanks for reporting and thanks for your PR!

Glad to help @albertvillanova! Just fine-tuning the PR, will comment once I am able to get it up and running 😀

Fixed by:
- #3787
Issue: Not be able to download dataset - "Newsroom"
State: closed
Labels: name: dataset bug

Hello,

I tried to download the **newsroom** dataset but it didn't work out for me. it said me to **download it manually**!

For manually, Link is also didn't work! It is sawing some ad or something!

If anybody has solved this issue please help me out or if somebody has this dataset please share your google drive link, it would be a great help!

Thanks
Darshan Tank

Hi @Darshan2104, thanks for reporting.

Please note that at Hugging Face we do not host the data of this dataset, but just a loading script pointing to the host of the data owners.

Apparently the data owners changed their data host server. After googling it, I found their new website at: https://lil.nlp.cornell.edu/newsroom/index.html
- Download page: https://lil.nlp.cornell.edu/newsroom/download/index.html

I'm fixing the link in our Datasets library.

@albertvillanova Thanks for the solution and link you made my day!
Issue: Allow download only some files from the Wikipedia dataset
State: open
Labels: name: enhancement

**Is your feature request related to a problem? Please describe.**
The Wikipedia dataset can be really big. This is a problem if you want to use it locally in a laptop with the Apache Beam `DirectRunner`. Even if your laptop have a considerable amount of memory (e.g. 32gb).


**Describe the solution you'd like**
I would like to use the `data_files` argument in the `load_dataset` function to define which file in the wikipedia dataset I would like to download. Thus, I can work with the dataset in a smaller machine using the Apache Beam `DirectRunner`.

**Describe alternatives you've considered**
I've tried to use the `simple` Wikipedia dataset. But it's in English and I would like to use Portuguese texts in my model. 


Hi @jvanz, thank you for your proposal.

In fact, we are aware that it is very common the problem you mention. Because of that, we are currently working in implementing a new version of wikipedia on the Hub, with all data preprocessed (no need to use Apache Beam), from where you will be able to use `data_files` to load only a specific subset of the data files.

See:
- #3401
Issue: DuplicatedKeysError on msr_sqa dataset
State: closed

### Describe the bug
Failure to generate dataset msr_sqa because of duplicate keys.

### Steps to reproduce the bug
```
from datasets import load_dataset
load_dataset("msr_sqa")
```
### Expected results
The examples keys should be unique.

**Actual results**
```
>>> load_dataset("msr_sqa")
Downloading:
6.72k/? [00:00<00:00, 148kB/s]
Downloading:
2.93k/? [00:00<00:00, 53.8kB/s]
Using custom data configuration default
Downloading and preparing dataset msr_sqa/default (download: 4.57 MiB, generated: 26.25 MiB, post-processed: Unknown size, total: 30.83 MiB) to /root/.cache/huggingface/datasets/msr_sqa/default/0.0.0/70b2a497bd3cc8fc960a3557d2bad1eac5edde824505e15c9c8ebe4c260fd4d1...
Downloading: 100%
4.80M/4.80M [00:00<00:00, 7.49MB/s]
---------------------------------------------------------------------------
DuplicatedKeysError                       Traceback (most recent call last)
[/usr/local/lib/python3.7/dist-packages/datasets/builder.py](https://localhost:8080/#) in _prepare_split(self, split_generator)
   1080                     example = self.info.features.encode_example(record)
-> 1081                     writer.write(example, key)
   1082             finally:

8 frames
DuplicatedKeysError: FAILURE TO GENERATE DATASET !
Found duplicate Key: nt-639
Keys should be unique and deterministic in nature

During handling of the above exception, another exception occurred:

DuplicatedKeysError                       Traceback (most recent call last)
[/usr/local/lib/python3.7/dist-packages/datasets/arrow_writer.py](https://localhost:8080/#) in check_duplicate_keys(self)
    449         for hash, key in self.hkey_record:
    450             if hash in tmp_record:
--> 451                 raise DuplicatedKeysError(key)
    452             else:
    453                 tmp_record.add(hash)

DuplicatedKeysError: FAILURE TO GENERATE DATASET !
Found duplicate Key: nt-639
Keys should be unique and deterministic in nature
```

### Environment info
datasets version: 1.18.3
Platform: Google colab notebook
Python version: 3.7
PyArrow version: 6.0.1


Thanks for reporting, @kolk.

