Proximal policy optimization

Thus far, our discussion of RL has looked at simpler techniques for building agents with bandits and Q-learning. Q-learning is a popular algorithm, and as we learned, deep Q neural networks provide us with a great foundation to use to solve more difficult problems, such as a cart balancing a pole. The following table summarizes the various RL algorithms, what conditions they are capable of working in, and how they function:

Algorithm	Model	Policy	Action	Observation	Operator
Q-Learning	Model-free	Off-policy	Discrete	Discrete	Q value
SARSA – State Action Reward State Action	Model-free	On-policy	Discrete	Discrete	Q value
DQN – Deep Q Network	Model-free	Off-policy	Discrete	Continuous	Q value
DDPG – Deep Deterministic Policy Gradient	Model-free	Off-policy	Continuous	Continuous	Q value
TRPO – Trust Region Policy Optimization...