Generate all language pairs

europarl_bilingual.py

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-
+import itertools
 import os
 import xml.etree.ElementTree as ET
 
@@ -96,10 +96,7 @@ LANGUAGES = [
     "sv",
 ]
 
-ALL_PAIRS = []
-for i in range(len(LANGUAGES)):
-    for j in range(i + 1, len(LANGUAGES)):
-        ALL_PAIRS.append((LANGUAGES[i], LANGUAGES[j]))
+LANGUAGE_PAIRS = itertools.combinations(LANGUAGES, 2)
 
 _VERSION = "8.0.0"
 _BASE_URL_DATASET = "https://object.pouta.csc.fi/OPUS-Europarl/v8/raw/{}.zip"
@@ -122,7 +119,7 @@ class EuroparlBilingualConfig(datasets.BuilderConfig):
         return (self.lang1, self.lang2)
 
     def _is_valid(self):
-        return self._lang_pair() in ALL_PAIRS
+        return self._lang_pair() in LANGUAGE_PAIRS
 
 
 class EuroparlBilingual(datasets.GeneratorBasedBuilder):
@@ -133,7 +130,7 @@ class EuroparlBilingual(datasets.GeneratorBasedBuilder):
     BUILDER_CONFIG_CLASS = EuroparlBilingualConfig
     BUILDER_CONFIGS = [
         EuroparlBilingualConfig(lang1=lang1, lang2=lang2, version=datasets.Version(_VERSION))
-        for lang1, lang2 in ALL_PAIRS[:5]
+        for lang1, lang2 in LANGUAGE_PAIRS
     ]
 
     def _info(self):
@@ -157,7 +154,9 @@ class EuroparlBilingual(datasets.GeneratorBasedBuilder):
         """Returns SplitGenerators."""
 
         if not self.config._is_valid():
-            raise ValueError(f"{self.config._lang_pair()} is not a supported language pair. Choose among: {ALL_PAIRS}")
+            raise ValueError(
+                f"{self.config._lang_pair()} is not a supported language pair. Choose among: {LANGUAGE_PAIRS}"
+            )
 
         # download data files
         path_datafile_1 = dl_manager.download_and_extract(_BASE_URL_DATASET.format(self.config.lang1))