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Anh Tran

MathWorks

Last seen: 2 years ago |  Active since 2017

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  • 3 Month Streak
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Answered
How to pretrain a stochastic actor network for PPO training?
Hi Jan, You can pretrain a stochastic actor with Deep Learning Toolbox's trainNetwork with some additional work. Emmanouil gave...

3 years ago | 1

| accepted

Answered
On updating the policy with sim functions and Custom Loop
The approach looks OK, however there is an issue. You must update the agent's actor and critic after each learning iteration. So...

4 years ago | 0

Answered
Splitting the input layer of deep neural network (used for the actor of a DDPG agent)
You can define 2 observation specifications on the environment. Thus, the agent will receive splitted input to begin with. Moreo...

4 years ago | 0

Answered
"Unable to evaluate the loss function. Check the loss function and ensure it runs successfully": `gradient` can't access the custom loss function
In the training loop, you collect the actor from agent.brain, which is an rlPGAgent. The actor, thus, used the loss function def...

4 years ago | 1

| accepted

Answered
How to extract the trained actor network from the trained agent in Matlab environment? (Reinforcement Learning Toolbox)
You can collect the actor (or policy) from the trained agent with getActor. Then, you can use the actor to predict the best acti...

4 years ago | 0

| accepted

Answered
Deep Deterministic Policy Gradient Agents (DDPG at Reinforcement Learning), actor output is oscilating a few times then got stuck on the minimum.
A few points I have identified with your original script You should include the action bounds when defining action specificatio...

4 years ago | 0

| accepted

Answered
Create custom policy function for a RL DQN.
Currently there I do not see any workaround to modify DQN policy directly with buit-in rlDQNAgent. A possible workaround is to r...

4 years ago | 0

Answered
how to use GPU for actor and critic while env simulation happens on multiple cores for RL training
We are continuously improving GPU training performance with parallel computing in future releases. For now, I would recommend th...

4 years ago | 0

Answered
rlTable using multiple element in rlFiniteSetSpec
This is a current limitation with rlTable in MATLAB R2020a. To work with multiple observation channels, you can try a neural net...

4 years ago | 0

Answered
How can I extract a trained RL Agent's network's weights and biases?
You can get the parameters from the trained's critic representation for DQN agent. In MATLAB R2020a, see getLearnableParameters ...

4 years ago | 0

| accepted

Answered
How to deploy Trained Reinforcement Learning Policy with a NN having two input layer?
As of R2020a, you can create a DQN agent with Q(s) value function. Q(s) takes observation as input and output Q(s,a) for each po...

4 years ago | 0

| accepted

Answered
load multiple trained reinforcement agents into MATLAB workspace
It is not neccessary to load all 2000 agents into MATLAB (consume memory and tricky to assign unique name) to evaluate their per...

4 years ago | 0

| accepted

Answered
number of look ahead steps in DDPG Agent Options
I am not sure what does reward sampling mean. "NumStepsToLookAhead" in rlDDPGAgentOptions changes the critic's target values in ...

4 years ago | 1

Answered
how can I display the trained network weights in reinforcement learning agent?
Hi Ru SeokHun, In MATLAB R2019b and below, there is a 2-step process: Use getActor, getCriitic functions to gather the actor a...

5 years ago | 1

Answered
How to TRAIN further a previously trained agent?
I will answer again, hopefully clear your confusion. % Train the agent trainingStats = train(agent, env, trainOpts); After th...

5 years ago | 2

Answered
Clean up Simulink block diagram
From MATLAB R2019b, you can improve your diagram layout and appearance by opening the FORMAT tab on the toolstrip and click on A...

5 years ago | 5

Answered
Implementing A Siamese Architecture With Matlab
You can refer to the answer in this thread https://www.mathworks.com/matlabcentral/answers/399825-how-to-construct-a-siamese-ne...

5 years ago | 1

| accepted

Answered
How to construct a Siamese network using Matlab Neural Network Toolbox?
You can refer to these new examples to construct Siamese network: https://www.mathworks.com/help/deeplearning/examples/train-a-...

5 years ago | 1

Answered
Is there a way to set specific regions on an image for OCR?
You can specify region of interest, <https://www.mathworks.com/help/vision/ref/ocr.html#bt548t1-1-roi ROI>, as the second argume...

6 years ago | 0

| accepted

Answered
I want to adapt Fuzzy Logic Toolbox to be able to use the output of one system as the input of another
The current version of Fuzzy Logic Toolbox does not support internal looping of input and output variables. The simplest soluti...

7 years ago | 0

Answered
How to provide Negative Samples to trainACFObjectDetector() when using a Ground Truth file
(3) is correct. You do not have to add negative samples because trainACFObjectDetector automatically generates negative samples ...

7 years ago | 0

| accepted

Answered
The battery models in simscape are to complex. Is there a simple one?
You may want to try <https://www.mathworks.com/help/physmod/elec/ref/battery.html Simple battery model> block. You can right-cli...

7 years ago | 0

Answered
How do i calculate the winding R & L as well as magnetizing Rm & Lm of the linear transformer block?
You do not need to calculate these values but rather set them based on your application specification. All the parameters are de...

7 years ago | 0

| accepted

Answered
Train data for Semantic segmentation using existing Nets (e,g.Segnet) for different classes
The <https://www.mathworks.com/help/vision/examples/semantic-segmentation-using-deep-learning.html example> starts with training...

7 years ago | 0

Answered
filtfilt provides excessive transient
The transients observed are due to a combination of using a marginally stable filter coupled with the initial condition matching...

7 years ago | 2

Answered
How to count the number of objects within an area after simulink simulation ends
Yes, of course. After looking at <https://www.mathworks.com/help/simulink/examples/spiral-galaxy-formation-simulation-using-matl...

7 years ago | 1

| accepted

Answered
HDL coder for Kalman filter does not simulate
Hi Reddy, Are you referring to this <https://www.mathworks.com/help/hdlcoder/examples/fixed-point-type-conversion-and-refinem...

7 years ago | 0

Answered
How to insert a curve stemming from a measure in Simulink to use the parameter estimation?
Hi Frank, It seems that you are trying to input a vector into Simulink scope block. Simulink will treat each element of your ...

7 years ago | 0

| accepted

Answered
Is it possible to toggle visibility of signals in (floating) scope during simulation?
I was not able to find information on how to toggle which input signals are shown on the scope programmatically. I will create a...

7 years ago | 0

Answered
Is it possible to toggle visibility of signals in (floating) scope during simulation?
I tried a simple test to check if setting scope configuration in runtime is possible or not: 1. Open shipped demo 'vdp' >> v...

7 years ago | 0

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