I am getting an error when trying to train an RL agent in matlab, I am using MATLAB 2024a

I am trying to run the following example in Matlab:

openExample('rl/TrainTD3AgentForPMSMControlExample')

It gives me the following error:

Error using rl.internal.train.OffPolicyTrainer/run_internal_/nestedRunEpisode (line 284)

Error in 'mcb_pmsm_foc_sim_RL/Current Control/Input Scaling/ Calculate Position and Speed/Speed Measurement': Failed to evaluate mask initialization commands.

Error in rl.internal.train.OffPolicyTrainer/run_internal_ (line 351)

out = nestedRunEpisode(policy);

Error in rl.internal.train.OffPolicyTrainer/run_ (line 39)

result = run_internal_(this);

Error in rl.internal.train.Trainer/run (line 8)

result = run_(this);

Error in rl.internal.trainmgr.OnlineTrainingManager/run_ (line 123)

trainResult = run(trainer);

Error in rl.internal.trainmgr.TrainingManager/run (line 4)

result = run_(this);

Error in rl.agent.AbstractAgent/train (line 86)

trainingResult = run(tm);

Caused by:

Error using rl.env.internal.reportSimulinkSimError (line 29)

Cannot change property 'Enabled' of 'mcb_pmsm_foc_sim_RL/Current Control/Input Scaling/ Calculate Position and Speed/Speed Measurement' while simulation is running

Answer 1

[Sreeram]

Hi @Mxolisi,

This looks like a bug to me. However, here is a workaround to unblock this:

Replace “Speed Measurement” block in ‘mcb_pmsm_foc_sim_RL/Current Control/Input Scaling/ Calculate Position and Speed’ with “Speed Measurement” block from ‘Motor Control Blockset HDL Support/Sensor Decoders’.

Make sure to set all the block parameters to be exactly same as that of the original “Speed and Measurement” block before commenting it out.

I hope this helps!