code: def draw_label(self, layout_info, ax):
          
          label_info = layout_info[list(self.vars)]
          label_info._meta = {'dimension': 'cols'}
          label_info = self.labeller(label_info)
          self.draw_strip_text(label_info, 'top', ax)
docs: Draw facet label onto the axes.
  
          This function will only draw labels if they are needed.
  
          Parameters
          ----------
          layout_info : dict-like
              facet information
          ax : axes
              Axes to label