[Feature Request] A2C

[vmoens]

Implement A2C algorithm as presented here

[barlowtwin]

can i solve this issue and send a PR ?

[vmoens]

Of course, any contribution is welcome!
It's probably a bit tedious as a first task but why not :)
We'd need the following things

• a training script in examples/a2c/a2c.py
• a dedicated loss function (if no other can be used)
• helper functions to make the model and build the loss function
  Don't hesitate to reach out if you need help!

[vwxyzjn]

Hello, it's probably not necessary to implement A2C because A2C is a special case of PPO - see our preprint at https://arxiv.org/abs/2205.09123.

In SB3, we can configure PPO to obtain the exact same model parameters as A2C after other settings such as seeds are controlled, regardless of the simulation environment tested.