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title
| title |
|---|
| JourneyEscape |
JourneyEscape
:width: 120px
:name: JourneyEscape
This environment is part of the Atari environments. Please read that page first for general information.
| Action Space | Discrete(16) |
| Observation Shape | (230, 160, 3) |
| Observation High | 255 |
| Observation Low | 0 |
| Import | gymnasium.make("ALE/JourneyEscape-v5") |
For more JourneyEscape variants with different observation and action spaces, see the variants section.
Description
You must lead all 5 members of JOURNEY through waves of pesky characters and backstage obstacles to the Scarab Escape Vehicle before time runs out.You must also protect $50,000 in concert cash from grasping groupies, photographers, and promoters.
For a more detailed documentation, see the AtariAge page
Actions
JourneyEscape has the action space Discrete(16) with the table below lists the meaning of each action's meanings.
As JourneyEscape uses a reduced set of actions for v0, v4 and v5 versions of the environment.
To enable all 18 possible actions that can be performed on an Atari 2600, specify full_action_space=True during
initialization or by passing full_action_space=True to gymnasium.make.
| Value | Meaning | Value | Meaning | Value | Meaning |
|---|---|---|---|---|---|
0 |
NOOP |
1 |
UP |
2 |
RIGHT |
3 |
LEFT |
4 |
DOWN |
5 |
UPRIGHT |
6 |
UPLEFT |
7 |
DOWNRIGHT |
8 |
DOWNLEFT |
9 |
RIGHTFIRE |
10 |
LEFTFIRE |
11 |
DOWNFIRE |
12 |
UPRIGHTFIRE |
13 |
UPLEFTFIRE |
14 |
DOWNRIGHTFIRE |
15 |
DOWNLEFTFIRE |
Observations
Atari environment have two possible observation types, the observation space is listed below. See variants section for the type of observation used by each environment id.
obs_type="rgb" -> observation_space=Box(0, 255, (210, 160, 3), np.uint8)obs_type="ram" -> observation_space=Box(0, 255, (128,), np.uint8)
Additionally, obs_type="grayscale" cause the environment return a grayscale version of the rgb array for observations with the observation space being Box(0, 255, (210, 160), np.uint8)
Rewards
At the start of the game, you will have $50,000 and 60 units of time. Your end game score with be dependent on how much time you have remaining and who you encounter along the way. For a more detailed documentation, consult the AtariAge page.
Variants
JourneyEscape has the following variants of the environment id which have the following differences in observation, the number of frame-skips and the repeat action probability.
| Env-id | obs_type= | frameskip= | repeat_action_probability= |
|---|---|---|---|
| JourneyEscape-v0 | "rgb" |
(2, 5) |
0.25 |
| JourneyEscape-ram-v0 | "ram" |
(2, 5) |
0.25 |
| JourneyEscape-ramDeterministic-v0 | "ram" |
4 |
0.25 |
| JourneyEscape-ramNoFrameskip-v0 | "ram" |
1 |
0.25 |
| JourneyEscapeDeterministic-v0 | "rgb" |
4 |
0.25 |
| JourneyEscapeNoFrameskip-v0 | "rgb" |
1 |
0.25 |
| JourneyEscape-v4 | "rgb" |
(2, 5) |
0.0 |
| JourneyEscape-ram-v4 | "ram" |
(2, 5) |
0.0 |
| JourneyEscape-ramDeterministic-v4 | "ram" |
4 |
0.0 |
| JourneyEscape-ramNoFrameskip-v4 | "ram" |
1 |
0.0 |
| JourneyEscapeDeterministic-v4 | "rgb" |
4 |
0.0 |
| JourneyEscapeNoFrameskip-v4 | "rgb" |
1 |
0.0 |
| ALE/JourneyEscape-v5 | "rgb" |
4 |
0.25 |
| ALE/JourneyEscape-ram-v5 | "ram" |
4 |
0.25 |
Difficulty and modes
It is possible to specify various flavors of the environment via the keyword arguments difficulty and mode.
A flavor is a combination of a game mode and a difficulty setting. The table below lists the possible difficulty and mode values
along with the default values.
| Available Modes | Default Mode | Available Difficulties | Default Difficulty |
|---|---|---|---|
[0] |
0 |
[0, 1] |
0 |
Version History
A thorough discussion of the intricate differences between the versions and configurations can be found in the general article on Atari environments.
- v5: Stickiness was added back and stochastic frameskipping was removed. The environments are now in the "ALE" namespace.
- v4: Stickiness of actions was removed
- v0: Initial versions release