[WIP] add debugging info why balanced cond tree fails

appveyor.yml

@@ -28,5 +28,5 @@ build:
 
 test_script:
   - cd %APPVEYOR_BUILD_FOLDER%\build
-  - ctest --output-on-failure -C %CONFIGURATION%
+  - ctest --output-on-failure -VV -C %CONFIGURATION%
   - cd ..

examples/undocumented/libshogun/balanced_conditional_probability_tree.cpp

@@ -9,6 +9,7 @@
  *
  * This example demonstrates use of the Vowpal Wabbit learning algorithm.
  */
+#include <iostream>
 
 #include <shogun/base/init.h>
 #include <shogun/lib/common.h>
@@ -23,6 +24,7 @@ int main(int argc, char **argv)
 {
 	init_shogun_with_defaults();
 
+	try {
 	const char* train_file_name = "../data/7class_example4_train.dense";
 	const char* test_file_name = "../data/7class_example4_test.dense";
 	CStreamingAsciiFile* train_file = new CStreamingAsciiFile(train_file_name);
@@ -91,8 +93,13 @@ int main(int argc, char **argv)
 	SG_UNREF(test_file);
 	SG_UNREF(cpt);
 	SG_UNREF(pred);
-
+	} catch (ShogunException& e) {
+		std::cout << "got shogun exception: " << e.get_exception_string() << std::endl;
+	} catch(...) {
+		std::cout << "unknown exception!" << std::endl;
+	}
 	exit_shogun();
 
+
 	return 0;
 }