Summary
In this chapter, we talked about higher-level RL libraries, their motivation, and their requirements. Then, we took a deep look at the PTAN library, which will be used in the rest of the book to simplify example code. This focus on the details of the methods rather than implementation will be extremely useful for you in later chapters of this book, as you progress further with RL.
In the next chapter, we will return to DQN methods by exploring extensions that researchers and practitioners have discovered since the classic DQN introduction to improve the stability and performance of the method.
