gp_parego.hpp: fixed the failed assertion issues due to different sample and observation sizes

src/limbo/experimental/model/gp_parego.hpp

@@ -41,13 +41,18 @@ namespace limbo {
                     const Eigen::VectorXd& noises_bl = Eigen::VectorXd())
                 {
                     _raw_observations = observations;
+                    _nb_objs = observations[0].size();
                     auto new_observations = _scalarize_obs(observations);
                     Model::compute(samples, new_observations, noises, bl_samples);
                 }
                 /// add sample will NOT be incremental (we call compute each time)
                 void add_sample(const Eigen::VectorXd& sample, const Eigen::VectorXd& observation, double noise)
                 {
+                    this->_samples.push_back(sample);
+                    this->_noises.conservativeResize(this->_noises.size() + 1);
+                    this->_noises[this->_noises.size() - 1] = noise;
                     _raw_observations.push_back(observation);
+
                     this->compute(this->_samples,
                         _raw_observations, this->_noises,
                         this->_bl_samples);