metrics.classification.ConfusionMatrix() not available
🐛 Bug
The ConfusionMatrix class called from metrics.classification.ConfusionMatrix is not working. When trying to import class it fails.
To fix issue the init.py file of the metrics module needs to include a comma following the ConfusionMatrix line like so
  from pytorch_lightning.metrics.classification import (                               
      Accuracy,                                                                        
      Precision,                                                                       
      Recall,                                                                          
      FBeta,                                                                           
      F1,                                                                              
     ConfusionMatrix,                                                                 
  )             

This issue occurs on the latest versions of pytorch_lightning.