fix dataset loading in streaming mode

frwiki_el.py

@@ -176,9 +176,6 @@ class FrwikiElDataset(datasets.GeneratorBasedBuilder):
         # TODO: This method is tasked with downloading/extracting the data and defining the splits depending on the configuration
         # If several configurations are possible (listed in BUILDER_CONFIGS), the configuration selected by the user is in self.config.name
 
-        # dl_manager is a datasets.download.DownloadManager that can be used to download and extract URLs
-        # It can accept any type or nested list/dict and will give back the same structure with the url replaced with path to local files.
-        # By default the archives will be extracted and a path to a cached folder where they are extracted is returned instead of the archive
         filepath = _URLs[self.config.name]
         path = dl_manager.download(filepath)
         return [
@@ -196,13 +193,12 @@ class FrwikiElDataset(datasets.GeneratorBasedBuilder):
         # This method handles input defined in _split_generators to yield (key, example) tuples from the dataset.
         # The `key` is here for legacy reason (tfds) and is not important in itself.
 
-        # entities_path = Path(data_dir, "entities.jsonl.gz")
-        # corpus_path = Path(data_dir, "corpus.jsonl.gz")
-
         def _identiy(x):
             return x
 
-        with gzip.open(path, "rt", encoding="UTF-8") as crps_file:
-            for id, line in enumerate(crps_file):
+        # We need to use open before gzip.open in case the dataset is streamed
+        # https://github.com/huggingface/datasets/issues/2607#issuecomment-883219727
+        with gzip.open(open(path, 'rb'), "rt", encoding="UTF-8") as datafile:
+            for id, line in enumerate(datafile):
                 item = json.loads(line, parse_int=_identiy, parse_float=_identiy, parse_constant=_identiy)
                 yield id, item