Data Association
- class stonesoup.dataassociator.base.DataAssociator(hypothesiser: Hypothesiser)[source]
Bases:
Base
Data Associator base class
A data associator is used to associate tracks and detections, and may also include an association of a missed detection. The associations generate are in the form a mapping each track to a hypothesis, based on “best” choice from hypotheses generate from a
Hypothesiser
.- Parameters:
hypothesiser (
Hypothesiser
) – Generate a set of hypotheses for each track-detection pair
- hypothesiser: Hypothesiser
Generate a set of hypotheses for each track-detection pair
- abstract associate(tracks: Set[Track], detections: Set[Detection], timestamp: datetime, **kwargs) Mapping[Track, Hypothesis] [source]
Associate tracks and detections
- Parameters:
tracks (set of
Track
) – Tracks which detections will be associated to.detections (set of
Detection
) – Detections to be associated to tracks.timestamp (datetime.datetime) – Timestamp to be used for missed detections and to predict to.
- Returns:
Mapping of track to Hypothesis
- Return type:
mapping of
Track
:Hypothesis
- class stonesoup.dataassociator.base.Associator[source]
Bases:
Base
Associator base class
An associator is used to associate objects for the generation of metrics. It returns an
AssociationSet
containing a set ofAssociation
objects.
- class stonesoup.dataassociator.base.TrackToTrackAssociator[source]
Bases:
Associator
Associates n sets of
Track
objects together- abstract associate_tracks(*tracks_sets: Set[Track]) AssociationSet [source]
Associate n sets of tracks together.
- Parameters:
tracks_sets (n sets of
Track
objects) – Tracks to associate to other track sets- Returns:
Contains a set of
Association
objects- Return type:
- associated_and_unassociated_tracks(*tracks_sets: Set[Track]) Tuple[AssociationSet, Tuple[Set[Track]]] [source]
- Associate n sets of tracks together. The unassociated tracks are returned with
the associated tracks.
- Parameters:
tracks_sets (n sets of
Track
objects) – Tracks to associate to other track sets- Returns:
AssociationSet – Contains a set of
Association
objectsTuple – n sets of tracks (that were input variables) minus any associated tracks
- class stonesoup.dataassociator.base.TwoTrackToTrackAssociator[source]
Bases:
TrackToTrackAssociator
Associates two sets of
Track
objects together- abstract associate_tracks(tracks_set_1: Set[Track], tracks_set_2: Set[Track]) AssociationSet [source]
Associate two sets of tracks together.
- Parameters:
- Returns:
Contains a set of
Association
objects- Return type:
General Association
- class stonesoup.dataassociator.general.OneToOneAssociator(measure: BaseMeasure, association_threshold: float = None, maximise_measure: bool = False)[source]
Bases:
Associator
This a general one to one associator. It can be used to associate objects/values that have a
BaseMeasure
to compare them. Useslinear_sum_assignment()
to find the minimum (or maximum) measure by combination objects from two sources.Notes
As default the association threshold is set to +- a large number (1e10 was chosen arbitrarily). Infinity can’t be used, as it breaks the association algorithm.
- Parameters:
measure (
BaseMeasure
) – This will compare two objects that could be associated together and will provide an indication of the separation between the objects.association_threshold (
float
, optional) – The maximum (minimum ifmaximise_measure
is true) value from themeasure
needed to associate two objects. If the default value of None is used then the association threshold is set to plus/minus an arbitrarily large number that shouldn’t limit associations.maximise_measure (
bool
, optional) – Should the association algorithm attempt to maximise or minimise the output of the measure.
- measure: BaseMeasure
This will compare two objects that could be associated together and will provide an indication of the separation between the objects.
- maximise_measure: bool
Should the association algorithm attempt to maximise or minimise the output of the measure.
- association_threshold: float
The maximum (minimum if
maximise_measure
is true) value from themeasure
needed to associate two objects. If the default value of None is used then the association threshold is set to plus/minus an arbitrarily large number that shouldn’t limit associations.
