What is epsilon in deep Q-learning?

What is epsilon in deep Q-learning?

Epsilon is used when we are selecting specific actions base on the Q values we already have. As an example if we select pure greedy method ( epsilon = 0 ) then we are always selecting the highest q value among the all the q values for a specific state.

How does epsilon affect Q-learning?

) parameter is related to the epsilon-greedy action selection procedure in the Q-learning algorithm. In the action selection step, we select the specific action based on the Q-values we already have. The epsilon parameter introduces randomness into the algorithm, forcing us to try different actions.

How do I reduce Epsilon Q-Learning?

One way to fix this is to have a decreasing epsilon value, which starts off high at the beginning of the learning process (since the agent knows nothing about its environment, it is helpful for it to explore as much as possible in the beginning), and then decrease this epsilon based on the number of steps or episodes …

What does epsilon look like?

An uppercase Epsilon looks like a modern uppercase E in the English alphabet, but the lowercase Epsilon looks more like a reversed 3. The Greeks actually borrowed the symbol from the Phoenician alphabet, where it is used to represent the letter He.

How does the Epsilon greedy Q learning algorithm work?

Epsilon-Greedy Q-Learning Algorithm We’ve already presented how we fill out a Q-table. Let’s have a look at the pseudo-code to better understand how the Q-learning algorithm works: In the pseudo-code, we initially create a Q-table containing arbitrary values, except the terminal states’. Terminal states’ action values are set to zero.

When to lower the epsilon value in machine learning?

Should the epsilon be bounded by the number of times the algorithm have visited a given (state, action) pair, or should it be bounded by the number of iterations performed? Lower the epsilon value for each time a given (state, action) pair has been encountered. Lower the epsilon value after a complete iteration has been performed.

How are learning rate and Epsilon related to each other?

In conclusion learning rate is associated with how big you take a leap and epsilon is associated with how random you take an action. As the learning goes on both should decayed to stabilize and exploit the learned policy which converges to an optimal one.

When does learning rate decay in Epsilon greedy?

As the learning goes on both should decayed to stabilize and exploit the learned policy which converges to an optimal one. As the answer of Vishma Dias described learning rate [decay], I would like to elaborate the epsilon-greedy method that I think the question implicitly mentioned a decayed-epsilon-greedy method for exploration and exploitation.