• 自定义颜色
      1. label_dic = {1: 'Still', 2: 'Walking', 3: 'Run', 4: 'Bike', 5: 'Car', 6: 'Bus', 7: 'Train', 8: 'Subway'}
      2. cmap = mpl.cm.get_cmap('viridis', 8)
      3. label_cols = cmap(np.linspace(0, 1, 8))
      4. label_cols = [mpl.colors.to_hex(i) for i in label_cols]
      5. label_cols