class_docstr: A `Dataset` with a single element.
code: def element_spec(self):
      return self._structure
  
imports: from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.data.util import structure
  from tensorflow.python.ops import gen_dataset_ops
label_desc: Use image node_id 2 for calling the _TensorDataset obj's underlying member method code with example usage: obj.element_spec() and returns: self