1. 官网下载Cityscapes数据集，百度网盘有备份
    2. pip install cityscapesscripts

    3. 生成脚本文件

      1. # Set CITYSCAPES_DATASET to your dataset root.
      3. # Create train ID label images.
      4. CITYSCAPES_DATASET='.' csCreateTrainIdLabelImgs
      6. # To generate panoptic groundtruth, run the following command.
      7. CITYSCAPES_DATASET='.' csCreatePanopticImgs --use-train-id
      9. # [Optional] Generate panoptic groundtruth with EvalId to match evaluation
      10. # on the server. This step is not required for generating TFRecords.
      11. CITYSCAPES_DATASET='.' csCreatePanopticImgs