- associate(objects_a: Collection, objects_b: Collection) Tuple[AssociationSet, Collection, Collection] [source]
Associate two collections of objects together. Calculate the measure between each object.
linear_sum_assignment()
is used to find the minimum (or maximum) measure by combination objects from two sources.- Parameters:
objects_a (collection of objects to associate to the objects in objects_b)
objects_b (collection of objects to associate to the objects in objects_a)
- Returns:
Contains a set of
Association
objects- Return type:
- property fail_value
For an association to be valid is must be over (or under if maximise_measure is True) (non-inclusive). Therefore setting the value to the association threshold will result in the association not taking place.
- individual_weighting(a, b)[source]
This wrapper around the measure function allows for filtering/error checking of the measure function. It can give an easy access point for subclasses that want to apply additional filtering or gating.
- association_dict(objects_a: Collection, objects_b: Collection) dict [source]
This is a wrapper function around the
associate()
function. The two collections of objects are associated to each other. The objects are entered into a dictionary:The dictionary key is an object from either collection.
The value is the object it is associated to. If the key object isn’t associated to an object then the value is None.
As the objects are used as dictionary keys, they must be hashable or a
TypeError
will be raised.- Parameters:
objects_a (collection of hashable objects to associate to the objects in
objects_b
)objects_b (collection of hashable objects to associate to the objects in
objects_a
)
- Returns:
Contains a set of
Association
objects- Return type:
Neighbour
- class stonesoup.dataassociator.neighbour.NearestNeighbour(hypothesiser: Hypothesiser)[source]
Bases:
DataAssociator
Nearest Neighbour Associator
Scores and associates detections to a predicted state using the Nearest Neighbour method.
- Parameters:
hypothesiser (
Hypothesiser
) – Generate a set of hypotheses for each prediction-detection pair
- hypothesiser: Hypothesiser
Generate a set of hypotheses for each prediction-detection pair
- associate(tracks, detections, timestamp, **kwargs)[source]
Associate tracks and detections
- Parameters:
tracks (set of
Track
) – Tracks which detections will be associated to.detections (set of
Detection
) – Detections to be associated to tracks.timestamp (datetime.datetime) – Timestamp to be used for missed detections and to predict to.
- Returns:
Mapping of track to Hypothesis
- Return type:
mapping of
Track
:Hypothesis
- class stonesoup.dataassociator.neighbour.GlobalNearestNeighbour(hypothesiser: Hypothesiser)[source]
Bases:
DataAssociator
Global Nearest Neighbour Associator
Scores and associates detections to a predicted state using the Global Nearest Neighbour method, assuming a distance-based hypothesis score.
- Parameters:
hypothesiser (
Hypothesiser
) – Generate a set of hypotheses for each prediction-detection pair
- hypothesiser: Hypothesiser
Generate a set of hypotheses for each prediction-detection pair
- associate(tracks, detections, timestamp, **kwargs)[source]
Associate tracks and detections
- Parameters:
tracks (set of
Track
) – Tracks which detections will be associated to.detections (set of
Detection
) – Detections to be associated to tracks.timestamp (datetime.datetime) – Timestamp to be used for missed detections and to predict to.
- Returns:
Mapping of track to Hypothesis
- Return type:
mapping of
Track
:Hypothesis
- static isvalid(joint_hypothesis)[source]
Determine whether a joint_hypothesis is valid.
Check the set of hypotheses that define a joint hypothesis to ensure a single detection is not associated to more than one track.
- Parameters:
joint_hypothesis (
JointHypothesis
) – A set of hypotheses linking each prediction to a single detection- Returns:
Whether joint_hypothesis is a valid set of hypotheses
- Return type:
- classmethod enumerate_joint_hypotheses(hypotheses)[source]
Enumerate the possible joint hypotheses.
Create a list of all possible joint hypotheses from the individual hypotheses and determine whether each is valid.
- Parameters:
hypotheses (dict of
Track
:Hypothesis
) – A list of all hypotheses linking predictions to detections, including missed detections- Returns:
joint_hypotheses – A list of all valid joint hypotheses with a score on each
- Return type:
list of
JointHypothesis
- class stonesoup.dataassociator.neighbour.GNNWith2DAssignment(hypothesiser: Hypothesiser)[source]
Bases:
DataAssociator
Global Nearest Neighbour Associator
Associates detections to a predicted state using the Global Nearest Neighbour method, utilising a 2D matrix of distances and a “shortest path” assignment algorithm.
