librispeech dataset has to download whole subset when specifing the split to use
{'login': 'sunhaozhepy', 'id': 73462159, 'node_id': 'MDQ6VXNlcjczNDYyMTU5', 'avatar_url': 'https://avatars.githubusercontent.com/u/73462159?v=4', 'gravatar_id': '', 'url': 'https://api.github.com/users/sunhaozhepy', 'html_url': 'https://github.com/sunhaozhepy', 'followers_url': 'https://api.github.com/users/sunhaozhepy/followers', 'following_url': 'https://api.github.com/users/sunhaozhepy/following{/other_user}', 'gists_url': 'https://api.github.com/users/sunhaozhepy/gists{/gist_id}', 'starred_url': 'https://api.github.com/users/sunhaozhepy/starred{/owner}{/repo}', 'subscriptions_url': 'https://api.github.com/users/sunhaozhepy/subscriptions', 'organizations_url': 'https://api.github.com/users/sunhaozhepy/orgs', 'repos_url': 'https://api.github.com/users/sunhaozhepy/repos', 'events_url': 'https://api.github.com/users/sunhaozhepy/events{/privacy}', 'received_events_url': 'https://api.github.com/users/sunhaozhepy/received_events', 'type': 'User', 'site_admin': False}
[{'id': 1935892857, 'node_id': 'MDU6TGFiZWwxOTM1ODkyODU3', 'url': 'https://api.github.com/repos/huggingface/datasets/labels/bug', 'name': 'bug', 'color': 'd73a4a', 'default': True, 'description': "Something isn't working"}]
[]
Hi! You can use streaming to fetch only a subset of the data:
```python
raw_dataset = load_dataset("librispeech_asr", "clean", split="train.100", streaming=True)
```
Also, we plan to make it possible to download a particular split in the non-streaming mode, but this task is not easy due to how our dataset scripts are structured. Hi,

That's a great help. Thank you very much.
## Describe the bug
librispeech dataset has to download whole subset when specifing the split to use

## Steps to reproduce the bug
see below
# Sample code to reproduce the bug
```
!pip install datasets
from datasets import load_dataset
raw_dataset = load_dataset("librispeech_asr", "clean", split="train.100")
```

## Expected results
The split "train.clean.100" is downloaded.

## Actual results
All four splits in "clean" subset is downloaded.

## Environment info
- `datasets` version: 2.3.2
- Platform: Linux-5.4.188+-x86_64-with-Ubuntu-18.04-bionic
- Python version: 3.7.13
- PyArrow version: 6.0.1
- Pandas version: 1.3.5

{'url': 'https://api.github.com/repos/huggingface/datasets/issues/4609/reactions', 'total_count': 0, '+1': 0, '-1': 0, 'laugh': 0, 'hooray': 0, 'confused': 0, 'heart': 0, 'rocket': 0, 'eyes': 0}