class_docstr: Generates a dot description of a ssa block
code: def visit_all(self, block, nodename_prefix=""):
      for out_var in block.outputs:
          self.visit_output_vars(
              block, out_var, nodename_prefix=nodename_prefix
          )
      for op in block.operations:
          if op.op_type != "const":
              self.visit(block, op, nodename_prefix=nodename_prefix)
      return self
  
file_path: coremltools/coremltools/converters/mil/mil/visitors/dot_visitor.py
imports: from ..var import Var
label_desc: Use image node_id 7 for calling the DotVisitor obj's underlying member method code with example usage: obj.visit_all(block, nodename_prefix) and returns: self