- Parameters:
hypothesiser (
Hypothesiser
) – Generate a set of hypotheses for each prediction-detection pair
- hypothesiser: Hypothesiser
Generate a set of hypotheses for each prediction-detection pair
- associate(tracks, detections, timestamp, **kwargs)[source]
Associate a set of detections with predicted states.
- Parameters:
tracks (set of
Track
) – Current tracked objectsdetections (set of
Detection
) – Retrieved measurementstimestamp (datetime.datetime) – Detection time to predict to
- Returns:
Key value pair of tracks with associated detection
- Return type:
Probability
- class stonesoup.dataassociator.probability.PDA(hypothesiser: Hypothesiser)[source]
Bases:
DataAssociator
Probabilistic Data Association (PDA)
Given a set of detections and a set of tracks, each track has a probability that it is associated to each specific detection.
- Parameters:
hypothesiser (
Hypothesiser
) – Generate a set of hypotheses for each prediction-detection pair
- hypothesiser: Hypothesiser
Generate a set of hypotheses for each prediction-detection pair
- associate(tracks, detections, timestamp, **kwargs)[source]
Associate tracks and detections
- Parameters:
tracks (set of
Track
) – Tracks which detections will be associated to.detections (set of
Detection
) – Detections to be associated to tracks.timestamp (datetime.datetime) – Timestamp to be used for missed detections and to predict to.
- Returns:
Mapping of track to Hypothesis
- Return type:
mapping of
Track
:Hypothesis
- class stonesoup.dataassociator.probability.JPDA(hypothesiser: PDAHypothesiser)[source]
Bases:
DataAssociator
Joint Probabilistic Data Association (JPDA)
Given a set of Detections and a set of Tracks, each Detection has a probability that it is associated with each specific Track. Rather than associate specific Detections/Tracks, JPDA calculates the new state of a Track based on its possible association with ALL Detections. The new state is a Gaussian Mixture, reduced to a single Gaussian. If
\[prob_{association(Detection, Track)} < \frac{prob_{association(MissedDetection, Track)}}{gate\ ratio}\]then Detection is assumed to be outside Track’s gate, and the probability of association is dropped from the Gaussian Mixture. This calculation takes place in the function
enumerate_JPDA_hypotheses()
.- Parameters:
hypothesiser (
PDAHypothesiser
) – Generate a set of hypotheses for each prediction-detection pair
- hypothesiser: PDAHypothesiser
Generate a set of hypotheses for each prediction-detection pair
- associate(tracks, detections, timestamp, **kwargs)[source]
Associate tracks and detections
- Parameters:
tracks (set of
Track
) – Tracks which detections will be associated to.detections (set of
Detection
) – Detections to be associated to tracks.timestamp (datetime.datetime) – Timestamp to be used for missed detections and to predict to.
