PartialPriorFactor.h

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/* ----------------------------------------------------------------------------
 
 * GTSAM Copyright 2010, Georgia Tech Research Corporation,
 * Atlanta, Georgia 30332-0415
 * All Rights Reserved
 * Authors: Frank Dellaert, et al. (see THANKS for the full author list)
 
 * See LICENSE for the license information
 
 * -------------------------------------------------------------------------- */

 
#pragma once
 
#include <gtsam/nonlinear/NonlinearFactor.h>
#include <gtsam/base/Lie.h>
 
namespace gtsam {

  template<class VALUE>
  class PartialPriorFactor: public NoiseModelFactorN<VALUE> {
 
  public:
    typedef VALUE T;
 
  protected:
    // Concept checks on the variable type - currently requires Lie
    GTSAM_CONCEPT_LIE_TYPE(VALUE)
 
    typedef NoiseModelFactorN<VALUE> Base;
    typedef PartialPriorFactor<VALUE> This;
 
    Vector prior_;                 
    std::vector<size_t> indices_;  

    PartialPriorFactor() {}

    PartialPriorFactor(Key key, const SharedNoiseModel& model)
      : Base(model, key) {}
 
  public:
 
    ~PartialPriorFactor() override {}

    PartialPriorFactor(Key key, size_t idx, double prior, const SharedNoiseModel& model) :
      Base(model, key),
      prior_((Vector(1) << prior).finished()),
      indices_(1, idx) {
      assert(model->dim() == 1);
    }

    PartialPriorFactor(Key key, const std::vector<size_t>& indices, const Vector& prior,
        const SharedNoiseModel& model) :
        Base(model, key),
        prior_(prior),
        indices_(indices) {
      assert((size_t)prior_.size() == indices_.size());
      assert(model->dim() == (size_t)prior.size());
    }

    gtsam::NonlinearFactor::shared_ptr clone() const override {
      return boost::static_pointer_cast<gtsam::NonlinearFactor>(
          gtsam::NonlinearFactor::shared_ptr(new This(*this))); }


    void print(const std::string& s, const KeyFormatter& keyFormatter = DefaultKeyFormatter) const override {
      Base::print(s, keyFormatter);
      gtsam::print(prior_, "prior");
    }

    bool equals(const NonlinearFactor& expected, double tol=1e-9) const override {
      const This *e = dynamic_cast<const This*> (&expected);
      return e != nullptr && Base::equals(*e, tol) &&
          gtsam::equal_with_abs_tol(this->prior_, e->prior_, tol) &&
          this->indices_ == e->indices_;
    }


    Vector evaluateError(const T& p, boost::optional<Matrix&> H = boost::none) const override {
      Eigen::Matrix<double, T::dimension, T::dimension> H_local;
 
      // If the Rot3 Cayley map is used, Rot3::LocalCoordinates will throw a runtime error
      // when asked to compute the Jacobian matrix (see Rot3M.cpp).
      #ifdef GTSAM_ROT3_EXPMAP
      const Vector full_tangent = T::LocalCoordinates(p, H ? &H_local : nullptr);
      #else
      const Vector full_tangent = T::Logmap(p, H ? &H_local : nullptr);
      #endif
 
      if (H) {
        (*H) = Matrix::Zero(indices_.size(), T::dimension);
        for (size_t i = 0; i < indices_.size(); ++i) {
          (*H).row(i) = H_local.row(indices_.at(i));
        }
      }
      // Select relevant parameters from the tangent vector.
      Vector partial_tangent = Vector::Zero(indices_.size());
      for (size_t i = 0; i < indices_.size(); ++i) {
        partial_tangent(i) = full_tangent(indices_.at(i));
      }
 
      return partial_tangent - prior_;
    }
 
    // access
    const Vector& prior() const { return prior_; }
    const std::vector<size_t>& indices() const { return indices_; }
 
  private:
    friend class boost::serialization::access;
    template<class ARCHIVE>
    void serialize(ARCHIVE & ar, const unsigned int /*version*/) {
      // NoiseModelFactor1 instead of NoiseModelFactorN for backward compatibility
      ar & boost::serialization::make_nvp("NoiseModelFactor1",
          boost::serialization::base_object<Base>(*this));
      ar & BOOST_SERIALIZATION_NVP(prior_);
      ar & BOOST_SERIALIZATION_NVP(indices_);
      // ar & BOOST_SERIALIZATION_NVP(H_);
    }
  }; // \class PartialPriorFactor
 
}