Redundant metric logging for TensorBoard
The following line causes logging a metric as a scalar in TensorBoard, although it is supposed to go only to the "hparams" section.

  
    
      pytorch-lightning/pytorch_lightning/loggers/tensorboard.py
    
    
         Line 169
      in
      01f1316
    
  
  
    

        
          
           self.log_metrics(metrics, 0) 
        
    
  


The resulting scalar graph is a vertical line with step 0 at x-axis and the metric going vertically upwards, which does not convey much information.
So I would suggest to remove this line