Newest 'actor-critic' Questions

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100 views

Actor Network Target Value in A2C Reinforcement Learning

In DQN, we use; $Target = r+\gamma v(s')$ equation to train (fit) our network. It is easy to understand since we use the $Target$ value as the dependent variable like we do in supervised learning. I....

asked Apr 15 at 16:43

datatech

354 bronze badges

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votes

1answer

102 views

Reinforcement Learning - PPO: Why do so many implementations calculate the returns using the GAE? (Mathematical reason)

There are so many PPO implementations that use GAE and do the following: ...

machine-learning reinforcement-learning mathematics policy-gradients actor-critic

asked Mar 8 at 19:39

Johannes

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81 views

RL PPO Algorithm: Understanding the Value Function Loss term in PPO by OpenAI

In the Schulman 2017 PPO Paper, there is a value function loss term in the final loss in equation 9, where they state that the value function loss is the MSE of the target value and predicted value. ...

reinforcement-learning policy-gradients actor-critic

asked Jan 19 at 7:02

thrillingelf

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0answers

91 views

A2C learning very slowly when I try to make it learn on batches as compared to making it learn on each step

I tried this on openai gym environment - LunarLander-v2. I wrote two algorithms with just one difference: Made it learn on each step. Made it learn at the end of each episode. There is a ...

policy-gradients actor-critic

asked Jun 14 '20 at 12:58

starlord

111 bronze badge

1

vote

0answers

186 views

Pytorch XLA to solve the spawn problems in a Colab Env

As reference only, here is my code It seems that torch.multiprocessing.set_start_method("spawn") can't be used in an Colab Env. Only 'fork' is allowed. I have ...

python reinforcement-learning pytorch actor-critic

asked May 22 '20 at 12:53

jgauth

312 bronze badges

1

vote

0answers

24 views

Action selection in actor-critic algorithm:

I have an action space that is just a list of values given by acts = [i for i in range(10, 100, 10)]. According to pytorch documentary, the loss is calculated as below. Could someone explain to me how ...

reinforcement-learning pytorch actor-critic

asked Mar 30 '20 at 12:57

EArwa

456 bronze badges

2

votes

0answers

35 views

Actions taken by agentn/ agent performance not improving

Hi I am trying to develop an rl agent using PPO algorithm. My agent takes an action(CFM) to maintain a state variable called RAT in between 24 to 24.5. I am using PPO algorithm of stable-baselines ...

reinforcement-learning actor-critic keras-rl discounted-reward

asked Jan 21 '20 at 5:41

cvg

4756 silver badges16 bronze badges

1

vote

0answers

27 views

Rewards are converged but with a lot of variations

I am training a reinforcement learning agent on an episodic task of fixed episode length. I am tracking the training process by plotting the cumulative rewards over an episode. I am using tensorboard ...

reinforcement-learning ai actor-critic

asked Nov 29 '19 at 10:28

cvg

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1answer

101 views

Having a reward structure which gives high positive rewards compared to the negative rewards

I am training an RL agent using PPO algorithm for a control problem. The objective of the agent is to maintain temperature in a room. It is an episodic task with episode length of 9 hrs and step size(...

reinforcement-learning dqn ai actor-critic monte-carlo

asked Nov 27 '19 at 4:39

cvg

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1

vote

1answer

47 views

Formulation of a reward structure

I am new to reinforcement learning and experimenting with training of RL agents. I have a doubt about reward formulation, from a given state if a agent takes a good action i give a positive reward, ...

reinforcement-learning ai actor-critic keras-rl discounted-reward

asked Nov 26 '19 at 10:26

cvg

4756 silver badges16 bronze badges

1

vote

0answers

237 views

Actor Critic Model implementation

I am going to work on a project which requires implementation of A2C model using Tensorflow 2.0. I am new in the Machine Learning field and also in Python. These are topics which I have covered ...

machine-learning deep-learning reinforcement-learning implementation actor-critic

asked Nov 25 '19 at 0:42

EMT

134 bronze badges

0

votes

1answer

59 views

How to handle differences between training and deploying of an RL agent

Hi I am training an RL agent for a control problem. The objective of the agent is to maintain temperature in a zone. It is an episodic task with episode length of 10 hrs and actions being taken every ...

reinforcement-learning dqn ai actor-critic monte-carlo

asked Nov 18 '19 at 7:16

cvg

4756 silver badges16 bronze badges

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votes

1answer

372 views

Different results every time I train a reinforcement learning agent

I am training an RL agent for a control problem using PPO algorithm. I am using stable-baselines library for it. The objective of an agent is to maintain a temperature of 24 deg in a zone and it ...

deep-learning reinforcement-learning dqn actor-critic monte-carlo

asked Nov 6 '19 at 11:03

cvg

4756 silver badges16 bronze badges

3

votes

1answer

3k views

Evaluating a trained Reinforcement Learning Agent?

I am new to reinforcement learning agent training. I have read about PPO algorithm and used stable baselines library to train an agent using PPO. So my question here is how do I evaluate a trained RL ...

reinforcement-learning dqn actor-critic monte-carlo keras-rl

asked Oct 30 '19 at 11:41

cvg

4756 silver badges16 bronze badges

2

votes

2answers

2k views

Agent always takes a same action in DQN - Reinforcement Learning

I have trained an RL agent using DQN algorithm. After 20000 episodes my rewards are converged. Now when I test this agent, the agent is always taking the same action , irrespective of state. I find ...

reinforcement-learning dqn policy-gradients actor-critic

asked Oct 4 '19 at 15:02

cvg

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1answer

49 views

Reward is converging but actions taken by trained agent are illogical in reinforcement learning

I am training a reinforcement learning agent using DQN. My state space has 6 variables and the agent can one action which is discretized into 500 actions My reward structure looks like ...

python reinforcement-learning policy-gradients ai actor-critic

asked Oct 3 '19 at 11:47

cvg

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vote

1answer

44 views

Why can't Policy Gradient Algorithm be seen as an Actor-Critic Method?

