CS & ML Basic
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Proximal Policy Optimization with Generalized Advantage Estimation (PPO2)CS & ML Basic 2023. 2. 14. 17:04
PPO2 (Proximal Policy Optimization with Generalized Advantage Estimation) is an extension of PPO that combines the PPO algorithm with Generalized Advantage Estimation (GAE), which is a method for estimating the advantage function. The main difference between PPO and PPO2 is the way they estimate the advantage function. In PPO, the advantage function is estimated using a single-step estimate, whi..
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Advantage Function in RLCS & ML Basic 2023. 2. 14. 16:02
The advantage function in reinforcement learning is a measure of how much better an action is compared to other actions in a given state. It is a critical component in many reinforcement learning algorithms, including PPO. Mathematically, the advantage function is defined as the difference between the expected reward of taking a specific action in a given state and the expected reward of followi..
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Proximal Policy Optimization (PPO) AlgorithmCS & ML Basic 2023. 2. 14. 16:02
The objective of the Proximal Policy Optimization (PPO) algorithm is to train a policy function that can control an agent's behavior in a given environment, such that it maximizes the expected cumulative reward over time. More formally, we can define the objective of PPO as follows: $$J(\theta) = \mathbb{E}{\pi{\theta}}\left[\sum_{t=0}^{\infty}\gamma^{t}r_{t}\right]$$ where \(J(\theta)\) is the ..