attempt to restructure this

nba_tracking_data_15_16.py

@@ -80,6 +80,7 @@ class NbaTracking(datasets.GeneratorBasedBuilder):
     """Tracking data for all games of 2015-2016 season in forms of coordinates for players and ball at each moment."""
 
     items = ITEMS
+    _PBP_URL = _PBP_URL
     
     BUILDER_CONFIG_CLASS = NbaTrackingConfig
 
@@ -189,7 +190,7 @@ class NbaTracking(datasets.GeneratorBasedBuilder):
 
     def _split_generators(self, dl_manager):
         random.seed(9)
-        items = random.sample(items, self.config.samples)
+        items = random.sample(self.items, self.config.samples)
         
         _URLS = {}
         for game in items:
@@ -197,7 +198,6 @@ class NbaTracking(datasets.GeneratorBasedBuilder):
           _URLS[name] = _URL + "/" + name + ".7z"
             
         _URLS = _URLS
-        _PBP_URL = _PBP_URL
         
         urls = self._URLS
         data_dir = dl_manager.download_and_extract(urls)