fix: Add MalteseNewsClassification (#546)

* MalteseNewsClassification added

* lint fixes

* MalteseNewsClassification as multilabel + WIP stratification added

* results for multilabel classfication updated

* Maltese MultiLabelClassification added

---------

Co-authored-by: Isaac Chung <chungisaac1217@gmail.com>

docs/mmteb/points/546.jsonl

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+{"GitHub": "dokato", "New dataset": 2}
+{"GitHub": "isaac-chung", "Review PR": 2}

mteb/tasks/MultiLabelClassification/mlt/MalteseNewsClassification.py

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+from __future__ import annotations
+
+from mteb.abstasks import AbsTaskMultilabelClassification
+from mteb.abstasks.TaskMetadata import TaskMetadata
+
+
+class MalteseNewsClassification(AbsTaskMultilabelClassification):
+    metadata = TaskMetadata(
+        name="MalteseNewsClassification",
+        description="""A multi-label topic classification dataset for Maltese News
+        Articles. The data was collected from the press_mt subset from Korpus
+        Malti v4.0. Article contents were cleaned to filter out JavaScript, CSS,
+        & repeated non-Maltese sub-headings. The labels are based on the category
+        field from this corpus. 
+        """,
+        reference="https://huggingface.co/datasets/MLRS/maltese_news_categories",
+        dataset={
+            "path": "MLRS/maltese_news_categories",
+            "revision": "6bb0321659c4f07c4c2176c30c98c971be6571b4",
+        },
+        type="Classification",
+        category="s2s",
+        eval_splits=["test"],
+        eval_langs=["mlt-Latn"],
+        main_score="accuracy",
+        date=("2023-10-21", "2024-04-24"),
+        form=["written"],
+        domains=["Constructed"],
+        task_subtypes=["Topic classification"],
+        license="cc-by-nc-sa-4.0",
+        socioeconomic_status="high",
+        annotations_creators="expert-annotated",
+        dialect=[],
+        text_creation="found",
+        bibtex_citation="""@inproceedings{maltese-news-datasets,
+            title = "Topic Classification and Headline Generation for {M}altese using a Public News Corpus",
+            author = "Chaudhary, Amit Kumar  and
+                    Micallef, Kurt  and
+                    Borg, Claudia",
+            booktitle = "Proceedings of the 2024 Joint International Conference on Computational Linguistics, Language Resources and Evaluation",
+            month = may,
+            year = "2024",
+            publisher = "Association for Computational Linguistics",
+        }""",
+        n_samples={"train": 10784, "test": 2297},
+        avg_character_length={"train": 1595.63, "test": 1752.1},
+    )
+
+    def dataset_transform(self):
+        # 80% of categories have just one label, so it's safe to take the first
+        self.dataset = self.dataset.rename_columns({"labels": "label"})
+        remove_cols = [
+            col
+            for col in self.dataset["test"].column_names
+            if col not in ["text", "label"]
+        ]
+        self.dataset = self.dataset.remove_columns(remove_cols)

results/intfloat__multilingual-e5-small/MalteseNewsClassification.json

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+{
+  "dataset_revision": "6bb0321659c4f07c4c2176c30c98c971be6571b4",
+  "mteb_dataset_name": "MalteseNewsClassification",
+  "mteb_version": "1.6.37",
+  "test": {
+    "accuracy": 0.2266869830213322,
+    "accuracy_stderr": 0.02263575385876514,
+    "evaluation_time": 161.74,
+    "f1": 0.2281811500943983,
+    "f1_stderr": 0.019025670776051662,
+    "lrap": 0.3279256333210852,
+    "lrap_stderr": 0.03015123586760265,
+    "main_score": 0.2266869830213322
+  }
+}

results/sentence-transformers__paraphrase-multilingual-MiniLM-L12-v2/MalteseNewsClassification.json

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+{
+  "dataset_revision": "6bb0321659c4f07c4c2176c30c98c971be6571b4",
+  "mteb_dataset_name": "MalteseNewsClassification",
+  "mteb_version": "1.6.37",
+  "test": {
+    "accuracy": 0.07885117493472585,
+    "accuracy_stderr": 0.017705011126129034,
+    "evaluation_time": 20.53,
+    "f1": 0.07009299109901666,
+    "f1_stderr": 0.014374488952030922,
+    "lrap": 0.15509671666752245,
+    "lrap_stderr": 0.01950650468106085,
+    "main_score": 0.07885117493472585
+  }
+}