multiple DQN trained agents for a single environment

[indhra]

@blavad thanks for the huge repo

hi i have a query

i would like to train two agents with DQN of same environment, but independent of them (agents) is it possible, if so help me out

thanks for the huge repo

[indhra]

its kind of competitive between agent A vs agent B of same environment

[blavad]

Hi @indhra007 . Indeed it is totally possible to train two independant agents with DQN algorithm. All you have to do is to :

1. Instantiate your OpenAI Gym like environment and get observation and action space for both agents (if they have different observation and/or action space)

   
   import marl
   from marl.agent import DQNAgent

env = my_env()

This part may depend of the implementation of the environment

obs_space1 = env.observation_space[0] act_space1 = env.action_space[0]

obs_space2 = env.observation_space[1] act_space2 = env.action_space[1]

2. Instantiate two DQNAgent with the best training parameters for each. Easiest way to do (with neither custom parameters nor custom model) is as follow:
```python
agent1 = DQNAgent("MlpNet", obs_space1, act_space1)
print("#> Agent 1 :\n", agent1, "\n")

agent2 = DQNAgent("MlpNet", obs_space2, act_space2)
print("#> Agent 2 :\n", agent2, "\n")

3. Instantiate your multi-agent system for reinforcement learning. If the agents are independant learners, you don't need to use set_mas() function because it means that they don't need to know local information about other agents (i.e. policies of other agents):

   mas = MARL(agents_list=[agent1, agent2])

4. Train and test your system

   
   # Train the agent for 100 000 timesteps
   mas.learn(env, nb_timesteps=100000)

Test the agent for 10 episodes

mas.test(env, nb_episodes=10)

I hope this will help you. I continue to implement some module for this API and I hope I will have time 
to improve the documentation in order to provide more usefull examples. 

[indhra]

@blavad thanks for quick reply

If possible can u share an environment which has multi agents-with some documentation

[blavad]

@indhra007 sorry for the late answer. In order to avoid problems of importing packages when using notebook, go to the marl directory before installing it. If you are using a Notebook or Google Colab, the following lines should fix the problem:

!git clone https://github.com/blavad/marl.git
%cd marl
!pip install -e .

or

!git clone https://github.com/blavad/marl.git
!cd marl
!pip install -e .

If you are using command line, something as follow should work:

git clone https://github.com/blavad/marl.git
cd marl
pip install -e .

[indhra]

@blavad Any multi agent environment other than soccer, Because of no soccer documentation it is not possible to understand

[blavad]

@indhra007 For the moment I cannot share another well documented environment. I am currently working with another environment (for the game Hanabi) but it is not online yet. You can check to this section of the documentation (https://blavad.github.io/marl/html/quickstart/environment.html) for a brief review of how to build an adequate environment.

I will let you know as soon as I make a repo with some multi-agent environments.

[indhra]

Ok Does the soccer environment works?