- Returns:
Mapping of track to Hypothesis
- Return type:
mapping of
Track
:Hypothesis
Track-to-track Association
- class stonesoup.dataassociator.tracktotrack.TrackToTrackCounting(association_threshold: float, consec_pairs_confirm: int = 3, consec_misses_end: int = 2, measure: Measure = None, pos_map: list = None, use_positional_only: bool = True, position_weighting: float = 0.6, one_to_one: bool = False)[source]
Bases:
TwoTrackToTrackAssociator
Track to track associator based on the Counting Technique
Compares two sets of
tracks
, each formed of a sequence ofState
objects and returns anAssociation
object for each time at which the twoState
within thetracks
are assessed to be associated.Uses an algorithm called the Counting Technique [1]. Associations are triggered by track states being within a threshold distance for a given number of timestamps. Associations are terminated when either the two
tracks
end or the twoState
are separated by a distance greater than the threshold at the next time step.References
Note
Association is not prioritised based on historic associations or distance. If, at a specific time step, the
State
of one of thetracks
is assessed as close to more than one track then anAssociation
object will be return for all possible association combinations.- Parameters:
association_threshold (
float
) – Threshold distance measure which states must be within for an association to be recordedconsec_pairs_confirm (
int
, optional) – Number of consecutive time instances which track pairs are required to be within a specified threshold in order for an association to be formed. Default is 3consec_misses_end (
int
, optional) – Number of consecutive time instances which track pairs are required to exceed a specified threshold in order for an association to be ended. Default is 2measure (
Measure
, optional) – Distance measure to use. Must useEuclideanWeighted()
if use_positional_only set to True. Default isEuclideanWeighted()
usinguse_positional_only
andpos_map
. Note if neither are provided this is equivalent to a standard Euclideanpos_map (
list
, optional) – List of items specifying the mapping of the position components of the state space fortracks_set_1
. Defaults to wholeStateVector()
, but must be provided wheneveruse_positional_only
is set to Trueuse_positional_only (
bool
, optional) – If True, the differences in velocity/acceleration values for each state are ignored in the calculation for the association threshold. Default is Trueposition_weighting (
float
, optional) – Ifuse_positional_only
is set to False, this decides how much to weight position components compared to others (such as velocity). Default is 0.6one_to_one (
bool
, optional) – If True, it is ensured no two associations ever contain the same track at the same time
- association_threshold: float
Threshold distance measure which states must be within for an association to be recorded
- consec_pairs_confirm: int
Number of consecutive time instances which track pairs are required to be within a specified threshold in order for an association to be formed. Default is 3
- consec_misses_end: int
Number of consecutive time instances which track pairs are required to exceed a specified threshold in order for an association to be ended. Default is 2
- measure: Measure
Distance measure to use. Must use
EuclideanWeighted()
if use_positional_only set to True. Default isEuclideanWeighted()
usinguse_positional_only
andpos_map
. Note if neither are provided this is equivalent to a standard Euclidean
- pos_map: list
List of items specifying the mapping of the position components of the state space for
tracks_set_1
. Defaults to wholeStateVector()
, but must be provided wheneveruse_positional_only
is set to True
- use_positional_only: bool
If True, the differences in velocity/acceleration values for each state are ignored in the calculation for the association threshold. Default is True
- position_weighting: float
If
use_positional_only
is set to False, this decides how much to weight position components compared to others (such as velocity). Default is 0.6
- one_to_one: bool
If True, it is ensured no two associations ever contain the same track at the same time
- class stonesoup.dataassociator.tracktotrack.TrackToTruth(association_threshold: float, consec_pairs_confirm: int = 3, consec_misses_end: int = 2, measure: Measure = Euclidean(mapping=None, mapping2=None))[source]
Bases:
TwoTrackToTrackAssociator
Track to truth associator
Compares two sets of
Track
, each formed of a sequence ofState
objects and returns anAssociation
object for each time at which a the twoState
within theTrack
are assessed to be associated. Tracks are considered to be associated with the Truth if the trueState
is the closest to the track and within the specified distance for a specified number of time steps.Associations between Truth and Track if the Truth is no longer the ‘closest’ to the track or the distance exceeds the specified threshold for a specified number of consecutive time steps.
Associates will be ended by consec_misses_end before any new associations are considered even if consec_pairs_confirm < consec_misses_end
Note
Tracks can only be associated with one Truth (one-2-one relationship) at a given time step however a Truth track can be associated with multiple Tracks (one-2-many relationship).
