使用python训练模型时报错：ValueError: The 'astra_cuda' `impl` is not found.

问题遇到的现象和发生背景

使用python训练模型时报错：ValueError: The 'astra_cuda' impl is not found. This impl is either not supported, it may be misspelled, or external packages required are not available. Consult RAY_TRAFO_IMPLS to find the run-time available implementations.

问题相关代码，请勿粘贴截图

复现https://github.com/hongwang01/InDuDoNet

运行结果及报错内容

Traceback (most recent call last):
  File "train.py", line 23, in <module>
    from deeplesion.Dataset import MARTrainDataset
  File "/root/IDD+/deeplesion/__init__.py", line 1, in <module>
    from .Dataset import MARTrainDataset, nmar_prior, nmarprior
  File "/root/IDD+/deeplesion/Dataset.py", line 18, in <module>
    ray_trafo = build_gemotry(param)
  File "/root/IDD+/deeplesion/build_gemotry.py", line 75, in build_gemotry
    ray_trafo_hh = odl.tomo.RayTransform(reco_space_h, geometry_h, impl='astra_cuda')
  File "/root/miniconda3/envs/my-env/lib/python3.6/site-packages/odl/tomo/operators/ray_trafo.py", line 193, in __init__
    impl_type, self.__cached_impl = self._initialize_impl(impl)
  File "/root/miniconda3/envs/my-env/lib/python3.6/site-packages/odl/tomo/operators/ray_trafo.py", line 238, in _initialize_impl
    'implementations.'.format(impl)
ValueError: The 'astra_cuda' `impl` is not found. This `impl` is either not supported, it may be misspelled, or external packages required are not available. Consult `RAY_TRAFO_IMPLS` to find the run-time available implementations.

我的解答思路和尝试过的方法

尝试下载astra-toolbox，但没成功

我想要达到的结果

顺利进行训练

'implementations.'.format(impl)，impl是啥，报错语句提示说没找到这个东西

报错已经解决。解决方法：用conda install -c astra-toolbox astra-toolbox命令安装astra-toolbox。