Update Pile-subset.py

Pile-subset.py

@@ -195,7 +195,7 @@ class ThePile(datasets.GeneratorBasedBuilder):
                 datasets.SplitGenerator(
                     name=split,
                     gen_kwargs={
-                        "files": data_dir[split],
+                        "files": data_dir,
                     },
                 )
                 for split in [datasets.Split.TRAIN, datasets.Split.VALIDATION, datasets.Split.TEST]