code: def launch(self):
      
      # Make it easy to run TensorBoard inside other programs, e.g. Colab.
      server = self._make_server()
      thread = threading.Thread(target=server.serve_forever, name='TensorBoard')
      thread.daemon = True
      thread.start()
      return server.get_url()
docs: Python API for launching TensorBoard.
  
      This method is the same as main() except it launches TensorBoard in
      a separate permanent thread. The configure() method must be called
      first.
  
      Returns:
        The URL of the TensorBoard web server.
  
      :rtype: str