class_docstr: Composite tensor representation for `None` value.
code: def _type_spec(self):
      return NoneTensorSpec()
  
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 1 for calling the NoneTensor obj's underlying member method code with example usage: obj._type_spec() and returns: NoneTensorSpec