2009-08-22 06:23:24 +08:00
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/**
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* @file NonlinearFactor.cpp
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* @brief nonlinear factor versions which assume a Gaussian noise on a measurement
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* @brief predicted by a non-linear function h nonlinearFactor
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* @author Frank Dellaert
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Large gtsam refactoring
To support faster development *and* better performance Richard and I pushed through a large refactoring of NonlinearFactors.
The following are the biggest changes:
1) NonLinearFactor1 and NonLinearFactor2 are now templated on Config, Key type, and X type, where X is the argument to the measurement function.
2) The measurement itself is no longer kept in the nonlinear factor. Instead, a derived class (see testVSLAMFactor, testNonlinearEquality, testPose3Factor etc...) has to implement a function to compute the errors, "evaluateErrors". Instead of (h(x)-z), it needs to return (z-h(x)), so Ax-b is an approximation of the error. IMPORTANT: evaluateErrors needs - if asked - *combine* the calculation of the function value h(x) and the derivatives dh(x)/dx. This was a major performance issue. To do this, boost::optional<Matrix&> arguments are provided, and tin EvaluateErrors you just says something like
if (H) *H = Matrix_(3,6,....);
3) We are no longer using int or strings for nonlinear factors. Instead, the preferred key type is now Symbol, defined in Key.h. This is both fast and cool: you can construct it from an int, and cast it to a strong. It also does type checking: a Symbol<Pose3,'x'> will not match a Symbol<Pose2,'x'>
4) minor: take a look at LieConfig.h: it help you avoid writing a lot of code bu automatically creating configs for a certain type. See e.g. Pose3Config.h. A "double" LieConfig is on the way - Thanks Richard and Manohar !
2010-01-14 06:25:03 +08:00
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* @author Richard Roberts
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*
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* Earlier prototype contributors: Kai Ni, Carlos Nieto, Christian Potthast
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2009-08-22 06:23:24 +08:00
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*/
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2009-10-07 02:25:04 +08:00
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2009-08-22 06:23:24 +08:00
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#include "NonlinearFactor.h"
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using namespace std;
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using namespace gtsam;
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/* ************************************************************************* */
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