DRL	Deep Reinforcement Learning
HRL	Hierarchical Reinforcement Learning
PPO	Proximal Policy Optimization
HAC	Hierarchical Actor-Critic
A3C	Asynchronous Advantage Actor-Critic
DT	Decision Transformer
SMDP	Semi-Markov Decision Process
DT-HRL	Decision Transformer-based Hierarchical Reinforcement Learning
NLP	Natural Language Processing
RTG	Return-To-Go
PEL	Path-Efficiency Loss
MTGC-DT	Multi-Task Goal-Conditioned Decision Transformer