code: def is_active(self):
      
      if not self.multiplexer:
        return False
  
      if self._is_active:
        # We have already determined that the projector plugin should be active.
        # Do not re-compute that. We have no reason to later set this plugin to be
        # inactive.
        return True
  
      if self._thread_for_determining_is_active:
        # We are currently determining whether the plugin is active. Do not start
        # a separate thread.
        return self._is_active
  
      # The plugin is currently not active. The frontend might check again later.
      # For now, spin off a separate thread to determine whether the plugin is
      # active.
      new_thread = threading.Thread(
          target=self._determine_is_active,
          name='ProjectorPluginIsActiveThread')
      self._thread_for_determining_is_active = new_thread
      new_thread.start()
      return False
docs: Determines whether this plugin is active.
  
      This plugin is only active if any run has an embedding.
  
      Returns:
        Whether any run has embedding data to show in the projector.