説明認識型経験リプレイ：ルール稠密環境における学習手法
Explanation-Aware Experience Replay in Rule-Dense Environments
経験バッファをルール説明ごとのクラスタに分割し、希少性や重要度に基づいて優先的にサンプリングするExplanation-Aware Experience Replayを提案し、DQN・TD3・SACに適用して従来の優先経験リプレイより優れた性能を示した。
著者: Francesco Sovrano, Alex Raymond, Amanda Prorok
分類: cs.LG, cs.AI, cs.RO
原文アブストラクト
Human environments are often regulated by explicit and complex rulesets. Integrating Reinforcement Learning (RL) agents into such environments motivates the development of learning mechanisms that perform well in rule-dense and exception-ridden environments such as autonomous driving on regulated roads. In this paper, we propose a method for organising experience by means of partitioning the experience buffer into clusters labelled on a per-explanation basis. We present discrete and continuous navigation environments compatible with modular rulesets and 9 learning tasks. For environments with explainable rulesets, we convert rule-based explanations into case-based explanations by allocating state-transitions into clusters labelled with explanations. This allows us to sample experiences in a curricular and task-oriented manner, focusing on the rarity, importance, and meaning of events. We label this concept Explanation-Awareness (XA). We perform XA experience replay (XAER) with intra and inter-cluster prioritisation, and introduce XA-compatible versions of DQN, TD3, and SAC. Performance is consistently superior with XA versions of those algorithms, compared to traditional Prioritised Experience Replay baselines, indicating that explanation engineering can be used in lieu of reward engineering for environments with explainable features.