We are fixing it.
Issue: `dataset = dataset.map()` causes faiss index lost
State: open
Labels: name: bug

## Describe the bug
assigning the resulted dataset to original dataset causes lost of the faiss index

## Steps to reproduce the bug
`my_dataset` is a regular loaded dataset. It's a part of a customed dataset structure
```python
self.dataset.add_faiss_index('embeddings')
self.dataset.list_indexes()
# ['embeddings']

dataset2 = my_dataset.map(
    lambda x: self._get_nearest_examples_batch(x['text']), batch=True
)

# the unexpected result:
dataset2.list_indexes()
# []

self.dataset.list_indexes()
# ['embeddings']
```

in case something wrong with my `_get_nearest_examples_batch()`, it's like this
```python
def _get_nearest_examples_batch(self, examples, k=5):
    queries = embed(examples)
    scores_batch, retrievals_batch = self.dataset.get_nearest_examples_batch(self.faiss_column, queries, k)
    return {
        'neighbors': [batch['text'] for batch in retrievals_batch],
        'scores': scores_batch
    }
```

## Expected results
`map` shouldn't drop the indexes, in another word, indexes should be carried to the generated dataset

## Actual results
map drops the indexes

## Environment info
<!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
- `datasets` version: 1.18.3
- Platform: Ubuntu 20.04.3 LTS
- Python version: 3.8.12
- PyArrow version: 7.0.0


Hi ! Indeed `map` is dropping the index right now, because one can create a dataset with more or fewer rows using `map` (and therefore the index might not be relevant anymore)

I guess we could check the resulting dataset length, and if the user hasn't changed the dataset size we could keep the index, what do you think ?

doing `.add_column("x",x_data)` also removes the index. the new column might be irrelevant to the index so I don't think it should drop. 

Minimal example

```python
from datasets import load_dataset
import numpy as np

data=load_dataset("ceyda/cats_vs_dogs_sample") #just a test dataset
data=data["train"]
embd_data=data.map(lambda x: {"emb":np.random.uniform(-1,0,50).astype(np.float32)})
embd_data.add_faiss_index(column="emb")
print(embd_data.list_indexes())
embd_data=embd_data.add_column("x",[0]*data.num_rows)
print(embd_data.list_indexes())
```

I agree `add_column` shouldn't drop the index indeed ! Is it something you'd like to contribute ? I think it's just a matter of copying the `self._indexes` dictionary to the output dataset
Issue: `Dataset.class_encode` should support custom class names
State: closed
Labels: name: enhancement

I can make a PR, just wanted approval before starting.

**Is your feature request related to a problem? Please describe.**

It is often the case that classes are not ordered in alphabetical order. Current `class_encode_column` sort the classes before indexing.
https://github.com/huggingface/datasets/blob/master/src/datasets/arrow_dataset.py#L1235

**Describe the solution you'd like**
I would like to add a **optional** parameter `class_names` to `class_encode_column` that would  be used for the mapping instead of sorting the unique values.

**Describe alternatives you've considered**

One can use map instead. I find it harder to read.
```python
CLASS_NAMES = ['apple', 'orange', 'potato']
ds = ds.map(lambda item: CLASS_NAMES.index(item[label_column]))

# Proposition
ds = ds.class_encode_column(label_column, CLASS_NAMES)
```

**Additional context**

I can make the PR if this feature is accepted.


Hi @Dref360, thanks a lot for your proposal.

It totally makes sense to have more flexibility when class encoding, I agree.

You could even further customize the class encoding by passing an instance of `ClassLabel` itself (instead of replicating `ClassLabel` instantiation arguments as `Dataset.class_encode_column` arguments).

And the latter made me think of `Dataset.cast_column`...

Maybe better to have some others' opinions @lhoestq @mariosasko 

Hi @Dref360! You can use [`Dataset.align_labels_with_mapping`](https://huggingface.co/docs/datasets/master/package_reference/main_classes.html#datasets.Dataset.align_labels_with_mapping) after `Dataset.class_encode_column` to assign a different mapping of labels to ids.

@albertvillanova I'd like to avoid adding more complexity to the API where it's not (absolutely) needed, so I don't think introducing a new param in `Dataset.class_encode_column` is a good idea.



I wasn't aware that it existed thank you for the link.

Closing then!
Issue: Know your data for HF hub 
State: closed
Labels: name: enhancement

**Is your feature request related to a problem? Please describe.**
Would be great to see be able to understand datasets with the goal of improving data quality, and helping mitigate fairness and bias issues.

