The AEA gym skill demonstrates how a custom Reinforcement Learning agent, that uses OpenAI's gym library, may be embedded into an AEA skill and connection.
The gym skills demonstrate how to wrap a Reinforcement Learning agent in a skill.
The example decouples the RL agent from the
gym.Env allowing them to run in separate execution environments, potentially owned by different entities.
Create the AEA
First, fetch the gym AEA:
aea fetch fetchai/gym_aea:0.8.0 --alias my_gym_aea cd my_gym_aea aea install
Alternatively, create from scratch.
### Create the AEA In the root directory, create the gym AEA and enter the project.
aea create my_gym_aea cd my_gym_aea
aea add skill fetchai/gym:0.5.0
aea add connection fetchai/gym:0.5.0 aea config set agent.default_connection fetchai/gym:0.5.0
Set up the training environment
Copy the gym environment to the AEA directory
mkdir gyms cp -a ../examples/gym_ex/gyms/. gyms/
Update the connection config
aea config set vendor.fetchai.connections.gym.config.env 'gyms.env.BanditNArmedRandom'
Run the AEA with the gym connection
You will see the gym training logs.
Delete the AEA
When you're done, you can go up a level and delete the AEA.
cd .. aea delete my_gym_aea
This diagram shows the communication between the AEA and the gym environment
The skill consists of two core components:
setup method of the
GymTask is initialized, as well as its
execute methods called. The handler, which is registered against the
GymMessage.protocol_id then filters for messages of that protocol with the performative
GymMessage.Performative.PERCEPT. These messages are passed to the
proxy_env_queue of the task.
GymTask is responsible for training the RL agent. In particular,
MyRLAgent is initialized and trained against
ProxyEnv instantiates a
gym.Env class and therefore implements its API. This means the proxy environment is compatible with any
gym compatible RL agent. However, unlike other environments it only acts as a proxy and does not implement an environment of its own. It allows for the decoupling of the process environment of the
gym.env from the process environment of the RL agent. The actual
gym.env against which the agent is trained is wrapped by the
gym connection. The proxy environment and gym connection communicate via a protocol, the
gym protocol. Note, it would trivially be possible to implement the
gym environment in another AEA; this way one AEA could provide
gym environments as a service. Naturally, the overhead created by the introduction of the extra layers causes a higher latency when training the RL agent.
In this particular skill, which chiefly serves for demonstration purposes, we implement a very basic RL agent. The agent trains a model of price of
n goods: it aims to discover the most likely price of each good. To this end, the agent randomly selects one of the
n goods on each training step and then chooses as an
action the price which it deems is most likely accepted. Each good is represented by an id and the possible price range
[1,100] divided into 100 integer bins. For each price bin, a
PriceBandit is created which models the likelihood of this price. In particular, a price bandit maintains a beta distribution. The beta distribution is initialized to the uniform distribution. Each time the price associated with a given
PriceBandit is accepted or rejected the distribution maintained by the
PriceBandit is updated. For each good, the agent can therefore over time learn which price is most likely.
The illustration shows how the RL agent only interacts with the proxy environment by sending it
action (A) and receiving
done (D) and