๐Algorithm Taxonomy
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Deep RL algorithms can be classified into a family tree based on their methods / functions they learn, such as the one shown below.

Algorithms often extends an existing one by modifying or adding components. Most model-free algorithms are descended from SARSA and REINFORCE. The figure below shows some of the algorithms in SLM Lab, and their relationships.

Naturally, implementations can be consistent with this theoretical taxonomy by using class inheritance and modular components. This is precisely what SLM Lab does.
REINFORCE
On-policy
Learning/teaching
Classic
SARSA
On-policy
Tabular-like
Classic
DQN/DDQN+PER
Off-policy
Discrete actions
Classic, Box2D, Atari
A2C
On-policy
Fast iteration
Classic, Box2D, Atari
PPO
On-policy
General purpose
Classic, Box2D, MuJoCo (11), Atari (54)
SAC
Off-policy
Continuous control
Classic, Box2D, MuJoCo
See Running Benchmarks for complete algorithm ร environment matrix.
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