Update ace.py

ace.py

@@ -78,8 +78,8 @@ class MockupDataset(datasets.GeneratorBasedBuilder):
 
     # method parameters are unpacked from `gen_kwargs` as given in `_split_generators`
     def _generate_examples(self, split):
-        for i in range(data_config['size']):
+        for i in range(self.data_config['size']):
             yield key, {
-                "x": [0]*data_config['length'],
-                "y": [1]*data_config['length']
+                "x": [0]*self.data_config['length'],
+                "y": [1]*self.data_config['length']
             }