code: def run(self, format=None, reduce=False, *args, **kwargs):
          
          plan = self._generate_plan()
          if reduce:
              # This will performa a transitive reduction on the underlying
              # graph, producing less edges. Mostly useful for the "dot" format,
              # when converting to PNG, so it creates a prettier/cleaner
              # dependency graph.
              plan.graph.transitive_reduction()
  
          fn = FORMATTERS[format]
          fn(sys.stdout, plan.graph)
          sys.stdout.flush()
docs: Generates the underlying graph and prints it.