We study diverse skill discovery in reward-free environments, aiming to discover all possible skills in simple grid-world environments where prior methods have struggled to succeed. This problem is formulated as mutual training of skills using an intrinsic reward and a discriminator trained to predict a skill given its trajectory. Our initial solution replaces the standard one-vs-all (softmax) discriminator with a one-vs-one (all pairs) discriminator and combines it with a novel intrinsic reward function and a dropout regularization technique. The combined approach is named APART: Diverse Skill Discovery using All Pairs with Ascending Reward and Dropout. We demonstrate that APART discovers all the possible skills in grid worlds with remarkably fewer samples than previous works. Motivated by the empirical success of APART, we further investigate an even simpler algorithm that achieves maximum skills by altering VIC, rescaling its intrinsic reward, and tuning the temperature of its softmax discriminator. We believe our findings shed light on the crucial factors underlying success of skill discovery algorithms in reinforcement learning.

在无奖励环境中研究多样化技能发现，使用内在奖励和一个通过轨迹预测技能的判别器进行技能的相互训练，通过使用所有对组合的判别器、新颖的内在奖励函数和辍学正则化技术的方式，取代了标准的一对多（softmax）判别器，所提出的组合方法命名为APART，在简单的网格环境中比以前的方法大大减少了样本数量，研究探究了更简单的算法，通过改变VIC、重新调整内在奖励和调整softmax判别器的温度来实现最大技能，我们相信我们的研究结果揭示了强化学习中技能发现算法成功的关键因素。

APART: 采用升序奖励和丢弃法的多样化技能发现