MalteseNewsClassification added

[dokato]

Maltese news classification dataset: https://huggingface.co/datasets/MLRS/maltese_news_categories

As suggested here: #419

Checklist for adding MMTEB dataset

Reason for dataset addition:

• I have tested that the dataset runs with the mteb package.
• I have run the following models on the task (adding the results to the pr). These can be run using the mteb run -m {model_name} -t {task_name} command.
  • sentence-transformers/paraphrase-multilingual-MiniLM-L12-v2
  • intfloat/multilingual-e5-small
• I have checked that the performance is neither trivial (both models gain close to perfect scores) nor random (both models gain close to random scores).
• If the dataset is too big (e.g. >2048 examples), considering using self.stratified_subsampling() under dataset_transform()
• I have filled out the metadata object in the dataset file (find documentation on it here).
• Run tests locally to make sure nothing is broken using make test.
• Run the formatter to format the code using make lint.
• I have added points for my submission to the points folder using the PR number as the filename (e.g. 438.jsonl).

[isaac-chung]

This is a multilabel dataset. Let's keep it that way, and wait for #440 to merge before proceeding. Metadata looks good otherwise, and still requires linting.

[dokato]

Yup, that makes, sense, thanks @isaac-chung , I'll keep an eye on this pr!

[isaac-chung]

It's merged :)

[dokato]

thanks @isaac-chung , yeah I saw, but as this is quite big, we're still trying to figure how to do stratified sampling for multilabel problem, see: #698
I proposed here my take on that, until I'll get a green light or alternative, let's keep it WIP.

[x-tabdeveloping]

@dokato Let's keep this in a separate PR so we can discuss the two things on different threads (this task and then stratified subsampling). It should also be fine considering that a) all of these models will be rerun anyway b) we already have a function that does this, maybe faulty, but the interface already exists and we can swap it out anytime

[dokato]

K, done that! Created new PR in #760

This should be ready @isaac-chung. I "unwiped" it.

[isaac-chung]

Looks good, thanks for adding this!