code: def test_sub_split_num_shards(self):
      self.assertEqual(
          self._builder.info.splits["train[75%:]"].num_shards, 1
      )
  
imports: from tensorflow_datasets import testing
  from tensorflow_datasets.core import naming
  from tensorflow_datasets.core import proto
  from tensorflow_datasets.core import splits
  from tensorflow_datasets.core.utils import shard_utils
  import tensorflow_datasets.public_api
label_desc: Use image node_id 4 for calling the SplitsTest obj's underlying member method code with example usage: obj.test_sub_split_num_shards() without return types