added an example for multiclass serialization that doesnt work (but r…

…uns fine) Once muticlass label serialization work this should be turned into a test

examples/undocumented/libshogun/Makefile

@@ -84,6 +84,7 @@ TARGETS = basic_minimal \
 		  converter_stochasticproximityembedding \
 		  converter_factoranalysis \
 		  serialization_basic_tests \
+		  serialization_multiclass_labels \
 		  kernel_machine_train_locked \
 		  statistics \
 		  transfer_multitaskleastsquaresregression \

examples/undocumented/libshogun/labels_multiclass_serialization.cpp

@@ -0,0 +1,43 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Written (W) 2013 Heiko Strathmann
+ */
+#include <shogun/labels/BinaryLabels.h>
+
+using namespace shogun;
+
+void test_sigmoid_fitting()
+{
+	CBinaryLabels* labels=new CBinaryLabels(10);
+	labels->set_values(SGVector<float64_t>(labels->get_num_labels()));
+
+	for (index_t i=0; i<labels->get_num_labels(); ++i)
+		labels->set_value(i%2==0 ? 1 : -1, i);
+
+	labels->get_values().display_vector("scores");
+	labels->scores_to_probabilities();
+
+	/* only two probabilities will be the result, repeatedly,
+	 * assert against reference implementation */
+	ASSERT(CMath::abs(labels->get_value(0)-0.8571428439385661)<10E-15);
+	ASSERT(CMath::abs(labels->get_value(1)-0.14285715606143384)<10E-15);
+
+	SG_UNREF(labels);
+}
+
+int main()
+{
+	init_shogun_with_defaults();
+
+//	sg_io->set_loglevel(MSG_DEBUG);
+
+	test_sigmoid_fitting();
+
+	exit_shogun();
+	return 0;
+}
+