- Parameters:
association_threshold (
float
) – Threshold distance measure which states must be within for an association to be recordedconsec_pairs_confirm (
int
, optional) – Number of consecutive time instances which track-truth pairs are required to be within a specified threshold in order for an association to be formed. Default is 3consec_misses_end (
int
, optional) – Number of consecutive time instances which track-truth pairs are required to exceed a specified threshold in order for an association to be ended. Default is 2measure (
Measure
, optional) – Distance measure to use. DefaultEuclidean()
- association_threshold: float
Threshold distance measure which states must be within for an association to be recorded
- consec_pairs_confirm: int
Number of consecutive time instances which track-truth pairs are required to be within a specified threshold in order for an association to be formed. Default is 3
- consec_misses_end: int
Number of consecutive time instances which track-truth pairs are required to exceed a specified threshold in order for an association to be ended. Default is 2
- associate_tracks(tracks_set: Set[Track], truth_set: Set[GroundTruthPath])[source]
Associate Tracks
Method compares to sets of
Track
objects and will determine associations between the two sets.- Parameters:
tracks_set (set of
Track
objects) – Tracks to associate to truthtruth_set (set of
GroundTruthPath
objects) – Truth to associate to tracks
- Returns:
Contains a set of
Association
objects- Return type:
- class stonesoup.dataassociator.tracktotrack.TrackIDbased[source]
Bases:
TwoTrackToTrackAssociator
Track ID based associator
Compares set of
Track
objects to set ofGroundTruth
objects, each formed of a sequence ofState
objects and returns anAssociation
object for each time at which a the twoState
within theTrack
andGroundTruthPath
are assessed to be associated. Tracks are considered to be associated with the Ground Truth if the ID of the Track is the same as the ID of the Ground Truth.- associate_tracks(tracks_set, truths_set)[source]
Associate two sets of tracks together.
- Parameters:
tracks_set (list of
Track
objects) – Tracks to associate to ground truths settruths_set (list of
GroundTruthPath
objects) – Ground truths to associate to tracks set
- Returns:
Contains a set of
Association
objects- Return type:
- class stonesoup.dataassociator.tracktotrack.OneToOneTrackAssociator(measure: TrackMeasure, association_threshold: float = None, maximise_measure: bool = False)[source]
Bases:
TwoTrackToTrackAssociator
,OneToOneAssociator
Uses the
OneToOneAssociator
to associate tracks together- Parameters:
measure (
TrackMeasure
)association_threshold (
float
, optional) – The maximum (minimum ifmaximise_measure
is true) value from themeasure
needed to associate two objects. If the default value of None is used then the association threshold is set to plus/minus an arbitrarily large number that shouldn’t limit associations.maximise_measure (
bool
, optional) – Should the association algorithm attempt to maximise or minimise the output of the measure.
- measure: TrackMeasure
- associate_tracks(*tracks_sets: Set[Track]) AssociationSet [source]
Associate two sets of tracks together.
- Parameters:
- Returns:
Contains a set of
Association
objects- Return type:
Trees
- class stonesoup.dataassociator.tree.DetectionKDTreeMixIn(hypothesiser: Hypothesiser, predictor: Predictor, updater: Updater, number_of_neighbours: int = None, max_distance: float = inf, max_distance_covariance_multiplier: float = None)[source]
Bases:
Base
Detection kd-tree based mixin
Construct a kd-tree from detections and then use a
Predictor
andUpdater
to get prediction of track in measurement space. This is then queried against the kd-tree, and only matching detections are passed to thehypothesiser
.Notes
This is only suitable where measurements are in same space as each other (i.e. have the same measurement model) and at the same timestamp.
- Parameters:
hypothesiser (
Hypothesiser
) – Underlying hypothesiser used to generate detection-target pairspredictor (
Predictor
) – Predict tracks to detection timesupdater (
Updater
) – Updater used to get measurement predictionnumber_of_neighbours (
int
, optional) – Number of neighbours to find. Default None, which means all points within themax_distance
are returned.max_distance (
float
, optional) – Max distance to return points. Default infmax_distance_covariance_multiplier (
float
, optional) – If set, the max distance will be limited to maximum of covariance diagonal of the track state, multiplied by this attribute, ormax_distance
, whichever is smallest. Default None where onlymax_distance
is used.
- hypothesiser: Hypothesiser
Underlying hypothesiser used to generate detection-target pairs
- number_of_neighbours: int
Number of neighbours to find. Default None, which means all points within the
max_distance
are returned.
- max_distance_covariance_multiplier: float
If set, the max distance will be limited to maximum of covariance diagonal of the track state, multiplied by this attribute, or
max_distance
, whichever is smallest. Default None where onlymax_distance
is used.
