ImportError: cannot import name 'EvalResult' from 'pytorch_lightning'

[liuxianlin]

Hello, I encountered this error when configuring the environment. How can I solve it?
Traceback (most recent call last):
File "main.py", line 7, in
from source_separation.models.scripts import trainer, evaluator
File "/home/Music/ISMIR2020_U_Nets_SVS-master/source_separation/models/scripts/trainer.py", line 8, in
from source_separation.models.model_definition import get_class_by_name
File "/home/Music/ISMIR2020_U_Nets_SVS-master/source_separation/models/model_definition.py", line 3, in
from source_separation.models.tdc_net import TDC_NET_Framework
File "/home/Music/ISMIR2020_U_Nets_SVS-master/source_separation/models/tdc_net.py", line 8, in
from source_separation.models.dense_u_net import Dense_UNET_Framework, Dense_UNET
File "/home/Music/ISMIR2020_U_Nets_SVS-master/source_separation/models/dense_u_net.py", line 9, in
from source_separation.models.separation_framework import Spectrogram_based
File "/home/Music/ISMIR2020_U_Nets_SVS-master/source_separation/models/separation_framework.py", line 12, in
from pytorch_lightning import EvalResult
ImportError: cannot import name 'EvalResult' from 'pytorch_lightning' (/opt/conda/lib/python3.7/site-packages/pytorch_lightning/init.py)

[ws-choi]

HI @liuxianlin
It seems that the version of your pytorch_lightning is not 0.9.0.
Try reinstall pl like this

pip install pytorch_lightning==0.9.0 

I'm sorry for the poor install instruction.

[liuxianlin]

thanks @ws-choi
I got it.