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diff --git a/sample_set.cc b/sample_set.cc
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+++ b/sample_set.cc
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+
+///////////////////////////////////////////////////////////////////////////
+// This program is free software: you can redistribute it and/or modify  //
+// it under the terms of the version 3 of the GNU General Public License //
+// as published by the Free Software Foundation.                         //
+//                                                                       //
+// This program is distributed in the hope that it will be useful, but   //
+// WITHOUT ANY WARRANTY; without even the implied warranty of            //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      //
+// General Public License for more details.                              //
+//                                                                       //
+// You should have received a copy of the GNU General Public License     //
+// along with this program. If not, see <http://www.gnu.org/licenses/>.  //
+//                                                                       //
+// Written by Francois Fleuret, (C) IDIAP                                //
+// Contact <francois.fleuret@idiap.ch> for comments & bug reports        //
+///////////////////////////////////////////////////////////////////////////
+
+#include "sample_set.h"
+
+SampleSet::SampleSet(int nb_features, int nb_samples) {
+  _nb_features = nb_features;
+  _nb_samples = nb_samples;
+  _shared_feature_values = new SharedResponses(_nb_features, _nb_samples);
+  _shared_feature_values->grab();
+
+  _labels = new int[_nb_samples];
+  _feature_values = new scalar_t *[_nb_samples];
+  for(int s = 0; s < _nb_samples; s++)
+    _feature_values[s] = _shared_feature_values->_responses + _nb_features * s;
+
+}
+
+SampleSet::SampleSet(SampleSet *father, int nb, int *indexes) {
+  _nb_features = father->_nb_features;
+  _nb_samples = nb;
+  _shared_feature_values = father->_shared_feature_values;
+  _shared_feature_values->grab();
+
+  _labels = new int[_nb_samples];
+  _feature_values = new scalar_t *[_nb_samples];
+  for(int s = 0; s < _nb_samples; s++) {
+    _feature_values[s] = father->_feature_values[indexes[s]];
+    _labels[s] = father->_labels[indexes[s]];
+  }
+}
+
+SampleSet::~SampleSet() {
+  _shared_feature_values->release();
+  delete[] _feature_values;
+  delete[] _labels;
+}
+
+void SampleSet::set_sample(int n,
+                           PiFeatureFamily *pi_feature_family,
+                           RichImage *image,
+                           PoseCell *cell, int label) {
+  ASSERT(n >= 0 && n < _nb_samples);
+  _labels[n] = label;
+  PiReferential referential(cell);
+  for(int f = 0; f < _nb_features; f++) {
+    _feature_values[n][f] = pi_feature_family->get_feature(f)->response(image, &referential);
+    ASSERT(!isnan(_feature_values[n][f]));
+  }
+}