Fixing some Errors in the tests.

src/helper_files/helper.hpp

src/methods/adaboost/adaboost_test.pl

src/methods/approx_kfn/approx_kfn.cpp

src/methods/approx_kfn/approx_kfn_test.pl

...bayesian_linear_regression/bayesian_linear_regression.cpp

...sian_linear_regression/bayesian_linear_regression_test.pl

src/methods/hoeffding_tree/hoeffding_tree.cpp

src/methods/hoeffding_tree/hoeffding_tree.pl

src/methods/hoeffding_tree/hoeffding_tree_test.pl

src/methods/kde/kde.cpp

src/methods/kde/kde_test.pl

src/methods/kernel_pca/kernel_pca.cpp

src/methods/kernel_pca/kernel_pca.pl

src/methods/kernel_pca/kernel_pca_test.pl

src/methods/lars/lars.cpp

test_all.pl