Pubmed dataset not reachable
MEMBER
Hi @abhi-mosaic, thanks for reporting.

I'm looking at it... 
2022-02-09T08:38:36Z
https://github.com/huggingface/datasets/issues/3655#issuecomment-1033494164
https://api.github.com/repos/huggingface/datasets/issues/3655
IC_kwDODunzps49md6U
https://api.github.com/repos/huggingface/datasets/issues/comments/1033494164/reactions
2022-02-09T08:38:36Z
https://api.github.com/repos/huggingface/datasets/issues/comments/1033494164
https://avatars.githubusercontent.com/u/8515462?v=4
https://api.github.com/users/albertvillanova/events{/privacy}
https://api.github.com/users/albertvillanova/followers
https://api.github.com/users/albertvillanova/following{/other_user}
https://api.github.com/users/albertvillanova/gists{/gist_id}
https://github.com/albertvillanova
albertvillanova
MDQ6VXNlcjg1MTU0NjI=
https://api.github.com/users/albertvillanova/orgs
https://api.github.com/users/albertvillanova/received_events
https://api.github.com/users/albertvillanova/repos
https://api.github.com/users/albertvillanova/starred{/owner}{/repo}
https://api.github.com/users/albertvillanova/subscriptions
User
https://api.github.com/users/albertvillanova
public
NONE
also hitting this issue
2022-02-11T15:54:06Z
https://github.com/huggingface/datasets/issues/3655#issuecomment-1036356695
https://api.github.com/repos/huggingface/datasets/issues/3655
IC_kwDODunzps49xYxX
https://api.github.com/repos/huggingface/datasets/issues/comments/1036356695/reactions
2022-02-11T15:54:06Z
https://api.github.com/repos/huggingface/datasets/issues/comments/1036356695
https://avatars.githubusercontent.com/u/3495140?v=4
https://api.github.com/users/mprorock/events{/privacy}
https://api.github.com/users/mprorock/followers
https://api.github.com/users/mprorock/following{/other_user}
https://api.github.com/users/mprorock/gists{/gist_id}
https://github.com/mprorock
mprorock
MDQ6VXNlcjM0OTUxNDA=
https://api.github.com/users/mprorock/orgs
https://api.github.com/users/mprorock/received_events
https://api.github.com/users/mprorock/repos
https://api.github.com/users/mprorock/starred{/owner}{/repo}
https://api.github.com/users/mprorock/subscriptions
User
https://api.github.com/users/mprorock
public
CONTRIBUTOR
Hey @albertvillanova, sorry to reopen this... I can confirm that on `master` branch the dataset is downloadable now but it is still broken in streaming mode:

```python
 >>> import datasets
 >>> pubmed_train = datasets.load_dataset('pubmed', split='train', streaming=True)
 >>> next(iter(pubmed_train))
```
```
 No such file or directory: 'gzip://pubmed22n0001.xml::ftp://ftp.ncbi.nlm.nih.gov/pubmed/baseline/pubmed22n0001.xml.gz'
```

2022-02-15T18:23:34Z
https://github.com/huggingface/datasets/issues/3655#issuecomment-1040623728
https://api.github.com/repos/huggingface/datasets/issues/3655
IC_kwDODunzps4-Bqhw
https://api.github.com/repos/huggingface/datasets/issues/comments/1040623728/reactions
2022-02-15T18:23:34Z
https://api.github.com/repos/huggingface/datasets/issues/comments/1040623728
https://avatars.githubusercontent.com/u/77638579?v=4
https://api.github.com/users/abhi-mosaic/events{/privacy}
https://api.github.com/users/abhi-mosaic/followers
https://api.github.com/users/abhi-mosaic/following{/other_user}
https://api.github.com/users/abhi-mosaic/gists{/gist_id}
https://github.com/abhi-mosaic
abhi-mosaic
MDQ6VXNlcjc3NjM4NTc5
https://api.github.com/users/abhi-mosaic/orgs
https://api.github.com/users/abhi-mosaic/received_events
https://api.github.com/users/abhi-mosaic/repos
https://api.github.com/users/abhi-mosaic/starred{/owner}{/repo}
https://api.github.com/users/abhi-mosaic/subscriptions
User
https://api.github.com/users/abhi-mosaic
public
MEMBER
Hi @abhi-mosaic, would you mind opening another issue for this new problem?

First issue (already solved) was a ConnectionError due to the yearly update release of PubMed: we fixed it by updating the URLs from year 2021 to year 2022.

However this is another problem: to make pubmed streamable. Please note that NOT all our datastes are streamable: we are making streamable more and more of them... but this is an on-going process...