During the equation deducing in policy gradient algorithm(e.g., REINFORCE), we are actually using an expectancy of total reward, which we try to maximize. $$\overline{R_\theta}=E_{\tau\sim\pi_\theta}[...

machine-learning reinforcement-learning q-learning policy-gradients actor-critic

asked Jul 22 '19 at 9:54

KningTG

111 bronze badge

1

vote

1answer

713 views

A2C Continuous for Pendulum-v0 working implementation, negation for loss and entropy calculation

very good implementation of A2C continuous for Pendulum-v0 Code has snippet to stop execution when mean of last 10 or 20 is higher than -20 but the results look like: ...

neural-network distribution gaussian openai-gym actor-critic

asked Jun 23 '19 at 1:25

mLstudent33

5424 silver badges16 bronze badges

1

vote

1answer

418 views

multipying negated gradients by actions for the loss in actor nn of DDPG

In this Udacity project code that I have been combing through line by line to understand the implementation, I have stumbled on a part in class Actor where this ...

policy-gradients actor-critic

asked Mar 24 '19 at 14:42

mLstudent33

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vote

0answers

44 views

Reinforcement learning - generating a matrix of continuous values with varying size for test data generation

Currently, I am using RL A3C algorithm for test data generation, where for a set of 30 functions written in C (mostly basic algorithms like Prime number checks, triangle validity, etc.) I try to ...

neural-network reinforcement-learning rnn markov-process actor-critic

asked Mar 13 '19 at 1:55

Cegy

211 bronze badge

0

votes

2answers

66 views

Proof subtracting baseline doesn't influence gradient can be used to show no gradient exist at all?

I am using David Silver's course in RL to help me write my thesis. However, I am baffled by the proof given in lecture 7 slide 29: slideshow \begin{align} \mathbb{E}_{\pi_\theta}[\nabla_\theta \log_\...

reinforcement-learning policy-gradients actor-critic

asked Feb 5 '19 at 1:21

Alex Van de Kleut

112 bronze badges

1

vote

1answer

98 views

Stability of value function approximation in policy gradients

In DQNs, function approximation of the Q-values is unstable for correlated updates. In policy gradients with a baseline, will the value function of the policy not be plagued by the same correlated ...

neural-network reinforcement-learning policy-gradients actor-critic

asked Oct 16 '18 at 19:23

Johann

434 bronze badges

3

votes

1answer

322 views

Time horizon T in policy gradients (actor-critic)

I am currently going through the Berkeley lectures on Reinforcement Learning. Specifically, I am at slide 5 of this lecture. At the bottom of that slide, the gradient of the expected sum of rewards ...

machine-learning deep-learning reinforcement-learning policy-gradients actor-critic

asked Aug 28 '18 at 14:56

Dummie Variable

762 bronze badges

2

votes

2answers

607 views

A3C - Turning action probabilities into intensities

I'm experimenting with using an A3C network to learn to play old Atari video games. My network outputs a set of probabilities for each possible action (e.g. left, right, shoot), and I use this ...

machine-learning reinforcement-learning probability actor-critic

asked Jan 27 '18 at 12:49

Levi Botelho

1333 bronze badges

3

votes

1answer

1k views

How to design two different neural nets for actor and critic RL?

In order to have an actor critic RL model there are two things to be satisfied . Value approximation function should converge to a local minimum $$\sum_s d^{\pi}(s) \sum_a \pi(s,a)[Q^{\pi}(s,a) - ...

reinforcement-learning actor-critic

asked Dec 5 '17 at 11:39

Shamane Siriwardhana

7771 gold badge6 silver badges24 bronze badges

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Questions tagged [actor-critic]

Actor Network Target Value in A2C Reinforcement Learning

Reinforcement Learning - PPO: Why do so many implementations calculate the returns using the GAE? (Mathematical reason)

RL PPO Algorithm: Understanding the Value Function Loss term in PPO by OpenAI

A2C learning very slowly when I try to make it learn on batches as compared to making it learn on each step

Pytorch XLA to solve the spawn problems in a Colab Env

Action selection in actor-critic algorithm:

Actions taken by agentn/ agent performance not improving

Rewards are converged but with a lot of variations

Having a reward structure which gives high positive rewards compared to the negative rewards

Formulation of a reward structure

Actor Critic Model implementation

How to handle differences between training and deploying of an RL agent

Different results every time I train a reinforcement learning agent

Evaluating a trained Reinforcement Learning Agent?

Agent always takes a same action in DQN - Reinforcement Learning

Reward is converging but actions taken by trained agent are illogical in reinforcement learning

Why can't Policy Gradient Algorithm be seen as an Actor-Critic Method?

A2C Continuous for Pendulum-v0 working implementation, negation for loss and entropy calculation

multipying negated gradients by actions for the loss in actor nn of DDPG

Reinforcement learning - generating a matrix of continuous values with varying size for test data generation

Proof subtracting baseline doesn't influence gradient can be used to show no gradient exist at all?

Stability of value function approximation in policy gradients

Time horizon T in policy gradients (actor-critic)

A3C - Turning action probabilities into intensities

How to design two different neural nets for actor and critic RL?

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Questions tagged [actor-critic]

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