- class stonesoup.dataassociator.tree.TPRTreeMixIn(hypothesiser: Hypothesiser, measurement_model: MeasurementModel, horizon_time: timedelta, pos_mapping: Sequence[int] = None, vel_mapping: Sequence[int] = None)[source]
Bases:
Base
Detection TPR tree based mixin
Construct a TPR-tree to filter detections for generating hypotheses. This assumes tracks move in constant velocity like model, using the mean and covariance to define region to look for detections.
Notes
This requires that track state has a mean (position and velocity) and covariance, which is then approximated to a TPR node (position, velocity and time bounding box).
- Parameters:
hypothesiser (
Hypothesiser
) – Underlying hypothesiser used to generate detection-target pairsmeasurement_model (
MeasurementModel
) – Measurement model used within the TPR treehorizon_time (
datetime.timedelta
) – How far the TPR tree should look into the futurepos_mapping (
Sequence[int]
, optional) – Mapping for position coordinates. Default None, which uses the measurement modelmappingvel_mapping (
Sequence[int]
, optional) – Mapping for velocity coordinates. Default None, which uses the position mapping adding offset of 1 to each
- hypothesiser: Hypothesiser
Underlying hypothesiser used to generate detection-target pairs
- measurement_model: MeasurementModel
Measurement model used within the TPR tree
- class stonesoup.dataassociator.tree.DetectionKDTreeNN(hypothesiser: Hypothesiser, predictor: Predictor, updater: Updater, number_of_neighbours: int = None, max_distance: float = inf, max_distance_covariance_multiplier: float = None)[source]
Bases:
DetectionKDTreeMixIn
,NearestNeighbour
DetectionKDTreeNN from NearestNeighbour and DetectionKDTreeMixIn
- Parameters:
hypothesiser (
Hypothesiser
) – Underlying hypothesiser used to generate detection-target pairspredictor (
Predictor
) – Predict tracks to detection timesupdater (
Updater
) – Updater used to get measurement predictionnumber_of_neighbours (
int
, optional) – Number of neighbours to find. Default None, which means all points within themax_distance
are returned.max_distance (
float
, optional) – Max distance to return points. Default infmax_distance_covariance_multiplier (
float
, optional) – If set, the max distance will be limited to maximum of covariance diagonal of the track state, multiplied by this attribute, ormax_distance
, whichever is smallest. Default None where onlymax_distance
is used.
- class stonesoup.dataassociator.tree.DetectionKDTreeGNN(hypothesiser: Hypothesiser, predictor: Predictor, updater: Updater, number_of_neighbours: int = None, max_distance: float = inf, max_distance_covariance_multiplier: float = None)[source]
Bases:
DetectionKDTreeMixIn
,GlobalNearestNeighbour
DetectionKDTreeGNN from GlobalNearestNeighbour and DetectionKDTreeMixIn
- Parameters:
hypothesiser (
Hypothesiser
) – Underlying hypothesiser used to generate detection-target pairspredictor (
Predictor
) – Predict tracks to detection timesupdater (
Updater
) – Updater used to get measurement predictionnumber_of_neighbours (
int
, optional) – Number of neighbours to find. Default None, which means all points within themax_distance
are returned.max_distance (
float
, optional) – Max distance to return points. Default infmax_distance_covariance_multiplier (
float
, optional) – If set, the max distance will be limited to maximum of covariance diagonal of the track state, multiplied by this attribute, ormax_distance
, whichever is smallest. Default None where onlymax_distance
is used.
- class stonesoup.dataassociator.tree.DetectionKDTreeGNN2D(hypothesiser: Hypothesiser, predictor: Predictor, updater: Updater, number_of_neighbours: int = None, max_distance: float = inf, max_distance_covariance_multiplier: float = None)[source]
Bases:
DetectionKDTreeMixIn
,GNNWith2DAssignment
DetectionKDTreeGNN2D from GNNWith2DAssignment and DetectionKDTreeMixIn
- Parameters:
hypothesiser (
Hypothesiser
) – Underlying hypothesiser used to generate detection-target pairspredictor (
Predictor
) – Predict tracks to detection timesupdater (
Updater
) – Updater used to get measurement predictionnumber_of_neighbours (
int
, optional) – Number of neighbours to find. Default None, which means all points within themax_distance
are returned.max_distance (
float
, optional) – Max distance to return points. Default infmax_distance_covariance_multiplier (
float
, optional) – If set, the max distance will be limited to maximum of covariance diagonal of the track state, multiplied by this attribute, ormax_distance
, whichever is smallest. Default None where onlymax_distance
is used.
