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  1. Jan 29, 2021 · Deep Reinforcement learning has been a rising field in the last few years. A good approach to start with is the value-based method, where the state (or state-action) values are learned. In this post, a comprehensive review is provided where we focus on Q-learning and its extensions.

  2. Jan 7, 2024 · Popular value-based methods include Q-learning, SARSA, and temporal difference (TD) learning. This article will provide an overview of policy-based vs value-based reinforcement learning approaches, comparing their strengths and weaknesses. We will also explore common algorithms for each method.

    • What Is RL? A Short Recap
    • The Two Types of Value-Based Methods
    • The Bellman Equation: Simplify Our Value Estimation
    • Monte Carlo vs Temporal Difference Learning

    In RL, we build an agent that can make smart decisions. For instance, an agent that learns to play a video game. Or a trading agent that learns to maximize its benefits by making smart decisions on what stocks to buy and when to sell. But, to make intelligent decisions, our agent will learn from the environment by interacting with it through trial ...

    In value-based methods, we learn a value function that maps a state to the expected value of being at that state. The value of a state is the expected discounted return the agent can get if it starts at that state and then acts according to our policy. If you forgot what discounting is, you can read this section. Remember that the goal of an RL age...

    The Bellman equation simplifies our state value or state-action value calculation. With what we learned from now, we know that if we calculate the V(St)V(S_t)V(St​) (value of a state), we need to calculate the return starting at that state and then follow the policy forever after. (Our policy that we defined in the following example is a Greedy Pol...

    The last thing we need to talk about before diving into Q-Learning is the two ways of learning. Remember that an RL agent learns by interacting with its environment. The idea is that using the experience taken, given the reward it gets, will update its value or policy. Monte Carlo and Temporal Difference Learning are two different strategies on how...

  3. In value-based methods, we learn a value function that maps a state to the expected value of being at that state. The value of a state is the expected discounted return the agent can get if it starts at that state and then acts according to our policy.

  4. This article systematically introduces and summarizes reinforcement learning methods from these two categories. First, it summarizes the reinforcement learning methods based on value functions, including classic Q-learning, DQN, and effective improvement methods based on DQN.

  5. May 4, 2022 · In Value-based methods, instead of training a policy function, we train a value function that maps a state to the expected value of being at that state. The value of a state is the expected discounted return the agent can get if it starts in that state, and then act according to our policy.

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  7. Value-based techniques aim to learn the value of states (or learn an estimate for value of states) and actions: that is, they learn value functions or Q functions. We then use policy extraction to get a policy for deciding actions.

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