trying new features.sequence structure?

nba_tracking_data_15_16.py

@@ -66,7 +66,7 @@ class NbaTracking(datasets.GeneratorBasedBuilder):
                     "name": datasets.Value("string"),
                     "teamid": datasets.Value("int64"),
                     "abbreviation": datasets.Value("string"),
-                    "players": datasets.Sequence({
+                    "players": datasets.features.Sequence({
                         "lastname": datasets.Value("string"),
                         "firstname": datasets.Value("string"),
                         "playerid": datasets.Value("int64"),