habitat.core.simulator.Simulator class

Basic simulator class for habitat. New simulators to be added to habtiat must derive from this class and implement the abstarct methods.

Reference

Methods

def action_space_shortest_path(self, source: AgentState, targets: typing.List[AgentState], agent_id: int = 0) -> typing.List[ShortestPathPoint]: Calculates the shortest path between source and target agent states.
def close(self) -> None
def geodesic_distance(self, position_a: typing.List[float], position_b: typing.Union[typing.List[float], typing.List[typing.List[float]]], episode: typing.Optional[dataset.Episode] = None) -> float: Calculates geodesic distance between two points.
def get_agent_state(self, agent_id: int = 0)
def get_observations_at(self, position: typing.List[float], rotation: typing.List[float], keep_agent_at_new_pose: bool = False) -> typing.Optional[Observations]: Returns the observation.
def get_straight_shortest_path_points(self, position_a: typing.List[float], position_b: typing.List[float]) -> typing.List[typing.List[float]]: Returns points along the geodesic (shortest) path between two points irrespective of the angles between the waypoints.
def is_navigable(self, point: typing.List[float]) -> bool: Return True if the agent can stand at the specified point.
def previous_step_collided(self) -> bool: Whether or not the previous step resulted in a collision
def reconfigure(self, config: habitat.config.default.Config) -> None
def render(self, mode: str = 'rgb') -> typing.Any
def reset(self) -> Observations: resets the simulator and returns the initial observations.
def sample_navigable_point(self) -> typing.List[float]: Samples a navigable point from the simulator. A point is defined as navigable if the agent can be initialized at that point.
def seed(self, seed: int) -> None
def step(self, action, *args, **kwargs) -> Observations: Perform an action in the simulator and return observations.

Special methods

def __enter__(self)
def __exit__(self, exc_type, exc_val, exc_tb)

Properties

action_space: gym.core.Space get
forward_vector get: The forward direction in the global coordinate frame i.e. the direction of forward movement for an agent with 0 degrees rotation in the ground plane.
sensor_suite: SensorSuite get
up_vector get: The vector representing the direction upward (perpendicular to the floor) from the global coordinate frame.

Data

habitat_config: habitat.config.default.Config = None

Method documentation

def habitat.core.simulator.Simulator.action_space_shortest_path(self, source: AgentState, targets: typing.List[AgentState], agent_id: int = 0) -> typing.List[ShortestPathPoint]

Calculates the shortest path between source and target agent states.

Parameters
source	source agent state for shortest path calculation.
targets	target agent state(s) for shortest path calculation.
agent_id	id for agent (relevant for multi-agent setup).
Returns	list of agent states and actions along the shortest path from source to the nearest target (both included).

def habitat.core.simulator.Simulator.geodesic_distance(self, position_a: typing.List[float], position_b: typing.Union[typing.List[float], typing.List[typing.List[float]]], episode: typing.Optional[dataset.Episode] = None) -> float

Calculates geodesic distance between two points.

Parameters
position_a	coordinates of first point.
position_b	coordinates of second point or list of goal points coordinates.
episode	The episode with these ends points. This is used for shortest path computation caching
Returns	the geodesic distance in the cartesian space between points `position_a` and `position_b`, if no path is found between the points then math.inf is returned.

def habitat.core.simulator.Simulator.get_agent_state(self, agent_id: int = 0)

Parameters
agent_id	id of agent.
Returns	state of agent corresponding to `agent_id`.

def habitat.core.simulator.Simulator.get_observations_at(self, position: typing.List[float], rotation: typing.List[float], keep_agent_at_new_pose: bool = False) -> typing.Optional[Observations]

Returns the observation.

Parameters
position	list containing 3 entries for `(x, y, z)`.
rotation	list with 4 entries for `(x, y, z, w)` elements of unit quaternion (versor) representing agent 3D orientation, (https://en.wikipedia.org/wiki/Versor)
keep_agent_at_new_pose	If true, the agent will stay at the requested location. Otherwise it will return to where it started.
Returns	The observations or `None` if it was unable to get valid observations.

def habitat.core.simulator.Simulator.get_straight_shortest_path_points(self, position_a: typing.List[float], position_b: typing.List[float]) -> typing.List[typing.List[float]]

Returns points along the geodesic (shortest) path between two points irrespective of the angles between the waypoints.

Parameters
position_a	the start point. This will be the first point in the returned list.
position_b	the end point. This will be the last point in the returned list.
Returns	a list of waypoints `(x, y, z)` on the geodesic path between the two points.

def habitat.core.simulator.Simulator.is_navigable(self, point: typing.List[float]) -> bool

Return True if the agent can stand at the specified point.

Parameters
point	the point to check.

def habitat.core.simulator.Simulator.previous_step_collided(self) -> bool

Whether or not the previous step resulted in a collision

Returns	`True` if the previous step resulted in a collision, `False` otherwise

def habitat.core.simulator.Simulator.reset(self) -> Observations

resets the simulator and returns the initial observations.

Returns	initial observations from simulator.

def habitat.core.simulator.Simulator.sample_navigable_point(self) -> typing.List[float]

Samples a navigable point from the simulator. A point is defined as navigable if the agent can be initialized at that point.

Returns	navigable point.

def habitat.core.simulator.Simulator.step(self, action, *args, **kwargs) -> Observations

Perform an action in the simulator and return observations.

Parameters
action	action to be performed inside the simulator.
args
kwargs
Returns	observations after taking action in simulator.