--- title: Assault --- # Assault ```{figure} ../../_static/videos/atari/assault.gif :width: 120px :name: Assault ``` This environment is part of the Atari environments. Please read that page first for general information. | | | |---|---| | Action Space | Discrete(7) | | Observation Space | Box(0, 255, (210, 160, 3), uint8) | | Import | `gymnasium.make("ALE/Assault-v5")` | For more Assault variants with different observation and action spaces, see the variants section. ## Description You control a vehicle that can move sideways. A big mother ship circles overhead and continually deploys smaller drones. You must destroy these enemies and dodge their attacks. For a more detailed documentation, see [the AtariAge page](https://atariage.com/manual_html_page.php?SoftwareID=827) ## Actions Assault has the action space of `Discrete(7)` 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` | `FIRE` | `2` | `UP` | | `3` | `RIGHT` | `4` | `LEFT` | `5` | `RIGHTFIRE` | | `6` | `LEFTFIRE` | | | | | ## 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. ## Variants Assault 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= | |-----------------------------|-------------|--------------|------------------------------| | Assault-v0 | `"rgb"` | `(2, 5)` | `0.25` | | Assault-ram-v0 | `"ram"` | `(2, 5)` | `0.25` | | Assault-ramDeterministic-v0 | `"ram"` | `4` | `0.25` | | Assault-ramNoFrameskip-v0 | `"ram"` | `1` | `0.25` | | AssaultDeterministic-v0 | `"rgb"` | `4` | `0.25` | | AssaultNoFrameskip-v0 | `"rgb"` | `1` | `0.25` | | Assault-v4 | `"rgb"` | `(2, 5)` | `0.0` | | Assault-ram-v4 | `"ram"` | `(2, 5)` | `0.0` | | Assault-ramDeterministic-v4 | `"ram"` | `4` | `0.0` | | Assault-ramNoFrameskip-v4 | `"ram"` | `1` | `0.0` | | AssaultDeterministic-v4 | `"rgb"` | `4` | `0.0` | | AssaultNoFrameskip-v4 | `"rgb"` | `1` | `0.0` | | ALE/Assault-v5 | `"rgb"` | `4` | `0.25` | | ALE/Assault-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]` | `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