gym-tetris 2.2.2

Tetris (NES) for OpenAI Gym

gym-tetris

An OpenAI Gym environment for Tetris on The Nintendo Entertainment System (NES) based on the nes-py emulator.

Installation

The preferred installation of gym-tetris is from pip:

pip install gym-tetris

Usage

Python

You must import gym_tetris before trying to make an environment. This is because gym environments are registered at runtime. By default, gym_tetris environments use the full NES action space of 256 discrete actions. To constrain this, gym_tetris.actions provides an action list called MOVEMENT (20 discrete actions) for the nes_py.wrappers.BinarySpaceToDiscreteSpaceEnv wrapper. There is also SIMPLE_MOVEMENT with a reduced action space (6 actions). For exact details, see gym_tetris/actions.py.

from nes_py.wrappers import BinarySpaceToDiscreteSpaceEnv
import gym_tetris
from gym_tetris.actions import MOVEMENT

env = gym_tetris.make('Tetris-v0')
env = BinarySpaceToDiscreteSpaceEnv(env, MOVEMENT)

done = True
for step in range(5000):
    if done:
        state = env.reset()
    state, reward, done, info = env.step(env.action_space.sample())
    env.render()

env.close()

NOTE: gym_tetris.make is just an alias to gym.make for convenience.

NOTE: remove calls to render in training code for a nontrivial speedup.

Command Line

gym_tetris features a command line interface for playing environments using either the keyboard, or uniform random movement.

gym_tetris -e <`Tetris-v0` or `Tetris-v1`> -m <`human` or `random`>

Environments

Environment	Reward function
Tetris-v0	Instantaneous change in score
Tetris-v1	The change in Number of lines cleared

info dictionary

The info dictionary returned by the step method contains the following keys:

Key	Type	Description
current_piece	str	the current piece as a string
number_of_lines	int	the number of cleared lines
score	int	the current score of the game
next_piece	str	the next piece on deck
statistics	dict	statistics for each piece

Citation

Please cite gym-tetris if you use it in your research.

@misc{gym-tetris,
  author = {Christian Kauten},
  title = {{Tetris (NES)} for {OpenAI Gym}},
  year = {2019},
  publisher = {GitHub},
  howpublished = {\url{https://github.com/Kautenja/gym-tetris}},
}

References

The following references contributed to the construction of this project.

1. Tetris (NES): RAM Map. Data Crystal ROM Hacking.
2. Tetris: Memory Addresses. NES Hacker.
3. Applying Artificial Intelligence to Nintendo Tetris. MeatFighter.