Combined Arms
This environment is part of the magent environments. Please read that page first for general information.
| Name | Value |
|---|---|
| Actions | Discrete |
| Agents | 162 |
| Parallel API | Yes |
| Manual Control | No |
| Action Shape | (9),(25) |
| Action Values | Discrete(9),(25) |
| Observation Shape | (13,13,35), (13,13,51) |
| Observation Values | [0,2] |
| Import | pettingzoo.magent import combined_arms_v3 |
| Agents | agents= [redmelee_[0-44], redranged_[0-35], bluemelee_[0-44], blueranged_[0-35]] |
Agent Environment Cycle
Combined Arms
A large-scale team battle. Here there are two types of agents on each team, ranged units which can attack father and move faster but have less HP, and melee units which can only attack close units and move more slowly but have more HP. Unlike battle and battlefield, agents can attack units on their own team (they just are not rewarded for doing so). Agents slowly regain HP over time, so it is best to kill an opposing agent quickly. Specifically, agents have 10 HP, are damaged 2 HP by each attack, and recover 0.1 HP every turn.
Action Space
Key: move_N means N separate actions, one to move to each of the N nearest squares on the grid.
Melee action options: [do_nothing, move_4, attack_4]
Ranged action options: [do_nothing, move_12, attack_12]
Reward
Reward is given as:
- 5 reward for killing an opponent
- -0.005 reward every step (step_reward option)
- -0.1 reward for attacking (attack_penalty option)
- 0.2 reward for attacking an opponent (attack_opponent_reward option)
- -0.1 reward for dying (dead_penalty option)
If multiple options apply, rewards are added.
Observation space
The observation space is a 13x13 map with 35 channels for Melee and 51 channels for Ranged units, which are (in order):
| name | number of channels |
|---|---|
| obstacle/off the map | 1 |
| my_team_presence | 1 |
| my_team_hp | 1 |
| my_team_minimap | 1 |
| Other teams presences/heaths/minimaps (in some order) | 9 |
| binary_agent_id | 10 |
| one_hot_action | 9 Melee/25 ranged |
| last_reward | 1 |
| agent_position | 2 |
Arguments
combined_arms_v3.env(map_size=45, minimap_mode=True, step_reward=-0.005, dead_penalty=-0.1, attack_penalty=-0.1, attack_opponent_reward=0.2, max_cycles=1000)
map_size: Sets dimensions of the (square) map. Increasing the size increases the number of agents. Minimum size is 16.
minimap_mode: Turns on global minimap observations. These observations include your and your opponents piece densities binned over the 2d grid of the observation space. Also includes your agent_position, the absolute position on the map (rescaled from 0 to 1).
step_reward: reward after every step
dead_penalty: reward when killed
attack_penalty: reward when attacking anything
attack_opponent_reward: reward added for attacking an opponent
max_cycles: number of cycles (a step for each agent) until game terminates