- class stonesoup.dataassociator.tree.TPRTreeNN(hypothesiser: Hypothesiser, measurement_model: MeasurementModel, horizon_time: timedelta, pos_mapping: Sequence[int] = None, vel_mapping: Sequence[int] = None)[source]
Bases:
TPRTreeMixIn
,NearestNeighbour
TPRTreeNN from NearestNeighbour and TPRTreeMixIn
- Parameters:
hypothesiser (
Hypothesiser
) – Underlying hypothesiser used to generate detection-target pairsmeasurement_model (
MeasurementModel
) – Measurement model used within the TPR treehorizon_time (
datetime.timedelta
) – How far the TPR tree should look into the futurepos_mapping (
Sequence[int]
, optional) – Mapping for position coordinates. Default None, which uses the measurement modelmappingvel_mapping (
Sequence[int]
, optional) – Mapping for velocity coordinates. Default None, which uses the position mapping adding offset of 1 to each
- class stonesoup.dataassociator.tree.TPRTreeGNN(hypothesiser: Hypothesiser, measurement_model: MeasurementModel, horizon_time: timedelta, pos_mapping: Sequence[int] = None, vel_mapping: Sequence[int] = None)[source]
Bases:
TPRTreeMixIn
,GlobalNearestNeighbour
TPRTreeGNN from GlobalNearestNeighbour and TPRTreeMixIn
- Parameters:
hypothesiser (
Hypothesiser
) – Underlying hypothesiser used to generate detection-target pairsmeasurement_model (
MeasurementModel
) – Measurement model used within the TPR treehorizon_time (
datetime.timedelta
) – How far the TPR tree should look into the futurepos_mapping (
Sequence[int]
, optional) – Mapping for position coordinates. Default None, which uses the measurement modelmappingvel_mapping (
Sequence[int]
, optional) – Mapping for velocity coordinates. Default None, which uses the position mapping adding offset of 1 to each
- class stonesoup.dataassociator.tree.TPRTreeGNN2D(hypothesiser: Hypothesiser, measurement_model: MeasurementModel, horizon_time: timedelta, pos_mapping: Sequence[int] = None, vel_mapping: Sequence[int] = None)[source]
Bases:
TPRTreeMixIn
,GNNWith2DAssignment
TPRTreeGNN2D from GNNWith2DAssignment and TPRTreeMixIn
- Parameters:
hypothesiser (
Hypothesiser
) – Underlying hypothesiser used to generate detection-target pairsmeasurement_model (
MeasurementModel
) – Measurement model used within the TPR treehorizon_time (
datetime.timedelta
) – How far the TPR tree should look into the futurepos_mapping (
Sequence[int]
, optional) – Mapping for position coordinates. Default None, which uses the measurement modelmappingvel_mapping (
Sequence[int]
, optional) – Mapping for velocity coordinates. Default None, which uses the position mapping adding offset of 1 to each
- class stonesoup.dataassociator.tree.KDTreePDA(hypothesiser: Hypothesiser, predictor: Predictor, updater: Updater, number_of_neighbours: int = None, max_distance: float = inf, max_distance_covariance_multiplier: float = None)[source]
Bases:
DetectionKDTreeMixIn
,PDA
KDTreePDA from PDA and DetectionKDTreeMixin
- Parameters:
hypothesiser (
Hypothesiser
) – Underlying hypothesiser used to generate detection-target pairspredictor (
Predictor
) – Predict tracks to detection timesupdater (
Updater
) – Updater used to get measurement predictionnumber_of_neighbours (
int
, optional) – Number of neighbours to find. Default None, which means all points within themax_distance
are returned.max_distance (
float
, optional) – Max distance to return points. Default infmax_distance_covariance_multiplier (
float
, optional) – If set, the max distance will be limited to maximum of covariance diagonal of the track state, multiplied by this attribute, ormax_distance
, whichever is smallest. Default None where onlymax_distance
is used.
