move imports into builder class

ChessBot-Dataset.py

@@ -1,4 +1,3 @@
-import glob, os, chess.pgn
 from datasets import (
     GeneratorBasedBuilder, DatasetInfo, SplitGenerator, Split,
     Features, Value, Array2D
@@ -19,21 +18,26 @@ class ChessPGNDataset(GeneratorBasedBuilder):
         )
 
     def _split_generators(self, dl_manager):
+        import os
         # data_dir is the root of your dataset repo
         data_dir = self.config.data_dir
         return [
           SplitGenerator(
             name=Split.TRAIN,
-            gen_kwargs={"shards": glob.glob(os.path.join(data_dir,"train","*.pgn"))}
+            gen_kwargs={"shards": [pgn.path for pgn in os.scandir(os.path.join(data_dir,"train")) if pgn.name.endswith(".pgn")]},
+            # gen_kwargs={"shards": glob.glob(os.path.join(data_dir,"train","*.pgn"))}
           ),
           SplitGenerator(
             name=Split.TEST,
-            gen_kwargs={"shards": glob.glob(os.path.join(data_dir,"test","*.pgn"))}
+            gen_kwargs={"shards": [pgn.path for pgn in os.scandir(os.path.join(data_dir,"test")) if pgn.name.endswith(".pgn")]},
+            # gen_kwargs={"shards": glob.glob(os.path.join(data_dir,"test","*.pgn"))}
           ),
         ]
 
     def _generate_examples(self, shards):
+        import chess.pgn
         uid = 0
+
         for path in sorted(shards):
             with open(path, "r") as f:
                 while (game := chess.pgn.read_game(f)) is not None: