class_docstr: Generates a dot description of a graph in dictionary form.
code: def __str__(self):
      return self.get_result()
  
file_path: coremltools/coremltools/converters/mil/frontend/tensorflow/dot_visitor.py
imports: from coremltools.converters.mil.mil import types
label_desc: Use image node_id 7 for calling the DotVisitor obj's underlying member method code with example usage: obj.__str__() and returns: self