move the IncrementalFixedLagExample example to unstable module to fix the link error
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/* ----------------------------------------------------------------------------
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* GTSAM Copyright 2010-2025, Georgia Tech Research Corporation,
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* Atlanta, Georgia 30332-0415
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* All Rights Reserved
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* Authors: Frank Dellaert, et al. (see THANKS for the full author list)
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* See LICENSE for the license information
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* -------------------------------------------------------------------------- */
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/**
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* @file IncrementalFixedLagExample.cpp
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* @brief Example of incremental fixed-lag smoother using real-world data.
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* @author Xiangcheng Hu (xhubd@connect.ust.hk), Frank Dellaert, Kevin Doherty
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* @date Janaury 15, 2025
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*
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* Key objectives:
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* - Validate `IncrementalFixedLagSmoother` functionality with real-world data.
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* - Showcase how setting `findUnusedFactorSlots = true` addresses the issue #1452 in GTSAM, ensuring
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* that unused factor slots (nullptrs) are correctly released when old factors are marginalized.
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*
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* This example leverages pose measurements from a real scenario. The test data (named "IncrementalFixedLagSmootherTestData.txt") is
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* based on the corridor_day sequence from the FusionPortable dataset (https://fusionportable.github.io/dataset/fusionportable/).
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* - 1 prior factor derived from point cloud ICP alignment with a prior map.
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* - 199 relative pose factors derived from FAST-LIO2 odometry.
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*
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* Data Format (IncrementalFixedLagSmootherTestData.txt):
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* 1) PRIOR factor line:
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* @code
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* 0 timestamp key x y z roll pitch yaw cov_6x6
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* @endcode
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* - "0" indicates PRIOR factor.
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* - "timestamp" is the observation time (in seconds).
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* - "key" is the integer ID for the Pose3 variable.
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* - (x, y, z, roll, pitch, yaw) define the pose.
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* - "cov_6x6" is the full 6x6 covariance matrix (row-major).
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*
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* 2) BETWEEN factor line:
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* @code
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* 1 timestamp key1 key2 x y z roll pitch yaw cov_6x6
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* @endcode
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* - "1" indicates BETWEEN factor.
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* - "timestamp" is the observation time (in seconds).
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* - "key1" and "key2" are the integer IDs for the connected Pose3 variables.
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* - (x, y, z, roll, pitch, yaw) define the relative pose between these variables.
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* - "cov_6x6" is the full 6x6 covariance matrix (row-major).
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*
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* See also:
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* - GTSAM Issue #1452: https://github.com/borglab/gtsam/issues/1452
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*/
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// STL
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#include <iostream>
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#include <string>
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// GTSAM
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#include <gtsam/geometry/Pose3.h>
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#include <gtsam/nonlinear/ISAM2.h>
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#include <gtsam/nonlinear/Values.h>
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#include <gtsam/nonlinear/NonlinearFactorGraph.h>
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#include <gtsam/slam/BetweenFactor.h>
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#include <gtsam_unstable/nonlinear/IncrementalFixedLagSmoother.h>
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#include <gtsam/inference/Symbol.h>
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#include <gtsam/slam/dataset.h> // for writeG2o
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using namespace std;
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using namespace gtsam;
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// Shorthand for symbols
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using symbol_shorthand::X; // Pose3 (x,y,z, roll, pitch, yaw)
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// Factor types
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enum FactorType {
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PRIOR = 0,
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BETWEEN = 1
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};
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typedef Eigen::Matrix<double, 6, 6> Matrix6;
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/* ************************************************************************* */
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/**
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* @brief Read a 6x6 covariance matrix from an input string stream.
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*
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* @param iss Input string stream containing covariance entries.
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* @return 6x6 covariance matrix.
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*/
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Matrix6 readCovarianceMatrix(istringstream &iss) {
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Matrix6 cov;
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for (int r = 0; r < 6; ++r) {
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for (int c = 0; c < 6; ++c) {
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iss >> cov(r, c);
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}
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}
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return cov;
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}
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/* ************************************************************************* */
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/**
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* @brief Create a Pose3 object from individual pose parameters.
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*
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* @param x Translation in x
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* @param y Translation in y
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* @param z Translation in z
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* @param roll Rotation about x-axis
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* @param pitch Rotation about y-axis
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* @param yaw Rotation about z-axis
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* @return Constructed Pose3 object
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*/
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Pose3 createPose(double x, double y, double z, double roll, double pitch, double yaw) {
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return Pose3(Rot3::RzRyRx(roll, pitch, yaw), Point3(x, y, z));
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}
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/* ************************************************************************* */
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/**
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* @brief Save the factor graph and estimates to a .g2o file (for visualization/debugging).
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*
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* @param graph The factor graph
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* @param estimate Current estimates of all variables
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* @param filename Base filename for saving
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* @param iterCount Iteration count to differentiate successive outputs
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*/
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void saveG2oGraph(const NonlinearFactorGraph &graph, const Values &estimate,
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const string &filename, int iterCount) {
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// Create zero-padded iteration count
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string countStr = to_string(iterCount);
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string paddedCount = string(5 - countStr.length(), '0') + countStr;
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string fullFilename = filename + "_" + paddedCount + ".g2o";
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// Write graph and estimates to g2o file
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writeG2o(graph, estimate, fullFilename);
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cout << "\nSaved graph to: " << fullFilename << endl;
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}
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/* ************************************************************************* */
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/**
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* @brief Main function: Reads poses data from a text file and performs incremental fixed-lag smoothing.
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*
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* Data Flow:
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* 1) Parse lines from "IncrementalFixedLagSmootherTestData.txt".
