What Happened in Reinforcement Learning in 2021

One of the most exciting areas in machine learning right now is reinforcement learning. Its application is found in a diverse set of sectors like data processing, robotics, manufacturing, recommender systems, energy, and games, among others. What makes reinforcement learning (RL) different from other kinds of algorithms is that it does not depend on historical data sets. It learns through trial and error like human beings. Understanding its importance, the last few years have seen an accelerated pace in understanding and improving RL.