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2. The option-critic architecture;Bacon,2017
3. Bagaria, A., & Konidaris, G. (2020). Option Discovery using Deep Skill Chaining. In International conference on learning representations.
4. Markovian state and action abstractions for MDPs via hierarchical MCTS;Bai,2016
5. Intrinsically motivated learning of hierarchical collections of skills;Barto,2014