Detailed Description
A nonlinear sum-of-squares factor with a zero-mean noise model implementing the density \( P(z|x) \propto exp -0.5*|z-h(x)|^2_C \) Templated on the parameter type X and the values structure Values There is no return type specified for h(x).
Instead, we require the derived class implements \( \mathtt{error\_vector}(x) = h(x)-z \approx A \delta x - b \) This allows a graph to have factors with measurements of mixed type.
The noise model is typically Gaussian, but robust and constrained error models are also supported.
Inheritance diagram for gtsam::NoiseModelFactor:
Public Member Functions | |
| NoiseModelFactor () | |
| Default constructor for I/O only. | |
| virtual | ~NoiseModelFactor () |
| Destructor. | |
| template<typename CONTAINER > | |
| NoiseModelFactor (const SharedNoiseModel &noiseModel, const CONTAINER &keys) | |
| Constructor. | |
| virtual void | print (const std::string &s="", const KeyFormatter &keyFormatter=DefaultKeyFormatter) const |
| Print. | |
| virtual bool | equals (const NonlinearFactor &f, double tol=1e-9) const |
| Check if two factors are equal. | |
| virtual size_t | dim () const |
| get the dimension of the factor (number of rows on linearization) | |
| const SharedNoiseModel & | noiseModel () const |
| access to the noise model | |
| virtual Vector | unwhitenedError (const Values &x, boost::optional< std::vector< Matrix > & > H=boost::none) const =0 |
| Error function without the NoiseModel, \( z-h(x) \). More... | |
| Vector | whitenedError (const Values &c) const |
| Vector of errors, whitened This is the raw error, i.e., i.e. More... | |
| virtual double | error (const Values &c) const |
| Calculate the error of the factor. More... | |
| boost::shared_ptr< GaussianFactor > | linearize (const Values &x) const |
| Linearize a non-linearFactorN to get a GaussianFactor, \( Ax-b \approx h(x+\delta x)-z = h(x) + A \delta x - z \) Hence \( b = z - h(x) = - \mathtt{error\_vector}(x) \). | |
| Public Member Functions inherited from gtsam::NonlinearFactor | |
| NonlinearFactor () | |
| Default constructor for I/O only. | |
| template<typename CONTAINER > | |
| NonlinearFactor (const CONTAINER &keys) | |
| Constructor from a collection of the keys involved in this factor. | |
| virtual | ~NonlinearFactor () |
| Destructor. | |
| virtual bool | active (const Values &) const |
| Checks whether a factor should be used based on a set of values. More... | |
| virtual shared_ptr | clone () const |
| Creates a shared_ptr clone of the factor - needs to be specialized to allow for subclasses. More... | |
| shared_ptr | rekey (const std::map< Key, Key > &rekey_mapping) const |
| Creates a shared_ptr clone of the factor with different keys using a map from old->new keys. | |
| shared_ptr | rekey (const KeyVector &new_keys) const |
| Clones a factor and fully replaces its keys. More... | |
| Public Member Functions inherited from gtsam::Factor | |
| Key | front () const |
| First key. | |
| Key | back () const |
| Last key. | |
| const_iterator | find (Key key) const |
| find | |
| const KeyVector & | keys () const |
| Access the factor's involved variable keys. | |
| const_iterator | begin () const |
| Iterator at beginning of involved variable keys. | |
| const_iterator | end () const |
| Iterator at end of involved variable keys. | |
| size_t | size () const |
| void | print (const std::string &s="Factor", const KeyFormatter &formatter=DefaultKeyFormatter) const |
| print | |
| void | printKeys (const std::string &s="Factor", const KeyFormatter &formatter=DefaultKeyFormatter) const |
| print only keys | |
| KeyVector & | keys () |
| iterator | begin () |
| Iterator at beginning of involved variable keys. | |
| iterator | end () |
| Iterator at end of involved variable keys. | |
Public Types | |
| typedef boost::shared_ptr< This > | shared_ptr |
| Noise model. | |
| Public Types inherited from gtsam::NonlinearFactor | |
| typedef boost::shared_ptr< This > | shared_ptr |
| Public Types inherited from gtsam::Factor | |
| typedef KeyVector::iterator | iterator |
| Iterator over keys. | |
| typedef KeyVector::const_iterator | const_iterator |
| Const iterator over keys. | |
Protected Types | |
| typedef NonlinearFactor | Base |
| typedef NoiseModelFactor | This |
| Protected Types inherited from gtsam::NonlinearFactor | |
| typedef Factor | Base |
| typedef NonlinearFactor | This |
Protected Member Functions | |
| NoiseModelFactor (const SharedNoiseModel &noiseModel) | |
| Constructor - only for subclasses, as this does not set keys. | |
| Protected Member Functions inherited from gtsam::Factor | |
| Factor () | |
| Default constructor for I/O. | |
| template<typename CONTAINER > | |
| Factor (const CONTAINER &keys) | |
| Construct factor from container of keys. More... | |
| template<typename ITERATOR > | |
| Factor (ITERATOR first, ITERATOR last) | |
| Construct factor from iterator keys. More... | |
| bool | equals (const This &other, double tol=1e-9) const |
| check equality | |
Protected Attributes | |
| SharedNoiseModel | noiseModel_ |
| Protected Attributes inherited from gtsam::Factor | |
| KeyVector | keys_ |
| The keys involved in this factor. | |
Friends | |
| class | boost::serialization::access |
| Serialization function. | |
Additional Inherited Members | |
| Static Protected Member Functions inherited from gtsam::Factor | |
| template<typename CONTAINER > | |
| static Factor | FromKeys (const CONTAINER &keys) |
| Construct factor from container of keys. More... | |
| template<typename ITERATOR > | |
| static Factor | FromIterators (ITERATOR first, ITERATOR last) |
| Construct factor from iterator keys. More... | |
Member Function Documentation
◆ error()
|
virtual |
Calculate the error of the factor.
