Over the last couple of chapters, we learned about the basics of ML—and, of course, specifically RL—using the Unity editor, and things were good. Unfortunately, the number of states in an RL problem can quickly exceed billions. The number of states in the game Go has been calculated to exceed the number of atoms in the observable universe, for instance. Now, dealing with these unfathomable numbers of states and doing the math for these types of problems isn't trivial. In fact, it is only just recently that we have been able to grapple with these numbers, thanks to the efforts of Google and others in releasing some powerful ML tools collectively called TensorFlow. TensorFlow is a math-execution library that has become the cornerstone of ML research because of the power it provides. Now, the preferred toolset when working...
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