MullOverThings

Useful tips for everyday

Does Q-Learning converge to optimal?

Does Q-Learning converge to optimal?

Abstract. Q-learning (Watkins, 1989) is a simple way for agents to learn how to act optimally in controlled Markovian domains. We show that Q-learning converges to the optimum action-values with probability 1 so long as all actions are repeatedly sampled in all states and the action-values are represented discretely.

What is AQ Table Q-Learning?

Introducing the Q-Table. Q-Table is just a fancy name for a simple lookup table where we calculate the maximum expected future rewards for action at each state. Basically, this table will guide us to the best action at each state. There will be four numbers of actions at each non-edge tile.

What is Q-learning in ReInforcement learning?

Q-learning is an off policy reinforcement learning algorithm that seeks to find the best action to take given the current state. It’s considered off-policy because the q-learning function learns from actions that are outside the current policy, like taking random actions, and therefore a policy isn’t needed.

Is Q-Learning passive or active?

TD learning does not require the agent to learn the transition model….More videos on YouTube.

Fixed Policy (Active) Policy not fixed (Passive)
Model-free (real world) Temporal Difference Learning (TD) Q-learning

Which is better Q-learning or linear learning?

Q-Learning tends to converge a little slower, but has the capabilitiy to continue learning while changing policies. Also, Q-Learning is not guaranteed to converge when combined with linear approximation.

How is Q-learning combined with function approximation?

Q-learning can be combined with function approximation. This makes it possible to apply the algorithm to larger problems, even when the state space is continuous. One solution is to use an (adapted) artificial neural network as a function approximator.

What’s the difference between Double Q and Double Q-learning?

Double Q-learning. A variant called Double Q-learning was proposed to correct this. Double Q-learning is an off-policy reinforcement learning algorithm, where a different policy is used for value evaluation than what is used to select the next action.

How is the weight of a Q-learning table calculated?

Q-Learning table of states by actions that is initialized to zero, then each cell is updated through training. steps into the future the agent will decide some next step. The weight for this step is calculated as