This is the log-likelihood, e.g. \( 0.5(h(x)-z)^2/\sigma^2 \) in case of Gaussian. In this class, we take the raw prediction error \( h(x)-z \), ask the noise model to transform it to \( (h(x)-z)^2/\sigma^2 \), and then multiply by 0.5.
Implements gtsam::NonlinearFactor.
Reimplemented in gtsam::NonlinearEquality< VALUE >.
◆ unwhitenedError()
|
pure virtual |
Error function without the NoiseModel, \( z-h(x) \).
Override this method to finish implementing an N-way factor. If the optional arguments is specified, it should compute both the function evaluation and its derivative(s) in H.
Implemented in gtsam::NoiseModelFactor6< VALUE1, VALUE2, VALUE3, VALUE4, VALUE5, VALUE6 >, gtsam::NoiseModelFactor6< Pose3, Vector3, Pose3, Vector3, imuBias::ConstantBias, imuBias::ConstantBias >, gtsam::NoiseModelFactor5< VALUE1, VALUE2, VALUE3, VALUE4, VALUE5 >, gtsam::NoiseModelFactor5< Pose3, Vector3, Pose3, Vector3, imuBias::ConstantBias >, gtsam::NoiseModelFactor5< POSE, VELOCITY, IMUBIAS, POSE, VELOCITY >, gtsam::NoiseModelFactor4< VALUE1, VALUE2, VALUE3, VALUE4 >, gtsam::NoiseModelFactor4< Pose2, Pose2, Pose2, Pose2 >, gtsam::NoiseModelFactor4< Pose2, Pose2, Pose2, Point2 >, gtsam::NoiseModelFactor4< POSE, POSE, LANDMARK, CALIBRATION >, gtsam::NoiseModelFactor4< POSE, VELOCITY, POSE, VELOCITY >, gtsam::NoiseModelFactor3< VALUE1, VALUE2, VALUE3 >, gtsam::NoiseModelFactor3< Pose3, Point3, CALIBRATION >, gtsam::NoiseModelFactor3< NavState, NavState, imuBias::ConstantBias >, gtsam::NoiseModelFactor3< POSE, POSE, LANDMARK >, gtsam::NoiseModelFactor3< double, Unit3, Point3 >, gtsam::NoiseModelFactor3< Pose3, Pose3, Vector3 >, gtsam::NoiseModelFactor3< POINT, TRANSFORM, POINT >, gtsam::NoiseModelFactor3< Rot3, Rot3, Vector3 >, gtsam::NoiseModelFactor3< Pose3, Pose3, Vector6 >, gtsam::NoiseModelFactor3< Vector6, Vector6, Pose3 >, gtsam::NoiseModelFactor3< POSE, LANDMARK, INVDEPTH >, gtsam::NoiseModelFactor3< double, double, double >, gtsam::NoiseModelFactor2< VALUE1, VALUE2 >, gtsam::NoiseModelFactor2< POSE, LANDMARK >, gtsam::NoiseModelFactor2< Pose3, Vector6 >, gtsam::NoiseModelFactor2< Point3, Point3 >, gtsam::NoiseModelFactor2< EssentialMatrix, double >, gtsam::NoiseModelFactor2< PoseRTV, PoseRTV >, gtsam::NoiseModelFactor2< Pose3, OrientedPlane3 >, gtsam::NoiseModelFactor2< Pose2, Point2 >, gtsam::NoiseModelFactor2< Pose3, Point3 >, gtsam::NoiseModelFactor2< Pose3, Pose3 >, gtsam::NoiseModelFactor2< POSE, POSE >, gtsam::NoiseModelFactor2< CAMERA, LANDMARK >, gtsam::NoiseModelFactor2< VALUE, VALUE >, gtsam::NoiseModelFactor2< Pose3, Vector3 >, gtsam::NoiseModelFactor1< VALUE >, gtsam::NoiseModelFactor1< Pose3 >, gtsam::NoiseModelFactor1< EssentialMatrix >, gtsam::NoiseModelFactor1< Rot3 >, gtsam::NoiseModelFactor1< POSE >, gtsam::NoiseModelFactor1< Rot2 >, gtsam::NoiseModelFactor1< PoseRTV >, gtsam::NoiseModelFactor1< NavState >, gtsam::NoiseModelFactor1< Point3 >, gtsam::NoiseModelFactor1< OrientedPlane3 >, gtsam::SmartRangeFactor, gtsam::MultiProjectionFactor< POSE, LANDMARK, CALIBRATION >, gtsam::ExpressionFactor< T >, gtsam::ExpressionFactor< BearingRange< A1, A2 > >, and gtsam::ExpressionFactor< double >.
◆ whitenedError()
| Vector gtsam::NoiseModelFactor::whitenedError | ( | const Values & | c | ) | const |
Vector of errors, whitened This is the raw error, i.e., i.e.
\( (h(x)-z)/\sigma \) in case of a Gaussian
The documentation for this class was generated from the following files:
- /Users/dellaert/git/gtsam/gtsam/nonlinear/NonlinearFactor.h
- /Users/dellaert/git/gtsam/gtsam/nonlinear/NonlinearFactor.cpp
