class_docstr: Type specification for `None` value.
code: def _to_legacy_output_classes(self):
      return self
  
imports: from tensorflow.python.framework import composite_tensor
  from tensorflow.python.framework import type_spec
  from tensorflow.python.framework import type_spec_registry
label_desc: Use image node_id 13 for calling the NoneTensorSpec obj's underlying member method code with example usage: obj._to_legacy_output_classes() and returns: self