code: def generate_rt_pic(process_data, para_meter, scale):
      
      pic_path = para_meter['filename'] + '.png'
      plt.figure(figsize=(5.6 * scale, 3.2 * scale))
      for key in process_data.keys():
          plt.plot(process_data[key][:, 0], process_data[key][:, 1], label=str(key))
      plt.title(para_meter['title'])
      plt.xlabel(para_meter['x_axis_name'])
      plt.ylabel(para_meter['y_axis_name'])
      plt.legend(loc='upper left')
      plt.savefig(pic_path)
      return pic_path
docs: generate rater pic