title: how to run tensorboard on CoLab?
body: <p>How to run tensorboard on CoLab?
  !tensorboard --logdir logs/
  this took a very long time with no display,
  What showed was 
  TensorBoard 1.15.0 at <a href="http://bcb8d733d00a:6006/" rel="nofollow noreferrer">http://bcb8d733d00a:6006/</a></p>