use CC-Matrix citation for CCMatrix data

nllb.py

@@ -23,7 +23,7 @@ version from statmt.org, or the new one from AllenAI.
 import datasets
 import typing as tp
 
-_CITATION = (
+NLLB_CITATION = (
     "@article{team2022NoLL,"
     "title={No Language Left Behind: Scaling Human-Centered Machine Translation},"
     r"author={Nllb team and Marta Ruiz Costa-juss{\`a} and James Cross and Onur Celebi and Maha Elbayad and Kenneth Heafield and Kevin Heffernan and Elahe Kalbassi and Janice Lam and Daniel Licht and Jean Maillard and Anna Sun and Skyler Wang and Guillaume Wenzek and Alison Youngblood and Bapi Akula and Lo{\"i}c Barrault and Gabriel Mejia Gonzalez and Prangthip Hansanti and John Hoffman and Semarley Jarrett and Kaushik Ram Sadagopan and Dirk Rowe and Shannon L. Spruit and C. Tran and Pierre Andrews and Necip Fazil Ayan and Shruti Bhosale and Sergey Edunov and Angela Fan and Cynthia Gao and Vedanuj Goswami and Francisco Guzm'an and Philipp Koehn and Alexandre Mourachko and Christophe Ropers and Safiyyah Saleem and Holger Schwenk and Jeff Wang},"
@@ -33,6 +33,15 @@ _CITATION = (
     "}"
 )
 
+CCMATRIX_CITATION = (
+    "@inproceedings{schwenk2021ccmatrix,"
+    "title={CCMatrix: Mining Billions of High-Quality Parallel Sentences on the Web},"
+    "author={Schwenk, Holger and Wenzek, Guillaume and Edunov, Sergey and Grave, {'E}douard and Joulin, Armand and Fan, Angela},"
+    "booktitle={Proceedings of the 59th Annual Meeting of the Association for Computational Linguistics and the 11th International Joint Conference on Natural Language Processing (Volume 1: Long Papers)},"
+    "pages={6490--6500},"
+    "year={2021}"
+)
+
 
 _DESCRIPTION = ""  # TODO
 
@@ -77,7 +86,7 @@ def _builder_configs() -> tp.List[NLLBTaskConfig]:
             src_lg=src_lg,
             tgt_lg=tgt_lg,
             # Use CCMatrix language code to fetch from statmt
-            url = f"{_STATMT_URL}{src}-{tgt}.bitextf.tsv.gz"
+            url=f"{_STATMT_URL}{src}-{tgt}.bitextf.tsv.gz",
         )
 
     for (src_lg, tgt_lg) in _LANGUAGE_PAIRS:
@@ -87,7 +96,7 @@ def _builder_configs() -> tp.List[NLLBTaskConfig]:
             description=f"No Language Left Behind (NLLB): {src_lg} - {tgt_lg}",
             src_lg=src_lg,
             tgt_lg=tgt_lg,
-            url = f"{_ALLENAI_URL}{src_lg}-{tgt_lg}.gz"
+            url=f"{_ALLENAI_URL}{src_lg}-{tgt_lg}.gz",
         )
     return list(configs.values())
 
@@ -100,6 +109,7 @@ class NLLB(datasets.GeneratorBasedBuilder):
 
     def _info(self):
         # define feature types
+        citation = NLLB_CITATION
         features = datasets.Features(
             {
                 "translation": datasets.Translation(
@@ -115,6 +125,7 @@ class NLLB(datasets.GeneratorBasedBuilder):
             }
         )
         if self.config.source == "statmt":
+            citation = CCMATRIX_CITATION
             # MT stats didn't published all the metadata
             features = datasets.Features(
                 {
@@ -131,7 +142,7 @@ class NLLB(datasets.GeneratorBasedBuilder):
             supervised_keys=None,
             homepage=_HOMEPAGE,
             license=_LICENSE,
-            citation=_CITATION,
+            citation=citation,
         )
 
     def _split_generators(self, dl_manager):