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Hey @rsuwa , sorry for the delayed response. I somehow missed this.
Yes. The environments support continuous actions. By default they are configured to use discrete actions as the V-Trace algorithm used in IMPALA supports only discrete actions.
You can start using continuous actions in two ways:
Creating a new environment (recommended & it's easy enough; Details are listed below)
Modifying existing environment (not-recommended but just needs a one word change)
One way to create a new environment is to simply copy and replicate an existing environment and change what you want and give it a new name. For example, to create a variation of this UrbanSignalIntersection3Car environment with continuous actions, you can copy this file, rename it (e.g.: urban_signal_intersection_3c_continuous.py) and edit the following line:
You can give this environment a new name (e.g.: UrbanSignalIntersection3CarContinuous) by registering this new environment with it's name like the existing discrete environment shown below:
Is it easy to change the action space from discrete to continuous to implement multi-agent DDPG?
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