Update ace.py

ace.py

@@ -41,7 +41,7 @@ class MockupDataset(datasets.GeneratorBasedBuilder):
     BUILDER_CONFIGS = []
     
     def __init__(self, name=None, data_config={}, **kwargs):
-        super().__init__(**kwargs)
+        super().__init__(streaming=True, **kwargs)
         
         if 'length' not in data_config:
             data_config['length'] = 20
@@ -79,6 +79,7 @@ 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(self.data_config['size']):
+            print('generator iter', i)
             yield i, {
                 "x": [0]*self.data_config['length'],
                 "y": [1]*self.data_config['length']