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getLearnableParameters

Obtain learnable parameter values from policy or value function representation

Description

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val = getLearnableParameters(rep) returns the values of the learnable parameters from the reinforcement learning policy or value function representation rep.

Examples

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Assume that you have an existing trained reinforcement learning agent. For this example, load the trained agent from Train DDPG Agent to Control Double Integrator System.

load('DoubleIntegDDPG.mat','agent') 

Obtain the critic representation from the agent.

critic = getCritic(agent);

Obtain the learnable parameters from the critic.

params = getLearnableParameters(critic);

Modify the parameter values. For this example, simply multiply all of the parameters by 2.

modifiedParams = cellfun(@(x) x*2,params,'UniformOutput',false);

Set the parameter values of the critic to the new modified values.

critic = setLearnableParameters(critic,modifiedParams);

Set the critic in the agent to the new modified critic.

agent = setCritic(agent,critic);

Assume that you have an existing trained reinforcement learning agent. For this example, load the trained agent from Train DDPG Agent to Control Double Integrator System.

load('DoubleIntegDDPG.mat','agent') 

Obtain the actor representation from the agent.

actor = getActor(agent);

Obtain the learnable parameters from the actor.

params = getLearnableParameters(actor);

Modify the parameter values. For this example, simply multiply all of the parameters by 2.

modifiedParams = cellfun(@(x) x*2,params,'UniformOutput',false);

Set the parameter values of the actor to the new modified values.

actor = setLearnableParameters(actor,modifiedParams);

Set the actor in the agent to the new modified actor.

agent = setActor(agent,actor);

Input Arguments

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Policy or value function representation, specified as one of the following:

To create a policy or value function representation, use one of the following methods:

  • Create a representation using the corresponding representation object.

  • Obtain the existing value function representation from an agent using getCritic

  • Obtain the existing policy representation from an agent using getActor.

Output Arguments

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Learnable parameter values for the representation object, returned as a cell array. You can modify these parameter values and set them in the original agent or a different agent using the setLearnableParameters function.

Compatibility Considerations

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Behavior changed in R2020a

Introduced in R2019a