LIBSVM and LIBLINEAR are two popular open source machine learning libraries, both developed at the National Taiwan University and both written in C++ though with a C API. LIBSVM implements the Sequential minimal optimization (SMO) algorithm for kernelized support vector machines (SVMs), supporting classification and regression.LIBLINEAR implements linear SVMs and logistic regression models trained using a coordinate descent algorithm. Both libraries are free software released under the 3-clause BSD license.