Traceback (most recent call last):
  File "sketch_gcn.py", line 392, in <module>
    model.train(epoch)
  File "sketch_gcn.py", line 264, in train
    self.conditional_generation(epoch)
  File "sketch_gcn.py", line 344, in conditional_generation
    make_image(sequence, epoch)
  File "sketch_gcn.py", line 155, in make_image
    pil_image.save(name, "JPEG")
  File "/root/anaconda3/envs/dpm-pc-gen/lib/python3.7/site-packages/PIL/Image.py", line 2169, in save
    fp = builtins.open(filename, "w+b")
FileNotFoundError: [Errno 2] No such file or directory: './model_save/500_output_.jpg'

原因分析：

PIL保存模型的时候，如果代码里的目录不存在，PIL不会自动创建目录，也不会主动抛出异常。