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 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