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* 2) For each line:
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* - If it's a PRIOR factor, add a PriorFactor with a specified pose and covariance.
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* - If it's a BETWEEN factor, add a BetweenFactor with a relative pose and covariance.
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* - Insert new variables with initial guesses into the current solution if they don't exist.
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* 3) Update the fixed-lag smoother (with iSAM2 inside) to incrementally optimize and marginalize out old poses
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* beyond the specified lag window.
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* 4) Repeat until all lines are processed.
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* 5) Save the resulting factor graph and estimate of the last sliding window to a .g2o file.
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*/
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int main() {
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string factor_loc = findExampleDataFile("issue1452.txt");
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ifstream factor_file(factor_loc.c_str());
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cout << "Reading factors data file: " << factor_loc << endl;
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// Configure ISAM2 parameters for the fixed-lag smoother
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ISAM2Params isamParameters;
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isamParameters.relinearizeThreshold = 0.1;
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isamParameters.relinearizeSkip = 1;
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// Important!!!!!! Key parameter to ensure old factors are released after marginalization
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isamParameters.findUnusedFactorSlots = true;
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// Initialize fixed-lag smoother with a 1-second lag window
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const double lag = 1.0;
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IncrementalFixedLagSmoother smoother(lag, isamParameters);
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// Print the iSAM2 parameters (optional)
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isamParameters.print();
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// Containers for incremental updates
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NonlinearFactorGraph newFactors;
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Values newValues;
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FixedLagSmoother::KeyTimestampMap newTimestamps;
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// For tracking the latest estimate of all states in the sliding window
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Values currentEstimate;
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Pose3 lastPose;
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// Read and process each line in the factor graph file
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string line;
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int lineCount = 0;
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while (getline(factor_file, line)) {
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if (line.empty()) continue; // Skip empty lines
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cout << "\n======================== Processing line " << ++lineCount
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<< " =========================" << endl;
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istringstream iss(line);
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int factorType;
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iss >> factorType;
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// Check if the factor is PRIOR or BETWEEN
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if (factorType == PRIOR) {
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/**
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* Format: PRIOR factor
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* factor_type timestamp key pose(x y z roll pitch yaw) cov(6x6)
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*/
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double timestamp;
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int key;
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double x, y, z, roll, pitch, yaw;
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iss >> timestamp >> key >> x >> y >> z >> roll >> pitch >> yaw;
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Pose3 pose = createPose(x, y, z, roll, pitch, yaw);
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Matrix6 cov = readCovarianceMatrix(iss);
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auto noise = noiseModel::Gaussian::Covariance(cov);
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// Add prior factor
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newFactors.addPrior(X(key), pose, noise);
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cout << "Add PRIOR factor on key " << key << endl;
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// Provide initial guess if not already in the graph
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if (!newValues.exists(X(key))) {
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newValues.insert(X(key), pose);
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newTimestamps[X(key)] = timestamp;
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}
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} else if (factorType == BETWEEN) {
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/**
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* Format: BETWEEN factor
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* factor_type timestamp key1 key2 pose(x y z roll pitch yaw) cov(6x6)
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*/
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double timestamp;
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int key1, key2;
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iss >> timestamp >> key1 >> key2;
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double x1, y1, z1, roll1, pitch1, yaw1;
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iss >> x1 >> y1 >> z1 >> roll1 >> pitch1 >> yaw1;
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Pose3 relativePose = createPose(x1, y1, z1, roll1, pitch1, yaw1);
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Matrix6 cov = readCovarianceMatrix(iss);
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auto noise = noiseModel::Gaussian::Covariance(cov);
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// Add between factor
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newFactors.emplace_shared<BetweenFactor<Pose3>>(X(key1), X(key2), relativePose, noise);
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cout << "Add BETWEEN factor: " << key1 << " -> " << key2 << endl;
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// Provide an initial guess if needed
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if (!newValues.exists(X(key2))) {
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newValues.insert(X(key2), lastPose.compose(relativePose));
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newTimestamps[X(key2)] = timestamp;
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}
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} else {
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cerr << "Unknown factor type: " << factorType << endl;
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continue;
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}
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// Print some intermediate statistics
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cout << "Before update - Graph has " << smoother.getFactors().size()
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<< " factors, " << smoother.getFactors().nrFactors() << " nr factors." << endl;
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cout << "New factors: " << newFactors.size()
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<< ", New values: " << newValues.size() << endl;
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// Attempt to update the smoother with new factors and values
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try {
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smoother.update(newFactors, newValues, newTimestamps);
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// Optional: Perform extra internal iterations if needed
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size_t maxExtraIterations = 3;
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for (size_t i = 1; i < maxExtraIterations; ++i) {
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smoother.update();
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}
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// you may not get expected results if you use the gtsam version lower than 4.3
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cout << "After update - Graph has " << smoother.getFactors().size()
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<< " factors, " << smoother.getFactors().nrFactors() << " nr factors." << endl;
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// Retrieve the latest estimate
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currentEstimate = smoother.calculateEstimate();
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if (!currentEstimate.empty()) {
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// Update lastPose to the last key's estimate
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Key lastKey = currentEstimate.keys().back();
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lastPose = currentEstimate.at<Pose3>(lastKey);
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}
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// Clear containers for the next iteration
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newFactors.resize(0);
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newValues.clear();
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newTimestamps.clear();
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} catch (const exception &e) {
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cerr << "Smoother update failed: " << e.what() << endl;
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}
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}
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// The results of the last sliding window are saved to a g2o file for visualization or further analysis.
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saveG2oGraph(smoother.getFactors(), currentEstimate, "isam", lineCount);
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factor_file.close();
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return 0;
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}
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