color-memory-maze 1.1.0

Memory Maze environments with DrStrategy enhancements for reinforcement learning research

Memory Maze DrStrategy Environments

Goal-conditioned maze navigation environments adapted from Memory-Maze with visual enhancements from DrStrategy.

Environments

7×7 Complex Maze	15×15 Complex Maze

Environment ID	Grid	Episode Steps	Description
MemoryMaze-cmaze-7x7-drstrategy-v0	7×7	500	Compact complex maze with colorful textures
MemoryMaze-cmaze-15x15-drstrategy-v0	15×15	1000	Large complex maze with colorful textures

API

Observation Space (Dict)

The observation is a gymnasium.spaces.Dict with five keys:

Key	Shape	Dtype	Description
image	(64, 64, 3)	uint8	First-person egocentric camera (HWC)
goal_image	(64, 64, 3)	uint8	Pre-rendered image of the current goal location
target_color	(3,)	float64	Goal sphere colour, RGB in [0, 1]
position	(2,)	float64	Agent position in maze coordinates
direction	(2,)	float64	Agent heading unit vector

Action Space

Continuous gymnasium.spaces.Box(shape=(2,)):

Index	Meaning
action[0]	Forward (negative) / Backward (positive)
action[1]	Turn left (negative) / Turn right (positive)

Reward and Info

• Reward: 1.0 when the goal is reached, 0.0 otherwise (sparse)
• info["success"]: 1 on the step the goal is reached, 0 otherwise
• info["distance"]: L1 distance to the current goal

Features

• Colorful wall textures using the tab20 colormap, unique per maze section
• Colorful floor textures using block-based tab20 colours
• Goal-conditioned navigation: goal_image provides a pre-rendered first-person view from the target location
• 20 distinct target sphere colours
• Physics-based agent (rolling ball with friction)
• Fixed maze layouts for reproducible experiments

Usage

Basic Example

import gymnasium as gym
import memory_maze

env = gym.make("MemoryMaze-cmaze-7x7-drstrategy-v0")
obs, info = env.reset()

for _ in range(500):
    action = env.action_space.sample()
    obs, reward, terminated, truncated, info = env.step(action)

    if terminated or truncated:
        obs, info = env.reset()

env.close()

Rendering Backend

Set the MUJOCO_GL environment variable before running:

export MUJOCO_GL=egl     # Hardware-accelerated (recommended)
export MUJOCO_GL=osmesa  # Software rendering for headless servers

Examples

• examples/keyboard_control.py — Interactive 3-panel matplotlib window (obs / goal_image / top-down view), controlled with WASD keys
• examples/save_observations_with_goals.py — Saves observations, all pre-rendered goal images, and the top-down view to disk

Installation

From Source

pip install -e .

Rendering Setup

export MUJOCO_GL=egl     # GPU systems
export MUJOCO_GL=osmesa  # Headless / CPU-only

Verify

import gymnasium as gym
import memory_maze

env = gym.make("MemoryMaze-cmaze-7x7-drstrategy-v0")
obs, info = env.reset()
print(obs["image"].shape)   # (64, 64, 3)
print(env.action_space)     # Box(-inf, inf, (2,), float64)
env.close()

Development

Code formatting uses black, isort, and ruff (configured in pyproject.toml). Run tests with pytest.