class_docstr: Generates a dot description of a ssa block
code: def visit_output_vars(self, block, var, nodename_prefix=""):
      label = "output: " + var.name
      if var.name in self.highlights:
          self.result.append(
              '"'
              + nodename_prefix
              + var.name
              + '"'
              + '[label="'
              + label
              + '",fillcolor=%s,style=filled,fontcolor=%s]'
              % (self.highlights[var.name], "violetred")
          )
      else:
          self.result.append(
              '"'
              + nodename_prefix
              + var.name
              + '"'
              + '[label="'
              + label
              + '",fontcolor=%s]' % ("violetred")
          )
  
      parent_op = var.op
      edge = (
          '"'
          + nodename_prefix
          + "op: "
          + parent_op.name
          + '"'
          + " -> "
          + '"'
          + nodename_prefix
          + var.name
          + '"'
      )
      self.result.append(edge)
      self.visit(block, parent_op, nodename_prefix=nodename_prefix)
  
file_path: coremltools/coremltools/converters/mil/mil/visitors/dot_visitor.py
imports: from ..var import Var
label_desc: Use image node_id 6 for calling the DotVisitor obj's underlying member method code with example usage: obj.visit_output_vars(block, var, nodename_prefix) without return types