Machine Learning Tutorial Graphics - ROS2 - Dashing

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Hi, I am trying to do the Machine Learning Tutorial in the URL: https://emanual.robotis.com/docs/en/p... I am using Ubuntu 18.04, ROS2 Dashing , Gazebo 9.14, python 3.6

Can you help me please, How can I see the graphics?, What command I can use?

In the item, 9.3 Run Machine Learning, of the same tutorial, in the video, is used the command:

roslaunch turtlebot3_dqn result_graph.launch

But not function, I think, that command only applies for ROS1 Kinetic, with Ubuntu 16.04.

Note: The video shown in the item 9.3 Run Machine Learning, is the same video for distribution of ROS Kinetic and Dashing!!!

Thanks a lot.

EDS.