Thanks.
2022-02-16T09:08:17Z
https://github.com/huggingface/datasets/issues/3655#issuecomment-1041268408
https://api.github.com/repos/huggingface/datasets/issues/3655
IC_kwDODunzps4-EH64
https://api.github.com/repos/huggingface/datasets/issues/comments/1041268408/reactions
2022-02-16T09:08:17Z
https://api.github.com/repos/huggingface/datasets/issues/comments/1041268408
https://avatars.githubusercontent.com/u/8515462?v=4
https://api.github.com/users/albertvillanova/events{/privacy}
https://api.github.com/users/albertvillanova/followers
https://api.github.com/users/albertvillanova/following{/other_user}
https://api.github.com/users/albertvillanova/gists{/gist_id}
https://github.com/albertvillanova
albertvillanova
MDQ6VXNlcjg1MTU0NjI=
https://api.github.com/users/albertvillanova/orgs
https://api.github.com/users/albertvillanova/received_events
https://api.github.com/users/albertvillanova/repos
https://api.github.com/users/albertvillanova/starred{/owner}{/repo}
https://api.github.com/users/albertvillanova/subscriptions
User
https://api.github.com/users/albertvillanova
public
NONE
@albertvillanova 
When I tried below codes, I got the similar error

```

dataset=load_dataset("pubmed",split="train")

Couldn't reach ftp://ftp.ncbi.nlm.nih.gov/pubmed/baseline/pubmed21n0601.xml.gz
```
2022-07-21T05:22:50Z
https://github.com/huggingface/datasets/issues/3655#issuecomment-1191052176
https://api.github.com/repos/huggingface/datasets/issues/3655
IC_kwDODunzps5G_gOQ
https://api.github.com/repos/huggingface/datasets/issues/comments/1191052176/reactions
2022-07-21T05:24:12Z
https://api.github.com/repos/huggingface/datasets/issues/comments/1191052176
https://avatars.githubusercontent.com/u/4935800?v=4
https://api.github.com/users/y-rok/events{/privacy}
https://api.github.com/users/y-rok/followers
https://api.github.com/users/y-rok/following{/other_user}
https://api.github.com/users/y-rok/gists{/gist_id}
https://github.com/y-rok
y-rok
MDQ6VXNlcjQ5MzU4MDA=
https://api.github.com/users/y-rok/orgs
https://api.github.com/users/y-rok/received_events
https://api.github.com/users/y-rok/repos
https://api.github.com/users/y-rok/starred{/owner}{/repo}
https://api.github.com/users/y-rok/subscriptions
User
https://api.github.com/users/y-rok
public
MEMBER
@y-rok you need to update `datasets`:
```shell
pip install -U datasets
```
2022-12-19T19:18:09Z
https://github.com/huggingface/datasets/issues/3655#issuecomment-1358141755
https://api.github.com/repos/huggingface/datasets/issues/3655
IC_kwDODunzps5Q85k7
https://api.github.com/repos/huggingface/datasets/issues/comments/1358141755/reactions
2022-12-19T19:18:09Z
https://api.github.com/repos/huggingface/datasets/issues/comments/1358141755
https://avatars.githubusercontent.com/u/8515462?v=4
https://api.github.com/users/albertvillanova/events{/privacy}
https://api.github.com/users/albertvillanova/followers
https://api.github.com/users/albertvillanova/following{/other_user}
https://api.github.com/users/albertvillanova/gists{/gist_id}
https://github.com/albertvillanova
albertvillanova
MDQ6VXNlcjg1MTU0NjI=
https://api.github.com/users/albertvillanova/orgs
https://api.github.com/users/albertvillanova/received_events
https://api.github.com/users/albertvillanova/repos
https://api.github.com/users/albertvillanova/starred{/owner}{/repo}
https://api.github.com/users/albertvillanova/subscriptions
User
https://api.github.com/users/albertvillanova
public
## Describe the bug
Trying to use the `pubmed` dataset fails to reach / download the source files.

## Steps to reproduce the bug
```python
pubmed_train = datasets.load_dataset('pubmed', split='train')
```

## Expected results
Should begin downloading the pubmed dataset.

## Actual results
```
ConnectionError: Couldn't reach ftp://ftp.ncbi.nlm.nih.gov/pubmed/baseline/pubmed21n0865.xml.gz (InvalidSchema("No connection adapters were found for 'ftp://ftp.ncbi.nlm.nih.gov/pubmed/baseline/pubmed21n0865.xml.gz'"))
```

## Environment info
- `datasets` version: 1.18.2
- Platform: macOS-11.4-x86_64-i386-64bit
- Python version: 3.8.2
- PyArrow version: 6.0.0
