Fix DuplicatedKeysError while loading multiple corpora

large_spanish_corpus.py

@@ -113,9 +113,9 @@ class LargeSpanishCorpus(datasets.GeneratorBasedBuilder):
         return [datasets.SplitGenerator(name=datasets.Split.TRAIN, gen_kwargs={"data_dir": data_dir})]
 
     def _generate_examples(self, data_dir):
+        _id = 0
         for filepath in self.config.filepaths:
             filepath = os.path.join(data_dir, filepath)
-            _id = 0
             with open(filepath, mode="r", encoding="utf-8") as f:
                 for line in f:
                     yield _id, {"text": line.strip()},