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Questions tagged [value-based-methods]

For questions about value-based reinforcement learning (RL) methods (or algorithms), which first learn a value function and then derive the policy from it. An example of a value-based RL algorithm is Q-learning.

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Can Q-learning rewards and next states be non-deterministic?

I am working in a team to develop a Q-learning based approach for hyperparameter tuning. I have a disagreement with one of my teammates on how they defined this problem. They defined it as follows: ...
Ahmed Mokhtar's user avatar
4 votes
1 answer
474 views

Why are policy gradient methods more effective in high-dimensional action spaces?

David Silver argues, in his Reinforcement Learning course, that policy-based reinforcement learning (RL) is more effective than value-based RL in high-dimensional action spaces. He points out that the ...
Saucy Goat's user avatar
0 votes
0 answers
44 views

As someone starting out in RL, could you help me understand the differences between actor-only, critic-only, and actor-critic methods?

I have been reading some medium articles and these three methods pop up a lot. I am wondering what the differences between these are, what are the advantages of one over the other, etc. Also from my ...
No-Time-To-Day's user avatar
1 vote
0 answers
273 views

Is it possible to combine two policy-based RL agents?

I am developing an RL agent for a game environment. I have found out that there are two strategies to do well in the game. So I have trained two RL agents using neural networks with distinct reward ...
BlackBrain's user avatar
3 votes
1 answer
427 views

What is the advantage of using MCTS with value based methods over value based methods only?

I have been trying to understand why MCTS is very important to the performance of RL agents, and the best description I found was from the paper Bootstrapping from Game Tree Search stating: ...
Hossam's user avatar
  • 33
1 vote
1 answer
189 views

Why do we need to have two heads in D3QN to obtain value and advantage separately, if V is the average of Q values?

I have two questions on the Dueling DQN paper. First, I have an issue on understanding the identifiability that Dueling DQN paper mentions: Here is my question: If we have given Q-values $Q(s, a; \...
Afshin Oroojlooy's user avatar
2 votes
0 answers
143 views

What kind of reinforcement learning method does AlphaGo Deepmind use to beat the best human Go player?

In reinforcement learning, there are model-based versus model-free methods. Within model-based ones, there are policy-based and value-based methods. AlphaGo Deepmind RL model has beaten the best Go ...
user781486's user avatar
5 votes
1 answer
524 views

Is reinforcement learning only about determining the value function?

I started reading some reinforcement learning literature, and it seems to me that all approaches to solving reinforcement learning problems are about finding the value function (state-value function ...
Felix P.'s user avatar
  • 297
1 vote
0 answers
96 views

What are the disadvantages of actor-only methods with respect to value-based ones?

While the advantages of actor-only algorithms, the ones that search directly the policy without the use of the value function, are clear (possibility of having a continuous action space, a stochastic ...
unter_983's user avatar
  • 331
1 vote
0 answers
58 views

Are policy-based methods better than value-based methods only for large action spaces?

In different books on reinforcement learning, policy-based methods are motivated by their ability to handle large (continuous) action spaces. Is this the only motivation for the policy-based methods? ...
tmaric's user avatar
  • 392
3 votes
1 answer
453 views

Is it possible for value-based methods to learn stochastic policies?

Is it possible for value-based methods to learn stochastic policies? I'm trying to get a clear picture of the different categories for RL algorithms, and while doing so I started to think about ...
Krrrl's user avatar
  • 211