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86 lines
3.7 KiB
Markdown
86 lines
3.7 KiB
Markdown
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---
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title: Air Raid
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---
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# Air Raid
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```{figure} ../../_static/videos/atari/air_raid.gif
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:width: 120px
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:name: air_raid
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```
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This environment is part of the <a href='..'>Atari environments</a>. Please read that page first for general information.
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|---|---|
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| Action Space | Discrete(18) |
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| Observation Space | (250, 160, 3) |
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| Observation High | 255 |
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| Observation Low | 0 |
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| Import | `gymnasium.make("ALE/AirRaid-v5")` |
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### Description
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You control a ship that can move sideways. You must protect two buildings (one on the right and one on the left side of the screen) from
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flying saucers that are trying to drop bombs on them.
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### Actions
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By default, all actions that can be performed on an Atari 2600 are available in this environment.
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However, if you use v0 or v4 or specify `full_action_space=False` during initialization, only a reduced
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number of actions (those that are meaningful in this game) are available. The reduced action space may depend
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on the flavor of the environment (the combination of `mode` and `difficulty`). The reduced action space for the default
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flavor looks like this:
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| Num | Action |
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|-----|------------------------|
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| 0 | NOOP |
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| 1 | FIRE |
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| 2 | RIGHT |
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| 3 | LEFT |
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| 4 | RIGHTFIRE |
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| 5 | LEFTFIRE |
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### Observations
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By default, the environment returns the RGB image that is displayed to human players as an observation. However, it is
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possible to observe
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- The 128 Bytes of RAM of the console
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- A grayscale image
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instead. The respective observation spaces are
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- `Box([0 ... 0], [255 ... 255], (128,), uint8)`
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- `Box([[0 ... 0]
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...
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[0 ... 0]], [[255 ... 255]
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...
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[255 ... 255]], (250, 160), uint8)
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`
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respectively. The general article on Atari environments outlines different ways to instantiate corresponding environments
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via `gymnasium.make`.
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### Arguments
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```
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env = gymnasium.make("ALE/AirRaid-v5")
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```
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The various ways to configure the environment are described in detail in the article on Atari environments.
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It is possible to specify various flavors of the environment via the keyword arguments `difficulty` and `mode`.
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A flavor is a combination of a game mode and a difficulty setting.
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| Environment | Valid Modes | Valid Difficulties | Default Mode |
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|------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------|--------------|
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| AirRaid | `[1, ..., 8]` | `[0]` | `1` |
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You may use the suffix "-ram" to switch to the RAM observation space. In v0 and v4, the suffixes "Deterministic" and "NoFrameskip"
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are available. These are no longer supported in v5. In order to obtain equivalent behavior, pass keyword arguments to `gymnasium.make` as outlined in
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the general article on Atari environments.
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The versions v0 and v4 are not contained in the "ALE" namespace. I.e. they are instantiated via `gymnasium.make("AirRaid-v0")`.
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### Version History
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A thorough discussion of the intricate differences between the versions and configurations can be found in the
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general article on Atari environments.
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* v5: Stickiness was added back and stochastic frameskipping was removed. The entire action space is used by default. The environments are now in the "ALE" namespace.
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* v4: Stickiness of actions was removed
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* v0: Initial versions release (1.0.0)
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