- class stonesoup.dataassociator.tree.KDTreeJPDA(hypothesiser: Hypothesiser, predictor: Predictor, updater: Updater, number_of_neighbours: int = None, max_distance: float = inf, max_distance_covariance_multiplier: float = None)[source]
Bases:
DetectionKDTreeMixIn
,JPDA
KDTreeJPDA from JPDA and DetectionKDTreeMixin
- Parameters:
hypothesiser (
Hypothesiser
) – Underlying hypothesiser used to generate detection-target pairspredictor (
Predictor
) – Predict tracks to detection timesupdater (
Updater
) – Updater used to get measurement predictionnumber_of_neighbours (
int
, optional) – Number of neighbours to find. Default None, which means all points within themax_distance
are returned.max_distance (
float
, optional) – Max distance to return points. Default infmax_distance_covariance_multiplier (
float
, optional) – If set, the max distance will be limited to maximum of covariance diagonal of the track state, multiplied by this attribute, ormax_distance
, whichever is smallest. Default None where onlymax_distance
is used.
- class stonesoup.dataassociator.tree.TPRTreePDA(hypothesiser: Hypothesiser, measurement_model: MeasurementModel, horizon_time: timedelta, pos_mapping: Sequence[int] = None, vel_mapping: Sequence[int] = None)[source]
Bases:
TPRTreeMixIn
,PDA
TPRTreePDA from PDA and TPRTreeMixIn
- Parameters:
hypothesiser (
Hypothesiser
) – Underlying hypothesiser used to generate detection-target pairsmeasurement_model (
MeasurementModel
) – Measurement model used within the TPR treehorizon_time (
datetime.timedelta
) – How far the TPR tree should look into the futurepos_mapping (
Sequence[int]
, optional) – Mapping for position coordinates. Default None, which uses the measurement modelmappingvel_mapping (
Sequence[int]
, optional) – Mapping for velocity coordinates. Default None, which uses the position mapping adding offset of 1 to each
- class stonesoup.dataassociator.tree.TPRTreeJPDA(hypothesiser: Hypothesiser, measurement_model: MeasurementModel, horizon_time: timedelta, pos_mapping: Sequence[int] = None, vel_mapping: Sequence[int] = None)[source]
Bases:
TPRTreeMixIn
,JPDA
TPRTreeJPDA from JPDA and TPRTreeMixIn
- Parameters:
hypothesiser (
Hypothesiser
) – Underlying hypothesiser used to generate detection-target pairsmeasurement_model (
MeasurementModel
) – Measurement model used within the TPR treehorizon_time (
datetime.timedelta
) – How far the TPR tree should look into the futurepos_mapping (
Sequence[int]
, optional) – Mapping for position coordinates. Default None, which uses the measurement modelmappingvel_mapping (
Sequence[int]
, optional) – Mapping for velocity coordinates. Default None, which uses the position mapping adding offset of 1 to each
Multi-Frame Assignment
- class stonesoup.dataassociator.mfa.MFADataAssociator(hypothesiser: MFAHypothesiser, slide_window: int)[source]
Bases:
DataAssociator
Data associator using multi-frame assignment algorithm over a sliding window.
References
Xia, Y., Granström, K., Svensson, L., García-Fernández, Á.F., and Williams, J.L., 2019. Multiscan Implementation of the Trajectory Poisson Multi-Bernoulli Mixture Filter. J. Adv. Information Fusion, 14(2), pp. 213–235.
- Parameters:
hypothesiser (
MFAHypothesiser
) – Generate a set of hypotheses for each prediction-detection pairslide_window (
int
) – Length of MFA slide window
- hypothesiser: MFAHypothesiser
Generate a set of hypotheses for each prediction-detection pair
- associate(tracks, detections, timestamp, **kwargs)[source]
Associate tracks and detections
- Parameters:
tracks (set of
Track
) – Tracks which detections will be associated to.detections (set of
Detection
) – Detections to be associated to tracks.timestamp (datetime.datetime) – Timestamp to be used for missed detections and to predict to.
- Returns:
Mapping of track to Hypothesis
- Return type:
mapping of
Track
:Hypothesis