**Describe the solution you'd like**
Something like https://knowyourdata.withgoogle.com/ for HF hub

Hi @Muhtasham you should take a look at https://huggingface.co/blog/data-measurements-tool and accompanying demo app at https://huggingface.co/spaces/huggingface/data-measurements-tool

We would be interested in your feedback. cc @meg-huggingface @sashavor @yjernite
Issue: Unable to view the Gradio flagged call back dataset
State: closed
Labels: name: dataset-viewer

## Dataset viewer issue for '*savtadepth-flags*'

**Link:** *[savtadepth-flags](https://huggingface.co/datasets/kingabzpro/savtadepth-flags)*

*with the Gradio 2.8.1 the dataset viers stopped working. I tried to add values manually but its not working. The dataset is also not showing the link with the app https://huggingface.co/spaces/kingabzpro/savtadepth.*

Am I the one who added this dataset ? Yes


Hi @kingabzpro.

I think you need to create a loading script that creates the dataset from the CSV file and the image paths.

As example, you could have a look at the Food-101 dataset: https://huggingface.co/datasets/food101
- Loading script: https://huggingface.co/datasets/food101/blob/main/food101.py

Once the loading script is created, the viewer will show a previsualization of your dataset. 

@albertvillanova I don't think this is the issue. I have created another dataset with similar files and format and it works. https://huggingface.co/datasets/kingabzpro/savtadepth-flags-V2

Yes, you are right, that was not the issue.

Just take into account that sometimes the viewer can take some time until it shows the preview of the dataset.
After some time, yours is finally properly shown: https://huggingface.co/datasets/kingabzpro/savtadepth-flags

The problem was resolved by deleted the dataset and creating new one with similar name and then clicking on flag button.

I think if you make manual changes to dataset the whole system breaks.
Issue: head_qa file missing
State: closed
Labels: name: bug

## Describe the bug

A file for the `head_qa` dataset is missing (https://drive.google.com/u/0/uc?export=download&id=1a_95N5zQQoUCq8IBNVZgziHbeM-QxG2t/HEAD_EN/train_HEAD_EN.json)

## Steps to reproduce the bug
```python
>>> from datasets import load_dataset
>>> load_dataset("head_qa", name="en")
```

## Expected results

The dataset should be loaded

## Actual results

```
Downloading and preparing dataset head_qa/en (download: 75.69 MiB, generated: 2.69 MiB, post-processed: Unknown size, total: 78.38 MiB) to /home/slesage/.cache/huggingface/datasets/head_qa/en/1.1.0/583ab408e8baf54aab378c93715fadc4d8aa51b393e27c3484a877e2ac0278e9...
Downloading data: 2.21kB [00:00, 2.05MB/s]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/slesage/hf/datasets-preview-backend/.venv/lib/python3.9/site-packages/datasets/load.py", line 1729, in load_dataset
    builder_instance.download_and_prepare(
  File "/home/slesage/hf/datasets-preview-backend/.venv/lib/python3.9/site-packages/datasets/builder.py", line 594, in download_and_prepare
    self._download_and_prepare(
  File "/home/slesage/hf/datasets-preview-backend/.venv/lib/python3.9/site-packages/datasets/builder.py", line 665, in _download_and_prepare
    verify_checksums(
  File "/home/slesage/hf/datasets-preview-backend/.venv/lib/python3.9/site-packages/datasets/utils/info_utils.py", line 40, in verify_checksums
    raise NonMatchingChecksumError(error_msg + str(bad_urls))
datasets.utils.info_utils.NonMatchingChecksumError: Checksums didn't match for dataset source files:
['https://drive.google.com/u/0/uc?export=download&id=1a_95N5zQQoUCq8IBNVZgziHbeM-QxG2t']
```

## Environment info
- `datasets` version: 1.18.4.dev0
- Platform: Linux-5.11.0-1028-aws-x86_64-with-glibc2.31
- Python version: 3.9.6
- PyArrow version: 6.0.1


We usually find issues with files hosted at Google Drive...

In this case we download the Google Drive Virus scan warning instead of the data file.

Fixed: https://huggingface.co/datasets/head_qa/viewer/en/train. Thanks

<img width="1551" alt="Capture d’écran 2022-02-28 à 15 29 04" src="https://user-images.githubusercontent.com/1676121/156000224-fd3f62c6-8b54-4df1-8911-bdcb0bac3f1a.png">