Added NER Support for Yoruba

[paula813]

NER Support for Yoruba (Introduction task for NLP lecture)

[alanakbik]

Hello @paula813 running the following code:

from flair.datasets import YORUBA_NER

corpus = YORUBA_NER()

Throws the following error:

Traceback (most recent call last):
  File "/home/alan/PycharmProjects/flair/local_load_datasets.py", line 10, in <module>
    corpus = YORUBA_NER()
  File "/home/alan/PycharmProjects/flair/flair/datasets/sequence_labeling.py", line 1632, in __init__
    cached_path(f"{yoruba_path}test.txt", Path("datasets") / dataset_name)
  File "/home/alan/PycharmProjects/flair/flair/file_utils.py", line 91, in cached_path
    return get_from_cache(url_or_filename, dataset_cache)
  File "/home/alan/PycharmProjects/flair/flair/file_utils.py", line 220, in get_from_cache
    f"HEAD request failed for url {url} with status code {response.status_code}."
OSError: HEAD request failed for url https://github.com/masakhane-io/masakhane-ner/tree/main/data/yortest.txt with status code 404.

I think the yoruba_path variable is wrong or missing a slash.

[alanakbik]

Fix download bug

[paula813]

Thanks for the information, I fixed the URL.

[alanakbik]

The URL is fixed, but the code still does not run:

from flair.datasets import YORUBA_NER

corpus = YORUBA_NER()

You can check #2227 for a related PR that works. (And please test your code before putting in a PR.)

[paula813]

I tested it and I think training a model works now. Only after the training is finished it says:
Process finished with exit code 139 (interrupted by signal 11: SIGSEGV)
But I do not have any idea why that happens?

[alanakbik]

@paula813 thanks, not sure about the error but the dataset seems to work now!