KeyError: '`torchvision` not found in .cortex.yml data_paths'

[pengyang1225]

Traceback (most recent call last):
File "scripts/main.py", line 66, in
run(controller)
File "/home/py/miniconda3/envs/DIM/lib/python3.6/site-packages/cortex/main.py", line 38, in run
data.setup(**exp.ARGS['data'])
File "/home/py/miniconda3/envs/DIM/lib/python3.6/site-packages/cortex/lib/data/init.py", line 69, in setup
plugin.handle(source, **data_args)
File "/home/py/miniconda3/envs/DIM/lib/python3.6/site-packages/cortex/built_ins/datasets/torchvision_datasets.py", line 85, in handle
torchvision_path = self.get_path('torchvision')
File "/home/py/miniconda3/envs/DIM/lib/python3.6/site-packages/cortex/plugins.py", line 104, in get_path
'{} not found in {} data_paths'.format(source, _config_name))
KeyError: 'torchvision not found in .cortex.yml data_paths'

can you tell me how to do? thanks