Script fixes

rulm.py

@@ -62,7 +62,11 @@ class RuLMDataset(datasets.GeneratorBasedBuilder):
     def _info(self):
         features = datasets.Features(
             {
-                _TEXT: datasets.Value("string")
+                "text": datasets.Value("string"),
+                "meta": {
+                    "source": datasets.Value("string"),
+                    "url": datasets.Value("string")
+                }
             }
         )
         return datasets.DatasetInfo(
@@ -88,4 +92,4 @@ class RuLMDataset(datasets.GeneratorBasedBuilder):
                 reader_stream = io.BufferedReader(cctx.stream_reader(f))
                 reader = jsonlines.Reader(reader_stream, loads=parse_json)
                 for id_, item in enumerate(reader):
-                    yield id_, {"text": item["text"]}
+                    yield id_, item