Rock Paper Scissors
This environment is part of the classic environments. Please read that page first for general information.
| Name | Value |
|---|---|
| Actions | Discrete |
| Agents | 2 |
| Parallel API | Yes |
| Manual Control | No |
| Action Shape | Discrete(3) |
| Action Values | Discrete(3) |
| Observation Shape | Discrete(4) |
| Observation Values | Discrete(4) |
| Import | from pettingzoo.classic import rps_v1 |
| Agents | agents= ['player_0', 'player_1'] |
Agent Environment Cycle
Rock Paper Scissors
Rock, Paper, Scissors is a 2-player hand game where each player chooses either rock, paper or scissors and reveals their choices simultaneously. If both players make the same choice, then it is a draw. However, if their choices are different, the winner is determined as follows: rock beats scissors, scissors beat paper, and paper beats rock.
Observation Space
The observation is the last oppoent action and its space is a scalar value with 4 possible values. Since both players reveal their choices at the same time, the observation is None until both players have acted. Therefore, 3 represents no action taken yet. Rock is represented with 0, paper with 1 and scissors with 2.
| Value | Observation |
|---|---|
| 0 | Rock |
| 1 | Paper |
| 2 | Scissors |
| 3 | None |
Action Space
The action space is a scalar value with 3 possible values. The values are encoded as follows: Rock is 0, paper is 1 and scissors is 2.
| Value | Action |
|---|---|
| 0 | Rock |
| 1 | Paper |
| 2 | Scissors |
Rewards
| Winner | Loser |
|---|---|
| +1 | -1 |
If the game ends in a draw, both players will receive a reward of 0.