class_docstr: Generates a dot description of a ssa block
code: def __str__(self):
      return self.get_result()
  
file_path: coremltools/coremltools/converters/mil/mil/visitors/dot_visitor.py
imports: from ..var import Var
label_desc: Use image node_id 9 for calling the DotVisitor obj's underlying member method code with example usage: obj.__str__() and returns: self