class_docstr: `FeatureConnector` for integer class labels.
code: def _additional_repr_info(self) -> dict[str, int]:
      return {"num_classes": self.num_classes}
  
imports: from typing import Optional, Union
  from etils import epath
  import numpy
  from tensorflow_datasets.core.features import feature
  from tensorflow_datasets.core.features import tensor_feature
  from tensorflow_datasets.core.proto import feature_pb2
  from tensorflow_datasets.core.utils import type_utils
label_desc: Use image node_id 10 for calling the ClassLabel obj's underlying member method code with example usage: obj._additional_repr_info() and returns: dict