Assignment #10

Provide a short discussion of each of the assigned papers (listed under Course Materials). Below are some questions to think about.

Feudal RL

Questions

• What information is being hidden? How do the principles of information-hiding in this paper extend to more complex domains that are, for example, not explicitly spatial?
• What "goals" is a higher-level controller communicating to its lower-level?
• The example studied in this paper is a stochastic shortest paths problem. Does the approach extend to more general reward functions?

h-DQN

Questions

• What information is being hidden?
• What goals are being communicated to the lower-level, e.g. in Atari? Are there goals that cannot be specified this way?
• When are the low-level actions terminated?
• Could this method be extended to have multiple levels?
• How does this architecture differ from feudal Q? Does it require more or less engineering effort to set up?
• "It is important to note that transitions generated by Q_2 run at a slower time-scale than the transitions generated by Q_1." Why is this? What determines when a transition happens at the Q_2 level?
• Could you train this same architecture using REINFORCE? In what ways would that be a good/bad idea?
• Is the game in section 4.1 an MDP? Why do you think this method works better than flat Q learning?

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