Optimize downloading (#9)

- Optimize downloading (a7c0106af07122b2e780761e87b9c54fa763c56f)

P3.py

@@ -151,15 +151,14 @@ class P3(datasets.GeneratorBasedBuilder):
 
     def _split_generators(self, dl_manager):
         split_generators = []
-        data_dir = dl_manager.download_and_extract(_URLs)
-        task_name = self.config.name
+        data_dir = dl_manager.download(_URLs[self.config.name])
         if "train" in self.config.splits:
             split_name = "train"
             split_generators.append(
                 datasets.SplitGenerator(
                     name=datasets.Split.TRAIN,
                     gen_kwargs={
-                        "tfrecord": data_dir[task_name][split_name][0],
+                        "tfrecord": data_dir[split_name][0],
                     }
                 )
             )
@@ -169,7 +168,7 @@ class P3(datasets.GeneratorBasedBuilder):
                 datasets.SplitGenerator(
                     name=datasets.Split.VALIDATION,
                     gen_kwargs={
-                        "tfrecord": data_dir[task_name][split_name][0],
+                        "tfrecord": data_dir[split_name][0],
                     }
                 )
             )
@@ -179,7 +178,7 @@ class P3(datasets.GeneratorBasedBuilder):
                 datasets.SplitGenerator(
                     name=datasets.Split.TEST,
                     gen_kwargs={
-                        "tfrecord": data_dir[task_name][split_name][0],
+                        "tfrecord": data_dir[split_name][0],
                     }
                 )
             )
@@ -190,7 +189,7 @@ class P3(datasets.GeneratorBasedBuilder):
                 datasets.SplitGenerator(
                     name=datasets.Split(special_split_name),
                     gen_kwargs={
-                        "tfrecord": data_dir[task_name][special_split_name][0],
+                        "tfrecord": data_dir[special_split_name][0],
                     }
                 )
             )