code: def graph_repr(self):
          
  
          # Replace any floating point numbers in the expression
          # with their scientific notation
          final = re.sub(r"[-+]?\d*\.\d+",
                         lambda x: format(float(x.group(0)), '.2E'),
                         self._expr)
          # Graphviz interprets `\l` as "divide label into lines, left-justified"
          return "Expression:\\l  {}\\l".format(
              final,
          )
docs: Short repr to use when rendering Pipeline graphs.