question: import pytorch_lightning fails with ModuleNotFoundError: No module named 'tensorboard'
context: BUG
  I finished installing pytorch_lightnin by pip but can not import pytorch_lightning.
  Environment
  
  
  CUDA: 11.2
  
  
  GPU: v100 * 8
  
  
  Packges:
  -OpenCC==1.1.0
  -pytorch-lightning==1.1.2
  -six==1.14.0
  -tensorboard==2.4.0
  -tensorboard-plugin-wit==1.7.0
  -threadpoolctl==2.1.0
  -tokenizers==0.9.4
  -torch==1.10.2+cu113
  -transformers==4.1.1
  -yacs
  -lxml
  
  
  Error message
answer: @Rafael8830 Could you try reinstalling it? If the issue still persists, could you provide more info about your environment?