JourneyEscape

../../../_images/journey_escape.gif

This environment is part of the Atari environments. Please read that page first for general information.

Action Space

Discrete(16)

Observation Space

Box(0, 255, (230, 160, 3), uint8)

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 of Discrete(16) with the table below listing the meaning of each action’s meanings. 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 environments have three possible observation types: "rgb", "grayscale" and "ram".

  • obs_type="rgb" -> observation_space=Box(0, 255, (210, 160, 3), np.uint8)

  • obs_type="ram" -> observation_space=Box(0, 255, (128,), np.uint8)

  • obs_type="grayscale" -> Box(0, 255, (210, 160), np.uint8), a grayscale version of the “rgb” type

See variants section for the type of observation used by each environment id by default.

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